box2d.js

// Name: Box2D Physics
// ID: griffpatch
// Description: Two dimensional physics.
// Original: griffpatch <https://scratch.mit.edu/users/griffpatch/>
// License: BSD-3-Clause AND MIT AND Zlib

/*!
 * This is based on https://github.com/griffpatch/scratch-vm/tree/box2d/src/extensions/scratch3_griffpatch
 * by griffpatch, which has this license attached:
 *
 * Copyright (c) 2016, Massachusetts Institute of Technology
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

(function (Scratch) {
  "use strict";

  if (!Scratch.extensions.unsandboxed) {
    throw new Error("Box2D must be run unsandboxed");
  }

  // First we need to load the Box2D physics library that this extension uses.
  // Scratch.external needs the library to have an established external presence that isn't going away but this
  // library is very old and seems to be abandoned. We might have to give it a home ourselves.

  /* eslint-disable */

  /*!
   * Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
   *
   * This software is provided 'as-is', without any express or implied
   * warranty.  In no event will the authors be held liable for any damages
   * arising from the use of this software.
   * Permission is granted to anyone to use this software for any purpose,
   * including commercial applications, and to alter it and redistribute it
   * freely, subject to the following restrictions:
   * 1. The origin of this software must not be misrepresented; you must not
   * claim that you wrote the original software. If you use this software
   * in a product, an acknowledgment in the product documentation would be
   * appreciated but is not required.
   * 2. Altered source versions must be plainly marked as such, and must not be
   * misrepresented as being the original software.
   * 3. This notice may not be removed or altered from any source distribution.
   */

  var Box2D = {};
  (function (a2j, undefined) {
    function emptyFn() {}
    a2j.inherit = function (cls, base) {
      var tmpCtr = cls;
      emptyFn.prototype = base.prototype;
      cls.prototype = new emptyFn();
      cls.prototype.constructor = tmpCtr;
    };

    a2j.generateCallback = function generateCallback(context, cb) {
      return function () {
        cb.apply(context, arguments);
      };
    };

    a2j.NVector = function NVector(length) {
      if (length === undefined) length = 0;
      var tmp = new Array(length || 0);
      for (var i = 0; i < length; ++i) tmp[i] = 0;
      return tmp;
    };

    a2j.is = function is(o1, o2) {
      if (o1 === null) return false;
      if (o2 instanceof Function && o1 instanceof o2) return true;
      if (
        o1.constructor.__implements != undefined &&
        o1.constructor.__implements[o2]
      )
        return true;
      return false;
    };

    a2j.parseUInt = function (v) {
      return Math.abs(parseInt(v));
    };
  })(Box2D);

  //#TODO remove assignments from global namespace
  var Vector = Array;
  var Vector_a2j_Number = Box2D.NVector;
  //package structure
  if (typeof Box2D === "undefined") Box2D = {};
  if (typeof Box2D.Collision === "undefined") Box2D.Collision = {};
  if (typeof Box2D.Collision.Shapes === "undefined")
    Box2D.Collision.Shapes = {};
  if (typeof Box2D.Common === "undefined") Box2D.Common = {};
  if (typeof Box2D.Common.Math === "undefined") Box2D.Common.Math = {};
  if (typeof Box2D.Dynamics === "undefined") Box2D.Dynamics = {};
  if (typeof Box2D.Dynamics.Contacts === "undefined")
    Box2D.Dynamics.Contacts = {};
  if (typeof Box2D.Dynamics.Controllers === "undefined")
    Box2D.Dynamics.Controllers = {};
  if (typeof Box2D.Dynamics.Joints === "undefined") Box2D.Dynamics.Joints = {};
  //pre-definitions
  (function () {
    Box2D.Collision.IBroadPhase = "Box2D.Collision.IBroadPhase";

    function b2AABB() {
      b2AABB.b2AABB.apply(this, arguments);
    }
    Box2D.Collision.b2AABB = b2AABB;

    function b2Bound() {
      b2Bound.b2Bound.apply(this, arguments);
    }
    Box2D.Collision.b2Bound = b2Bound;

    function b2BoundValues() {
      b2BoundValues.b2BoundValues.apply(this, arguments);
      if (this.constructor === b2BoundValues)
        this.b2BoundValues.apply(this, arguments);
    }
    Box2D.Collision.b2BoundValues = b2BoundValues;

    function b2Collision() {
      b2Collision.b2Collision.apply(this, arguments);
    }
    Box2D.Collision.b2Collision = b2Collision;

    function b2ContactID() {
      b2ContactID.b2ContactID.apply(this, arguments);
      if (this.constructor === b2ContactID)
        this.b2ContactID.apply(this, arguments);
    }
    Box2D.Collision.b2ContactID = b2ContactID;

    function b2ContactPoint() {
      b2ContactPoint.b2ContactPoint.apply(this, arguments);
    }
    Box2D.Collision.b2ContactPoint = b2ContactPoint;

    function b2Distance() {
      b2Distance.b2Distance.apply(this, arguments);
    }
    Box2D.Collision.b2Distance = b2Distance;

    function b2DistanceInput() {
      b2DistanceInput.b2DistanceInput.apply(this, arguments);
    }
    Box2D.Collision.b2DistanceInput = b2DistanceInput;

    function b2DistanceOutput() {
      b2DistanceOutput.b2DistanceOutput.apply(this, arguments);
    }
    Box2D.Collision.b2DistanceOutput = b2DistanceOutput;

    function b2DistanceProxy() {
      b2DistanceProxy.b2DistanceProxy.apply(this, arguments);
    }
    Box2D.Collision.b2DistanceProxy = b2DistanceProxy;

    function b2DynamicTree() {
      b2DynamicTree.b2DynamicTree.apply(this, arguments);
      if (this.constructor === b2DynamicTree)
        this.b2DynamicTree.apply(this, arguments);
    }
    Box2D.Collision.b2DynamicTree = b2DynamicTree;

    function b2DynamicTreeBroadPhase() {
      b2DynamicTreeBroadPhase.b2DynamicTreeBroadPhase.apply(this, arguments);
    }
    Box2D.Collision.b2DynamicTreeBroadPhase = b2DynamicTreeBroadPhase;

    function b2DynamicTreeNode() {
      b2DynamicTreeNode.b2DynamicTreeNode.apply(this, arguments);
    }
    Box2D.Collision.b2DynamicTreeNode = b2DynamicTreeNode;

    function b2DynamicTreePair() {
      b2DynamicTreePair.b2DynamicTreePair.apply(this, arguments);
    }
    Box2D.Collision.b2DynamicTreePair = b2DynamicTreePair;

    function b2Manifold() {
      b2Manifold.b2Manifold.apply(this, arguments);
      if (this.constructor === b2Manifold)
        this.b2Manifold.apply(this, arguments);
    }
    Box2D.Collision.b2Manifold = b2Manifold;

    function b2ManifoldPoint() {
      b2ManifoldPoint.b2ManifoldPoint.apply(this, arguments);
      if (this.constructor === b2ManifoldPoint)
        this.b2ManifoldPoint.apply(this, arguments);
    }
    Box2D.Collision.b2ManifoldPoint = b2ManifoldPoint;

    function b2Point() {
      b2Point.b2Point.apply(this, arguments);
    }
    Box2D.Collision.b2Point = b2Point;

    function b2RayCastInput() {
      b2RayCastInput.b2RayCastInput.apply(this, arguments);
      if (this.constructor === b2RayCastInput)
        this.b2RayCastInput.apply(this, arguments);
    }
    Box2D.Collision.b2RayCastInput = b2RayCastInput;

    function b2RayCastOutput() {
      b2RayCastOutput.b2RayCastOutput.apply(this, arguments);
    }
    Box2D.Collision.b2RayCastOutput = b2RayCastOutput;

    function b2Segment() {
      b2Segment.b2Segment.apply(this, arguments);
    }
    Box2D.Collision.b2Segment = b2Segment;

    function b2SeparationFunction() {
      b2SeparationFunction.b2SeparationFunction.apply(this, arguments);
    }
    Box2D.Collision.b2SeparationFunction = b2SeparationFunction;

    function b2Simplex() {
      b2Simplex.b2Simplex.apply(this, arguments);
      if (this.constructor === b2Simplex) this.b2Simplex.apply(this, arguments);
    }
    Box2D.Collision.b2Simplex = b2Simplex;

    function b2SimplexCache() {
      b2SimplexCache.b2SimplexCache.apply(this, arguments);
    }
    Box2D.Collision.b2SimplexCache = b2SimplexCache;

    function b2SimplexVertex() {
      b2SimplexVertex.b2SimplexVertex.apply(this, arguments);
    }
    Box2D.Collision.b2SimplexVertex = b2SimplexVertex;

    function b2TimeOfImpact() {
      b2TimeOfImpact.b2TimeOfImpact.apply(this, arguments);
    }
    Box2D.Collision.b2TimeOfImpact = b2TimeOfImpact;

    function b2TOIInput() {
      b2TOIInput.b2TOIInput.apply(this, arguments);
    }
    Box2D.Collision.b2TOIInput = b2TOIInput;

    function b2WorldManifold() {
      b2WorldManifold.b2WorldManifold.apply(this, arguments);
      if (this.constructor === b2WorldManifold)
        this.b2WorldManifold.apply(this, arguments);
    }
    Box2D.Collision.b2WorldManifold = b2WorldManifold;

    function ClipVertex() {
      ClipVertex.ClipVertex.apply(this, arguments);
    }
    Box2D.Collision.ClipVertex = ClipVertex;

    function Features() {
      Features.Features.apply(this, arguments);
    }
    Box2D.Collision.Features = Features;

    function b2CircleShape() {
      b2CircleShape.b2CircleShape.apply(this, arguments);
      if (this.constructor === b2CircleShape)
        this.b2CircleShape.apply(this, arguments);
    }
    Box2D.Collision.Shapes.b2CircleShape = b2CircleShape;

    function b2EdgeChainDef() {
      b2EdgeChainDef.b2EdgeChainDef.apply(this, arguments);
      if (this.constructor === b2EdgeChainDef)
        this.b2EdgeChainDef.apply(this, arguments);
    }
    Box2D.Collision.Shapes.b2EdgeChainDef = b2EdgeChainDef;

    function b2EdgeShape() {
      b2EdgeShape.b2EdgeShape.apply(this, arguments);
      if (this.constructor === b2EdgeShape)
        this.b2EdgeShape.apply(this, arguments);
    }
    Box2D.Collision.Shapes.b2EdgeShape = b2EdgeShape;

    function b2MassData() {
      b2MassData.b2MassData.apply(this, arguments);
    }
    Box2D.Collision.Shapes.b2MassData = b2MassData;

    function b2PolygonShape() {
      b2PolygonShape.b2PolygonShape.apply(this, arguments);
      if (this.constructor === b2PolygonShape)
        this.b2PolygonShape.apply(this, arguments);
    }
    Box2D.Collision.Shapes.b2PolygonShape = b2PolygonShape;

    function b2Shape() {
      b2Shape.b2Shape.apply(this, arguments);
      if (this.constructor === b2Shape) this.b2Shape.apply(this, arguments);
    }
    Box2D.Collision.Shapes.b2Shape = b2Shape;
    Box2D.Common.b2internal = "Box2D.Common.b2internal";

    function b2Color() {
      b2Color.b2Color.apply(this, arguments);
      if (this.constructor === b2Color) this.b2Color.apply(this, arguments);
    }
    Box2D.Common.b2Color = b2Color;

    function b2Settings() {
      b2Settings.b2Settings.apply(this, arguments);
    }
    Box2D.Common.b2Settings = b2Settings;

    function b2Mat22() {
      b2Mat22.b2Mat22.apply(this, arguments);
      if (this.constructor === b2Mat22) this.b2Mat22.apply(this, arguments);
    }
    Box2D.Common.Math.b2Mat22 = b2Mat22;

    function b2Mat33() {
      b2Mat33.b2Mat33.apply(this, arguments);
      if (this.constructor === b2Mat33) this.b2Mat33.apply(this, arguments);
    }
    Box2D.Common.Math.b2Mat33 = b2Mat33;

    function b2Math() {
      b2Math.b2Math.apply(this, arguments);
    }
    Box2D.Common.Math.b2Math = b2Math;

    function b2Sweep() {
      b2Sweep.b2Sweep.apply(this, arguments);
    }
    Box2D.Common.Math.b2Sweep = b2Sweep;

    function b2Transform() {
      b2Transform.b2Transform.apply(this, arguments);
      if (this.constructor === b2Transform)
        this.b2Transform.apply(this, arguments);
    }
    Box2D.Common.Math.b2Transform = b2Transform;

    function b2Vec2() {
      b2Vec2.b2Vec2.apply(this, arguments);
      if (this.constructor === b2Vec2) this.b2Vec2.apply(this, arguments);
    }
    Box2D.Common.Math.b2Vec2 = b2Vec2;

    function b2Vec3() {
      b2Vec3.b2Vec3.apply(this, arguments);
      if (this.constructor === b2Vec3) this.b2Vec3.apply(this, arguments);
    }
    Box2D.Common.Math.b2Vec3 = b2Vec3;

    function b2Body() {
      b2Body.b2Body.apply(this, arguments);
      if (this.constructor === b2Body) this.b2Body.apply(this, arguments);
    }
    Box2D.Dynamics.b2Body = b2Body;

    function b2BodyDef() {
      b2BodyDef.b2BodyDef.apply(this, arguments);
      if (this.constructor === b2BodyDef) this.b2BodyDef.apply(this, arguments);
    }
    Box2D.Dynamics.b2BodyDef = b2BodyDef;

    function b2ContactFilter() {
      b2ContactFilter.b2ContactFilter.apply(this, arguments);
    }
    Box2D.Dynamics.b2ContactFilter = b2ContactFilter;

    function b2ContactImpulse() {
      b2ContactImpulse.b2ContactImpulse.apply(this, arguments);
    }
    Box2D.Dynamics.b2ContactImpulse = b2ContactImpulse;

    function b2ContactListener() {
      b2ContactListener.b2ContactListener.apply(this, arguments);
    }
    Box2D.Dynamics.b2ContactListener = b2ContactListener;

    function b2ContactManager() {
      b2ContactManager.b2ContactManager.apply(this, arguments);
      if (this.constructor === b2ContactManager)
        this.b2ContactManager.apply(this, arguments);
    }
    Box2D.Dynamics.b2ContactManager = b2ContactManager;

    function b2DebugDraw() {
      b2DebugDraw.b2DebugDraw.apply(this, arguments);
      if (this.constructor === b2DebugDraw)
        this.b2DebugDraw.apply(this, arguments);
    }
    Box2D.Dynamics.b2DebugDraw = b2DebugDraw;

    function b2DestructionListener() {
      b2DestructionListener.b2DestructionListener.apply(this, arguments);
    }
    Box2D.Dynamics.b2DestructionListener = b2DestructionListener;

    function b2FilterData() {
      b2FilterData.b2FilterData.apply(this, arguments);
    }
    Box2D.Dynamics.b2FilterData = b2FilterData;

    function b2Fixture() {
      b2Fixture.b2Fixture.apply(this, arguments);
      if (this.constructor === b2Fixture) this.b2Fixture.apply(this, arguments);
    }
    Box2D.Dynamics.b2Fixture = b2Fixture;

    function b2FixtureDef() {
      b2FixtureDef.b2FixtureDef.apply(this, arguments);
      if (this.constructor === b2FixtureDef)
        this.b2FixtureDef.apply(this, arguments);
    }
    Box2D.Dynamics.b2FixtureDef = b2FixtureDef;

    function b2Island() {
      b2Island.b2Island.apply(this, arguments);
      if (this.constructor === b2Island) this.b2Island.apply(this, arguments);
    }
    Box2D.Dynamics.b2Island = b2Island;

    function b2TimeStep() {
      b2TimeStep.b2TimeStep.apply(this, arguments);
    }
    Box2D.Dynamics.b2TimeStep = b2TimeStep;

    function b2World() {
      b2World.b2World.apply(this, arguments);
      if (this.constructor === b2World) this.b2World.apply(this, arguments);
    }
    Box2D.Dynamics.b2World = b2World;

    function b2CircleContact() {
      b2CircleContact.b2CircleContact.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2CircleContact = b2CircleContact;

    function b2Contact() {
      b2Contact.b2Contact.apply(this, arguments);
      if (this.constructor === b2Contact) this.b2Contact.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2Contact = b2Contact;

    function b2ContactConstraint() {
      b2ContactConstraint.b2ContactConstraint.apply(this, arguments);
      if (this.constructor === b2ContactConstraint)
        this.b2ContactConstraint.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2ContactConstraint = b2ContactConstraint;

    function b2ContactConstraintPoint() {
      b2ContactConstraintPoint.b2ContactConstraintPoint.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2ContactConstraintPoint = b2ContactConstraintPoint;

    function b2ContactEdge() {
      b2ContactEdge.b2ContactEdge.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2ContactEdge = b2ContactEdge;

    function b2ContactFactory() {
      b2ContactFactory.b2ContactFactory.apply(this, arguments);
      if (this.constructor === b2ContactFactory)
        this.b2ContactFactory.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2ContactFactory = b2ContactFactory;

    function b2ContactRegister() {
      b2ContactRegister.b2ContactRegister.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2ContactRegister = b2ContactRegister;

    function b2ContactResult() {
      b2ContactResult.b2ContactResult.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2ContactResult = b2ContactResult;

    function b2ContactSolver() {
      b2ContactSolver.b2ContactSolver.apply(this, arguments);
      if (this.constructor === b2ContactSolver)
        this.b2ContactSolver.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2ContactSolver = b2ContactSolver;

    function b2EdgeAndCircleContact() {
      b2EdgeAndCircleContact.b2EdgeAndCircleContact.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2EdgeAndCircleContact = b2EdgeAndCircleContact;

    function b2NullContact() {
      b2NullContact.b2NullContact.apply(this, arguments);
      if (this.constructor === b2NullContact)
        this.b2NullContact.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2NullContact = b2NullContact;

    function b2PolyAndCircleContact() {
      b2PolyAndCircleContact.b2PolyAndCircleContact.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2PolyAndCircleContact = b2PolyAndCircleContact;

    function b2PolyAndEdgeContact() {
      b2PolyAndEdgeContact.b2PolyAndEdgeContact.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2PolyAndEdgeContact = b2PolyAndEdgeContact;

    function b2PolygonContact() {
      b2PolygonContact.b2PolygonContact.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2PolygonContact = b2PolygonContact;

    function b2PositionSolverManifold() {
      b2PositionSolverManifold.b2PositionSolverManifold.apply(this, arguments);
      if (this.constructor === b2PositionSolverManifold)
        this.b2PositionSolverManifold.apply(this, arguments);
    }
    Box2D.Dynamics.Contacts.b2PositionSolverManifold = b2PositionSolverManifold;

    function b2BuoyancyController() {
      b2BuoyancyController.b2BuoyancyController.apply(this, arguments);
    }
    Box2D.Dynamics.Controllers.b2BuoyancyController = b2BuoyancyController;

    function b2ConstantAccelController() {
      b2ConstantAccelController.b2ConstantAccelController.apply(
        this,
        arguments
      );
    }
    Box2D.Dynamics.Controllers.b2ConstantAccelController =
      b2ConstantAccelController;

    function b2ConstantForceController() {
      b2ConstantForceController.b2ConstantForceController.apply(
        this,
        arguments
      );
    }
    Box2D.Dynamics.Controllers.b2ConstantForceController =
      b2ConstantForceController;

    function b2Controller() {
      b2Controller.b2Controller.apply(this, arguments);
    }
    Box2D.Dynamics.Controllers.b2Controller = b2Controller;

    function b2ControllerEdge() {
      b2ControllerEdge.b2ControllerEdge.apply(this, arguments);
    }
    Box2D.Dynamics.Controllers.b2ControllerEdge = b2ControllerEdge;

    function b2GravityController() {
      b2GravityController.b2GravityController.apply(this, arguments);
    }
    Box2D.Dynamics.Controllers.b2GravityController = b2GravityController;

    function b2TensorDampingController() {
      b2TensorDampingController.b2TensorDampingController.apply(
        this,
        arguments
      );
    }
    Box2D.Dynamics.Controllers.b2TensorDampingController =
      b2TensorDampingController;

    function b2DistanceJoint() {
      b2DistanceJoint.b2DistanceJoint.apply(this, arguments);
      if (this.constructor === b2DistanceJoint)
        this.b2DistanceJoint.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2DistanceJoint = b2DistanceJoint;

    function b2DistanceJointDef() {
      b2DistanceJointDef.b2DistanceJointDef.apply(this, arguments);
      if (this.constructor === b2DistanceJointDef)
        this.b2DistanceJointDef.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2DistanceJointDef = b2DistanceJointDef;

    function b2FrictionJoint() {
      b2FrictionJoint.b2FrictionJoint.apply(this, arguments);
      if (this.constructor === b2FrictionJoint)
        this.b2FrictionJoint.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2FrictionJoint = b2FrictionJoint;

    function b2FrictionJointDef() {
      b2FrictionJointDef.b2FrictionJointDef.apply(this, arguments);
      if (this.constructor === b2FrictionJointDef)
        this.b2FrictionJointDef.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2FrictionJointDef = b2FrictionJointDef;

    function b2GearJoint() {
      b2GearJoint.b2GearJoint.apply(this, arguments);
      if (this.constructor === b2GearJoint)
        this.b2GearJoint.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2GearJoint = b2GearJoint;

    function b2GearJointDef() {
      b2GearJointDef.b2GearJointDef.apply(this, arguments);
      if (this.constructor === b2GearJointDef)
        this.b2GearJointDef.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2GearJointDef = b2GearJointDef;

    function b2Jacobian() {
      b2Jacobian.b2Jacobian.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2Jacobian = b2Jacobian;

    function b2Joint() {
      b2Joint.b2Joint.apply(this, arguments);
      if (this.constructor === b2Joint) this.b2Joint.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2Joint = b2Joint;

    function b2JointDef() {
      b2JointDef.b2JointDef.apply(this, arguments);
      if (this.constructor === b2JointDef)
        this.b2JointDef.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2JointDef = b2JointDef;

    function b2JointEdge() {
      b2JointEdge.b2JointEdge.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2JointEdge = b2JointEdge;

    function b2LineJoint() {
      b2LineJoint.b2LineJoint.apply(this, arguments);
      if (this.constructor === b2LineJoint)
        this.b2LineJoint.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2LineJoint = b2LineJoint;

    function b2LineJointDef() {
      b2LineJointDef.b2LineJointDef.apply(this, arguments);
      if (this.constructor === b2LineJointDef)
        this.b2LineJointDef.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2LineJointDef = b2LineJointDef;

    function b2MouseJoint() {
      b2MouseJoint.b2MouseJoint.apply(this, arguments);
      if (this.constructor === b2MouseJoint)
        this.b2MouseJoint.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2MouseJoint = b2MouseJoint;

    function b2MouseJointDef() {
      b2MouseJointDef.b2MouseJointDef.apply(this, arguments);
      if (this.constructor === b2MouseJointDef)
        this.b2MouseJointDef.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2MouseJointDef = b2MouseJointDef;

    function b2PrismaticJoint() {
      b2PrismaticJoint.b2PrismaticJoint.apply(this, arguments);
      if (this.constructor === b2PrismaticJoint)
        this.b2PrismaticJoint.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2PrismaticJoint = b2PrismaticJoint;

    function b2PrismaticJointDef() {
      b2PrismaticJointDef.b2PrismaticJointDef.apply(this, arguments);
      if (this.constructor === b2PrismaticJointDef)
        this.b2PrismaticJointDef.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2PrismaticJointDef = b2PrismaticJointDef;

    function b2PulleyJoint() {
      b2PulleyJoint.b2PulleyJoint.apply(this, arguments);
      if (this.constructor === b2PulleyJoint)
        this.b2PulleyJoint.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2PulleyJoint = b2PulleyJoint;

    function b2PulleyJointDef() {
      b2PulleyJointDef.b2PulleyJointDef.apply(this, arguments);
      if (this.constructor === b2PulleyJointDef)
        this.b2PulleyJointDef.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2PulleyJointDef = b2PulleyJointDef;

    function b2RevoluteJoint() {
      b2RevoluteJoint.b2RevoluteJoint.apply(this, arguments);
      if (this.constructor === b2RevoluteJoint)
        this.b2RevoluteJoint.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2RevoluteJoint = b2RevoluteJoint;

    function b2RevoluteJointDef() {
      b2RevoluteJointDef.b2RevoluteJointDef.apply(this, arguments);
      if (this.constructor === b2RevoluteJointDef)
        this.b2RevoluteJointDef.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2RevoluteJointDef = b2RevoluteJointDef;

    function b2WeldJoint() {
      b2WeldJoint.b2WeldJoint.apply(this, arguments);
      if (this.constructor === b2WeldJoint)
        this.b2WeldJoint.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2WeldJoint = b2WeldJoint;

    function b2WeldJointDef() {
      b2WeldJointDef.b2WeldJointDef.apply(this, arguments);
      if (this.constructor === b2WeldJointDef)
        this.b2WeldJointDef.apply(this, arguments);
    }
    Box2D.Dynamics.Joints.b2WeldJointDef = b2WeldJointDef;
  })(); //definitions
  Box2D.postDefs = [];
  (function () {
    var b2CircleShape = Box2D.Collision.Shapes.b2CircleShape,
      b2EdgeChainDef = Box2D.Collision.Shapes.b2EdgeChainDef,
      b2EdgeShape = Box2D.Collision.Shapes.b2EdgeShape,
      b2MassData = Box2D.Collision.Shapes.b2MassData,
      b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape,
      b2Shape = Box2D.Collision.Shapes.b2Shape,
      b2Color = Box2D.Common.b2Color,
      b2internal = Box2D.Common.b2internal,
      b2Settings = Box2D.Common.b2Settings,
      b2Mat22 = Box2D.Common.Math.b2Mat22,
      b2Mat33 = Box2D.Common.Math.b2Mat33,
      b2Math = Box2D.Common.Math.b2Math,
      b2Sweep = Box2D.Common.Math.b2Sweep,
      b2Transform = Box2D.Common.Math.b2Transform,
      b2Vec2 = Box2D.Common.Math.b2Vec2,
      b2Vec3 = Box2D.Common.Math.b2Vec3,
      b2AABB = Box2D.Collision.b2AABB,
      b2Bound = Box2D.Collision.b2Bound,
      b2BoundValues = Box2D.Collision.b2BoundValues,
      b2Collision = Box2D.Collision.b2Collision,
      b2ContactID = Box2D.Collision.b2ContactID,
      b2ContactPoint = Box2D.Collision.b2ContactPoint,
      b2Distance = Box2D.Collision.b2Distance,
      b2DistanceInput = Box2D.Collision.b2DistanceInput,
      b2DistanceOutput = Box2D.Collision.b2DistanceOutput,
      b2DistanceProxy = Box2D.Collision.b2DistanceProxy,
      b2DynamicTree = Box2D.Collision.b2DynamicTree,
      b2DynamicTreeBroadPhase = Box2D.Collision.b2DynamicTreeBroadPhase,
      b2DynamicTreeNode = Box2D.Collision.b2DynamicTreeNode,
      b2DynamicTreePair = Box2D.Collision.b2DynamicTreePair,
      b2Manifold = Box2D.Collision.b2Manifold,
      b2ManifoldPoint = Box2D.Collision.b2ManifoldPoint,
      b2Point = Box2D.Collision.b2Point,
      b2RayCastInput = Box2D.Collision.b2RayCastInput,
      b2RayCastOutput = Box2D.Collision.b2RayCastOutput,
      b2Segment = Box2D.Collision.b2Segment,
      b2SeparationFunction = Box2D.Collision.b2SeparationFunction,
      b2Simplex = Box2D.Collision.b2Simplex,
      b2SimplexCache = Box2D.Collision.b2SimplexCache,
      b2SimplexVertex = Box2D.Collision.b2SimplexVertex,
      b2TimeOfImpact = Box2D.Collision.b2TimeOfImpact,
      b2TOIInput = Box2D.Collision.b2TOIInput,
      b2WorldManifold = Box2D.Collision.b2WorldManifold,
      ClipVertex = Box2D.Collision.ClipVertex,
      Features = Box2D.Collision.Features,
      IBroadPhase = Box2D.Collision.IBroadPhase;

    b2AABB.b2AABB = function () {
      this.lowerBound = new b2Vec2();
      this.upperBound = new b2Vec2();
    };
    b2AABB.prototype.IsValid = function () {
      var dX = this.upperBound.x - this.lowerBound.x;
      var dY = this.upperBound.y - this.lowerBound.y;
      var valid = dX >= 0.0 && dY >= 0.0;
      valid = valid && this.lowerBound.IsValid() && this.upperBound.IsValid();
      return valid;
    };
    b2AABB.prototype.GetCenter = function () {
      return new b2Vec2(
        (this.lowerBound.x + this.upperBound.x) / 2,
        (this.lowerBound.y + this.upperBound.y) / 2
      );
    };
    b2AABB.prototype.GetExtents = function () {
      return new b2Vec2(
        (this.upperBound.x - this.lowerBound.x) / 2,
        (this.upperBound.y - this.lowerBound.y) / 2
      );
    };
    b2AABB.prototype.Contains = function (aabb) {
      var result = true;
      result = result && this.lowerBound.x <= aabb.lowerBound.x;
      result = result && this.lowerBound.y <= aabb.lowerBound.y;
      result = result && aabb.upperBound.x <= this.upperBound.x;
      result = result && aabb.upperBound.y <= this.upperBound.y;
      return result;
    };
    b2AABB.prototype.RayCast = function (output, input) {
      var tmin = -Number.MAX_VALUE;
      var tmax = Number.MAX_VALUE;
      var pX = input.p1.x;
      var pY = input.p1.y;
      var dX = input.p2.x - input.p1.x;
      var dY = input.p2.y - input.p1.y;
      var absDX = Math.abs(dX);
      var absDY = Math.abs(dY);
      var normal = output.normal;
      var inv_d = 0;
      var t1 = 0;
      var t2 = 0;
      var t3 = 0;
      var s = 0;
      {
        if (absDX < Number.MIN_VALUE) {
          if (pX < this.lowerBound.x || this.upperBound.x < pX) return false;
        } else {
          inv_d = 1.0 / dX;
          t1 = (this.lowerBound.x - pX) * inv_d;
          t2 = (this.upperBound.x - pX) * inv_d;
          s = -1.0;
          if (t1 > t2) {
            t3 = t1;
            t1 = t2;
            t2 = t3;
            s = 1.0;
          }
          if (t1 > tmin) {
            normal.x = s;
            normal.y = 0;
            tmin = t1;
          }
          tmax = Math.min(tmax, t2);
          if (tmin > tmax) return false;
        }
      }
      {
        if (absDY < Number.MIN_VALUE) {
          if (pY < this.lowerBound.y || this.upperBound.y < pY) return false;
        } else {
          inv_d = 1.0 / dY;
          t1 = (this.lowerBound.y - pY) * inv_d;
          t2 = (this.upperBound.y - pY) * inv_d;
          s = -1.0;
          if (t1 > t2) {
            t3 = t1;
            t1 = t2;
            t2 = t3;
            s = 1.0;
          }
          if (t1 > tmin) {
            normal.y = s;
            normal.x = 0;
            tmin = t1;
          }
          tmax = Math.min(tmax, t2);
          if (tmin > tmax) return false;
        }
      }
      output.fraction = tmin;
      return true;
    };
    b2AABB.prototype.TestOverlap = function (other) {
      var d1X = other.lowerBound.x - this.upperBound.x;
      var d1Y = other.lowerBound.y - this.upperBound.y;
      var d2X = this.lowerBound.x - other.upperBound.x;
      var d2Y = this.lowerBound.y - other.upperBound.y;
      if (d1X > 0.0 || d1Y > 0.0) return false;
      if (d2X > 0.0 || d2Y > 0.0) return false;
      return true;
    };
    b2AABB.Combine = function (aabb1, aabb2) {
      var aabb = new b2AABB();
      aabb.Combine(aabb1, aabb2);
      return aabb;
    };
    b2AABB.prototype.Combine = function (aabb1, aabb2) {
      this.lowerBound.x = Math.min(aabb1.lowerBound.x, aabb2.lowerBound.x);
      this.lowerBound.y = Math.min(aabb1.lowerBound.y, aabb2.lowerBound.y);
      this.upperBound.x = Math.max(aabb1.upperBound.x, aabb2.upperBound.x);
      this.upperBound.y = Math.max(aabb1.upperBound.y, aabb2.upperBound.y);
    };
    b2Bound.b2Bound = function () {};
    b2Bound.prototype.IsLower = function () {
      return (this.value & 1) == 0;
    };
    b2Bound.prototype.IsUpper = function () {
      return (this.value & 1) == 1;
    };
    b2Bound.prototype.Swap = function (b) {
      var tempValue = this.value;
      var tempProxy = this.proxy;
      var tempStabbingCount = this.stabbingCount;
      this.value = b.value;
      this.proxy = b.proxy;
      this.stabbingCount = b.stabbingCount;
      b.value = tempValue;
      b.proxy = tempProxy;
      b.stabbingCount = tempStabbingCount;
    };
    b2BoundValues.b2BoundValues = function () {};
    b2BoundValues.prototype.b2BoundValues = function () {
      this.lowerValues = new Vector_a2j_Number();
      this.lowerValues[0] = 0.0;
      this.lowerValues[1] = 0.0;
      this.upperValues = new Vector_a2j_Number();
      this.upperValues[0] = 0.0;
      this.upperValues[1] = 0.0;
    };
    b2Collision.b2Collision = function () {};
    b2Collision.ClipSegmentToLine = function (vOut, vIn, normal, offset) {
      if (offset === undefined) offset = 0;
      var cv;
      var numOut = 0;
      cv = vIn[0];
      var vIn0 = cv.v;
      cv = vIn[1];
      var vIn1 = cv.v;
      var distance0 = normal.x * vIn0.x + normal.y * vIn0.y - offset;
      var distance1 = normal.x * vIn1.x + normal.y * vIn1.y - offset;
      if (distance0 <= 0.0) vOut[numOut++].Set(vIn[0]);
      if (distance1 <= 0.0) vOut[numOut++].Set(vIn[1]);
      if (distance0 * distance1 < 0.0) {
        var interp = distance0 / (distance0 - distance1);
        cv = vOut[numOut];
        var tVec = cv.v;
        tVec.x = vIn0.x + interp * (vIn1.x - vIn0.x);
        tVec.y = vIn0.y + interp * (vIn1.y - vIn0.y);
        cv = vOut[numOut];
        var cv2;
        if (distance0 > 0.0) {
          cv2 = vIn[0];
          cv.id = cv2.id;
        } else {
          cv2 = vIn[1];
          cv.id = cv2.id;
        }
        ++numOut;
      }
      return numOut;
    };
    b2Collision.EdgeSeparation = function (poly1, xf1, edge1, poly2, xf2) {
      if (edge1 === undefined) edge1 = 0;
      var count1 = parseInt(poly1.m_vertexCount);
      var vertices1 = poly1.m_vertices;
      var normals1 = poly1.m_normals;
      var count2 = parseInt(poly2.m_vertexCount);
      var vertices2 = poly2.m_vertices;
      var tMat;
      var tVec;
      tMat = xf1.R;
      tVec = normals1[edge1];
      var normal1WorldX = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
      var normal1WorldY = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
      tMat = xf2.R;
      var normal1X = tMat.col1.x * normal1WorldX + tMat.col1.y * normal1WorldY;
      var normal1Y = tMat.col2.x * normal1WorldX + tMat.col2.y * normal1WorldY;
      var index = 0;
      var minDot = Number.MAX_VALUE;
      for (var i = 0; i < count2; ++i) {
        tVec = vertices2[i];
        var dot = tVec.x * normal1X + tVec.y * normal1Y;
        if (dot < minDot) {
          minDot = dot;
          index = i;
        }
      }
      tVec = vertices1[edge1];
      tMat = xf1.R;
      var v1X = xf1.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      var v1Y = xf1.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      tVec = vertices2[index];
      tMat = xf2.R;
      var v2X = xf2.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      var v2Y = xf2.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      v2X -= v1X;
      v2Y -= v1Y;
      var separation = v2X * normal1WorldX + v2Y * normal1WorldY;
      return separation;
    };
    b2Collision.FindMaxSeparation = function (
      edgeIndex,
      poly1,
      xf1,
      poly2,
      xf2
    ) {
      var count1 = parseInt(poly1.m_vertexCount);
      var normals1 = poly1.m_normals;
      var tVec;
      var tMat;
      tMat = xf2.R;
      tVec = poly2.m_centroid;
      var dX = xf2.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      var dY = xf2.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      tMat = xf1.R;
      tVec = poly1.m_centroid;
      dX -= xf1.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      dY -= xf1.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      var dLocal1X = dX * xf1.R.col1.x + dY * xf1.R.col1.y;
      var dLocal1Y = dX * xf1.R.col2.x + dY * xf1.R.col2.y;
      var edge = 0;
      var maxDot = -Number.MAX_VALUE;
      for (var i = 0; i < count1; ++i) {
        tVec = normals1[i];
        var dot = tVec.x * dLocal1X + tVec.y * dLocal1Y;
        if (dot > maxDot) {
          maxDot = dot;
          edge = i;
        }
      }
      var s = b2Collision.EdgeSeparation(poly1, xf1, edge, poly2, xf2);
      var prevEdge = parseInt(edge - 1 >= 0 ? edge - 1 : count1 - 1);
      var sPrev = b2Collision.EdgeSeparation(poly1, xf1, prevEdge, poly2, xf2);
      var nextEdge = parseInt(edge + 1 < count1 ? edge + 1 : 0);
      var sNext = b2Collision.EdgeSeparation(poly1, xf1, nextEdge, poly2, xf2);
      var bestEdge = 0;
      var bestSeparation = 0;
      var increment = 0;
      if (sPrev > s && sPrev > sNext) {
        increment = -1;
        bestEdge = prevEdge;
        bestSeparation = sPrev;
      } else if (sNext > s) {
        increment = 1;
        bestEdge = nextEdge;
        bestSeparation = sNext;
      } else {
        edgeIndex[0] = edge;
        return s;
      }
      while (true) {
        if (increment == -1)
          edge = bestEdge - 1 >= 0 ? bestEdge - 1 : count1 - 1;
        else edge = bestEdge + 1 < count1 ? bestEdge + 1 : 0;
        s = b2Collision.EdgeSeparation(poly1, xf1, edge, poly2, xf2);
        if (s > bestSeparation) {
          bestEdge = edge;
          bestSeparation = s;
        } else {
          break;
        }
      }
      edgeIndex[0] = bestEdge;
      return bestSeparation;
    };
    b2Collision.FindIncidentEdge = function (c, poly1, xf1, edge1, poly2, xf2) {
      if (edge1 === undefined) edge1 = 0;
      var count1 = parseInt(poly1.m_vertexCount);
      var normals1 = poly1.m_normals;
      var count2 = parseInt(poly2.m_vertexCount);
      var vertices2 = poly2.m_vertices;
      var normals2 = poly2.m_normals;
      var tMat;
      var tVec;
      tMat = xf1.R;
      tVec = normals1[edge1];
      var normal1X = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
      var normal1Y = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
      tMat = xf2.R;
      var tX = tMat.col1.x * normal1X + tMat.col1.y * normal1Y;
      normal1Y = tMat.col2.x * normal1X + tMat.col2.y * normal1Y;
      normal1X = tX;
      var index = 0;
      var minDot = Number.MAX_VALUE;
      for (var i = 0; i < count2; ++i) {
        tVec = normals2[i];
        var dot = normal1X * tVec.x + normal1Y * tVec.y;
        if (dot < minDot) {
          minDot = dot;
          index = i;
        }
      }
      var tClip;
      var i1 = parseInt(index);
      var i2 = parseInt(i1 + 1 < count2 ? i1 + 1 : 0);
      tClip = c[0];
      tVec = vertices2[i1];
      tMat = xf2.R;
      tClip.v.x =
        xf2.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      tClip.v.y =
        xf2.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      tClip.id.features.referenceEdge = edge1;
      tClip.id.features.incidentEdge = i1;
      tClip.id.features.incidentVertex = 0;
      tClip = c[1];
      tVec = vertices2[i2];
      tMat = xf2.R;
      tClip.v.x =
        xf2.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      tClip.v.y =
        xf2.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      tClip.id.features.referenceEdge = edge1;
      tClip.id.features.incidentEdge = i2;
      tClip.id.features.incidentVertex = 1;
    };
    b2Collision.MakeClipPointVector = function () {
      var r = new Vector(2);
      r[0] = new ClipVertex();
      r[1] = new ClipVertex();
      return r;
    };
    b2Collision.CollidePolygons = function (manifold, polyA, xfA, polyB, xfB) {
      var cv;
      manifold.m_pointCount = 0;
      var totalRadius = polyA.m_radius + polyB.m_radius;
      var edgeA = 0;
      b2Collision.s_edgeAO[0] = edgeA;
      var separationA = b2Collision.FindMaxSeparation(
        b2Collision.s_edgeAO,
        polyA,
        xfA,
        polyB,
        xfB
      );
      edgeA = b2Collision.s_edgeAO[0];
      if (separationA > totalRadius) return;
      var edgeB = 0;
      b2Collision.s_edgeBO[0] = edgeB;
      var separationB = b2Collision.FindMaxSeparation(
        b2Collision.s_edgeBO,
        polyB,
        xfB,
        polyA,
        xfA
      );
      edgeB = b2Collision.s_edgeBO[0];
      if (separationB > totalRadius) return;
      var poly1;
      var poly2;
      var xf1;
      var xf2;
      var edge1 = 0;
      var flip = 0;
      var k_relativeTol = 0.98;
      var k_absoluteTol = 0.001;
      var tMat;
      if (separationB > k_relativeTol * separationA + k_absoluteTol) {
        poly1 = polyB;
        poly2 = polyA;
        xf1 = xfB;
        xf2 = xfA;
        edge1 = edgeB;
        manifold.m_type = b2Manifold.e_faceB;
        flip = 1;
      } else {
        poly1 = polyA;
        poly2 = polyB;
        xf1 = xfA;
        xf2 = xfB;
        edge1 = edgeA;
        manifold.m_type = b2Manifold.e_faceA;
        flip = 0;
      }
      var incidentEdge = b2Collision.s_incidentEdge;
      b2Collision.FindIncidentEdge(incidentEdge, poly1, xf1, edge1, poly2, xf2);
      var count1 = parseInt(poly1.m_vertexCount);
      var vertices1 = poly1.m_vertices;
      var local_v11 = vertices1[edge1];
      var local_v12;
      if (edge1 + 1 < count1) {
        local_v12 = vertices1[parseInt(edge1 + 1)];
      } else {
        local_v12 = vertices1[0];
      }
      var localTangent = b2Collision.s_localTangent;
      localTangent.Set(local_v12.x - local_v11.x, local_v12.y - local_v11.y);
      localTangent.Normalize();
      var localNormal = b2Collision.s_localNormal;
      localNormal.x = localTangent.y;
      localNormal.y = -localTangent.x;
      var planePoint = b2Collision.s_planePoint;
      planePoint.Set(
        0.5 * (local_v11.x + local_v12.x),
        0.5 * (local_v11.y + local_v12.y)
      );
      var tangent = b2Collision.s_tangent;
      tMat = xf1.R;
      tangent.x = tMat.col1.x * localTangent.x + tMat.col2.x * localTangent.y;
      tangent.y = tMat.col1.y * localTangent.x + tMat.col2.y * localTangent.y;
      var tangent2 = b2Collision.s_tangent2;
      tangent2.x = -tangent.x;
      tangent2.y = -tangent.y;
      var normal = b2Collision.s_normal;
      normal.x = tangent.y;
      normal.y = -tangent.x;
      var v11 = b2Collision.s_v11;
      var v12 = b2Collision.s_v12;
      v11.x =
        xf1.position.x +
        (tMat.col1.x * local_v11.x + tMat.col2.x * local_v11.y);
      v11.y =
        xf1.position.y +
        (tMat.col1.y * local_v11.x + tMat.col2.y * local_v11.y);
      v12.x =
        xf1.position.x +
        (tMat.col1.x * local_v12.x + tMat.col2.x * local_v12.y);
      v12.y =
        xf1.position.y +
        (tMat.col1.y * local_v12.x + tMat.col2.y * local_v12.y);
      var frontOffset = normal.x * v11.x + normal.y * v11.y;
      var sideOffset1 = -tangent.x * v11.x - tangent.y * v11.y + totalRadius;
      var sideOffset2 = tangent.x * v12.x + tangent.y * v12.y + totalRadius;
      var clipPoints1 = b2Collision.s_clipPoints1;
      var clipPoints2 = b2Collision.s_clipPoints2;
      var np = 0;
      np = b2Collision.ClipSegmentToLine(
        clipPoints1,
        incidentEdge,
        tangent2,
        sideOffset1
      );
      if (np < 2) return;
      np = b2Collision.ClipSegmentToLine(
        clipPoints2,
        clipPoints1,
        tangent,
        sideOffset2
      );
      if (np < 2) return;
      manifold.m_localPlaneNormal.SetV(localNormal);
      manifold.m_localPoint.SetV(planePoint);
      var pointCount = 0;
      for (var i = 0; i < b2Settings.b2_maxManifoldPoints; ++i) {
        cv = clipPoints2[i];
        var separation = normal.x * cv.v.x + normal.y * cv.v.y - frontOffset;
        if (separation <= totalRadius) {
          var cp = manifold.m_points[pointCount];
          tMat = xf2.R;
          var tX = cv.v.x - xf2.position.x;
          var tY = cv.v.y - xf2.position.y;
          cp.m_localPoint.x = tX * tMat.col1.x + tY * tMat.col1.y;
          cp.m_localPoint.y = tX * tMat.col2.x + tY * tMat.col2.y;
          cp.m_id.Set(cv.id);
          cp.m_id.features.flip = flip;
          ++pointCount;
        }
      }
      manifold.m_pointCount = pointCount;
    };
    b2Collision.CollideCircles = function (
      manifold,
      circle1,
      xf1,
      circle2,
      xf2
    ) {
      manifold.m_pointCount = 0;
      var tMat;
      var tVec;
      tMat = xf1.R;
      tVec = circle1.m_p;
      var p1X = xf1.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      var p1Y = xf1.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      tMat = xf2.R;
      tVec = circle2.m_p;
      var p2X = xf2.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      var p2Y = xf2.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      var dX = p2X - p1X;
      var dY = p2Y - p1Y;
      var distSqr = dX * dX + dY * dY;
      var radius = circle1.m_radius + circle2.m_radius;
      if (distSqr > radius * radius) {
        return;
      }
      manifold.m_type = b2Manifold.e_circles;
      manifold.m_localPoint.SetV(circle1.m_p);
      manifold.m_localPlaneNormal.SetZero();
      manifold.m_pointCount = 1;
      manifold.m_points[0].m_localPoint.SetV(circle2.m_p);
      manifold.m_points[0].m_id.key = 0;
    };
    b2Collision.CollidePolygonAndCircle = function (
      manifold,
      polygon,
      xf1,
      circle,
      xf2
    ) {
      manifold.m_pointCount = 0;
      var tPoint;
      var dX = 0;
      var dY = 0;
      var positionX = 0;
      var positionY = 0;
      var tVec;
      var tMat;
      tMat = xf2.R;
      tVec = circle.m_p;
      var cX = xf2.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      var cY = xf2.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      dX = cX - xf1.position.x;
      dY = cY - xf1.position.y;
      tMat = xf1.R;
      var cLocalX = dX * tMat.col1.x + dY * tMat.col1.y;
      var cLocalY = dX * tMat.col2.x + dY * tMat.col2.y;
      var dist = 0;
      var normalIndex = 0;
      var separation = -Number.MAX_VALUE;
      var radius = polygon.m_radius + circle.m_radius;
      var vertexCount = parseInt(polygon.m_vertexCount);
      var vertices = polygon.m_vertices;
      var normals = polygon.m_normals;
      for (var i = 0; i < vertexCount; ++i) {
        tVec = vertices[i];
        dX = cLocalX - tVec.x;
        dY = cLocalY - tVec.y;
        tVec = normals[i];
        var s = tVec.x * dX + tVec.y * dY;
        if (s > radius) {
          return;
        }
        if (s > separation) {
          separation = s;
          normalIndex = i;
        }
      }
      var vertIndex1 = parseInt(normalIndex);
      var vertIndex2 = parseInt(
        vertIndex1 + 1 < vertexCount ? vertIndex1 + 1 : 0
      );
      var v1 = vertices[vertIndex1];
      var v2 = vertices[vertIndex2];
      if (separation < Number.MIN_VALUE) {
        manifold.m_pointCount = 1;
        manifold.m_type = b2Manifold.e_faceA;
        manifold.m_localPlaneNormal.SetV(normals[normalIndex]);
        manifold.m_localPoint.x = 0.5 * (v1.x + v2.x);
        manifold.m_localPoint.y = 0.5 * (v1.y + v2.y);
        manifold.m_points[0].m_localPoint.SetV(circle.m_p);
        manifold.m_points[0].m_id.key = 0;
        return;
      }
      var u1 =
        (cLocalX - v1.x) * (v2.x - v1.x) + (cLocalY - v1.y) * (v2.y - v1.y);
      var u2 =
        (cLocalX - v2.x) * (v1.x - v2.x) + (cLocalY - v2.y) * (v1.y - v2.y);
      if (u1 <= 0.0) {
        if (
          (cLocalX - v1.x) * (cLocalX - v1.x) +
            (cLocalY - v1.y) * (cLocalY - v1.y) >
          radius * radius
        )
          return;
        manifold.m_pointCount = 1;
        manifold.m_type = b2Manifold.e_faceA;
        manifold.m_localPlaneNormal.x = cLocalX - v1.x;
        manifold.m_localPlaneNormal.y = cLocalY - v1.y;
        manifold.m_localPlaneNormal.Normalize();
        manifold.m_localPoint.SetV(v1);
        manifold.m_points[0].m_localPoint.SetV(circle.m_p);
        manifold.m_points[0].m_id.key = 0;
      } else if (u2 <= 0) {
        if (
          (cLocalX - v2.x) * (cLocalX - v2.x) +
            (cLocalY - v2.y) * (cLocalY - v2.y) >
          radius * radius
        )
          return;
        manifold.m_pointCount = 1;
        manifold.m_type = b2Manifold.e_faceA;
        manifold.m_localPlaneNormal.x = cLocalX - v2.x;
        manifold.m_localPlaneNormal.y = cLocalY - v2.y;
        manifold.m_localPlaneNormal.Normalize();
        manifold.m_localPoint.SetV(v2);
        manifold.m_points[0].m_localPoint.SetV(circle.m_p);
        manifold.m_points[0].m_id.key = 0;
      } else {
        var faceCenterX = 0.5 * (v1.x + v2.x);
        var faceCenterY = 0.5 * (v1.y + v2.y);
        separation =
          (cLocalX - faceCenterX) * normals[vertIndex1].x +
          (cLocalY - faceCenterY) * normals[vertIndex1].y;
        if (separation > radius) return;
        manifold.m_pointCount = 1;
        manifold.m_type = b2Manifold.e_faceA;
        manifold.m_localPlaneNormal.x = normals[vertIndex1].x;
        manifold.m_localPlaneNormal.y = normals[vertIndex1].y;
        manifold.m_localPlaneNormal.Normalize();
        manifold.m_localPoint.Set(faceCenterX, faceCenterY);
        manifold.m_points[0].m_localPoint.SetV(circle.m_p);
        manifold.m_points[0].m_id.key = 0;
      }
    };
    b2Collision.TestOverlap = function (a, b) {
      var t1 = b.lowerBound;
      var t2 = a.upperBound;
      var d1X = t1.x - t2.x;
      var d1Y = t1.y - t2.y;
      t1 = a.lowerBound;
      t2 = b.upperBound;
      var d2X = t1.x - t2.x;
      var d2Y = t1.y - t2.y;
      if (d1X > 0.0 || d1Y > 0.0) return false;
      if (d2X > 0.0 || d2Y > 0.0) return false;
      return true;
    };
    Box2D.postDefs.push(function () {
      Box2D.Collision.b2Collision.s_incidentEdge =
        b2Collision.MakeClipPointVector();
      Box2D.Collision.b2Collision.s_clipPoints1 =
        b2Collision.MakeClipPointVector();
      Box2D.Collision.b2Collision.s_clipPoints2 =
        b2Collision.MakeClipPointVector();
      Box2D.Collision.b2Collision.s_edgeAO = new Vector_a2j_Number(1);
      Box2D.Collision.b2Collision.s_edgeBO = new Vector_a2j_Number(1);
      Box2D.Collision.b2Collision.s_localTangent = new b2Vec2();
      Box2D.Collision.b2Collision.s_localNormal = new b2Vec2();
      Box2D.Collision.b2Collision.s_planePoint = new b2Vec2();
      Box2D.Collision.b2Collision.s_normal = new b2Vec2();
      Box2D.Collision.b2Collision.s_tangent = new b2Vec2();
      Box2D.Collision.b2Collision.s_tangent2 = new b2Vec2();
      Box2D.Collision.b2Collision.s_v11 = new b2Vec2();
      Box2D.Collision.b2Collision.s_v12 = new b2Vec2();
      Box2D.Collision.b2Collision.b2CollidePolyTempVec = new b2Vec2();
      Box2D.Collision.b2Collision.b2_nullFeature = 0x000000ff;
    });
    b2ContactID.b2ContactID = function () {
      this.features = new Features();
    };
    b2ContactID.prototype.b2ContactID = function () {
      this.features._m_id = this;
    };
    b2ContactID.prototype.Set = function (id) {
      this.key = id._key;
    };
    b2ContactID.prototype.Copy = function () {
      var id = new b2ContactID();
      id.key = this.key;
      return id;
    };
    Object.defineProperty(b2ContactID.prototype, "key", {
      enumerable: false,
      configurable: true,
      get: function () {
        return this._key;
      },
    });
    Object.defineProperty(b2ContactID.prototype, "key", {
      enumerable: false,
      configurable: true,
      set: function (value) {
        if (value === undefined) value = 0;
        this._key = value;
        this.features._referenceEdge = this._key & 0x000000ff;
        this.features._incidentEdge =
          ((this._key & 0x0000ff00) >> 8) & 0x000000ff;
        this.features._incidentVertex =
          ((this._key & 0x00ff0000) >> 16) & 0x000000ff;
        this.features._flip = ((this._key & 0xff000000) >> 24) & 0x000000ff;
      },
    });
    b2ContactPoint.b2ContactPoint = function () {
      this.position = new b2Vec2();
      this.velocity = new b2Vec2();
      this.normal = new b2Vec2();
      this.id = new b2ContactID();
    };
    b2Distance.b2Distance = function () {};
    b2Distance.Distance = function (output, cache, input) {
      ++b2Distance.b2_gjkCalls;
      var proxyA = input.proxyA;
      var proxyB = input.proxyB;
      var transformA = input.transformA;
      var transformB = input.transformB;
      var simplex = b2Distance.s_simplex;
      simplex.ReadCache(cache, proxyA, transformA, proxyB, transformB);
      var vertices = simplex.m_vertices;
      var k_maxIters = 20;
      var saveA = b2Distance.s_saveA;
      var saveB = b2Distance.s_saveB;
      var saveCount = 0;
      var closestPoint = simplex.GetClosestPoint();
      var distanceSqr1 = closestPoint.LengthSquared();
      var distanceSqr2 = distanceSqr1;
      var i = 0;
      var p;
      var iter = 0;
      while (iter < k_maxIters) {
        saveCount = simplex.m_count;
        for (i = 0; i < saveCount; i++) {
          saveA[i] = vertices[i].indexA;
          saveB[i] = vertices[i].indexB;
        }
        switch (simplex.m_count) {
          case 1:
            break;
          case 2:
            simplex.Solve2();
            break;
          case 3:
            simplex.Solve3();
            break;
          default:
            b2Settings.b2Assert(false);
        }
        if (simplex.m_count == 3) {
          break;
        }
        p = simplex.GetClosestPoint();
        distanceSqr2 = p.LengthSquared();
        if (distanceSqr2 > distanceSqr1) {
        }
        distanceSqr1 = distanceSqr2;
        var d = simplex.GetSearchDirection();
        if (d.LengthSquared() < Number.MIN_VALUE * Number.MIN_VALUE) {
          break;
        }
        var vertex = vertices[simplex.m_count];
        vertex.indexA = proxyA.GetSupport(
          b2Math.MulTMV(transformA.R, d.GetNegative())
        );
        vertex.wA = b2Math.MulX(transformA, proxyA.GetVertex(vertex.indexA));
        vertex.indexB = proxyB.GetSupport(b2Math.MulTMV(transformB.R, d));
        vertex.wB = b2Math.MulX(transformB, proxyB.GetVertex(vertex.indexB));
        vertex.w = b2Math.SubtractVV(vertex.wB, vertex.wA);
        ++iter;
        ++b2Distance.b2_gjkIters;
        var duplicate = false;
        for (i = 0; i < saveCount; i++) {
          if (vertex.indexA == saveA[i] && vertex.indexB == saveB[i]) {
            duplicate = true;
            break;
          }
        }
        if (duplicate) {
          break;
        }
        ++simplex.m_count;
      }
      b2Distance.b2_gjkMaxIters = b2Math.Max(b2Distance.b2_gjkMaxIters, iter);
      simplex.GetWitnessPoints(output.pointA, output.pointB);
      output.distance = b2Math
        .SubtractVV(output.pointA, output.pointB)
        .Length();
      output.iterations = iter;
      simplex.WriteCache(cache);
      if (input.useRadii) {
        var rA = proxyA.m_radius;
        var rB = proxyB.m_radius;
        if (output.distance > rA + rB && output.distance > Number.MIN_VALUE) {
          output.distance -= rA + rB;
          var normal = b2Math.SubtractVV(output.pointB, output.pointA);
          normal.Normalize();
          output.pointA.x += rA * normal.x;
          output.pointA.y += rA * normal.y;
          output.pointB.x -= rB * normal.x;
          output.pointB.y -= rB * normal.y;
        } else {
          p = new b2Vec2();
          p.x = 0.5 * (output.pointA.x + output.pointB.x);
          p.y = 0.5 * (output.pointA.y + output.pointB.y);
          output.pointA.x = output.pointB.x = p.x;
          output.pointA.y = output.pointB.y = p.y;
          output.distance = 0.0;
        }
      }
    };
    Box2D.postDefs.push(function () {
      Box2D.Collision.b2Distance.s_simplex = new b2Simplex();
      Box2D.Collision.b2Distance.s_saveA = new Vector_a2j_Number(3);
      Box2D.Collision.b2Distance.s_saveB = new Vector_a2j_Number(3);
    });
    b2DistanceInput.b2DistanceInput = function () {};
    b2DistanceOutput.b2DistanceOutput = function () {
      this.pointA = new b2Vec2();
      this.pointB = new b2Vec2();
    };
    b2DistanceProxy.b2DistanceProxy = function () {};
    b2DistanceProxy.prototype.Set = function (shape) {
      switch (shape.GetType()) {
        case b2Shape.e_circleShape:
          {
            var circle = shape instanceof b2CircleShape ? shape : null;
            this.m_vertices = new Vector(1, true);
            this.m_vertices[0] = circle.m_p;
            this.m_count = 1;
            this.m_radius = circle.m_radius;
          }
          break;
        case b2Shape.e_polygonShape:
          {
            var polygon = shape instanceof b2PolygonShape ? shape : null;
            this.m_vertices = polygon.m_vertices;
            this.m_count = polygon.m_vertexCount;
            this.m_radius = polygon.m_radius;
          }
          break;
        default:
          b2Settings.b2Assert(false);
      }
    };
    b2DistanceProxy.prototype.GetSupport = function (d) {
      var bestIndex = 0;
      var bestValue = this.m_vertices[0].x * d.x + this.m_vertices[0].y * d.y;
      for (var i = 1; i < this.m_count; ++i) {
        var value = this.m_vertices[i].x * d.x + this.m_vertices[i].y * d.y;
        if (value > bestValue) {
          bestIndex = i;
          bestValue = value;
        }
      }
      return bestIndex;
    };
    b2DistanceProxy.prototype.GetSupportVertex = function (d) {
      var bestIndex = 0;
      var bestValue = this.m_vertices[0].x * d.x + this.m_vertices[0].y * d.y;
      for (var i = 1; i < this.m_count; ++i) {
        var value = this.m_vertices[i].x * d.x + this.m_vertices[i].y * d.y;
        if (value > bestValue) {
          bestIndex = i;
          bestValue = value;
        }
      }
      return this.m_vertices[bestIndex];
    };
    b2DistanceProxy.prototype.GetVertexCount = function () {
      return this.m_count;
    };
    b2DistanceProxy.prototype.GetVertex = function (index) {
      if (index === undefined) index = 0;
      b2Settings.b2Assert(0 <= index && index < this.m_count);
      return this.m_vertices[index];
    };
    b2DynamicTree.b2DynamicTree = function () {};
    b2DynamicTree.prototype.b2DynamicTree = function () {
      this.m_root = null;
      this.m_freeList = null;
      this.m_path = 0;
      this.m_insertionCount = 0;
    };
    b2DynamicTree.prototype.CreateProxy = function (aabb, userData) {
      var node = this.AllocateNode();
      var extendX = b2Settings.b2_aabbExtension;
      var extendY = b2Settings.b2_aabbExtension;
      node.aabb.lowerBound.x = aabb.lowerBound.x - extendX;
      node.aabb.lowerBound.y = aabb.lowerBound.y - extendY;
      node.aabb.upperBound.x = aabb.upperBound.x + extendX;
      node.aabb.upperBound.y = aabb.upperBound.y + extendY;
      node.userData = userData;
      this.InsertLeaf(node);
      return node;
    };
    b2DynamicTree.prototype.DestroyProxy = function (proxy) {
      this.RemoveLeaf(proxy);
      this.FreeNode(proxy);
    };
    b2DynamicTree.prototype.MoveProxy = function (proxy, aabb, displacement) {
      b2Settings.b2Assert(proxy.IsLeaf());
      if (proxy.aabb.Contains(aabb)) {
        return false;
      }
      this.RemoveLeaf(proxy);
      var extendX =
        b2Settings.b2_aabbExtension +
        b2Settings.b2_aabbMultiplier *
          (displacement.x > 0 ? displacement.x : -displacement.x);
      var extendY =
        b2Settings.b2_aabbExtension +
        b2Settings.b2_aabbMultiplier *
          (displacement.y > 0 ? displacement.y : -displacement.y);
      proxy.aabb.lowerBound.x = aabb.lowerBound.x - extendX;
      proxy.aabb.lowerBound.y = aabb.lowerBound.y - extendY;
      proxy.aabb.upperBound.x = aabb.upperBound.x + extendX;
      proxy.aabb.upperBound.y = aabb.upperBound.y + extendY;
      this.InsertLeaf(proxy);
      return true;
    };
    b2DynamicTree.prototype.Rebalance = function (iterations) {
      if (iterations === undefined) iterations = 0;
      if (this.m_root == null) return;
      for (var i = 0; i < iterations; i++) {
        var node = this.m_root;
        var bit = 0;
        while (node.IsLeaf() == false) {
          node = (this.m_path >> bit) & 1 ? node.child2 : node.child1;
          bit = (bit + 1) & 31;
        }
        ++this.m_path;
        this.RemoveLeaf(node);
        this.InsertLeaf(node);
      }
    };
    b2DynamicTree.prototype.GetFatAABB = function (proxy) {
      return proxy.aabb;
    };
    b2DynamicTree.prototype.GetUserData = function (proxy) {
      return proxy.userData;
    };
    b2DynamicTree.prototype.Query = function (callback, aabb) {
      if (this.m_root == null) return;
      var stack = new Vector();
      var count = 0;
      stack[count++] = this.m_root;
      while (count > 0) {
        var node = stack[--count];
        if (node.aabb.TestOverlap(aabb)) {
          if (node.IsLeaf()) {
            var proceed = callback(node);
            if (!proceed) return;
          } else {
            stack[count++] = node.child1;
            stack[count++] = node.child2;
          }
        }
      }
    };
    b2DynamicTree.prototype.RayCast = function (callback, input) {
      if (this.m_root == null) return;
      var p1 = input.p1;
      var p2 = input.p2;
      var r = b2Math.SubtractVV(p1, p2);
      r.Normalize();
      var v = b2Math.CrossFV(1.0, r);
      var abs_v = b2Math.AbsV(v);
      var maxFraction = input.maxFraction;
      var segmentAABB = new b2AABB();
      var tX = 0;
      var tY = 0;
      {
        tX = p1.x + maxFraction * (p2.x - p1.x);
        tY = p1.y + maxFraction * (p2.y - p1.y);
        segmentAABB.lowerBound.x = Math.min(p1.x, tX);
        segmentAABB.lowerBound.y = Math.min(p1.y, tY);
        segmentAABB.upperBound.x = Math.max(p1.x, tX);
        segmentAABB.upperBound.y = Math.max(p1.y, tY);
      }
      var stack = new Vector();
      var count = 0;
      stack[count++] = this.m_root;
      while (count > 0) {
        var node = stack[--count];
        if (node.aabb.TestOverlap(segmentAABB) == false) {
          continue;
        }
        var c = node.aabb.GetCenter();
        var h = node.aabb.GetExtents();
        var separation =
          Math.abs(v.x * (p1.x - c.x) + v.y * (p1.y - c.y)) -
          abs_v.x * h.x -
          abs_v.y * h.y;
        if (separation > 0.0) continue;
        if (node.IsLeaf()) {
          var subInput = new b2RayCastInput();
          subInput.p1 = input.p1;
          subInput.p2 = input.p2;
          subInput.maxFraction = input.maxFraction;
          maxFraction = callback(subInput, node);
          if (maxFraction == 0.0) return;
          if (maxFraction > 0.0) {
            tX = p1.x + maxFraction * (p2.x - p1.x);
            tY = p1.y + maxFraction * (p2.y - p1.y);
            segmentAABB.lowerBound.x = Math.min(p1.x, tX);
            segmentAABB.lowerBound.y = Math.min(p1.y, tY);
            segmentAABB.upperBound.x = Math.max(p1.x, tX);
            segmentAABB.upperBound.y = Math.max(p1.y, tY);
          }
        } else {
          stack[count++] = node.child1;
          stack[count++] = node.child2;
        }
      }
    };
    b2DynamicTree.prototype.AllocateNode = function () {
      if (this.m_freeList) {
        var node = this.m_freeList;
        this.m_freeList = node.parent;
        node.parent = null;
        node.child1 = null;
        node.child2 = null;
        return node;
      }
      return new b2DynamicTreeNode();
    };
    b2DynamicTree.prototype.FreeNode = function (node) {
      node.parent = this.m_freeList;
      this.m_freeList = node;
    };
    b2DynamicTree.prototype.InsertLeaf = function (leaf) {
      ++this.m_insertionCount;
      if (this.m_root == null) {
        this.m_root = leaf;
        this.m_root.parent = null;
        return;
      }
      var center = leaf.aabb.GetCenter();
      var sibling = this.m_root;
      if (sibling.IsLeaf() == false) {
        do {
          var child1 = sibling.child1;
          var child2 = sibling.child2;
          var norm1 =
            Math.abs(
              (child1.aabb.lowerBound.x + child1.aabb.upperBound.x) / 2 -
                center.x
            ) +
            Math.abs(
              (child1.aabb.lowerBound.y + child1.aabb.upperBound.y) / 2 -
                center.y
            );
          var norm2 =
            Math.abs(
              (child2.aabb.lowerBound.x + child2.aabb.upperBound.x) / 2 -
                center.x
            ) +
            Math.abs(
              (child2.aabb.lowerBound.y + child2.aabb.upperBound.y) / 2 -
                center.y
            );
          if (norm1 < norm2) {
            sibling = child1;
          } else {
            sibling = child2;
          }
        } while (sibling.IsLeaf() == false);
      }
      var node1 = sibling.parent;
      var node2 = this.AllocateNode();
      node2.parent = node1;
      node2.userData = null;
      node2.aabb.Combine(leaf.aabb, sibling.aabb);
      if (node1) {
        if (sibling.parent.child1 == sibling) {
          node1.child1 = node2;
        } else {
          node1.child2 = node2;
        }
        node2.child1 = sibling;
        node2.child2 = leaf;
        sibling.parent = node2;
        leaf.parent = node2;
        do {
          if (node1.aabb.Contains(node2.aabb)) break;
          node1.aabb.Combine(node1.child1.aabb, node1.child2.aabb);
          node2 = node1;
          node1 = node1.parent;
        } while (node1);
      } else {
        node2.child1 = sibling;
        node2.child2 = leaf;
        sibling.parent = node2;
        leaf.parent = node2;
        this.m_root = node2;
      }
    };
    b2DynamicTree.prototype.RemoveLeaf = function (leaf) {
      if (leaf == this.m_root) {
        this.m_root = null;
        return;
      }
      var node2 = leaf.parent;
      var node1 = node2.parent;
      var sibling;
      if (node2.child1 == leaf) {
        sibling = node2.child2;
      } else {
        sibling = node2.child1;
      }
      if (node1) {
        if (node1.child1 == node2) {
          node1.child1 = sibling;
        } else {
          node1.child2 = sibling;
        }
        sibling.parent = node1;
        this.FreeNode(node2);
        while (node1) {
          var oldAABB = node1.aabb;
          node1.aabb = b2AABB.Combine(node1.child1.aabb, node1.child2.aabb);
          if (oldAABB.Contains(node1.aabb)) break;
          node1 = node1.parent;
        }
      } else {
        this.m_root = sibling;
        sibling.parent = null;
        this.FreeNode(node2);
      }
    };
    b2DynamicTreeBroadPhase.b2DynamicTreeBroadPhase = function () {
      this.m_tree = new b2DynamicTree();
      this.m_moveBuffer = new Vector();
      this.m_pairBuffer = new Vector();
      this.m_pairCount = 0;
    };
    b2DynamicTreeBroadPhase.prototype.CreateProxy = function (aabb, userData) {
      var proxy = this.m_tree.CreateProxy(aabb, userData);
      ++this.m_proxyCount;
      this.BufferMove(proxy);
      return proxy;
    };
    b2DynamicTreeBroadPhase.prototype.DestroyProxy = function (proxy) {
      this.UnBufferMove(proxy);
      --this.m_proxyCount;
      this.m_tree.DestroyProxy(proxy);
    };
    b2DynamicTreeBroadPhase.prototype.MoveProxy = function (
      proxy,
      aabb,
      displacement
    ) {
      var buffer = this.m_tree.MoveProxy(proxy, aabb, displacement);
      if (buffer) {
        this.BufferMove(proxy);
      }
    };
    b2DynamicTreeBroadPhase.prototype.TestOverlap = function (proxyA, proxyB) {
      var aabbA = this.m_tree.GetFatAABB(proxyA);
      var aabbB = this.m_tree.GetFatAABB(proxyB);
      return aabbA.TestOverlap(aabbB);
    };
    b2DynamicTreeBroadPhase.prototype.GetUserData = function (proxy) {
      return this.m_tree.GetUserData(proxy);
    };
    b2DynamicTreeBroadPhase.prototype.GetFatAABB = function (proxy) {
      return this.m_tree.GetFatAABB(proxy);
    };
    b2DynamicTreeBroadPhase.prototype.GetProxyCount = function () {
      return this.m_proxyCount;
    };
    b2DynamicTreeBroadPhase.prototype.UpdatePairs = function (callback) {
      var __this = this;
      __this.m_pairCount = 0;
      var i = 0,
        queryProxy;
      function QueryCallback(proxy) {
        if (proxy == queryProxy) return true;
        if (__this.m_pairCount == __this.m_pairBuffer.length) {
          __this.m_pairBuffer[__this.m_pairCount] = new b2DynamicTreePair();
        }
        var pair = __this.m_pairBuffer[__this.m_pairCount];
        pair.proxyA = proxy < queryProxy ? proxy : queryProxy;
        pair.proxyB = proxy >= queryProxy ? proxy : queryProxy;
        ++__this.m_pairCount;
        return true;
      }
      for (i = 0; i < __this.m_moveBuffer.length; ++i) {
        queryProxy = __this.m_moveBuffer[i];
        var fatAABB = __this.m_tree.GetFatAABB(queryProxy);
        __this.m_tree.Query(QueryCallback, fatAABB);
      }
      __this.m_moveBuffer.length = 0;
      for (var i = 0; i < __this.m_pairCount; ) {
        var primaryPair = __this.m_pairBuffer[i];
        var userDataA = __this.m_tree.GetUserData(primaryPair.proxyA);
        var userDataB = __this.m_tree.GetUserData(primaryPair.proxyB);
        callback(userDataA, userDataB);
        ++i;
        while (i < __this.m_pairCount) {
          var pair = __this.m_pairBuffer[i];
          if (
            pair.proxyA != primaryPair.proxyA ||
            pair.proxyB != primaryPair.proxyB
          ) {
            break;
          }
          ++i;
        }
      }
    };
    b2DynamicTreeBroadPhase.prototype.Query = function (callback, aabb) {
      this.m_tree.Query(callback, aabb);
    };
    b2DynamicTreeBroadPhase.prototype.RayCast = function (callback, input) {
      this.m_tree.RayCast(callback, input);
    };
    b2DynamicTreeBroadPhase.prototype.Validate = function () {};
    b2DynamicTreeBroadPhase.prototype.Rebalance = function (iterations) {
      if (iterations === undefined) iterations = 0;
      this.m_tree.Rebalance(iterations);
    };
    b2DynamicTreeBroadPhase.prototype.BufferMove = function (proxy) {
      this.m_moveBuffer[this.m_moveBuffer.length] = proxy;
    };
    b2DynamicTreeBroadPhase.prototype.UnBufferMove = function (proxy) {
      var i = parseInt(this.m_moveBuffer.indexOf(proxy));
      this.m_moveBuffer.splice(i, 1);
    };
    b2DynamicTreeBroadPhase.prototype.ComparePairs = function (pair1, pair2) {
      return 0;
    };
    b2DynamicTreeBroadPhase.__implements = {};
    b2DynamicTreeBroadPhase.__implements[IBroadPhase] = true;
    b2DynamicTreeNode.b2DynamicTreeNode = function () {
      this.aabb = new b2AABB();
    };
    b2DynamicTreeNode.prototype.IsLeaf = function () {
      return this.child1 == null;
    };
    b2DynamicTreePair.b2DynamicTreePair = function () {};
    b2Manifold.b2Manifold = function () {
      this.m_pointCount = 0;
    };
    b2Manifold.prototype.b2Manifold = function () {
      this.m_points = new Vector(b2Settings.b2_maxManifoldPoints);
      for (var i = 0; i < b2Settings.b2_maxManifoldPoints; i++) {
        this.m_points[i] = new b2ManifoldPoint();
      }
      this.m_localPlaneNormal = new b2Vec2();
      this.m_localPoint = new b2Vec2();
    };
    b2Manifold.prototype.Reset = function () {
      for (var i = 0; i < b2Settings.b2_maxManifoldPoints; i++) {
        (this.m_points[i] instanceof b2ManifoldPoint
          ? this.m_points[i]
          : null
        ).Reset();
      }
      this.m_localPlaneNormal.SetZero();
      this.m_localPoint.SetZero();
      this.m_type = 0;
      this.m_pointCount = 0;
    };
    b2Manifold.prototype.Set = function (m) {
      this.m_pointCount = m.m_pointCount;
      for (var i = 0; i < b2Settings.b2_maxManifoldPoints; i++) {
        (this.m_points[i] instanceof b2ManifoldPoint
          ? this.m_points[i]
          : null
        ).Set(m.m_points[i]);
      }
      this.m_localPlaneNormal.SetV(m.m_localPlaneNormal);
      this.m_localPoint.SetV(m.m_localPoint);
      this.m_type = m.m_type;
    };
    b2Manifold.prototype.Copy = function () {
      var copy = new b2Manifold();
      copy.Set(this);
      return copy;
    };
    Box2D.postDefs.push(function () {
      Box2D.Collision.b2Manifold.e_circles = 0x0001;
      Box2D.Collision.b2Manifold.e_faceA = 0x0002;
      Box2D.Collision.b2Manifold.e_faceB = 0x0004;
    });
    b2ManifoldPoint.b2ManifoldPoint = function () {
      this.m_localPoint = new b2Vec2();
      this.m_id = new b2ContactID();
    };
    b2ManifoldPoint.prototype.b2ManifoldPoint = function () {
      this.Reset();
    };
    b2ManifoldPoint.prototype.Reset = function () {
      this.m_localPoint.SetZero();
      this.m_normalImpulse = 0.0;
      this.m_tangentImpulse = 0.0;
      this.m_id.key = 0;
    };
    b2ManifoldPoint.prototype.Set = function (m) {
      this.m_localPoint.SetV(m.m_localPoint);
      this.m_normalImpulse = m.m_normalImpulse;
      this.m_tangentImpulse = m.m_tangentImpulse;
      this.m_id.Set(m.m_id);
    };
    b2Point.b2Point = function () {
      this.p = new b2Vec2();
    };
    b2Point.prototype.Support = function (xf, vX, vY) {
      if (vX === undefined) vX = 0;
      if (vY === undefined) vY = 0;
      return this.p;
    };
    b2Point.prototype.GetFirstVertex = function (xf) {
      return this.p;
    };
    b2RayCastInput.b2RayCastInput = function () {
      this.p1 = new b2Vec2();
      this.p2 = new b2Vec2();
    };
    b2RayCastInput.prototype.b2RayCastInput = function (p1, p2, maxFraction) {
      if (p1 === undefined) p1 = null;
      if (p2 === undefined) p2 = null;
      if (maxFraction === undefined) maxFraction = 1;
      if (p1) this.p1.SetV(p1);
      if (p2) this.p2.SetV(p2);
      this.maxFraction = maxFraction;
    };
    b2RayCastOutput.b2RayCastOutput = function () {
      this.normal = new b2Vec2();
    };
    b2Segment.b2Segment = function () {
      this.p1 = new b2Vec2();
      this.p2 = new b2Vec2();
    };
    b2Segment.prototype.TestSegment = function (
      lambda,
      normal,
      segment,
      maxLambda
    ) {
      if (maxLambda === undefined) maxLambda = 0;
      var s = segment.p1;
      var rX = segment.p2.x - s.x;
      var rY = segment.p2.y - s.y;
      var dX = this.p2.x - this.p1.x;
      var dY = this.p2.y - this.p1.y;
      var nX = dY;
      var nY = -dX;
      var k_slop = 100.0 * Number.MIN_VALUE;
      var denom = -(rX * nX + rY * nY);
      if (denom > k_slop) {
        var bX = s.x - this.p1.x;
        var bY = s.y - this.p1.y;
        var a = bX * nX + bY * nY;
        if (0.0 <= a && a <= maxLambda * denom) {
          var mu2 = -rX * bY + rY * bX;
          if (-k_slop * denom <= mu2 && mu2 <= denom * (1.0 + k_slop)) {
            a /= denom;
            var nLen = Math.sqrt(nX * nX + nY * nY);
            nX /= nLen;
            nY /= nLen;
            lambda[0] = a;
            normal.Set(nX, nY);
            return true;
          }
        }
      }
      return false;
    };
    b2Segment.prototype.Extend = function (aabb) {
      this.ExtendForward(aabb);
      this.ExtendBackward(aabb);
    };
    b2Segment.prototype.ExtendForward = function (aabb) {
      var dX = this.p2.x - this.p1.x;
      var dY = this.p2.y - this.p1.y;
      var lambda = Math.min(
        dX > 0
          ? (aabb.upperBound.x - this.p1.x) / dX
          : dX < 0
            ? (aabb.lowerBound.x - this.p1.x) / dX
            : Number.POSITIVE_INFINITY,
        dY > 0
          ? (aabb.upperBound.y - this.p1.y) / dY
          : dY < 0
            ? (aabb.lowerBound.y - this.p1.y) / dY
            : Number.POSITIVE_INFINITY
      );
      this.p2.x = this.p1.x + dX * lambda;
      this.p2.y = this.p1.y + dY * lambda;
    };
    b2Segment.prototype.ExtendBackward = function (aabb) {
      var dX = -this.p2.x + this.p1.x;
      var dY = -this.p2.y + this.p1.y;
      var lambda = Math.min(
        dX > 0
          ? (aabb.upperBound.x - this.p2.x) / dX
          : dX < 0
            ? (aabb.lowerBound.x - this.p2.x) / dX
            : Number.POSITIVE_INFINITY,
        dY > 0
          ? (aabb.upperBound.y - this.p2.y) / dY
          : dY < 0
            ? (aabb.lowerBound.y - this.p2.y) / dY
            : Number.POSITIVE_INFINITY
      );
      this.p1.x = this.p2.x + dX * lambda;
      this.p1.y = this.p2.y + dY * lambda;
    };
    b2SeparationFunction.b2SeparationFunction = function () {
      this.m_localPoint = new b2Vec2();
      this.m_axis = new b2Vec2();
    };
    b2SeparationFunction.prototype.Initialize = function (
      cache,
      proxyA,
      transformA,
      proxyB,
      transformB
    ) {
      this.m_proxyA = proxyA;
      this.m_proxyB = proxyB;
      var count = parseInt(cache.count);
      b2Settings.b2Assert(0 < count && count < 3);
      var localPointA;
      var localPointA1;
      var localPointA2;
      var localPointB;
      var localPointB1;
      var localPointB2;
      var pointAX = 0;
      var pointAY = 0;
      var pointBX = 0;
      var pointBY = 0;
      var normalX = 0;
      var normalY = 0;
      var tMat;
      var tVec;
      var s = 0;
      var sgn = 0;
      if (count == 1) {
        this.m_type = b2SeparationFunction.e_points;
        localPointA = this.m_proxyA.GetVertex(cache.indexA[0]);
        localPointB = this.m_proxyB.GetVertex(cache.indexB[0]);
        tVec = localPointA;
        tMat = transformA.R;
        pointAX =
          transformA.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
        pointAY =
          transformA.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
        tVec = localPointB;
        tMat = transformB.R;
        pointBX =
          transformB.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
        pointBY =
          transformB.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
        this.m_axis.x = pointBX - pointAX;
        this.m_axis.y = pointBY - pointAY;
        this.m_axis.Normalize();
      } else if (cache.indexB[0] == cache.indexB[1]) {
        this.m_type = b2SeparationFunction.e_faceA;
        localPointA1 = this.m_proxyA.GetVertex(cache.indexA[0]);
        localPointA2 = this.m_proxyA.GetVertex(cache.indexA[1]);
        localPointB = this.m_proxyB.GetVertex(cache.indexB[0]);
        this.m_localPoint.x = 0.5 * (localPointA1.x + localPointA2.x);
        this.m_localPoint.y = 0.5 * (localPointA1.y + localPointA2.y);
        this.m_axis = b2Math.CrossVF(
          b2Math.SubtractVV(localPointA2, localPointA1),
          1.0
        );
        this.m_axis.Normalize();
        tVec = this.m_axis;
        tMat = transformA.R;
        normalX = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
        normalY = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
        tVec = this.m_localPoint;
        tMat = transformA.R;
        pointAX =
          transformA.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
        pointAY =
          transformA.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
        tVec = localPointB;
        tMat = transformB.R;
        pointBX =
          transformB.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
        pointBY =
          transformB.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
        s = (pointBX - pointAX) * normalX + (pointBY - pointAY) * normalY;
        if (s < 0.0) {
          this.m_axis.NegativeSelf();
        }
      } else if (cache.indexA[0] == cache.indexA[0]) {
        this.m_type = b2SeparationFunction.e_faceB;
        localPointB1 = this.m_proxyB.GetVertex(cache.indexB[0]);
        localPointB2 = this.m_proxyB.GetVertex(cache.indexB[1]);
        localPointA = this.m_proxyA.GetVertex(cache.indexA[0]);
        this.m_localPoint.x = 0.5 * (localPointB1.x + localPointB2.x);
        this.m_localPoint.y = 0.5 * (localPointB1.y + localPointB2.y);
        this.m_axis = b2Math.CrossVF(
          b2Math.SubtractVV(localPointB2, localPointB1),
          1.0
        );
        this.m_axis.Normalize();
        tVec = this.m_axis;
        tMat = transformB.R;
        normalX = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
        normalY = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
        tVec = this.m_localPoint;
        tMat = transformB.R;
        pointBX =
          transformB.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
        pointBY =
          transformB.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
        tVec = localPointA;
        tMat = transformA.R;
        pointAX =
          transformA.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
        pointAY =
          transformA.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
        s = (pointAX - pointBX) * normalX + (pointAY - pointBY) * normalY;
        if (s < 0.0) {
          this.m_axis.NegativeSelf();
        }
      } else {
        localPointA1 = this.m_proxyA.GetVertex(cache.indexA[0]);
        localPointA2 = this.m_proxyA.GetVertex(cache.indexA[1]);
        localPointB1 = this.m_proxyB.GetVertex(cache.indexB[0]);
        localPointB2 = this.m_proxyB.GetVertex(cache.indexB[1]);
        var pA = b2Math.MulX(transformA, localPointA);
        var dA = b2Math.MulMV(
          transformA.R,
          b2Math.SubtractVV(localPointA2, localPointA1)
        );
        var pB = b2Math.MulX(transformB, localPointB);
        var dB = b2Math.MulMV(
          transformB.R,
          b2Math.SubtractVV(localPointB2, localPointB1)
        );
        var a = dA.x * dA.x + dA.y * dA.y;
        var e = dB.x * dB.x + dB.y * dB.y;
        var r = b2Math.SubtractVV(dB, dA);
        var c = dA.x * r.x + dA.y * r.y;
        var f = dB.x * r.x + dB.y * r.y;
        var b = dA.x * dB.x + dA.y * dB.y;
        var denom = a * e - b * b;
        s = 0.0;
        if (denom != 0.0) {
          s = b2Math.Clamp((b * f - c * e) / denom, 0.0, 1.0);
        }
        var t = (b * s + f) / e;
        if (t < 0.0) {
          t = 0.0;
          s = b2Math.Clamp((b - c) / a, 0.0, 1.0);
        }
        localPointA = new b2Vec2();
        localPointA.x = localPointA1.x + s * (localPointA2.x - localPointA1.x);
        localPointA.y = localPointA1.y + s * (localPointA2.y - localPointA1.y);
        localPointB = new b2Vec2();
        localPointB.x = localPointB1.x + s * (localPointB2.x - localPointB1.x);
        localPointB.y = localPointB1.y + s * (localPointB2.y - localPointB1.y);
        if (s == 0.0 || s == 1.0) {
          this.m_type = b2SeparationFunction.e_faceB;
          this.m_axis = b2Math.CrossVF(
            b2Math.SubtractVV(localPointB2, localPointB1),
            1.0
          );
          this.m_axis.Normalize();
          this.m_localPoint = localPointB;
          tVec = this.m_axis;
          tMat = transformB.R;
          normalX = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
          normalY = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
          tVec = this.m_localPoint;
          tMat = transformB.R;
          pointBX =
            transformB.position.x +
            (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
          pointBY =
            transformB.position.y +
            (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
          tVec = localPointA;
          tMat = transformA.R;
          pointAX =
            transformA.position.x +
            (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
          pointAY =
            transformA.position.y +
            (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
          sgn = (pointAX - pointBX) * normalX + (pointAY - pointBY) * normalY;
          if (s < 0.0) {
            this.m_axis.NegativeSelf();
          }
        } else {
          this.m_type = b2SeparationFunction.e_faceA;
          this.m_axis = b2Math.CrossVF(
            b2Math.SubtractVV(localPointA2, localPointA1),
            1.0
          );
          this.m_localPoint = localPointA;
          tVec = this.m_axis;
          tMat = transformA.R;
          normalX = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
          normalY = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
          tVec = this.m_localPoint;
          tMat = transformA.R;
          pointAX =
            transformA.position.x +
            (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
          pointAY =
            transformA.position.y +
            (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
          tVec = localPointB;
          tMat = transformB.R;
          pointBX =
            transformB.position.x +
            (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
          pointBY =
            transformB.position.y +
            (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
          sgn = (pointBX - pointAX) * normalX + (pointBY - pointAY) * normalY;
          if (s < 0.0) {
            this.m_axis.NegativeSelf();
          }
        }
      }
    };
    b2SeparationFunction.prototype.Evaluate = function (
      transformA,
      transformB
    ) {
      var axisA;
      var axisB;
      var localPointA;
      var localPointB;
      var pointA;
      var pointB;
      var seperation = 0;
      var normal;
      switch (this.m_type) {
        case b2SeparationFunction.e_points: {
          axisA = b2Math.MulTMV(transformA.R, this.m_axis);
          axisB = b2Math.MulTMV(transformB.R, this.m_axis.GetNegative());
          localPointA = this.m_proxyA.GetSupportVertex(axisA);
          localPointB = this.m_proxyB.GetSupportVertex(axisB);
          pointA = b2Math.MulX(transformA, localPointA);
          pointB = b2Math.MulX(transformB, localPointB);
          seperation =
            (pointB.x - pointA.x) * this.m_axis.x +
            (pointB.y - pointA.y) * this.m_axis.y;
          return seperation;
        }
        case b2SeparationFunction.e_faceA: {
          normal = b2Math.MulMV(transformA.R, this.m_axis);
          pointA = b2Math.MulX(transformA, this.m_localPoint);
          axisB = b2Math.MulTMV(transformB.R, normal.GetNegative());
          localPointB = this.m_proxyB.GetSupportVertex(axisB);
          pointB = b2Math.MulX(transformB, localPointB);
          seperation =
            (pointB.x - pointA.x) * normal.x + (pointB.y - pointA.y) * normal.y;
          return seperation;
        }
        case b2SeparationFunction.e_faceB: {
          normal = b2Math.MulMV(transformB.R, this.m_axis);
          pointB = b2Math.MulX(transformB, this.m_localPoint);
          axisA = b2Math.MulTMV(transformA.R, normal.GetNegative());
          localPointA = this.m_proxyA.GetSupportVertex(axisA);
          pointA = b2Math.MulX(transformA, localPointA);
          seperation =
            (pointA.x - pointB.x) * normal.x + (pointA.y - pointB.y) * normal.y;
          return seperation;
        }
        default:
          b2Settings.b2Assert(false);
          return 0.0;
      }
    };
    Box2D.postDefs.push(function () {
      Box2D.Collision.b2SeparationFunction.e_points = 0x01;
      Box2D.Collision.b2SeparationFunction.e_faceA = 0x02;
      Box2D.Collision.b2SeparationFunction.e_faceB = 0x04;
    });
    b2Simplex.b2Simplex = function () {
      this.m_v1 = new b2SimplexVertex();
      this.m_v2 = new b2SimplexVertex();
      this.m_v3 = new b2SimplexVertex();
      this.m_vertices = new Vector(3);
    };
    b2Simplex.prototype.b2Simplex = function () {
      this.m_vertices[0] = this.m_v1;
      this.m_vertices[1] = this.m_v2;
      this.m_vertices[2] = this.m_v3;
    };
    b2Simplex.prototype.ReadCache = function (
      cache,
      proxyA,
      transformA,
      proxyB,
      transformB
    ) {
      b2Settings.b2Assert(0 <= cache.count && cache.count <= 3);
      var wALocal;
      var wBLocal;
      this.m_count = cache.count;
      var vertices = this.m_vertices;
      for (var i = 0; i < this.m_count; i++) {
        var v = vertices[i];
        v.indexA = cache.indexA[i];
        v.indexB = cache.indexB[i];
        wALocal = proxyA.GetVertex(v.indexA);
        wBLocal = proxyB.GetVertex(v.indexB);
        v.wA = b2Math.MulX(transformA, wALocal);
        v.wB = b2Math.MulX(transformB, wBLocal);
        v.w = b2Math.SubtractVV(v.wB, v.wA);
        v.a = 0;
      }
      if (this.m_count > 1) {
        var metric1 = cache.metric;
        var metric2 = this.GetMetric();
        if (
          metric2 < 0.5 * metric1 ||
          2.0 * metric1 < metric2 ||
          metric2 < Number.MIN_VALUE
        ) {
          this.m_count = 0;
        }
      }
      if (this.m_count == 0) {
        v = vertices[0];
        v.indexA = 0;
        v.indexB = 0;
        wALocal = proxyA.GetVertex(0);
        wBLocal = proxyB.GetVertex(0);
        v.wA = b2Math.MulX(transformA, wALocal);
        v.wB = b2Math.MulX(transformB, wBLocal);
        v.w = b2Math.SubtractVV(v.wB, v.wA);
        this.m_count = 1;
      }
    };
    b2Simplex.prototype.WriteCache = function (cache) {
      cache.metric = this.GetMetric();
      cache.count = Box2D.parseUInt(this.m_count);
      var vertices = this.m_vertices;
      for (var i = 0; i < this.m_count; i++) {
        cache.indexA[i] = Box2D.parseUInt(vertices[i].indexA);
        cache.indexB[i] = Box2D.parseUInt(vertices[i].indexB);
      }
    };
    b2Simplex.prototype.GetSearchDirection = function () {
      switch (this.m_count) {
        case 1:
          return this.m_v1.w.GetNegative();
        case 2: {
          var e12 = b2Math.SubtractVV(this.m_v2.w, this.m_v1.w);
          var sgn = b2Math.CrossVV(e12, this.m_v1.w.GetNegative());
          if (sgn > 0.0) {
            return b2Math.CrossFV(1.0, e12);
          } else {
            return b2Math.CrossVF(e12, 1.0);
          }
        }
        default:
          b2Settings.b2Assert(false);
          return new b2Vec2();
      }
    };
    b2Simplex.prototype.GetClosestPoint = function () {
      switch (this.m_count) {
        case 0:
          b2Settings.b2Assert(false);
          return new b2Vec2();
        case 1:
          return this.m_v1.w;
        case 2:
          return new b2Vec2(
            this.m_v1.a * this.m_v1.w.x + this.m_v2.a * this.m_v2.w.x,
            this.m_v1.a * this.m_v1.w.y + this.m_v2.a * this.m_v2.w.y
          );
        default:
          b2Settings.b2Assert(false);
          return new b2Vec2();
      }
    };
    b2Simplex.prototype.GetWitnessPoints = function (pA, pB) {
      switch (this.m_count) {
        case 0:
          b2Settings.b2Assert(false);
          break;
        case 1:
          pA.SetV(this.m_v1.wA);
          pB.SetV(this.m_v1.wB);
          break;
        case 2:
          pA.x = this.m_v1.a * this.m_v1.wA.x + this.m_v2.a * this.m_v2.wA.x;
          pA.y = this.m_v1.a * this.m_v1.wA.y + this.m_v2.a * this.m_v2.wA.y;
          pB.x = this.m_v1.a * this.m_v1.wB.x + this.m_v2.a * this.m_v2.wB.x;
          pB.y = this.m_v1.a * this.m_v1.wB.y + this.m_v2.a * this.m_v2.wB.y;
          break;
        case 3:
          pB.x = pA.x =
            this.m_v1.a * this.m_v1.wA.x +
            this.m_v2.a * this.m_v2.wA.x +
            this.m_v3.a * this.m_v3.wA.x;
          pB.y = pA.y =
            this.m_v1.a * this.m_v1.wA.y +
            this.m_v2.a * this.m_v2.wA.y +
            this.m_v3.a * this.m_v3.wA.y;
          break;
        default:
          b2Settings.b2Assert(false);
          break;
      }
    };
    b2Simplex.prototype.GetMetric = function () {
      switch (this.m_count) {
        case 0:
          b2Settings.b2Assert(false);
          return 0.0;
        case 1:
          return 0.0;
        case 2:
          return b2Math.SubtractVV(this.m_v1.w, this.m_v2.w).Length();
        case 3:
          return b2Math.CrossVV(
            b2Math.SubtractVV(this.m_v2.w, this.m_v1.w),
            b2Math.SubtractVV(this.m_v3.w, this.m_v1.w)
          );
        default:
          b2Settings.b2Assert(false);
          return 0.0;
      }
    };
    b2Simplex.prototype.Solve2 = function () {
      var w1 = this.m_v1.w;
      var w2 = this.m_v2.w;
      var e12 = b2Math.SubtractVV(w2, w1);
      var d12_2 = -(w1.x * e12.x + w1.y * e12.y);
      if (d12_2 <= 0.0) {
        this.m_v1.a = 1.0;
        this.m_count = 1;
        return;
      }
      var d12_1 = w2.x * e12.x + w2.y * e12.y;
      if (d12_1 <= 0.0) {
        this.m_v2.a = 1.0;
        this.m_count = 1;
        this.m_v1.Set(this.m_v2);
        return;
      }
      var inv_d12 = 1.0 / (d12_1 + d12_2);
      this.m_v1.a = d12_1 * inv_d12;
      this.m_v2.a = d12_2 * inv_d12;
      this.m_count = 2;
    };
    b2Simplex.prototype.Solve3 = function () {
      var w1 = this.m_v1.w;
      var w2 = this.m_v2.w;
      var w3 = this.m_v3.w;
      var e12 = b2Math.SubtractVV(w2, w1);
      var w1e12 = b2Math.Dot(w1, e12);
      var w2e12 = b2Math.Dot(w2, e12);
      var d12_1 = w2e12;
      var d12_2 = -w1e12;
      var e13 = b2Math.SubtractVV(w3, w1);
      var w1e13 = b2Math.Dot(w1, e13);
      var w3e13 = b2Math.Dot(w3, e13);
      var d13_1 = w3e13;
      var d13_2 = -w1e13;
      var e23 = b2Math.SubtractVV(w3, w2);
      var w2e23 = b2Math.Dot(w2, e23);
      var w3e23 = b2Math.Dot(w3, e23);
      var d23_1 = w3e23;
      var d23_2 = -w2e23;
      var n123 = b2Math.CrossVV(e12, e13);
      var d123_1 = n123 * b2Math.CrossVV(w2, w3);
      var d123_2 = n123 * b2Math.CrossVV(w3, w1);
      var d123_3 = n123 * b2Math.CrossVV(w1, w2);
      if (d12_2 <= 0.0 && d13_2 <= 0.0) {
        this.m_v1.a = 1.0;
        this.m_count = 1;
        return;
      }
      if (d12_1 > 0.0 && d12_2 > 0.0 && d123_3 <= 0.0) {
        var inv_d12 = 1.0 / (d12_1 + d12_2);
        this.m_v1.a = d12_1 * inv_d12;
        this.m_v2.a = d12_2 * inv_d12;
        this.m_count = 2;
        return;
      }
      if (d13_1 > 0.0 && d13_2 > 0.0 && d123_2 <= 0.0) {
        var inv_d13 = 1.0 / (d13_1 + d13_2);
        this.m_v1.a = d13_1 * inv_d13;
        this.m_v3.a = d13_2 * inv_d13;
        this.m_count = 2;
        this.m_v2.Set(this.m_v3);
        return;
      }
      if (d12_1 <= 0.0 && d23_2 <= 0.0) {
        this.m_v2.a = 1.0;
        this.m_count = 1;
        this.m_v1.Set(this.m_v2);
        return;
      }
      if (d13_1 <= 0.0 && d23_1 <= 0.0) {
        this.m_v3.a = 1.0;
        this.m_count = 1;
        this.m_v1.Set(this.m_v3);
        return;
      }
      if (d23_1 > 0.0 && d23_2 > 0.0 && d123_1 <= 0.0) {
        var inv_d23 = 1.0 / (d23_1 + d23_2);
        this.m_v2.a = d23_1 * inv_d23;
        this.m_v3.a = d23_2 * inv_d23;
        this.m_count = 2;
        this.m_v1.Set(this.m_v3);
        return;
      }
      var inv_d123 = 1.0 / (d123_1 + d123_2 + d123_3);
      this.m_v1.a = d123_1 * inv_d123;
      this.m_v2.a = d123_2 * inv_d123;
      this.m_v3.a = d123_3 * inv_d123;
      this.m_count = 3;
    };
    b2SimplexCache.b2SimplexCache = function () {
      this.indexA = new Vector_a2j_Number(3);
      this.indexB = new Vector_a2j_Number(3);
    };
    b2SimplexVertex.b2SimplexVertex = function () {};
    b2SimplexVertex.prototype.Set = function (other) {
      this.wA.SetV(other.wA);
      this.wB.SetV(other.wB);
      this.w.SetV(other.w);
      this.a = other.a;
      this.indexA = other.indexA;
      this.indexB = other.indexB;
    };
    b2TimeOfImpact.b2TimeOfImpact = function () {};
    b2TimeOfImpact.TimeOfImpact = function (input) {
      ++b2TimeOfImpact.b2_toiCalls;
      var proxyA = input.proxyA;
      var proxyB = input.proxyB;
      var sweepA = input.sweepA;
      var sweepB = input.sweepB;
      b2Settings.b2Assert(sweepA.t0 == sweepB.t0);
      b2Settings.b2Assert(1.0 - sweepA.t0 > Number.MIN_VALUE);
      var radius = proxyA.m_radius + proxyB.m_radius;
      var tolerance = input.tolerance;
      var alpha = 0.0;
      var k_maxIterations = 1000;
      var iter = 0;
      var target = 0.0;
      b2TimeOfImpact.s_cache.count = 0;
      b2TimeOfImpact.s_distanceInput.useRadii = false;
      for (;;) {
        sweepA.GetTransform(b2TimeOfImpact.s_xfA, alpha);
        sweepB.GetTransform(b2TimeOfImpact.s_xfB, alpha);
        b2TimeOfImpact.s_distanceInput.proxyA = proxyA;
        b2TimeOfImpact.s_distanceInput.proxyB = proxyB;
        b2TimeOfImpact.s_distanceInput.transformA = b2TimeOfImpact.s_xfA;
        b2TimeOfImpact.s_distanceInput.transformB = b2TimeOfImpact.s_xfB;
        b2Distance.Distance(
          b2TimeOfImpact.s_distanceOutput,
          b2TimeOfImpact.s_cache,
          b2TimeOfImpact.s_distanceInput
        );
        if (b2TimeOfImpact.s_distanceOutput.distance <= 0.0) {
          alpha = 1.0;
          break;
        }
        b2TimeOfImpact.s_fcn.Initialize(
          b2TimeOfImpact.s_cache,
          proxyA,
          b2TimeOfImpact.s_xfA,
          proxyB,
          b2TimeOfImpact.s_xfB
        );
        var separation = b2TimeOfImpact.s_fcn.Evaluate(
          b2TimeOfImpact.s_xfA,
          b2TimeOfImpact.s_xfB
        );
        if (separation <= 0.0) {
          alpha = 1.0;
          break;
        }
        if (iter == 0) {
          if (separation > radius) {
            target = b2Math.Max(radius - tolerance, 0.75 * radius);
          } else {
            target = b2Math.Max(separation - tolerance, 0.02 * radius);
          }
        }
        if (separation - target < 0.5 * tolerance) {
          if (iter == 0) {
            alpha = 1.0;
            break;
          }
          break;
        }
        var newAlpha = alpha;
        {
          var x1 = alpha;
          var x2 = 1.0;
          var f1 = separation;
          sweepA.GetTransform(b2TimeOfImpact.s_xfA, x2);
          sweepB.GetTransform(b2TimeOfImpact.s_xfB, x2);
          var f2 = b2TimeOfImpact.s_fcn.Evaluate(
            b2TimeOfImpact.s_xfA,
            b2TimeOfImpact.s_xfB
          );
          if (f2 >= target) {
            alpha = 1.0;
            break;
          }
          var rootIterCount = 0;
          for (;;) {
            var x = 0;
            if (rootIterCount & 1) {
              x = x1 + ((target - f1) * (x2 - x1)) / (f2 - f1);
            } else {
              x = 0.5 * (x1 + x2);
            }
            sweepA.GetTransform(b2TimeOfImpact.s_xfA, x);
            sweepB.GetTransform(b2TimeOfImpact.s_xfB, x);
            var f = b2TimeOfImpact.s_fcn.Evaluate(
              b2TimeOfImpact.s_xfA,
              b2TimeOfImpact.s_xfB
            );
            if (b2Math.Abs(f - target) < 0.025 * tolerance) {
              newAlpha = x;
              break;
            }
            if (f > target) {
              x1 = x;
              f1 = f;
            } else {
              x2 = x;
              f2 = f;
            }
            ++rootIterCount;
            ++b2TimeOfImpact.b2_toiRootIters;
            if (rootIterCount == 50) {
              break;
            }
          }
          b2TimeOfImpact.b2_toiMaxRootIters = b2Math.Max(
            b2TimeOfImpact.b2_toiMaxRootIters,
            rootIterCount
          );
        }
        if (newAlpha < (1.0 + 100.0 * Number.MIN_VALUE) * alpha) {
          break;
        }
        alpha = newAlpha;
        iter++;
        ++b2TimeOfImpact.b2_toiIters;
        if (iter == k_maxIterations) {
          break;
        }
      }
      b2TimeOfImpact.b2_toiMaxIters = b2Math.Max(
        b2TimeOfImpact.b2_toiMaxIters,
        iter
      );
      return alpha;
    };
    Box2D.postDefs.push(function () {
      Box2D.Collision.b2TimeOfImpact.b2_toiCalls = 0;
      Box2D.Collision.b2TimeOfImpact.b2_toiIters = 0;
      Box2D.Collision.b2TimeOfImpact.b2_toiMaxIters = 0;
      Box2D.Collision.b2TimeOfImpact.b2_toiRootIters = 0;
      Box2D.Collision.b2TimeOfImpact.b2_toiMaxRootIters = 0;
      Box2D.Collision.b2TimeOfImpact.s_cache = new b2SimplexCache();
      Box2D.Collision.b2TimeOfImpact.s_distanceInput = new b2DistanceInput();
      Box2D.Collision.b2TimeOfImpact.s_xfA = new b2Transform();
      Box2D.Collision.b2TimeOfImpact.s_xfB = new b2Transform();
      Box2D.Collision.b2TimeOfImpact.s_fcn = new b2SeparationFunction();
      Box2D.Collision.b2TimeOfImpact.s_distanceOutput = new b2DistanceOutput();
    });
    b2TOIInput.b2TOIInput = function () {
      this.proxyA = new b2DistanceProxy();
      this.proxyB = new b2DistanceProxy();
      this.sweepA = new b2Sweep();
      this.sweepB = new b2Sweep();
    };
    b2WorldManifold.b2WorldManifold = function () {
      this.m_normal = new b2Vec2();
    };
    b2WorldManifold.prototype.b2WorldManifold = function () {
      this.m_points = new Vector(b2Settings.b2_maxManifoldPoints);
      for (var i = 0; i < b2Settings.b2_maxManifoldPoints; i++) {
        this.m_points[i] = new b2Vec2();
      }
    };
    b2WorldManifold.prototype.Initialize = function (
      manifold,
      xfA,
      radiusA,
      xfB,
      radiusB
    ) {
      if (radiusA === undefined) radiusA = 0;
      if (radiusB === undefined) radiusB = 0;
      if (manifold.m_pointCount == 0) {
        return;
      }
      var i = 0;
      var tVec;
      var tMat;
      var normalX = 0;
      var normalY = 0;
      var planePointX = 0;
      var planePointY = 0;
      var clipPointX = 0;
      var clipPointY = 0;
      switch (manifold.m_type) {
        case b2Manifold.e_circles:
          {
            tMat = xfA.R;
            tVec = manifold.m_localPoint;
            var pointAX =
              xfA.position.x + tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
            var pointAY =
              xfA.position.y + tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
            tMat = xfB.R;
            tVec = manifold.m_points[0].m_localPoint;
            var pointBX =
              xfB.position.x + tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
            var pointBY =
              xfB.position.y + tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
            var dX = pointBX - pointAX;
            var dY = pointBY - pointAY;
            var d2 = dX * dX + dY * dY;
            if (d2 > Number.MIN_VALUE * Number.MIN_VALUE) {
              var d = Math.sqrt(d2);
              this.m_normal.x = dX / d;
              this.m_normal.y = dY / d;
            } else {
              this.m_normal.x = 1;
              this.m_normal.y = 0;
            }
            var cAX = pointAX + radiusA * this.m_normal.x;
            var cAY = pointAY + radiusA * this.m_normal.y;
            var cBX = pointBX - radiusB * this.m_normal.x;
            var cBY = pointBY - radiusB * this.m_normal.y;
            this.m_points[0].x = 0.5 * (cAX + cBX);
            this.m_points[0].y = 0.5 * (cAY + cBY);
          }
          break;
        case b2Manifold.e_faceA:
          {
            tMat = xfA.R;
            tVec = manifold.m_localPlaneNormal;
            normalX = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
            normalY = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
            tMat = xfA.R;
            tVec = manifold.m_localPoint;
            planePointX =
              xfA.position.x + tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
            planePointY =
              xfA.position.y + tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
            this.m_normal.x = normalX;
            this.m_normal.y = normalY;
            for (i = 0; i < manifold.m_pointCount; i++) {
              tMat = xfB.R;
              tVec = manifold.m_points[i].m_localPoint;
              clipPointX =
                xfB.position.x + tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
              clipPointY =
                xfB.position.y + tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
              this.m_points[i].x =
                clipPointX +
                0.5 *
                  (radiusA -
                    (clipPointX - planePointX) * normalX -
                    (clipPointY - planePointY) * normalY -
                    radiusB) *
                  normalX;
              this.m_points[i].y =
                clipPointY +
                0.5 *
                  (radiusA -
                    (clipPointX - planePointX) * normalX -
                    (clipPointY - planePointY) * normalY -
                    radiusB) *
                  normalY;
            }
          }
          break;
        case b2Manifold.e_faceB:
          {
            tMat = xfB.R;
            tVec = manifold.m_localPlaneNormal;
            normalX = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
            normalY = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
            tMat = xfB.R;
            tVec = manifold.m_localPoint;
            planePointX =
              xfB.position.x + tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
            planePointY =
              xfB.position.y + tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
            this.m_normal.x = -normalX;
            this.m_normal.y = -normalY;
            for (i = 0; i < manifold.m_pointCount; i++) {
              tMat = xfA.R;
              tVec = manifold.m_points[i].m_localPoint;
              clipPointX =
                xfA.position.x + tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
              clipPointY =
                xfA.position.y + tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
              this.m_points[i].x =
                clipPointX +
                0.5 *
                  (radiusB -
                    (clipPointX - planePointX) * normalX -
                    (clipPointY - planePointY) * normalY -
                    radiusA) *
                  normalX;
              this.m_points[i].y =
                clipPointY +
                0.5 *
                  (radiusB -
                    (clipPointX - planePointX) * normalX -
                    (clipPointY - planePointY) * normalY -
                    radiusA) *
                  normalY;
            }
          }
          break;
      }
    };
    ClipVertex.ClipVertex = function () {
      this.v = new b2Vec2();
      this.id = new b2ContactID();
    };
    ClipVertex.prototype.Set = function (other) {
      this.v.SetV(other.v);
      this.id.Set(other.id);
    };
    Features.Features = function () {};
    Object.defineProperty(Features.prototype, "referenceEdge", {
      enumerable: false,
      configurable: true,
      get: function () {
        return this._referenceEdge;
      },
    });
    Object.defineProperty(Features.prototype, "referenceEdge", {
      enumerable: false,
      configurable: true,
      set: function (value) {
        if (value === undefined) value = 0;
        this._referenceEdge = value;
        this._m_id._key =
          (this._m_id._key & 0xffffff00) | (this._referenceEdge & 0x000000ff);
      },
    });
    Object.defineProperty(Features.prototype, "incidentEdge", {
      enumerable: false,
      configurable: true,
      get: function () {
        return this._incidentEdge;
      },
    });
    Object.defineProperty(Features.prototype, "incidentEdge", {
      enumerable: false,
      configurable: true,
      set: function (value) {
        if (value === undefined) value = 0;
        this._incidentEdge = value;
        this._m_id._key =
          (this._m_id._key & 0xffff00ff) |
          ((this._incidentEdge << 8) & 0x0000ff00);
      },
    });
    Object.defineProperty(Features.prototype, "incidentVertex", {
      enumerable: false,
      configurable: true,
      get: function () {
        return this._incidentVertex;
      },
    });
    Object.defineProperty(Features.prototype, "incidentVertex", {
      enumerable: false,
      configurable: true,
      set: function (value) {
        if (value === undefined) value = 0;
        this._incidentVertex = value;
        this._m_id._key =
          (this._m_id._key & 0xff00ffff) |
          ((this._incidentVertex << 16) & 0x00ff0000);
      },
    });
    Object.defineProperty(Features.prototype, "flip", {
      enumerable: false,
      configurable: true,
      get: function () {
        return this._flip;
      },
    });
    Object.defineProperty(Features.prototype, "flip", {
      enumerable: false,
      configurable: true,
      set: function (value) {
        if (value === undefined) value = 0;
        this._flip = value;
        this._m_id._key =
          (this._m_id._key & 0x00ffffff) | ((this._flip << 24) & 0xff000000);
      },
    });
  })();
  (function () {
    var b2Color = Box2D.Common.b2Color,
      b2internal = Box2D.Common.b2internal,
      b2Settings = Box2D.Common.b2Settings,
      b2CircleShape = Box2D.Collision.Shapes.b2CircleShape,
      b2EdgeChainDef = Box2D.Collision.Shapes.b2EdgeChainDef,
      b2EdgeShape = Box2D.Collision.Shapes.b2EdgeShape,
      b2MassData = Box2D.Collision.Shapes.b2MassData,
      b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape,
      b2Shape = Box2D.Collision.Shapes.b2Shape,
      b2Mat22 = Box2D.Common.Math.b2Mat22,
      b2Mat33 = Box2D.Common.Math.b2Mat33,
      b2Math = Box2D.Common.Math.b2Math,
      b2Sweep = Box2D.Common.Math.b2Sweep,
      b2Transform = Box2D.Common.Math.b2Transform,
      b2Vec2 = Box2D.Common.Math.b2Vec2,
      b2Vec3 = Box2D.Common.Math.b2Vec3,
      b2Body = Box2D.Dynamics.b2Body,
      b2BodyDef = Box2D.Dynamics.b2BodyDef,
      b2ContactFilter = Box2D.Dynamics.b2ContactFilter,
      b2ContactImpulse = Box2D.Dynamics.b2ContactImpulse,
      b2ContactListener = Box2D.Dynamics.b2ContactListener,
      b2ContactManager = Box2D.Dynamics.b2ContactManager,
      b2DebugDraw = Box2D.Dynamics.b2DebugDraw,
      b2DestructionListener = Box2D.Dynamics.b2DestructionListener,
      b2FilterData = Box2D.Dynamics.b2FilterData,
      b2Fixture = Box2D.Dynamics.b2Fixture,
      b2FixtureDef = Box2D.Dynamics.b2FixtureDef,
      b2Island = Box2D.Dynamics.b2Island,
      b2TimeStep = Box2D.Dynamics.b2TimeStep,
      b2World = Box2D.Dynamics.b2World,
      b2AABB = Box2D.Collision.b2AABB,
      b2Bound = Box2D.Collision.b2Bound,
      b2BoundValues = Box2D.Collision.b2BoundValues,
      b2Collision = Box2D.Collision.b2Collision,
      b2ContactID = Box2D.Collision.b2ContactID,
      b2ContactPoint = Box2D.Collision.b2ContactPoint,
      b2Distance = Box2D.Collision.b2Distance,
      b2DistanceInput = Box2D.Collision.b2DistanceInput,
      b2DistanceOutput = Box2D.Collision.b2DistanceOutput,
      b2DistanceProxy = Box2D.Collision.b2DistanceProxy,
      b2DynamicTree = Box2D.Collision.b2DynamicTree,
      b2DynamicTreeBroadPhase = Box2D.Collision.b2DynamicTreeBroadPhase,
      b2DynamicTreeNode = Box2D.Collision.b2DynamicTreeNode,
      b2DynamicTreePair = Box2D.Collision.b2DynamicTreePair,
      b2Manifold = Box2D.Collision.b2Manifold,
      b2ManifoldPoint = Box2D.Collision.b2ManifoldPoint,
      b2Point = Box2D.Collision.b2Point,
      b2RayCastInput = Box2D.Collision.b2RayCastInput,
      b2RayCastOutput = Box2D.Collision.b2RayCastOutput,
      b2Segment = Box2D.Collision.b2Segment,
      b2SeparationFunction = Box2D.Collision.b2SeparationFunction,
      b2Simplex = Box2D.Collision.b2Simplex,
      b2SimplexCache = Box2D.Collision.b2SimplexCache,
      b2SimplexVertex = Box2D.Collision.b2SimplexVertex,
      b2TimeOfImpact = Box2D.Collision.b2TimeOfImpact,
      b2TOIInput = Box2D.Collision.b2TOIInput,
      b2WorldManifold = Box2D.Collision.b2WorldManifold,
      ClipVertex = Box2D.Collision.ClipVertex,
      Features = Box2D.Collision.Features,
      IBroadPhase = Box2D.Collision.IBroadPhase;

    Box2D.inherit(b2CircleShape, Box2D.Collision.Shapes.b2Shape);
    b2CircleShape.prototype.__super = Box2D.Collision.Shapes.b2Shape.prototype;
    b2CircleShape.b2CircleShape = function () {
      Box2D.Collision.Shapes.b2Shape.b2Shape.apply(this, arguments);
      this.m_p = new b2Vec2();
    };
    b2CircleShape.prototype.Copy = function () {
      var s = new b2CircleShape();
      s.Set(this);
      return s;
    };
    b2CircleShape.prototype.Set = function (other) {
      this.__super.Set.call(this, other);
      if (Box2D.is(other, b2CircleShape)) {
        var other2 = other instanceof b2CircleShape ? other : null;
        this.m_p.SetV(other2.m_p);
      }
    };
    b2CircleShape.prototype.TestPoint = function (transform, p) {
      var tMat = transform.R;
      var dX =
        transform.position.x +
        (tMat.col1.x * this.m_p.x + tMat.col2.x * this.m_p.y);
      var dY =
        transform.position.y +
        (tMat.col1.y * this.m_p.x + tMat.col2.y * this.m_p.y);
      dX = p.x - dX;
      dY = p.y - dY;
      return dX * dX + dY * dY <= this.m_radius * this.m_radius;
    };
    b2CircleShape.prototype.RayCast = function (output, input, transform) {
      var tMat = transform.R;
      var positionX =
        transform.position.x +
        (tMat.col1.x * this.m_p.x + tMat.col2.x * this.m_p.y);
      var positionY =
        transform.position.y +
        (tMat.col1.y * this.m_p.x + tMat.col2.y * this.m_p.y);
      var sX = input.p1.x - positionX;
      var sY = input.p1.y - positionY;
      var b = sX * sX + sY * sY - this.m_radius * this.m_radius;
      var rX = input.p2.x - input.p1.x;
      var rY = input.p2.y - input.p1.y;
      var c = sX * rX + sY * rY;
      var rr = rX * rX + rY * rY;
      var sigma = c * c - rr * b;
      if (sigma < 0.0 || rr < Number.MIN_VALUE) {
        return false;
      }
      var a = -(c + Math.sqrt(sigma));
      if (0.0 <= a && a <= input.maxFraction * rr) {
        a /= rr;
        output.fraction = a;
        output.normal.x = sX + a * rX;
        output.normal.y = sY + a * rY;
        output.normal.Normalize();
        return true;
      }
      return false;
    };
    b2CircleShape.prototype.ComputeAABB = function (aabb, transform) {
      var tMat = transform.R;
      var pX =
        transform.position.x +
        (tMat.col1.x * this.m_p.x + tMat.col2.x * this.m_p.y);
      var pY =
        transform.position.y +
        (tMat.col1.y * this.m_p.x + tMat.col2.y * this.m_p.y);
      aabb.lowerBound.Set(pX - this.m_radius, pY - this.m_radius);
      aabb.upperBound.Set(pX + this.m_radius, pY + this.m_radius);
    };
    b2CircleShape.prototype.ComputeMass = function (massData, density) {
      if (density === undefined) density = 0;
      massData.mass =
        density * b2Settings.b2_pi * this.m_radius * this.m_radius;
      massData.center.SetV(this.m_p);
      massData.I =
        massData.mass *
        (0.5 * this.m_radius * this.m_radius +
          (this.m_p.x * this.m_p.x + this.m_p.y * this.m_p.y));
    };
    b2CircleShape.prototype.ComputeSubmergedArea = function (
      normal,
      offset,
      xf,
      c
    ) {
      if (offset === undefined) offset = 0;
      var p = b2Math.MulX(xf, this.m_p);
      var l = -(b2Math.Dot(normal, p) - offset);
      if (l < -this.m_radius + Number.MIN_VALUE) {
        return 0;
      }
      if (l > this.m_radius) {
        c.SetV(p);
        return Math.PI * this.m_radius * this.m_radius;
      }
      var r2 = this.m_radius * this.m_radius;
      var l2 = l * l;
      var area =
        r2 * (Math.asin(l / this.m_radius) + Math.PI / 2) +
        l * Math.sqrt(r2 - l2);
      var com = ((-2 / 3) * Math.pow(r2 - l2, 1.5)) / area;
      c.x = p.x + normal.x * com;
      c.y = p.y + normal.y * com;
      return area;
    };
    b2CircleShape.prototype.GetLocalPosition = function () {
      return this.m_p;
    };
    b2CircleShape.prototype.SetLocalPosition = function (position) {
      this.m_p.SetV(position);
    };
    b2CircleShape.prototype.GetRadius = function () {
      return this.m_radius;
    };
    b2CircleShape.prototype.SetRadius = function (radius) {
      if (radius === undefined) radius = 0;
      this.m_radius = radius;
    };
    b2CircleShape.prototype.b2CircleShape = function (radius) {
      if (radius === undefined) radius = 0;
      this.__super.b2Shape.call(this);
      this.m_type = b2Shape.e_circleShape;
      this.m_radius = radius;
    };
    b2EdgeChainDef.b2EdgeChainDef = function () {};
    b2EdgeChainDef.prototype.b2EdgeChainDef = function () {
      this.vertexCount = 0;
      this.isALoop = true;
      this.vertices = [];
    };
    Box2D.inherit(b2EdgeShape, Box2D.Collision.Shapes.b2Shape);
    b2EdgeShape.prototype.__super = Box2D.Collision.Shapes.b2Shape.prototype;
    b2EdgeShape.b2EdgeShape = function () {
      Box2D.Collision.Shapes.b2Shape.b2Shape.apply(this, arguments);
      this.s_supportVec = new b2Vec2();
      this.m_v1 = new b2Vec2();
      this.m_v2 = new b2Vec2();
      this.m_coreV1 = new b2Vec2();
      this.m_coreV2 = new b2Vec2();
      this.m_normal = new b2Vec2();
      this.m_direction = new b2Vec2();
      this.m_cornerDir1 = new b2Vec2();
      this.m_cornerDir2 = new b2Vec2();
    };
    b2EdgeShape.prototype.TestPoint = function (transform, p) {
      return false;
    };
    b2EdgeShape.prototype.RayCast = function (output, input, transform) {
      var tMat;
      var rX = input.p2.x - input.p1.x;
      var rY = input.p2.y - input.p1.y;
      tMat = transform.R;
      var v1X =
        transform.position.x +
        (tMat.col1.x * this.m_v1.x + tMat.col2.x * this.m_v1.y);
      var v1Y =
        transform.position.y +
        (tMat.col1.y * this.m_v1.x + tMat.col2.y * this.m_v1.y);
      var nX =
        transform.position.y +
        (tMat.col1.y * this.m_v2.x + tMat.col2.y * this.m_v2.y) -
        v1Y;
      var nY = -(
        transform.position.x +
        (tMat.col1.x * this.m_v2.x + tMat.col2.x * this.m_v2.y) -
        v1X
      );
      var k_slop = 100.0 * Number.MIN_VALUE;
      var denom = -(rX * nX + rY * nY);
      if (denom > k_slop) {
        var bX = input.p1.x - v1X;
        var bY = input.p1.y - v1Y;
        var a = bX * nX + bY * nY;
        if (0.0 <= a && a <= input.maxFraction * denom) {
          var mu2 = -rX * bY + rY * bX;
          if (-k_slop * denom <= mu2 && mu2 <= denom * (1.0 + k_slop)) {
            a /= denom;
            output.fraction = a;
            var nLen = Math.sqrt(nX * nX + nY * nY);
            output.normal.x = nX / nLen;
            output.normal.y = nY / nLen;
            return true;
          }
        }
      }
      return false;
    };
    b2EdgeShape.prototype.ComputeAABB = function (aabb, transform) {
      var tMat = transform.R;
      var v1X =
        transform.position.x +
        (tMat.col1.x * this.m_v1.x + tMat.col2.x * this.m_v1.y);
      var v1Y =
        transform.position.y +
        (tMat.col1.y * this.m_v1.x + tMat.col2.y * this.m_v1.y);
      var v2X =
        transform.position.x +
        (tMat.col1.x * this.m_v2.x + tMat.col2.x * this.m_v2.y);
      var v2Y =
        transform.position.y +
        (tMat.col1.y * this.m_v2.x + tMat.col2.y * this.m_v2.y);
      if (v1X < v2X) {
        aabb.lowerBound.x = v1X;
        aabb.upperBound.x = v2X;
      } else {
        aabb.lowerBound.x = v2X;
        aabb.upperBound.x = v1X;
      }
      if (v1Y < v2Y) {
        aabb.lowerBound.y = v1Y;
        aabb.upperBound.y = v2Y;
      } else {
        aabb.lowerBound.y = v2Y;
        aabb.upperBound.y = v1Y;
      }
    };
    b2EdgeShape.prototype.ComputeMass = function (massData, density) {
      if (density === undefined) density = 0;
      massData.mass = 0;
      massData.center.SetV(this.m_v1);
      massData.I = 0;
    };
    b2EdgeShape.prototype.ComputeSubmergedArea = function (
      normal,
      offset,
      xf,
      c
    ) {
      if (offset === undefined) offset = 0;
      var v0 = new b2Vec2(normal.x * offset, normal.y * offset);
      var v1 = b2Math.MulX(xf, this.m_v1);
      var v2 = b2Math.MulX(xf, this.m_v2);
      var d1 = b2Math.Dot(normal, v1) - offset;
      var d2 = b2Math.Dot(normal, v2) - offset;
      if (d1 > 0) {
        if (d2 > 0) {
          return 0;
        } else {
          v1.x = (-d2 / (d1 - d2)) * v1.x + (d1 / (d1 - d2)) * v2.x;
          v1.y = (-d2 / (d1 - d2)) * v1.y + (d1 / (d1 - d2)) * v2.y;
        }
      } else {
        if (d2 > 0) {
          v2.x = (-d2 / (d1 - d2)) * v1.x + (d1 / (d1 - d2)) * v2.x;
          v2.y = (-d2 / (d1 - d2)) * v1.y + (d1 / (d1 - d2)) * v2.y;
        } else {
        }
      }
      c.x = (v0.x + v1.x + v2.x) / 3;
      c.y = (v0.y + v1.y + v2.y) / 3;
      return (
        0.5 * ((v1.x - v0.x) * (v2.y - v0.y) - (v1.y - v0.y) * (v2.x - v0.x))
      );
    };
    b2EdgeShape.prototype.GetLength = function () {
      return this.m_length;
    };
    b2EdgeShape.prototype.GetVertex1 = function () {
      return this.m_v1;
    };
    b2EdgeShape.prototype.GetVertex2 = function () {
      return this.m_v2;
    };
    b2EdgeShape.prototype.GetCoreVertex1 = function () {
      return this.m_coreV1;
    };
    b2EdgeShape.prototype.GetCoreVertex2 = function () {
      return this.m_coreV2;
    };
    b2EdgeShape.prototype.GetNormalVector = function () {
      return this.m_normal;
    };
    b2EdgeShape.prototype.GetDirectionVector = function () {
      return this.m_direction;
    };
    b2EdgeShape.prototype.GetCorner1Vector = function () {
      return this.m_cornerDir1;
    };
    b2EdgeShape.prototype.GetCorner2Vector = function () {
      return this.m_cornerDir2;
    };
    b2EdgeShape.prototype.Corner1IsConvex = function () {
      return this.m_cornerConvex1;
    };
    b2EdgeShape.prototype.Corner2IsConvex = function () {
      return this.m_cornerConvex2;
    };
    b2EdgeShape.prototype.GetFirstVertex = function (xf) {
      var tMat = xf.R;
      return new b2Vec2(
        xf.position.x +
          (tMat.col1.x * this.m_coreV1.x + tMat.col2.x * this.m_coreV1.y),
        xf.position.y +
          (tMat.col1.y * this.m_coreV1.x + tMat.col2.y * this.m_coreV1.y)
      );
    };
    b2EdgeShape.prototype.GetNextEdge = function () {
      return this.m_nextEdge;
    };
    b2EdgeShape.prototype.GetPrevEdge = function () {
      return this.m_prevEdge;
    };
    b2EdgeShape.prototype.Support = function (xf, dX, dY) {
      if (dX === undefined) dX = 0;
      if (dY === undefined) dY = 0;
      var tMat = xf.R;
      var v1X =
        xf.position.x +
        (tMat.col1.x * this.m_coreV1.x + tMat.col2.x * this.m_coreV1.y);
      var v1Y =
        xf.position.y +
        (tMat.col1.y * this.m_coreV1.x + tMat.col2.y * this.m_coreV1.y);
      var v2X =
        xf.position.x +
        (tMat.col1.x * this.m_coreV2.x + tMat.col2.x * this.m_coreV2.y);
      var v2Y =
        xf.position.y +
        (tMat.col1.y * this.m_coreV2.x + tMat.col2.y * this.m_coreV2.y);
      if (v1X * dX + v1Y * dY > v2X * dX + v2Y * dY) {
        this.s_supportVec.x = v1X;
        this.s_supportVec.y = v1Y;
      } else {
        this.s_supportVec.x = v2X;
        this.s_supportVec.y = v2Y;
      }
      return this.s_supportVec;
    };
    b2EdgeShape.prototype.b2EdgeShape = function (v1, v2) {
      this.__super.b2Shape.call(this);
      this.m_type = b2Shape.e_edgeShape;
      this.m_prevEdge = null;
      this.m_nextEdge = null;
      this.m_v1 = v1;
      this.m_v2 = v2;
      this.m_direction.Set(
        this.m_v2.x - this.m_v1.x,
        this.m_v2.y - this.m_v1.y
      );
      this.m_length = this.m_direction.Normalize();
      this.m_normal.Set(this.m_direction.y, -this.m_direction.x);
      this.m_coreV1.Set(
        -b2Settings.b2_toiSlop * (this.m_normal.x - this.m_direction.x) +
          this.m_v1.x,
        -b2Settings.b2_toiSlop * (this.m_normal.y - this.m_direction.y) +
          this.m_v1.y
      );
      this.m_coreV2.Set(
        -b2Settings.b2_toiSlop * (this.m_normal.x + this.m_direction.x) +
          this.m_v2.x,
        -b2Settings.b2_toiSlop * (this.m_normal.y + this.m_direction.y) +
          this.m_v2.y
      );
      this.m_cornerDir1 = this.m_normal;
      this.m_cornerDir2.Set(-this.m_normal.x, -this.m_normal.y);
    };
    b2EdgeShape.prototype.SetPrevEdge = function (
      edge,
      core,
      cornerDir,
      convex
    ) {
      this.m_prevEdge = edge;
      this.m_coreV1 = core;
      this.m_cornerDir1 = cornerDir;
      this.m_cornerConvex1 = convex;
    };
    b2EdgeShape.prototype.SetNextEdge = function (
      edge,
      core,
      cornerDir,
      convex
    ) {
      this.m_nextEdge = edge;
      this.m_coreV2 = core;
      this.m_cornerDir2 = cornerDir;
      this.m_cornerConvex2 = convex;
    };
    b2MassData.b2MassData = function () {
      this.mass = 0.0;
      this.center = new b2Vec2(0, 0);
      this.I = 0.0;
    };
    Box2D.inherit(b2PolygonShape, Box2D.Collision.Shapes.b2Shape);
    b2PolygonShape.prototype.__super = Box2D.Collision.Shapes.b2Shape.prototype;
    b2PolygonShape.b2PolygonShape = function () {
      Box2D.Collision.Shapes.b2Shape.b2Shape.apply(this, arguments);
    };
    b2PolygonShape.prototype.Copy = function () {
      var s = new b2PolygonShape();
      s.Set(this);
      return s;
    };
    b2PolygonShape.prototype.Set = function (other) {
      this.__super.Set.call(this, other);
      if (Box2D.is(other, b2PolygonShape)) {
        var other2 = other instanceof b2PolygonShape ? other : null;
        this.m_centroid.SetV(other2.m_centroid);
        this.m_vertexCount = other2.m_vertexCount;
        this.Reserve(this.m_vertexCount);
        for (var i = 0; i < this.m_vertexCount; i++) {
          this.m_vertices[i].SetV(other2.m_vertices[i]);
          this.m_normals[i].SetV(other2.m_normals[i]);
        }
      }
    };
    b2PolygonShape.prototype.SetAsArray = function (vertices, vertexCount) {
      if (vertexCount === undefined) vertexCount = 0;
      var v = new Vector();
      var i = 0,
        tVec;
      for (i = 0; i < vertices.length; ++i) {
        tVec = vertices[i];
        v.push(tVec);
      }
      this.SetAsVector(v, vertexCount);
    };
    b2PolygonShape.AsArray = function (vertices, vertexCount) {
      if (vertexCount === undefined) vertexCount = 0;
      var polygonShape = new b2PolygonShape();
      polygonShape.SetAsArray(vertices, vertexCount);
      return polygonShape;
    };
    b2PolygonShape.prototype.SetAsVector = function (vertices, vertexCount) {
      if (vertexCount === undefined) vertexCount = 0;
      if (vertexCount == 0) vertexCount = vertices.length;
      b2Settings.b2Assert(2 <= vertexCount);
      this.m_vertexCount = vertexCount;
      this.Reserve(vertexCount);
      var i = 0;
      for (i = 0; i < this.m_vertexCount; i++) {
        this.m_vertices[i].SetV(vertices[i]);
      }
      for (i = 0; i < this.m_vertexCount; ++i) {
        var i1 = parseInt(i);
        var i2 = parseInt(i + 1 < this.m_vertexCount ? i + 1 : 0);
        var edge = b2Math.SubtractVV(this.m_vertices[i2], this.m_vertices[i1]);
        b2Settings.b2Assert(edge.LengthSquared() > Number.MIN_VALUE);
        this.m_normals[i].SetV(b2Math.CrossVF(edge, 1.0));
        this.m_normals[i].Normalize();
      }
      this.m_centroid = b2PolygonShape.ComputeCentroid(
        this.m_vertices,
        this.m_vertexCount
      );
    };
    b2PolygonShape.AsVector = function (vertices, vertexCount) {
      if (vertexCount === undefined) vertexCount = 0;
      var polygonShape = new b2PolygonShape();
      polygonShape.SetAsVector(vertices, vertexCount);
      return polygonShape;
    };
    b2PolygonShape.prototype.SetAsBox = function (hx, hy) {
      if (hx === undefined) hx = 0;
      if (hy === undefined) hy = 0;
      this.m_vertexCount = 4;
      this.Reserve(4);
      this.m_vertices[0].Set(-hx, -hy);
      this.m_vertices[1].Set(hx, -hy);
      this.m_vertices[2].Set(hx, hy);
      this.m_vertices[3].Set(-hx, hy);
      this.m_normals[0].Set(0.0, -1.0);
      this.m_normals[1].Set(1.0, 0.0);
      this.m_normals[2].Set(0.0, 1.0);
      this.m_normals[3].Set(-1.0, 0.0);
      this.m_centroid.SetZero();
    };
    b2PolygonShape.AsBox = function (hx, hy) {
      if (hx === undefined) hx = 0;
      if (hy === undefined) hy = 0;
      var polygonShape = new b2PolygonShape();
      polygonShape.SetAsBox(hx, hy);
      return polygonShape;
    };
    b2PolygonShape.prototype.SetAsOrientedBox = function (
      hx,
      hy,
      center,
      angle
    ) {
      if (hx === undefined) hx = 0;
      if (hy === undefined) hy = 0;
      if (center === undefined) center = null;
      if (angle === undefined) angle = 0.0;
      this.m_vertexCount = 4;
      this.Reserve(4);
      this.m_vertices[0].Set(-hx, -hy);
      this.m_vertices[1].Set(hx, -hy);
      this.m_vertices[2].Set(hx, hy);
      this.m_vertices[3].Set(-hx, hy);
      this.m_normals[0].Set(0.0, -1.0);
      this.m_normals[1].Set(1.0, 0.0);
      this.m_normals[2].Set(0.0, 1.0);
      this.m_normals[3].Set(-1.0, 0.0);
      this.m_centroid = center;
      var xf = new b2Transform();
      xf.position = center;
      xf.R.Set(angle);
      for (var i = 0; i < this.m_vertexCount; ++i) {
        this.m_vertices[i] = b2Math.MulX(xf, this.m_vertices[i]);
        this.m_normals[i] = b2Math.MulMV(xf.R, this.m_normals[i]);
      }
    };
    b2PolygonShape.AsOrientedBox = function (hx, hy, center, angle) {
      if (hx === undefined) hx = 0;
      if (hy === undefined) hy = 0;
      if (center === undefined) center = null;
      if (angle === undefined) angle = 0.0;
      var polygonShape = new b2PolygonShape();
      polygonShape.SetAsOrientedBox(hx, hy, center, angle);
      return polygonShape;
    };
    b2PolygonShape.prototype.SetAsEdge = function (v1, v2) {
      this.m_vertexCount = 2;
      this.Reserve(2);
      this.m_vertices[0].SetV(v1);
      this.m_vertices[1].SetV(v2);
      this.m_centroid.x = 0.5 * (v1.x + v2.x);
      this.m_centroid.y = 0.5 * (v1.y + v2.y);
      this.m_normals[0] = b2Math.CrossVF(b2Math.SubtractVV(v2, v1), 1.0);
      this.m_normals[0].Normalize();
      this.m_normals[1].x = -this.m_normals[0].x;
      this.m_normals[1].y = -this.m_normals[0].y;
    };
    b2PolygonShape.AsEdge = function (v1, v2) {
      var polygonShape = new b2PolygonShape();
      polygonShape.SetAsEdge(v1, v2);
      return polygonShape;
    };
    b2PolygonShape.prototype.TestPoint = function (xf, p) {
      var tVec;
      var tMat = xf.R;
      var tX = p.x - xf.position.x;
      var tY = p.y - xf.position.y;
      var pLocalX = tX * tMat.col1.x + tY * tMat.col1.y;
      var pLocalY = tX * tMat.col2.x + tY * tMat.col2.y;
      for (var i = 0; i < this.m_vertexCount; ++i) {
        tVec = this.m_vertices[i];
        tX = pLocalX - tVec.x;
        tY = pLocalY - tVec.y;
        tVec = this.m_normals[i];
        var dot = tVec.x * tX + tVec.y * tY;
        if (dot > 0.0) {
          return false;
        }
      }
      return true;
    };
    b2PolygonShape.prototype.RayCast = function (output, input, transform) {
      var lower = 0.0;
      var upper = input.maxFraction;
      var tX = 0;
      var tY = 0;
      var tMat;
      var tVec;
      tX = input.p1.x - transform.position.x;
      tY = input.p1.y - transform.position.y;
      tMat = transform.R;
      var p1X = tX * tMat.col1.x + tY * tMat.col1.y;
      var p1Y = tX * tMat.col2.x + tY * tMat.col2.y;
      tX = input.p2.x - transform.position.x;
      tY = input.p2.y - transform.position.y;
      tMat = transform.R;
      var p2X = tX * tMat.col1.x + tY * tMat.col1.y;
      var p2Y = tX * tMat.col2.x + tY * tMat.col2.y;
      var dX = p2X - p1X;
      var dY = p2Y - p1Y;
      var index = parseInt(-1);
      for (var i = 0; i < this.m_vertexCount; ++i) {
        tVec = this.m_vertices[i];
        tX = tVec.x - p1X;
        tY = tVec.y - p1Y;
        tVec = this.m_normals[i];
        var numerator = tVec.x * tX + tVec.y * tY;
        var denominator = tVec.x * dX + tVec.y * dY;
        if (denominator == 0.0) {
          if (numerator < 0.0) {
            return false;
          }
        } else {
          if (denominator < 0.0 && numerator < lower * denominator) {
            lower = numerator / denominator;
            index = i;
          } else if (denominator > 0.0 && numerator < upper * denominator) {
            upper = numerator / denominator;
          }
        }
        if (upper < lower - Number.MIN_VALUE) {
          return false;
        }
      }
      if (index >= 0) {
        output.fraction = lower;
        tMat = transform.R;
        tVec = this.m_normals[index];
        output.normal.x = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
        output.normal.y = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
        return true;
      }
      return false;
    };
    b2PolygonShape.prototype.ComputeAABB = function (aabb, xf) {
      var tMat = xf.R;
      var tVec = this.m_vertices[0];
      var lowerX =
        xf.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      var lowerY =
        xf.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      var upperX = lowerX;
      var upperY = lowerY;
      for (var i = 1; i < this.m_vertexCount; ++i) {
        tVec = this.m_vertices[i];
        var vX = xf.position.x + (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
        var vY = xf.position.y + (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
        lowerX = lowerX < vX ? lowerX : vX;
        lowerY = lowerY < vY ? lowerY : vY;
        upperX = upperX > vX ? upperX : vX;
        upperY = upperY > vY ? upperY : vY;
      }
      aabb.lowerBound.x = lowerX - this.m_radius;
      aabb.lowerBound.y = lowerY - this.m_radius;
      aabb.upperBound.x = upperX + this.m_radius;
      aabb.upperBound.y = upperY + this.m_radius;
    };
    b2PolygonShape.prototype.ComputeMass = function (massData, density) {
      if (density === undefined) density = 0;
      if (this.m_vertexCount == 2) {
        massData.center.x = 0.5 * (this.m_vertices[0].x + this.m_vertices[1].x);
        massData.center.y = 0.5 * (this.m_vertices[0].y + this.m_vertices[1].y);
        massData.mass = 0.0;
        massData.I = 0.0;
        return;
      }
      var centerX = 0.0;
      var centerY = 0.0;
      var area = 0.0;
      var I = 0.0;
      var p1X = 0.0;
      var p1Y = 0.0;
      var k_inv3 = 1.0 / 3.0;
      for (var i = 0; i < this.m_vertexCount; ++i) {
        var p2 = this.m_vertices[i];
        var p3 =
          i + 1 < this.m_vertexCount
            ? this.m_vertices[parseInt(i + 1)]
            : this.m_vertices[0];
        var e1X = p2.x - p1X;
        var e1Y = p2.y - p1Y;
        var e2X = p3.x - p1X;
        var e2Y = p3.y - p1Y;
        var D = e1X * e2Y - e1Y * e2X;
        var triangleArea = 0.5 * D;
        area += triangleArea;
        centerX += triangleArea * k_inv3 * (p1X + p2.x + p3.x);
        centerY += triangleArea * k_inv3 * (p1Y + p2.y + p3.y);
        var px = p1X;
        var py = p1Y;
        var ex1 = e1X;
        var ey1 = e1Y;
        var ex2 = e2X;
        var ey2 = e2Y;
        var intx2 =
          k_inv3 *
            (0.25 * (ex1 * ex1 + ex2 * ex1 + ex2 * ex2) +
              (px * ex1 + px * ex2)) +
          0.5 * px * px;
        var inty2 =
          k_inv3 *
            (0.25 * (ey1 * ey1 + ey2 * ey1 + ey2 * ey2) +
              (py * ey1 + py * ey2)) +
          0.5 * py * py;
        I += D * (intx2 + inty2);
      }
      massData.mass = density * area;
      centerX *= 1.0 / area;
      centerY *= 1.0 / area;
      massData.center.Set(centerX, centerY);
      massData.I = density * I;
    };
    b2PolygonShape.prototype.ComputeSubmergedArea = function (
      normal,
      offset,
      xf,
      c
    ) {
      if (offset === undefined) offset = 0;
      var normalL = b2Math.MulTMV(xf.R, normal);
      var offsetL = offset - b2Math.Dot(normal, xf.position);
      var depths = new Vector_a2j_Number();
      var diveCount = 0;
      var intoIndex = parseInt(-1);
      var outoIndex = parseInt(-1);
      var lastSubmerged = false;
      var i = 0;
      for (i = 0; i < this.m_vertexCount; ++i) {
        depths[i] = b2Math.Dot(normalL, this.m_vertices[i]) - offsetL;
        var isSubmerged = depths[i] < -Number.MIN_VALUE;
        if (i > 0) {
          if (isSubmerged) {
            if (!lastSubmerged) {
              intoIndex = i - 1;
              diveCount++;
            }
          } else {
            if (lastSubmerged) {
              outoIndex = i - 1;
              diveCount++;
            }
          }
        }
        lastSubmerged = isSubmerged;
      }
      switch (diveCount) {
        case 0:
          if (lastSubmerged) {
            var md = new b2MassData();
            this.ComputeMass(md, 1);
            c.SetV(b2Math.MulX(xf, md.center));
            return md.mass;
          } else {
            return 0;
          }
          break;
        case 1:
          if (intoIndex == -1) {
            intoIndex = this.m_vertexCount - 1;
          } else {
            outoIndex = this.m_vertexCount - 1;
          }
          break;
      }
      var intoIndex2 = parseInt((intoIndex + 1) % this.m_vertexCount);
      var outoIndex2 = parseInt((outoIndex + 1) % this.m_vertexCount);
      var intoLamdda =
        (0 - depths[intoIndex]) / (depths[intoIndex2] - depths[intoIndex]);
      var outoLamdda =
        (0 - depths[outoIndex]) / (depths[outoIndex2] - depths[outoIndex]);
      var intoVec = new b2Vec2(
        this.m_vertices[intoIndex].x * (1 - intoLamdda) +
          this.m_vertices[intoIndex2].x * intoLamdda,
        this.m_vertices[intoIndex].y * (1 - intoLamdda) +
          this.m_vertices[intoIndex2].y * intoLamdda
      );
      var outoVec = new b2Vec2(
        this.m_vertices[outoIndex].x * (1 - outoLamdda) +
          this.m_vertices[outoIndex2].x * outoLamdda,
        this.m_vertices[outoIndex].y * (1 - outoLamdda) +
          this.m_vertices[outoIndex2].y * outoLamdda
      );
      var area = 0;
      var center = new b2Vec2();
      var p2 = this.m_vertices[intoIndex2];
      var p3;
      i = intoIndex2;
      while (i != outoIndex2) {
        i = (i + 1) % this.m_vertexCount;
        if (i == outoIndex2) p3 = outoVec;
        else p3 = this.m_vertices[i];
        var triangleArea =
          0.5 *
          ((p2.x - intoVec.x) * (p3.y - intoVec.y) -
            (p2.y - intoVec.y) * (p3.x - intoVec.x));
        area += triangleArea;
        center.x += (triangleArea * (intoVec.x + p2.x + p3.x)) / 3;
        center.y += (triangleArea * (intoVec.y + p2.y + p3.y)) / 3;
        p2 = p3;
      }
      center.Multiply(1 / area);
      c.SetV(b2Math.MulX(xf, center));
      return area;
    };
    b2PolygonShape.prototype.GetVertexCount = function () {
      return this.m_vertexCount;
    };
    b2PolygonShape.prototype.GetVertices = function () {
      return this.m_vertices;
    };
    b2PolygonShape.prototype.GetNormals = function () {
      return this.m_normals;
    };
    b2PolygonShape.prototype.GetSupport = function (d) {
      var bestIndex = 0;
      var bestValue = this.m_vertices[0].x * d.x + this.m_vertices[0].y * d.y;
      for (var i = 1; i < this.m_vertexCount; ++i) {
        var value = this.m_vertices[i].x * d.x + this.m_vertices[i].y * d.y;
        if (value > bestValue) {
          bestIndex = i;
          bestValue = value;
        }
      }
      return bestIndex;
    };
    b2PolygonShape.prototype.GetSupportVertex = function (d) {
      var bestIndex = 0;
      var bestValue = this.m_vertices[0].x * d.x + this.m_vertices[0].y * d.y;
      for (var i = 1; i < this.m_vertexCount; ++i) {
        var value = this.m_vertices[i].x * d.x + this.m_vertices[i].y * d.y;
        if (value > bestValue) {
          bestIndex = i;
          bestValue = value;
        }
      }
      return this.m_vertices[bestIndex];
    };
    b2PolygonShape.prototype.Validate = function () {
      return false;
    };
    b2PolygonShape.prototype.b2PolygonShape = function () {
      this.__super.b2Shape.call(this);
      this.m_type = b2Shape.e_polygonShape;
      this.m_centroid = new b2Vec2();
      this.m_vertices = new Vector();
      this.m_normals = new Vector();
    };
    b2PolygonShape.prototype.Reserve = function (count) {
      if (count === undefined) count = 0;
      for (var i = parseInt(this.m_vertices.length); i < count; i++) {
        this.m_vertices[i] = new b2Vec2();
        this.m_normals[i] = new b2Vec2();
      }
    };
    b2PolygonShape.ComputeCentroid = function (vs, count) {
      if (count === undefined) count = 0;
      var c = new b2Vec2();
      var area = 0.0;
      var p1X = 0.0;
      var p1Y = 0.0;
      var inv3 = 1.0 / 3.0;
      for (var i = 0; i < count; ++i) {
        var p2 = vs[i];
        var p3 = i + 1 < count ? vs[parseInt(i + 1)] : vs[0];
        var e1X = p2.x - p1X;
        var e1Y = p2.y - p1Y;
        var e2X = p3.x - p1X;
        var e2Y = p3.y - p1Y;
        var D = e1X * e2Y - e1Y * e2X;
        var triangleArea = 0.5 * D;
        area += triangleArea;
        c.x += triangleArea * inv3 * (p1X + p2.x + p3.x);
        c.y += triangleArea * inv3 * (p1Y + p2.y + p3.y);
      }
      c.x *= 1.0 / area;
      c.y *= 1.0 / area;
      return c;
    };
    b2PolygonShape.ComputeOBB = function (obb, vs, count) {
      if (count === undefined) count = 0;
      var i = 0;
      var p = new Vector(count + 1);
      for (i = 0; i < count; ++i) {
        p[i] = vs[i];
      }
      p[count] = p[0];
      var minArea = Number.MAX_VALUE;
      for (i = 1; i <= count; ++i) {
        var root = p[parseInt(i - 1)];
        var uxX = p[i].x - root.x;
        var uxY = p[i].y - root.y;
        var length = Math.sqrt(uxX * uxX + uxY * uxY);
        uxX /= length;
        uxY /= length;
        var uyX = -uxY;
        var uyY = uxX;
        var lowerX = Number.MAX_VALUE;
        var lowerY = Number.MAX_VALUE;
        var upperX = -Number.MAX_VALUE;
        var upperY = -Number.MAX_VALUE;
        for (var j = 0; j < count; ++j) {
          var dX = p[j].x - root.x;
          var dY = p[j].y - root.y;
          var rX = uxX * dX + uxY * dY;
          var rY = uyX * dX + uyY * dY;
          if (rX < lowerX) lowerX = rX;
          if (rY < lowerY) lowerY = rY;
          if (rX > upperX) upperX = rX;
          if (rY > upperY) upperY = rY;
        }
        var area = (upperX - lowerX) * (upperY - lowerY);
        if (area < 0.95 * minArea) {
          minArea = area;
          obb.R.col1.x = uxX;
          obb.R.col1.y = uxY;
          obb.R.col2.x = uyX;
          obb.R.col2.y = uyY;
          var centerX = 0.5 * (lowerX + upperX);
          var centerY = 0.5 * (lowerY + upperY);
          var tMat = obb.R;
          obb.center.x =
            root.x + (tMat.col1.x * centerX + tMat.col2.x * centerY);
          obb.center.y =
            root.y + (tMat.col1.y * centerX + tMat.col2.y * centerY);
          obb.extents.x = 0.5 * (upperX - lowerX);
          obb.extents.y = 0.5 * (upperY - lowerY);
        }
      }
    };
    Box2D.postDefs.push(function () {
      Box2D.Collision.Shapes.b2PolygonShape.s_mat = new b2Mat22();
    });
    b2Shape.b2Shape = function () {};
    b2Shape.prototype.Copy = function () {
      return null;
    };
    b2Shape.prototype.Set = function (other) {
      this.m_radius = other.m_radius;
    };
    b2Shape.prototype.GetType = function () {
      return this.m_type;
    };
    b2Shape.prototype.TestPoint = function (xf, p) {
      return false;
    };
    b2Shape.prototype.RayCast = function (output, input, transform) {
      return false;
    };
    b2Shape.prototype.ComputeAABB = function (aabb, xf) {};
    b2Shape.prototype.ComputeMass = function (massData, density) {
      if (density === undefined) density = 0;
    };
    b2Shape.prototype.ComputeSubmergedArea = function (normal, offset, xf, c) {
      if (offset === undefined) offset = 0;
      return 0;
    };
    b2Shape.TestOverlap = function (shape1, transform1, shape2, transform2) {
      var input = new b2DistanceInput();
      input.proxyA = new b2DistanceProxy();
      input.proxyA.Set(shape1);
      input.proxyB = new b2DistanceProxy();
      input.proxyB.Set(shape2);
      input.transformA = transform1;
      input.transformB = transform2;
      input.useRadii = true;
      var simplexCache = new b2SimplexCache();
      simplexCache.count = 0;
      var output = new b2DistanceOutput();
      b2Distance.Distance(output, simplexCache, input);
      return output.distance < 10.0 * Number.MIN_VALUE;
    };
    b2Shape.prototype.b2Shape = function () {
      this.m_type = b2Shape.e_unknownShape;
      this.m_radius = b2Settings.b2_linearSlop;
    };
    Box2D.postDefs.push(function () {
      Box2D.Collision.Shapes.b2Shape.e_unknownShape = parseInt(-1);
      Box2D.Collision.Shapes.b2Shape.e_circleShape = 0;
      Box2D.Collision.Shapes.b2Shape.e_polygonShape = 1;
      Box2D.Collision.Shapes.b2Shape.e_edgeShape = 2;
      Box2D.Collision.Shapes.b2Shape.e_shapeTypeCount = 3;
      Box2D.Collision.Shapes.b2Shape.e_hitCollide = 1;
      Box2D.Collision.Shapes.b2Shape.e_missCollide = 0;
      Box2D.Collision.Shapes.b2Shape.e_startsInsideCollide = parseInt(-1);
    });
  })();
  (function () {
    var b2Color = Box2D.Common.b2Color,
      b2internal = Box2D.Common.b2internal,
      b2Settings = Box2D.Common.b2Settings,
      b2Mat22 = Box2D.Common.Math.b2Mat22,
      b2Mat33 = Box2D.Common.Math.b2Mat33,
      b2Math = Box2D.Common.Math.b2Math,
      b2Sweep = Box2D.Common.Math.b2Sweep,
      b2Transform = Box2D.Common.Math.b2Transform,
      b2Vec2 = Box2D.Common.Math.b2Vec2,
      b2Vec3 = Box2D.Common.Math.b2Vec3;

    b2Color.b2Color = function () {
      this._r = 0;
      this._g = 0;
      this._b = 0;
    };
    b2Color.prototype.b2Color = function (rr, gg, bb) {
      if (rr === undefined) rr = 0;
      if (gg === undefined) gg = 0;
      if (bb === undefined) bb = 0;
      this._r = Box2D.parseUInt(255 * b2Math.Clamp(rr, 0.0, 1.0));
      this._g = Box2D.parseUInt(255 * b2Math.Clamp(gg, 0.0, 1.0));
      this._b = Box2D.parseUInt(255 * b2Math.Clamp(bb, 0.0, 1.0));
    };
    b2Color.prototype.Set = function (rr, gg, bb) {
      if (rr === undefined) rr = 0;
      if (gg === undefined) gg = 0;
      if (bb === undefined) bb = 0;
      this._r = Box2D.parseUInt(255 * b2Math.Clamp(rr, 0.0, 1.0));
      this._g = Box2D.parseUInt(255 * b2Math.Clamp(gg, 0.0, 1.0));
      this._b = Box2D.parseUInt(255 * b2Math.Clamp(bb, 0.0, 1.0));
    };
    Object.defineProperty(b2Color.prototype, "r", {
      enumerable: false,
      configurable: true,
      set: function (rr) {
        if (rr === undefined) rr = 0;
        this._r = Box2D.parseUInt(255 * b2Math.Clamp(rr, 0.0, 1.0));
      },
    });
    Object.defineProperty(b2Color.prototype, "g", {
      enumerable: false,
      configurable: true,
      set: function (gg) {
        if (gg === undefined) gg = 0;
        this._g = Box2D.parseUInt(255 * b2Math.Clamp(gg, 0.0, 1.0));
      },
    });
    Object.defineProperty(b2Color.prototype, "b", {
      enumerable: false,
      configurable: true,
      set: function (bb) {
        if (bb === undefined) bb = 0;
        this._b = Box2D.parseUInt(255 * b2Math.Clamp(bb, 0.0, 1.0));
      },
    });
    Object.defineProperty(b2Color.prototype, "color", {
      enumerable: false,
      configurable: true,
      get: function () {
        return (this._r << 16) | (this._g << 8) | this._b;
      },
    });
    b2Settings.b2Settings = function () {};
    b2Settings.b2MixFriction = function (friction1, friction2) {
      if (friction1 === undefined) friction1 = 0;
      if (friction2 === undefined) friction2 = 0;
      return Math.sqrt(friction1 * friction2);
    };
    b2Settings.b2MixRestitution = function (restitution1, restitution2) {
      if (restitution1 === undefined) restitution1 = 0;
      if (restitution2 === undefined) restitution2 = 0;
      return restitution1 > restitution2 ? restitution1 : restitution2;
    };
    b2Settings.b2Assert = function (a) {
      if (!a) {
        throw "Assertion Failed";
      }
    };
    Box2D.postDefs.push(function () {
      Box2D.Common.b2Settings.VERSION = "2.1alpha";
      Box2D.Common.b2Settings.USHRT_MAX = 0x0000ffff;
      Box2D.Common.b2Settings.b2_pi = Math.PI;
      Box2D.Common.b2Settings.b2_maxManifoldPoints = 2;
      Box2D.Common.b2Settings.b2_aabbExtension = 0.1;
      Box2D.Common.b2Settings.b2_aabbMultiplier = 2.0;
      Box2D.Common.b2Settings.b2_polygonRadius = 2.0 * b2Settings.b2_linearSlop;
      Box2D.Common.b2Settings.b2_linearSlop = 0.005;
      Box2D.Common.b2Settings.b2_angularSlop = (2.0 / 180.0) * b2Settings.b2_pi;
      Box2D.Common.b2Settings.b2_toiSlop = 8.0 * b2Settings.b2_linearSlop;
      Box2D.Common.b2Settings.b2_maxTOIContactsPerIsland = 32;
      Box2D.Common.b2Settings.b2_maxTOIJointsPerIsland = 32;
      Box2D.Common.b2Settings.b2_velocityThreshold = 1.0;
      Box2D.Common.b2Settings.b2_maxLinearCorrection = 0.2;
      Box2D.Common.b2Settings.b2_maxAngularCorrection =
        (8.0 / 180.0) * b2Settings.b2_pi;
      Box2D.Common.b2Settings.b2_maxTranslation = 2.0;
      Box2D.Common.b2Settings.b2_maxTranslationSquared =
        b2Settings.b2_maxTranslation * b2Settings.b2_maxTranslation;
      Box2D.Common.b2Settings.b2_maxRotation = 0.5 * b2Settings.b2_pi;
      Box2D.Common.b2Settings.b2_maxRotationSquared =
        b2Settings.b2_maxRotation * b2Settings.b2_maxRotation;
      Box2D.Common.b2Settings.b2_contactBaumgarte = 0.2;
      Box2D.Common.b2Settings.b2_timeToSleep = 0.5;
      Box2D.Common.b2Settings.b2_linearSleepTolerance = 0.01;
      Box2D.Common.b2Settings.b2_angularSleepTolerance =
        (2.0 / 180.0) * b2Settings.b2_pi;
    });
  })();
  (function () {
    var b2AABB = Box2D.Collision.b2AABB,
      b2Color = Box2D.Common.b2Color,
      b2internal = Box2D.Common.b2internal,
      b2Settings = Box2D.Common.b2Settings,
      b2Mat22 = Box2D.Common.Math.b2Mat22,
      b2Mat33 = Box2D.Common.Math.b2Mat33,
      b2Math = Box2D.Common.Math.b2Math,
      b2Sweep = Box2D.Common.Math.b2Sweep,
      b2Transform = Box2D.Common.Math.b2Transform,
      b2Vec2 = Box2D.Common.Math.b2Vec2,
      b2Vec3 = Box2D.Common.Math.b2Vec3;

    b2Mat22.b2Mat22 = function () {
      this.col1 = new b2Vec2();
      this.col2 = new b2Vec2();
    };
    b2Mat22.prototype.b2Mat22 = function () {
      this.SetIdentity();
    };
    b2Mat22.FromAngle = function (angle) {
      if (angle === undefined) angle = 0;
      var mat = new b2Mat22();
      mat.Set(angle);
      return mat;
    };
    b2Mat22.FromVV = function (c1, c2) {
      var mat = new b2Mat22();
      mat.SetVV(c1, c2);
      return mat;
    };
    b2Mat22.prototype.Set = function (angle) {
      if (angle === undefined) angle = 0;
      var c = Math.cos(angle);
      var s = Math.sin(angle);
      this.col1.x = c;
      this.col2.x = -s;
      this.col1.y = s;
      this.col2.y = c;
    };
    b2Mat22.prototype.SetVV = function (c1, c2) {
      this.col1.SetV(c1);
      this.col2.SetV(c2);
    };
    b2Mat22.prototype.Copy = function () {
      var mat = new b2Mat22();
      mat.SetM(this);
      return mat;
    };
    b2Mat22.prototype.SetM = function (m) {
      this.col1.SetV(m.col1);
      this.col2.SetV(m.col2);
    };
    b2Mat22.prototype.AddM = function (m) {
      this.col1.x += m.col1.x;
      this.col1.y += m.col1.y;
      this.col2.x += m.col2.x;
      this.col2.y += m.col2.y;
    };
    b2Mat22.prototype.SetIdentity = function () {
      this.col1.x = 1.0;
      this.col2.x = 0.0;
      this.col1.y = 0.0;
      this.col2.y = 1.0;
    };
    b2Mat22.prototype.SetZero = function () {
      this.col1.x = 0.0;
      this.col2.x = 0.0;
      this.col1.y = 0.0;
      this.col2.y = 0.0;
    };
    b2Mat22.prototype.GetAngle = function () {
      return Math.atan2(this.col1.y, this.col1.x);
    };
    b2Mat22.prototype.GetInverse = function (out) {
      var a = this.col1.x;
      var b = this.col2.x;
      var c = this.col1.y;
      var d = this.col2.y;
      var det = a * d - b * c;
      if (det != 0.0) {
        det = 1.0 / det;
      }
      out.col1.x = det * d;
      out.col2.x = -det * b;
      out.col1.y = -det * c;
      out.col2.y = det * a;
      return out;
    };
    b2Mat22.prototype.Solve = function (out, bX, bY) {
      if (bX === undefined) bX = 0;
      if (bY === undefined) bY = 0;
      var a11 = this.col1.x;
      var a12 = this.col2.x;
      var a21 = this.col1.y;
      var a22 = this.col2.y;
      var det = a11 * a22 - a12 * a21;
      if (det != 0.0) {
        det = 1.0 / det;
      }
      out.x = det * (a22 * bX - a12 * bY);
      out.y = det * (a11 * bY - a21 * bX);
      return out;
    };
    b2Mat22.prototype.Abs = function () {
      this.col1.Abs();
      this.col2.Abs();
    };
    b2Mat33.b2Mat33 = function () {
      this.col1 = new b2Vec3();
      this.col2 = new b2Vec3();
      this.col3 = new b2Vec3();
    };
    b2Mat33.prototype.b2Mat33 = function (c1, c2, c3) {
      if (c1 === undefined) c1 = null;
      if (c2 === undefined) c2 = null;
      if (c3 === undefined) c3 = null;
      if (!c1 && !c2 && !c3) {
        this.col1.SetZero();
        this.col2.SetZero();
        this.col3.SetZero();
      } else {
        this.col1.SetV(c1);
        this.col2.SetV(c2);
        this.col3.SetV(c3);
      }
    };
    b2Mat33.prototype.SetVVV = function (c1, c2, c3) {
      this.col1.SetV(c1);
      this.col2.SetV(c2);
      this.col3.SetV(c3);
    };
    b2Mat33.prototype.Copy = function () {
      return new b2Mat33(this.col1, this.col2, this.col3);
    };
    b2Mat33.prototype.SetM = function (m) {
      this.col1.SetV(m.col1);
      this.col2.SetV(m.col2);
      this.col3.SetV(m.col3);
    };
    b2Mat33.prototype.AddM = function (m) {
      this.col1.x += m.col1.x;
      this.col1.y += m.col1.y;
      this.col1.z += m.col1.z;
      this.col2.x += m.col2.x;
      this.col2.y += m.col2.y;
      this.col2.z += m.col2.z;
      this.col3.x += m.col3.x;
      this.col3.y += m.col3.y;
      this.col3.z += m.col3.z;
    };
    b2Mat33.prototype.SetIdentity = function () {
      this.col1.x = 1.0;
      this.col2.x = 0.0;
      this.col3.x = 0.0;
      this.col1.y = 0.0;
      this.col2.y = 1.0;
      this.col3.y = 0.0;
      this.col1.z = 0.0;
      this.col2.z = 0.0;
      this.col3.z = 1.0;
    };
    b2Mat33.prototype.SetZero = function () {
      this.col1.x = 0.0;
      this.col2.x = 0.0;
      this.col3.x = 0.0;
      this.col1.y = 0.0;
      this.col2.y = 0.0;
      this.col3.y = 0.0;
      this.col1.z = 0.0;
      this.col2.z = 0.0;
      this.col3.z = 0.0;
    };
    b2Mat33.prototype.Solve22 = function (out, bX, bY) {
      if (bX === undefined) bX = 0;
      if (bY === undefined) bY = 0;
      var a11 = this.col1.x;
      var a12 = this.col2.x;
      var a21 = this.col1.y;
      var a22 = this.col2.y;
      var det = a11 * a22 - a12 * a21;
      if (det != 0.0) {
        det = 1.0 / det;
      }
      out.x = det * (a22 * bX - a12 * bY);
      out.y = det * (a11 * bY - a21 * bX);
      return out;
    };
    b2Mat33.prototype.Solve33 = function (out, bX, bY, bZ) {
      if (bX === undefined) bX = 0;
      if (bY === undefined) bY = 0;
      if (bZ === undefined) bZ = 0;
      var a11 = this.col1.x;
      var a21 = this.col1.y;
      var a31 = this.col1.z;
      var a12 = this.col2.x;
      var a22 = this.col2.y;
      var a32 = this.col2.z;
      var a13 = this.col3.x;
      var a23 = this.col3.y;
      var a33 = this.col3.z;
      var det =
        a11 * (a22 * a33 - a32 * a23) +
        a21 * (a32 * a13 - a12 * a33) +
        a31 * (a12 * a23 - a22 * a13);
      if (det != 0.0) {
        det = 1.0 / det;
      }
      out.x =
        det *
        (bX * (a22 * a33 - a32 * a23) +
          bY * (a32 * a13 - a12 * a33) +
          bZ * (a12 * a23 - a22 * a13));
      out.y =
        det *
        (a11 * (bY * a33 - bZ * a23) +
          a21 * (bZ * a13 - bX * a33) +
          a31 * (bX * a23 - bY * a13));
      out.z =
        det *
        (a11 * (a22 * bZ - a32 * bY) +
          a21 * (a32 * bX - a12 * bZ) +
          a31 * (a12 * bY - a22 * bX));
      return out;
    };
    b2Math.b2Math = function () {};
    b2Math.IsValid = function (x) {
      if (x === undefined) x = 0;
      return isFinite(x);
    };
    b2Math.Dot = function (a, b) {
      return a.x * b.x + a.y * b.y;
    };
    b2Math.CrossVV = function (a, b) {
      return a.x * b.y - a.y * b.x;
    };
    b2Math.CrossVF = function (a, s) {
      if (s === undefined) s = 0;
      var v = new b2Vec2(s * a.y, -s * a.x);
      return v;
    };
    b2Math.CrossFV = function (s, a) {
      if (s === undefined) s = 0;
      var v = new b2Vec2(-s * a.y, s * a.x);
      return v;
    };
    b2Math.MulMV = function (A, v) {
      var u = new b2Vec2(
        A.col1.x * v.x + A.col2.x * v.y,
        A.col1.y * v.x + A.col2.y * v.y
      );
      return u;
    };
    b2Math.MulTMV = function (A, v) {
      var u = new b2Vec2(b2Math.Dot(v, A.col1), b2Math.Dot(v, A.col2));
      return u;
    };
    b2Math.MulX = function (T, v) {
      var a = b2Math.MulMV(T.R, v);
      a.x += T.position.x;
      a.y += T.position.y;
      return a;
    };
    b2Math.MulXT = function (T, v) {
      var a = b2Math.SubtractVV(v, T.position);
      var tX = a.x * T.R.col1.x + a.y * T.R.col1.y;
      a.y = a.x * T.R.col2.x + a.y * T.R.col2.y;
      a.x = tX;
      return a;
    };
    b2Math.AddVV = function (a, b) {
      var v = new b2Vec2(a.x + b.x, a.y + b.y);
      return v;
    };
    b2Math.SubtractVV = function (a, b) {
      var v = new b2Vec2(a.x - b.x, a.y - b.y);
      return v;
    };
    b2Math.Distance = function (a, b) {
      var cX = a.x - b.x;
      var cY = a.y - b.y;
      return Math.sqrt(cX * cX + cY * cY);
    };
    b2Math.DistanceSquared = function (a, b) {
      var cX = a.x - b.x;
      var cY = a.y - b.y;
      return cX * cX + cY * cY;
    };
    b2Math.MulFV = function (s, a) {
      if (s === undefined) s = 0;
      var v = new b2Vec2(s * a.x, s * a.y);
      return v;
    };
    b2Math.AddMM = function (A, B) {
      var C = b2Mat22.FromVV(
        b2Math.AddVV(A.col1, B.col1),
        b2Math.AddVV(A.col2, B.col2)
      );
      return C;
    };
    b2Math.MulMM = function (A, B) {
      var C = b2Mat22.FromVV(b2Math.MulMV(A, B.col1), b2Math.MulMV(A, B.col2));
      return C;
    };
    b2Math.MulTMM = function (A, B) {
      var c1 = new b2Vec2(
        b2Math.Dot(A.col1, B.col1),
        b2Math.Dot(A.col2, B.col1)
      );
      var c2 = new b2Vec2(
        b2Math.Dot(A.col1, B.col2),
        b2Math.Dot(A.col2, B.col2)
      );
      var C = b2Mat22.FromVV(c1, c2);
      return C;
    };
    b2Math.Abs = function (a) {
      if (a === undefined) a = 0;
      return a > 0.0 ? a : -a;
    };
    b2Math.AbsV = function (a) {
      var b = new b2Vec2(b2Math.Abs(a.x), b2Math.Abs(a.y));
      return b;
    };
    b2Math.AbsM = function (A) {
      var B = b2Mat22.FromVV(b2Math.AbsV(A.col1), b2Math.AbsV(A.col2));
      return B;
    };
    b2Math.Min = function (a, b) {
      if (a === undefined) a = 0;
      if (b === undefined) b = 0;
      return a < b ? a : b;
    };
    b2Math.MinV = function (a, b) {
      var c = new b2Vec2(b2Math.Min(a.x, b.x), b2Math.Min(a.y, b.y));
      return c;
    };
    b2Math.Max = function (a, b) {
      if (a === undefined) a = 0;
      if (b === undefined) b = 0;
      return a > b ? a : b;
    };
    b2Math.MaxV = function (a, b) {
      var c = new b2Vec2(b2Math.Max(a.x, b.x), b2Math.Max(a.y, b.y));
      return c;
    };
    b2Math.Clamp = function (a, low, high) {
      if (a === undefined) a = 0;
      if (low === undefined) low = 0;
      if (high === undefined) high = 0;
      return a < low ? low : a > high ? high : a;
    };
    b2Math.ClampV = function (a, low, high) {
      return b2Math.MaxV(low, b2Math.MinV(a, high));
    };
    b2Math.Swap = function (a, b) {
      var tmp = a[0];
      a[0] = b[0];
      b[0] = tmp;
    };
    b2Math.Random = function () {
      return Math.random() * 2 - 1;
    };
    b2Math.RandomRange = function (lo, hi) {
      if (lo === undefined) lo = 0;
      if (hi === undefined) hi = 0;
      var r = Math.random();
      r = (hi - lo) * r + lo;
      return r;
    };
    b2Math.NextPowerOfTwo = function (x) {
      if (x === undefined) x = 0;
      x |= (x >> 1) & 0x7fffffff;
      x |= (x >> 2) & 0x3fffffff;
      x |= (x >> 4) & 0x0fffffff;
      x |= (x >> 8) & 0x00ffffff;
      x |= (x >> 16) & 0x0000ffff;
      return x + 1;
    };
    b2Math.IsPowerOfTwo = function (x) {
      if (x === undefined) x = 0;
      var result = x > 0 && (x & (x - 1)) == 0;
      return result;
    };
    Box2D.postDefs.push(function () {
      Box2D.Common.Math.b2Math.b2Vec2_zero = new b2Vec2(0.0, 0.0);
      Box2D.Common.Math.b2Math.b2Mat22_identity = b2Mat22.FromVV(
        new b2Vec2(1.0, 0.0),
        new b2Vec2(0.0, 1.0)
      );
      Box2D.Common.Math.b2Math.b2Transform_identity = new b2Transform(
        b2Math.b2Vec2_zero,
        b2Math.b2Mat22_identity
      );
    });
    b2Sweep.b2Sweep = function () {
      this.localCenter = new b2Vec2();
      this.c0 = new b2Vec2();
      this.c = new b2Vec2();
    };
    b2Sweep.prototype.Set = function (other) {
      this.localCenter.SetV(other.localCenter);
      this.c0.SetV(other.c0);
      this.c.SetV(other.c);
      this.a0 = other.a0;
      this.a = other.a;
      this.t0 = other.t0;
    };
    b2Sweep.prototype.Copy = function () {
      var copy = new b2Sweep();
      copy.localCenter.SetV(this.localCenter);
      copy.c0.SetV(this.c0);
      copy.c.SetV(this.c);
      copy.a0 = this.a0;
      copy.a = this.a;
      copy.t0 = this.t0;
      return copy;
    };
    b2Sweep.prototype.GetTransform = function (xf, alpha) {
      if (alpha === undefined) alpha = 0;
      xf.position.x = (1.0 - alpha) * this.c0.x + alpha * this.c.x;
      xf.position.y = (1.0 - alpha) * this.c0.y + alpha * this.c.y;
      var angle = (1.0 - alpha) * this.a0 + alpha * this.a;
      xf.R.Set(angle);
      var tMat = xf.R;
      xf.position.x -=
        tMat.col1.x * this.localCenter.x + tMat.col2.x * this.localCenter.y;
      xf.position.y -=
        tMat.col1.y * this.localCenter.x + tMat.col2.y * this.localCenter.y;
    };
    b2Sweep.prototype.Advance = function (t) {
      if (t === undefined) t = 0;
      if (this.t0 < t && 1.0 - this.t0 > Number.MIN_VALUE) {
        var alpha = (t - this.t0) / (1.0 - this.t0);
        this.c0.x = (1.0 - alpha) * this.c0.x + alpha * this.c.x;
        this.c0.y = (1.0 - alpha) * this.c0.y + alpha * this.c.y;
        this.a0 = (1.0 - alpha) * this.a0 + alpha * this.a;
        this.t0 = t;
      }
    };
    b2Transform.b2Transform = function () {
      this.position = new b2Vec2();
      this.R = new b2Mat22();
    };
    b2Transform.prototype.b2Transform = function (pos, r) {
      if (pos === undefined) pos = null;
      if (r === undefined) r = null;
      if (pos) {
        this.position.SetV(pos);
        this.R.SetM(r);
      }
    };
    b2Transform.prototype.Initialize = function (pos, r) {
      this.position.SetV(pos);
      this.R.SetM(r);
    };
    b2Transform.prototype.SetIdentity = function () {
      this.position.SetZero();
      this.R.SetIdentity();
    };
    b2Transform.prototype.Set = function (x) {
      this.position.SetV(x.position);
      this.R.SetM(x.R);
    };
    b2Transform.prototype.GetAngle = function () {
      return Math.atan2(this.R.col1.y, this.R.col1.x);
    };
    b2Vec2.b2Vec2 = function () {};
    b2Vec2.prototype.b2Vec2 = function (x_, y_) {
      if (x_ === undefined) x_ = 0;
      if (y_ === undefined) y_ = 0;
      this.x = x_;
      this.y = y_;
    };
    b2Vec2.prototype.SetZero = function () {
      this.x = 0.0;
      this.y = 0.0;
    };
    b2Vec2.prototype.Set = function (x_, y_) {
      if (x_ === undefined) x_ = 0;
      if (y_ === undefined) y_ = 0;
      this.x = x_;
      this.y = y_;
    };
    b2Vec2.prototype.SetV = function (v) {
      this.x = v.x;
      this.y = v.y;
    };
    b2Vec2.prototype.GetNegative = function () {
      return new b2Vec2(-this.x, -this.y);
    };
    b2Vec2.prototype.NegativeSelf = function () {
      this.x = -this.x;
      this.y = -this.y;
    };
    b2Vec2.Make = function (x_, y_) {
      if (x_ === undefined) x_ = 0;
      if (y_ === undefined) y_ = 0;
      return new b2Vec2(x_, y_);
    };
    b2Vec2.prototype.Copy = function () {
      return new b2Vec2(this.x, this.y);
    };
    b2Vec2.prototype.Add = function (v) {
      this.x += v.x;
      this.y += v.y;
    };
    b2Vec2.prototype.Subtract = function (v) {
      this.x -= v.x;
      this.y -= v.y;
    };
    b2Vec2.prototype.Multiply = function (a) {
      if (a === undefined) a = 0;
      this.x *= a;
      this.y *= a;
    };
    b2Vec2.prototype.MulM = function (A) {
      var tX = this.x;
      this.x = A.col1.x * tX + A.col2.x * this.y;
      this.y = A.col1.y * tX + A.col2.y * this.y;
    };
    b2Vec2.prototype.MulTM = function (A) {
      var tX = b2Math.Dot(this, A.col1);
      this.y = b2Math.Dot(this, A.col2);
      this.x = tX;
    };
    b2Vec2.prototype.CrossVF = function (s) {
      if (s === undefined) s = 0;
      var tX = this.x;
      this.x = s * this.y;
      this.y = -s * tX;
    };
    b2Vec2.prototype.CrossFV = function (s) {
      if (s === undefined) s = 0;
      var tX = this.x;
      this.x = -s * this.y;
      this.y = s * tX;
    };
    b2Vec2.prototype.MinV = function (b) {
      this.x = this.x < b.x ? this.x : b.x;
      this.y = this.y < b.y ? this.y : b.y;
    };
    b2Vec2.prototype.MaxV = function (b) {
      this.x = this.x > b.x ? this.x : b.x;
      this.y = this.y > b.y ? this.y : b.y;
    };
    b2Vec2.prototype.Abs = function () {
      if (this.x < 0) this.x = -this.x;
      if (this.y < 0) this.y = -this.y;
    };
    b2Vec2.prototype.Length = function () {
      return Math.sqrt(this.x * this.x + this.y * this.y);
    };
    b2Vec2.prototype.LengthSquared = function () {
      return this.x * this.x + this.y * this.y;
    };
    b2Vec2.prototype.Normalize = function () {
      var length = Math.sqrt(this.x * this.x + this.y * this.y);
      if (length < Number.MIN_VALUE) {
        return 0.0;
      }
      var invLength = 1.0 / length;
      this.x *= invLength;
      this.y *= invLength;
      return length;
    };
    b2Vec2.prototype.IsValid = function () {
      return b2Math.IsValid(this.x) && b2Math.IsValid(this.y);
    };
    b2Vec3.b2Vec3 = function () {};
    b2Vec3.prototype.b2Vec3 = function (x, y, z) {
      if (x === undefined) x = 0;
      if (y === undefined) y = 0;
      if (z === undefined) z = 0;
      this.x = x;
      this.y = y;
      this.z = z;
    };
    b2Vec3.prototype.SetZero = function () {
      this.x = this.y = this.z = 0.0;
    };
    b2Vec3.prototype.Set = function (x, y, z) {
      if (x === undefined) x = 0;
      if (y === undefined) y = 0;
      if (z === undefined) z = 0;
      this.x = x;
      this.y = y;
      this.z = z;
    };
    b2Vec3.prototype.SetV = function (v) {
      this.x = v.x;
      this.y = v.y;
      this.z = v.z;
    };
    b2Vec3.prototype.GetNegative = function () {
      return new b2Vec3(-this.x, -this.y, -this.z);
    };
    b2Vec3.prototype.NegativeSelf = function () {
      this.x = -this.x;
      this.y = -this.y;
      this.z = -this.z;
    };
    b2Vec3.prototype.Copy = function () {
      return new b2Vec3(this.x, this.y, this.z);
    };
    b2Vec3.prototype.Add = function (v) {
      this.x += v.x;
      this.y += v.y;
      this.z += v.z;
    };
    b2Vec3.prototype.Subtract = function (v) {
      this.x -= v.x;
      this.y -= v.y;
      this.z -= v.z;
    };
    b2Vec3.prototype.Multiply = function (a) {
      if (a === undefined) a = 0;
      this.x *= a;
      this.y *= a;
      this.z *= a;
    };
  })();
  (function () {
    var b2ControllerEdge = Box2D.Dynamics.Controllers.b2ControllerEdge,
      b2Mat22 = Box2D.Common.Math.b2Mat22,
      b2Mat33 = Box2D.Common.Math.b2Mat33,
      b2Math = Box2D.Common.Math.b2Math,
      b2Sweep = Box2D.Common.Math.b2Sweep,
      b2Transform = Box2D.Common.Math.b2Transform,
      b2Vec2 = Box2D.Common.Math.b2Vec2,
      b2Vec3 = Box2D.Common.Math.b2Vec3,
      b2Color = Box2D.Common.b2Color,
      b2internal = Box2D.Common.b2internal,
      b2Settings = Box2D.Common.b2Settings,
      b2AABB = Box2D.Collision.b2AABB,
      b2Bound = Box2D.Collision.b2Bound,
      b2BoundValues = Box2D.Collision.b2BoundValues,
      b2Collision = Box2D.Collision.b2Collision,
      b2ContactID = Box2D.Collision.b2ContactID,
      b2ContactPoint = Box2D.Collision.b2ContactPoint,
      b2Distance = Box2D.Collision.b2Distance,
      b2DistanceInput = Box2D.Collision.b2DistanceInput,
      b2DistanceOutput = Box2D.Collision.b2DistanceOutput,
      b2DistanceProxy = Box2D.Collision.b2DistanceProxy,
      b2DynamicTree = Box2D.Collision.b2DynamicTree,
      b2DynamicTreeBroadPhase = Box2D.Collision.b2DynamicTreeBroadPhase,
      b2DynamicTreeNode = Box2D.Collision.b2DynamicTreeNode,
      b2DynamicTreePair = Box2D.Collision.b2DynamicTreePair,
      b2Manifold = Box2D.Collision.b2Manifold,
      b2ManifoldPoint = Box2D.Collision.b2ManifoldPoint,
      b2Point = Box2D.Collision.b2Point,
      b2RayCastInput = Box2D.Collision.b2RayCastInput,
      b2RayCastOutput = Box2D.Collision.b2RayCastOutput,
      b2Segment = Box2D.Collision.b2Segment,
      b2SeparationFunction = Box2D.Collision.b2SeparationFunction,
      b2Simplex = Box2D.Collision.b2Simplex,
      b2SimplexCache = Box2D.Collision.b2SimplexCache,
      b2SimplexVertex = Box2D.Collision.b2SimplexVertex,
      b2TimeOfImpact = Box2D.Collision.b2TimeOfImpact,
      b2TOIInput = Box2D.Collision.b2TOIInput,
      b2WorldManifold = Box2D.Collision.b2WorldManifold,
      ClipVertex = Box2D.Collision.ClipVertex,
      Features = Box2D.Collision.Features,
      IBroadPhase = Box2D.Collision.IBroadPhase,
      b2CircleShape = Box2D.Collision.Shapes.b2CircleShape,
      b2EdgeChainDef = Box2D.Collision.Shapes.b2EdgeChainDef,
      b2EdgeShape = Box2D.Collision.Shapes.b2EdgeShape,
      b2MassData = Box2D.Collision.Shapes.b2MassData,
      b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape,
      b2Shape = Box2D.Collision.Shapes.b2Shape,
      b2Body = Box2D.Dynamics.b2Body,
      b2BodyDef = Box2D.Dynamics.b2BodyDef,
      b2ContactFilter = Box2D.Dynamics.b2ContactFilter,
      b2ContactImpulse = Box2D.Dynamics.b2ContactImpulse,
      b2ContactListener = Box2D.Dynamics.b2ContactListener,
      b2ContactManager = Box2D.Dynamics.b2ContactManager,
      b2DebugDraw = Box2D.Dynamics.b2DebugDraw,
      b2DestructionListener = Box2D.Dynamics.b2DestructionListener,
      b2FilterData = Box2D.Dynamics.b2FilterData,
      b2Fixture = Box2D.Dynamics.b2Fixture,
      b2FixtureDef = Box2D.Dynamics.b2FixtureDef,
      b2Island = Box2D.Dynamics.b2Island,
      b2TimeStep = Box2D.Dynamics.b2TimeStep,
      b2World = Box2D.Dynamics.b2World,
      b2CircleContact = Box2D.Dynamics.Contacts.b2CircleContact,
      b2Contact = Box2D.Dynamics.Contacts.b2Contact,
      b2ContactConstraint = Box2D.Dynamics.Contacts.b2ContactConstraint,
      b2ContactConstraintPoint =
        Box2D.Dynamics.Contacts.b2ContactConstraintPoint,
      b2ContactEdge = Box2D.Dynamics.Contacts.b2ContactEdge,
      b2ContactFactory = Box2D.Dynamics.Contacts.b2ContactFactory,
      b2ContactRegister = Box2D.Dynamics.Contacts.b2ContactRegister,
      b2ContactResult = Box2D.Dynamics.Contacts.b2ContactResult,
      b2ContactSolver = Box2D.Dynamics.Contacts.b2ContactSolver,
      b2EdgeAndCircleContact = Box2D.Dynamics.Contacts.b2EdgeAndCircleContact,
      b2NullContact = Box2D.Dynamics.Contacts.b2NullContact,
      b2PolyAndCircleContact = Box2D.Dynamics.Contacts.b2PolyAndCircleContact,
      b2PolyAndEdgeContact = Box2D.Dynamics.Contacts.b2PolyAndEdgeContact,
      b2PolygonContact = Box2D.Dynamics.Contacts.b2PolygonContact,
      b2PositionSolverManifold =
        Box2D.Dynamics.Contacts.b2PositionSolverManifold,
      b2Controller = Box2D.Dynamics.Controllers.b2Controller,
      b2DistanceJoint = Box2D.Dynamics.Joints.b2DistanceJoint,
      b2DistanceJointDef = Box2D.Dynamics.Joints.b2DistanceJointDef,
      b2FrictionJoint = Box2D.Dynamics.Joints.b2FrictionJoint,
      b2FrictionJointDef = Box2D.Dynamics.Joints.b2FrictionJointDef,
      b2GearJoint = Box2D.Dynamics.Joints.b2GearJoint,
      b2GearJointDef = Box2D.Dynamics.Joints.b2GearJointDef,
      b2Jacobian = Box2D.Dynamics.Joints.b2Jacobian,
      b2Joint = Box2D.Dynamics.Joints.b2Joint,
      b2JointDef = Box2D.Dynamics.Joints.b2JointDef,
      b2JointEdge = Box2D.Dynamics.Joints.b2JointEdge,
      b2LineJoint = Box2D.Dynamics.Joints.b2LineJoint,
      b2LineJointDef = Box2D.Dynamics.Joints.b2LineJointDef,
      b2MouseJoint = Box2D.Dynamics.Joints.b2MouseJoint,
      b2MouseJointDef = Box2D.Dynamics.Joints.b2MouseJointDef,
      b2PrismaticJoint = Box2D.Dynamics.Joints.b2PrismaticJoint,
      b2PrismaticJointDef = Box2D.Dynamics.Joints.b2PrismaticJointDef,
      b2PulleyJoint = Box2D.Dynamics.Joints.b2PulleyJoint,
      b2PulleyJointDef = Box2D.Dynamics.Joints.b2PulleyJointDef,
      b2RevoluteJoint = Box2D.Dynamics.Joints.b2RevoluteJoint,
      b2RevoluteJointDef = Box2D.Dynamics.Joints.b2RevoluteJointDef,
      b2WeldJoint = Box2D.Dynamics.Joints.b2WeldJoint,
      b2WeldJointDef = Box2D.Dynamics.Joints.b2WeldJointDef;

    b2Body.b2Body = function () {
      this.m_xf = new b2Transform();
      this.m_sweep = new b2Sweep();
      this.m_linearVelocity = new b2Vec2();
      this.m_force = new b2Vec2();
    };
    b2Body.prototype.connectEdges = function (s1, s2, angle1) {
      if (angle1 === undefined) angle1 = 0;
      var angle2 = Math.atan2(
        s2.GetDirectionVector().y,
        s2.GetDirectionVector().x
      );
      var coreOffset = Math.tan((angle2 - angle1) * 0.5);
      var core = b2Math.MulFV(coreOffset, s2.GetDirectionVector());
      core = b2Math.SubtractVV(core, s2.GetNormalVector());
      core = b2Math.MulFV(b2Settings.b2_toiSlop, core);
      core = b2Math.AddVV(core, s2.GetVertex1());
      var cornerDir = b2Math.AddVV(
        s1.GetDirectionVector(),
        s2.GetDirectionVector()
      );
      cornerDir.Normalize();
      var convex =
        b2Math.Dot(s1.GetDirectionVector(), s2.GetNormalVector()) > 0.0;
      s1.SetNextEdge(s2, core, cornerDir, convex);
      s2.SetPrevEdge(s1, core, cornerDir, convex);
      return angle2;
    };
    b2Body.prototype.CreateFixture = function (def) {
      if (this.m_world.IsLocked() == true) {
        return null;
      }
      var fixture = new b2Fixture();
      fixture.Create(this, this.m_xf, def);
      if (this.m_flags & b2Body.e_activeFlag) {
        var broadPhase = this.m_world.m_contactManager.m_broadPhase;
        fixture.CreateProxy(broadPhase, this.m_xf);
      }
      fixture.m_next = this.m_fixtureList;
      this.m_fixtureList = fixture;
      ++this.m_fixtureCount;
      fixture.m_body = this;
      if (fixture.m_density > 0.0) {
        this.ResetMassData();
      }
      this.m_world.m_flags |= b2World.e_newFixture;
      return fixture;
    };
    b2Body.prototype.CreateFixture2 = function (shape, density) {
      if (density === undefined) density = 0.0;
      var def = new b2FixtureDef();
      def.shape = shape;
      def.density = density;
      return this.CreateFixture(def);
    };
    b2Body.prototype.DestroyFixture = function (fixture) {
      if (this.m_world.IsLocked() == true) {
        return;
      }
      var node = this.m_fixtureList;
      var ppF = null;
      var found = false;
      while (node != null) {
        if (node == fixture) {
          if (ppF) ppF.m_next = fixture.m_next;
          else this.m_fixtureList = fixture.m_next;
          found = true;
          break;
        }
        ppF = node;
        node = node.m_next;
      }
      var edge = this.m_contactList;
      while (edge) {
        var c = edge.contact;
        edge = edge.next;
        var fixtureA = c.GetFixtureA();
        var fixtureB = c.GetFixtureB();
        if (fixture == fixtureA || fixture == fixtureB) {
          this.m_world.m_contactManager.Destroy(c);
        }
      }
      if (this.m_flags & b2Body.e_activeFlag) {
        var broadPhase = this.m_world.m_contactManager.m_broadPhase;
        fixture.DestroyProxy(broadPhase);
      } else {
      }
      fixture.Destroy();
      fixture.m_body = null;
      fixture.m_next = null;
      --this.m_fixtureCount;
      this.ResetMassData();
    };
    b2Body.prototype.SetPositionAndAngle = function (position, angle) {
      if (angle === undefined) angle = 0;
      var f;
      if (this.m_world.IsLocked() == true) {
        return;
      }
      this.m_xf.R.Set(angle);
      this.m_xf.position.SetV(position);
      var tMat = this.m_xf.R;
      var tVec = this.m_sweep.localCenter;
      this.m_sweep.c.x = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
      this.m_sweep.c.y = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
      this.m_sweep.c.x += this.m_xf.position.x;
      this.m_sweep.c.y += this.m_xf.position.y;
      this.m_sweep.c0.SetV(this.m_sweep.c);
      this.m_sweep.a0 = this.m_sweep.a = angle;
      var broadPhase = this.m_world.m_contactManager.m_broadPhase;
      for (f = this.m_fixtureList; f; f = f.m_next) {
        f.Synchronize(broadPhase, this.m_xf, this.m_xf);
      }
      this.m_world.m_contactManager.FindNewContacts();
    };
    b2Body.prototype.SetTransform = function (xf) {
      this.SetPositionAndAngle(xf.position, xf.GetAngle());
    };
    b2Body.prototype.GetTransform = function () {
      return this.m_xf;
    };
    b2Body.prototype.GetPosition = function () {
      return this.m_xf.position;
    };
    b2Body.prototype.SetPosition = function (position) {
      this.SetPositionAndAngle(position, this.GetAngle());
    };
    b2Body.prototype.GetAngle = function () {
      return this.m_sweep.a;
    };
    b2Body.prototype.SetAngle = function (angle) {
      if (angle === undefined) angle = 0;
      this.SetPositionAndAngle(this.GetPosition(), angle);
    };
    b2Body.prototype.GetWorldCenter = function () {
      return this.m_sweep.c;
    };
    b2Body.prototype.GetLocalCenter = function () {
      return this.m_sweep.localCenter;
    };
    b2Body.prototype.SetLinearVelocity = function (v) {
      if (this.m_type == b2Body.b2_staticBody) {
        return;
      }
      this.m_linearVelocity.SetV(v);
    };
    b2Body.prototype.GetLinearVelocity = function () {
      return this.m_linearVelocity;
    };
    b2Body.prototype.SetAngularVelocity = function (omega) {
      if (omega === undefined) omega = 0;
      if (this.m_type == b2Body.b2_staticBody) {
        return;
      }
      this.m_angularVelocity = omega;
    };
    b2Body.prototype.GetAngularVelocity = function () {
      return this.m_angularVelocity;
    };
    b2Body.prototype.GetDefinition = function () {
      var bd = new b2BodyDef();
      bd.type = this.GetType();
      bd.allowSleep =
        (this.m_flags & b2Body.e_allowSleepFlag) == b2Body.e_allowSleepFlag;
      bd.angle = this.GetAngle();
      bd.angularDamping = this.m_angularDamping;
      bd.angularVelocity = this.m_angularVelocity;
      bd.fixedRotation =
        (this.m_flags & b2Body.e_fixedRotationFlag) ==
        b2Body.e_fixedRotationFlag;
      bd.bullet = (this.m_flags & b2Body.e_bulletFlag) == b2Body.e_bulletFlag;
      bd.awake = (this.m_flags & b2Body.e_awakeFlag) == b2Body.e_awakeFlag;
      bd.linearDamping = this.m_linearDamping;
      bd.linearVelocity.SetV(this.GetLinearVelocity());
      bd.position = this.GetPosition();
      bd.userData = this.GetUserData();
      return bd;
    };
    b2Body.prototype.ApplyForce = function (force, point) {
      if (this.m_type != b2Body.b2_dynamicBody) {
        return;
      }
      if (this.IsAwake() == false) {
        this.SetAwake(true);
      }
      this.m_force.x += force.x;
      this.m_force.y += force.y;
      this.m_torque +=
        (point.x - this.m_sweep.c.x) * force.y -
        (point.y - this.m_sweep.c.y) * force.x;
    };
    b2Body.prototype.ApplyTorque = function (torque) {
      if (torque === undefined) torque = 0;
      if (this.m_type != b2Body.b2_dynamicBody) {
        return;
      }
      if (this.IsAwake() == false) {
        this.SetAwake(true);
      }
      this.m_torque += torque;
    };
    b2Body.prototype.ApplyImpulse = function (impulse, point) {
      if (this.m_type != b2Body.b2_dynamicBody) {
        return;
      }
      if (this.IsAwake() == false) {
        this.SetAwake(true);
      }
      this.m_linearVelocity.x += this.m_invMass * impulse.x;
      this.m_linearVelocity.y += this.m_invMass * impulse.y;
      this.m_angularVelocity +=
        this.m_invI *
        ((point.x - this.m_sweep.c.x) * impulse.y -
          (point.y - this.m_sweep.c.y) * impulse.x);
    };
    b2Body.prototype.Split = function (callback) {
      var linearVelocity = this.GetLinearVelocity().Copy();
      var angularVelocity = this.GetAngularVelocity();
      var center = this.GetWorldCenter();
      var body1 = this;
      var body2 = this.m_world.CreateBody(this.GetDefinition());
      var prev;
      for (var f = body1.m_fixtureList; f; ) {
        if (callback(f)) {
          var next = f.m_next;
          if (prev) {
            prev.m_next = next;
          } else {
            body1.m_fixtureList = next;
          }
          body1.m_fixtureCount--;
          f.m_next = body2.m_fixtureList;
          body2.m_fixtureList = f;
          body2.m_fixtureCount++;
          f.m_body = body2;
          f = next;
        } else {
          prev = f;
          f = f.m_next;
        }
      }
      body1.ResetMassData();
      body2.ResetMassData();
      var center1 = body1.GetWorldCenter();
      var center2 = body2.GetWorldCenter();
      var velocity1 = b2Math.AddVV(
        linearVelocity,
        b2Math.CrossFV(angularVelocity, b2Math.SubtractVV(center1, center))
      );
      var velocity2 = b2Math.AddVV(
        linearVelocity,
        b2Math.CrossFV(angularVelocity, b2Math.SubtractVV(center2, center))
      );
      body1.SetLinearVelocity(velocity1);
      body2.SetLinearVelocity(velocity2);
      body1.SetAngularVelocity(angularVelocity);
      body2.SetAngularVelocity(angularVelocity);
      body1.SynchronizeFixtures();
      body2.SynchronizeFixtures();
      return body2;
    };
    b2Body.prototype.Merge = function (other) {
      var f;
      for (f = other.m_fixtureList; f; ) {
        var next = f.m_next;
        other.m_fixtureCount--;
        f.m_next = this.m_fixtureList;
        this.m_fixtureList = f;
        this.m_fixtureCount++;
        f.m_body = body2;
        f = next;
      }
      body1.m_fixtureCount = 0;
      var body1 = this;
      var body2 = other;
      var center1 = body1.GetWorldCenter();
      var center2 = body2.GetWorldCenter();
      var velocity1 = body1.GetLinearVelocity().Copy();
      var velocity2 = body2.GetLinearVelocity().Copy();
      var angular1 = body1.GetAngularVelocity();
      var angular = body2.GetAngularVelocity();
      body1.ResetMassData();
      this.SynchronizeFixtures();
    };
    b2Body.prototype.GetMass = function () {
      return this.m_mass;
    };
    b2Body.prototype.GetInertia = function () {
      return this.m_I;
    };
    b2Body.prototype.GetMassData = function (data) {
      data.mass = this.m_mass;
      data.I = this.m_I;
      data.center.SetV(this.m_sweep.localCenter);
    };
    b2Body.prototype.SetMassData = function (massData) {
      b2Settings.b2Assert(this.m_world.IsLocked() == false);
      if (this.m_world.IsLocked() == true) {
        return;
      }
      if (this.m_type != b2Body.b2_dynamicBody) {
        return;
      }
      this.m_invMass = 0.0;
      this.m_I = 0.0;
      this.m_invI = 0.0;
      this.m_mass = massData.mass;
      if (this.m_mass <= 0.0) {
        this.m_mass = 1.0;
      }
      this.m_invMass = 1.0 / this.m_mass;
      if (
        massData.I > 0.0 &&
        (this.m_flags & b2Body.e_fixedRotationFlag) == 0
      ) {
        this.m_I =
          massData.I -
          this.m_mass *
            (massData.center.x * massData.center.x +
              massData.center.y * massData.center.y);
        this.m_invI = 1.0 / this.m_I;
      }
      var oldCenter = this.m_sweep.c.Copy();
      this.m_sweep.localCenter.SetV(massData.center);
      this.m_sweep.c0.SetV(b2Math.MulX(this.m_xf, this.m_sweep.localCenter));
      this.m_sweep.c.SetV(this.m_sweep.c0);
      this.m_linearVelocity.x +=
        this.m_angularVelocity * -(this.m_sweep.c.y - oldCenter.y);
      this.m_linearVelocity.y +=
        this.m_angularVelocity * +(this.m_sweep.c.x - oldCenter.x);
    };
    b2Body.prototype.ResetMassData = function () {
      this.m_mass = 0.0;
      this.m_invMass = 0.0;
      this.m_I = 0.0;
      this.m_invI = 0.0;
      this.m_sweep.localCenter.SetZero();
      if (
        this.m_type == b2Body.b2_staticBody ||
        this.m_type == b2Body.b2_kinematicBody
      ) {
        return;
      }
      var center = b2Vec2.Make(0, 0);
      for (var f = this.m_fixtureList; f; f = f.m_next) {
        if (f.m_density == 0.0) {
          continue;
        }
        var massData = f.GetMassData();
        this.m_mass += massData.mass;
        center.x += massData.center.x * massData.mass;
        center.y += massData.center.y * massData.mass;
        this.m_I += massData.I;
      }
      if (this.m_mass > 0.0) {
        this.m_invMass = 1.0 / this.m_mass;
        center.x *= this.m_invMass;
        center.y *= this.m_invMass;
      } else {
        this.m_mass = 1.0;
        this.m_invMass = 1.0;
      }
      if (this.m_I > 0.0 && (this.m_flags & b2Body.e_fixedRotationFlag) == 0) {
        this.m_I -= this.m_mass * (center.x * center.x + center.y * center.y);
        this.m_I *= this.m_inertiaScale;
        b2Settings.b2Assert(this.m_I > 0);
        this.m_invI = 1.0 / this.m_I;
      } else {
        this.m_I = 0.0;
        this.m_invI = 0.0;
      }
      var oldCenter = this.m_sweep.c.Copy();
      this.m_sweep.localCenter.SetV(center);
      this.m_sweep.c0.SetV(b2Math.MulX(this.m_xf, this.m_sweep.localCenter));
      this.m_sweep.c.SetV(this.m_sweep.c0);
      this.m_linearVelocity.x +=
        this.m_angularVelocity * -(this.m_sweep.c.y - oldCenter.y);
      this.m_linearVelocity.y +=
        this.m_angularVelocity * +(this.m_sweep.c.x - oldCenter.x);
    };
    b2Body.prototype.GetWorldPoint = function (localPoint) {
      var A = this.m_xf.R;
      var u = new b2Vec2(
        A.col1.x * localPoint.x + A.col2.x * localPoint.y,
        A.col1.y * localPoint.x + A.col2.y * localPoint.y
      );
      u.x += this.m_xf.position.x;
      u.y += this.m_xf.position.y;
      return u;
    };
    b2Body.prototype.GetWorldVector = function (localVector) {
      return b2Math.MulMV(this.m_xf.R, localVector);
    };
    b2Body.prototype.GetLocalPoint = function (worldPoint) {
      return b2Math.MulXT(this.m_xf, worldPoint);
    };
    b2Body.prototype.GetLocalVector = function (worldVector) {
      return b2Math.MulTMV(this.m_xf.R, worldVector);
    };
    b2Body.prototype.GetLinearVelocityFromWorldPoint = function (worldPoint) {
      return new b2Vec2(
        this.m_linearVelocity.x -
          this.m_angularVelocity * (worldPoint.y - this.m_sweep.c.y),
        this.m_linearVelocity.y +
          this.m_angularVelocity * (worldPoint.x - this.m_sweep.c.x)
      );
    };
    b2Body.prototype.GetLinearVelocityFromLocalPoint = function (localPoint) {
      var A = this.m_xf.R;
      var worldPoint = new b2Vec2(
        A.col1.x * localPoint.x + A.col2.x * localPoint.y,
        A.col1.y * localPoint.x + A.col2.y * localPoint.y
      );
      worldPoint.x += this.m_xf.position.x;
      worldPoint.y += this.m_xf.position.y;
      return new b2Vec2(
        this.m_linearVelocity.x -
          this.m_angularVelocity * (worldPoint.y - this.m_sweep.c.y),
        this.m_linearVelocity.y +
          this.m_angularVelocity * (worldPoint.x - this.m_sweep.c.x)
      );
    };
    b2Body.prototype.GetLinearDamping = function () {
      return this.m_linearDamping;
    };
    b2Body.prototype.SetLinearDamping = function (linearDamping) {
      if (linearDamping === undefined) linearDamping = 0;
      this.m_linearDamping = linearDamping;
    };
    b2Body.prototype.GetAngularDamping = function () {
      return this.m_angularDamping;
    };
    b2Body.prototype.SetAngularDamping = function (angularDamping) {
      if (angularDamping === undefined) angularDamping = 0;
      this.m_angularDamping = angularDamping;
    };
    b2Body.prototype.SetType = function (type) {
      if (type === undefined) type = 0;
      if (this.m_type == type) {
        return;
      }
      this.m_type = type;
      this.ResetMassData();
      if (this.m_type == b2Body.b2_staticBody) {
        this.m_linearVelocity.SetZero();
        this.m_angularVelocity = 0.0;
      }
      this.SetAwake(true);
      this.m_force.SetZero();
      this.m_torque = 0.0;
      for (var ce = this.m_contactList; ce; ce = ce.next) {
        ce.contact.FlagForFiltering();
      }
    };
    b2Body.prototype.GetType = function () {
      return this.m_type;
    };
    b2Body.prototype.SetBullet = function (flag) {
      if (flag) {
        this.m_flags |= b2Body.e_bulletFlag;
      } else {
        this.m_flags &= ~b2Body.e_bulletFlag;
      }
    };
    b2Body.prototype.IsBullet = function () {
      return (this.m_flags & b2Body.e_bulletFlag) == b2Body.e_bulletFlag;
    };
    b2Body.prototype.SetSleepingAllowed = function (flag) {
      if (flag) {
        this.m_flags |= b2Body.e_allowSleepFlag;
      } else {
        this.m_flags &= ~b2Body.e_allowSleepFlag;
        this.SetAwake(true);
      }
    };
    b2Body.prototype.SetAwake = function (flag) {
      if (flag) {
        this.m_flags |= b2Body.e_awakeFlag;
        this.m_sleepTime = 0.0;
      } else {
        this.m_flags &= ~b2Body.e_awakeFlag;
        this.m_sleepTime = 0.0;
        this.m_linearVelocity.SetZero();
        this.m_angularVelocity = 0.0;
        this.m_force.SetZero();
        this.m_torque = 0.0;
      }
    };
    b2Body.prototype.IsAwake = function () {
      return (this.m_flags & b2Body.e_awakeFlag) == b2Body.e_awakeFlag;
    };
    b2Body.prototype.SetFixedRotation = function (fixed) {
      if (fixed) {
        this.m_flags |= b2Body.e_fixedRotationFlag;
      } else {
        this.m_flags &= ~b2Body.e_fixedRotationFlag;
      }
      this.ResetMassData();
    };
    b2Body.prototype.IsFixedRotation = function () {
      return (
        (this.m_flags & b2Body.e_fixedRotationFlag) ==
        b2Body.e_fixedRotationFlag
      );
    };
    b2Body.prototype.SetActive = function (flag) {
      if (flag == this.IsActive()) {
        return;
      }
      var broadPhase;
      var f;
      if (flag) {
        this.m_flags |= b2Body.e_activeFlag;
        broadPhase = this.m_world.m_contactManager.m_broadPhase;
        for (f = this.m_fixtureList; f; f = f.m_next) {
          f.CreateProxy(broadPhase, this.m_xf);
        }
      } else {
        this.m_flags &= ~b2Body.e_activeFlag;
        broadPhase = this.m_world.m_contactManager.m_broadPhase;
        for (f = this.m_fixtureList; f; f = f.m_next) {
          f.DestroyProxy(broadPhase);
        }
        var ce = this.m_contactList;
        while (ce) {
          var ce0 = ce;
          ce = ce.next;
          this.m_world.m_contactManager.Destroy(ce0.contact);
        }
        this.m_contactList = null;
      }
    };
    b2Body.prototype.IsActive = function () {
      return (this.m_flags & b2Body.e_activeFlag) == b2Body.e_activeFlag;
    };
    b2Body.prototype.IsSleepingAllowed = function () {
      return (
        (this.m_flags & b2Body.e_allowSleepFlag) == b2Body.e_allowSleepFlag
      );
    };
    b2Body.prototype.GetFixtureList = function () {
      return this.m_fixtureList;
    };
    b2Body.prototype.GetJointList = function () {
      return this.m_jointList;
    };
    b2Body.prototype.GetControllerList = function () {
      return this.m_controllerList;
    };
    b2Body.prototype.GetContactList = function () {
      return this.m_contactList;
    };
    b2Body.prototype.GetNext = function () {
      return this.m_next;
    };
    b2Body.prototype.GetUserData = function () {
      return this.m_userData;
    };
    b2Body.prototype.SetUserData = function (data) {
      this.m_userData = data;
    };
    b2Body.prototype.GetWorld = function () {
      return this.m_world;
    };
    b2Body.prototype.b2Body = function (bd, world) {
      this.m_flags = 0;
      if (bd.bullet) {
        this.m_flags |= b2Body.e_bulletFlag;
      }
      if (bd.fixedRotation) {
        this.m_flags |= b2Body.e_fixedRotationFlag;
      }
      if (bd.allowSleep) {
        this.m_flags |= b2Body.e_allowSleepFlag;
      }
      if (bd.awake) {
        this.m_flags |= b2Body.e_awakeFlag;
      }
      if (bd.active) {
        this.m_flags |= b2Body.e_activeFlag;
      }
      this.m_world = world;
      this.m_xf.position.SetV(bd.position);
      this.m_xf.R.Set(bd.angle);
      this.m_sweep.localCenter.SetZero();
      this.m_sweep.t0 = 1.0;
      this.m_sweep.a0 = this.m_sweep.a = bd.angle;
      var tMat = this.m_xf.R;
      var tVec = this.m_sweep.localCenter;
      this.m_sweep.c.x = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
      this.m_sweep.c.y = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
      this.m_sweep.c.x += this.m_xf.position.x;
      this.m_sweep.c.y += this.m_xf.position.y;
      this.m_sweep.c0.SetV(this.m_sweep.c);
      this.m_jointList = null;
      this.m_controllerList = null;
      this.m_contactList = null;
      this.m_controllerCount = 0;
      this.m_prev = null;
      this.m_next = null;
      this.m_linearVelocity.SetV(bd.linearVelocity);
      this.m_angularVelocity = bd.angularVelocity;
      this.m_linearDamping = bd.linearDamping;
      this.m_angularDamping = bd.angularDamping;
      this.m_force.Set(0.0, 0.0);
      this.m_torque = 0.0;
      this.m_sleepTime = 0.0;
      this.m_type = bd.type;
      if (this.m_type == b2Body.b2_dynamicBody) {
        this.m_mass = 1.0;
        this.m_invMass = 1.0;
      } else {
        this.m_mass = 0.0;
        this.m_invMass = 0.0;
      }
      this.m_I = 0.0;
      this.m_invI = 0.0;
      this.m_inertiaScale = bd.inertiaScale;
      this.m_userData = bd.userData;
      this.m_fixtureList = null;
      this.m_fixtureCount = 0;
    };
    b2Body.prototype.SynchronizeFixtures = function () {
      var xf1 = b2Body.s_xf1;
      xf1.R.Set(this.m_sweep.a0);
      var tMat = xf1.R;
      var tVec = this.m_sweep.localCenter;
      xf1.position.x =
        this.m_sweep.c0.x - (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      xf1.position.y =
        this.m_sweep.c0.y - (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
      var f;
      var broadPhase = this.m_world.m_contactManager.m_broadPhase;
      for (f = this.m_fixtureList; f; f = f.m_next) {
        f.Synchronize(broadPhase, xf1, this.m_xf);
      }
    };
    b2Body.prototype.SynchronizeTransform = function () {
      this.m_xf.R.Set(this.m_sweep.a);
      var tMat = this.m_xf.R;
      var tVec = this.m_sweep.localCenter;
      this.m_xf.position.x =
        this.m_sweep.c.x - (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
      this.m_xf.position.y =
        this.m_sweep.c.y - (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
    };
    b2Body.prototype.ShouldCollide = function (other) {
      if (
        this.m_type != b2Body.b2_dynamicBody &&
        other.m_type != b2Body.b2_dynamicBody
      ) {
        return false;
      }
      for (var jn = this.m_jointList; jn; jn = jn.next) {
        if (jn.other == other)
          if (jn.joint.m_collideConnected == false) {
            return false;
          }
      }
      return true;
    };
    b2Body.prototype.Advance = function (t) {
      if (t === undefined) t = 0;
      this.m_sweep.Advance(t);
      this.m_sweep.c.SetV(this.m_sweep.c0);
      this.m_sweep.a = this.m_sweep.a0;
      this.SynchronizeTransform();
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.b2Body.s_xf1 = new b2Transform();
      Box2D.Dynamics.b2Body.e_islandFlag = 0x0001;
      Box2D.Dynamics.b2Body.e_awakeFlag = 0x0002;
      Box2D.Dynamics.b2Body.e_allowSleepFlag = 0x0004;
      Box2D.Dynamics.b2Body.e_bulletFlag = 0x0008;
      Box2D.Dynamics.b2Body.e_fixedRotationFlag = 0x0010;
      Box2D.Dynamics.b2Body.e_activeFlag = 0x0020;
      Box2D.Dynamics.b2Body.b2_staticBody = 0;
      Box2D.Dynamics.b2Body.b2_kinematicBody = 1;
      Box2D.Dynamics.b2Body.b2_dynamicBody = 2;
    });
    b2BodyDef.b2BodyDef = function () {
      this.position = new b2Vec2();
      this.linearVelocity = new b2Vec2();
    };
    b2BodyDef.prototype.b2BodyDef = function () {
      this.userData = null;
      this.position.Set(0.0, 0.0);
      this.angle = 0.0;
      this.linearVelocity.Set(0, 0);
      this.angularVelocity = 0.0;
      this.linearDamping = 0.0;
      this.angularDamping = 0.0;
      this.allowSleep = true;
      this.awake = true;
      this.fixedRotation = false;
      this.bullet = false;
      this.type = b2Body.b2_staticBody;
      this.active = true;
      this.inertiaScale = 1.0;
    };
    b2ContactFilter.b2ContactFilter = function () {};
    b2ContactFilter.prototype.ShouldCollide = function (fixtureA, fixtureB) {
      var filter1 = fixtureA.GetFilterData();
      var filter2 = fixtureB.GetFilterData();
      if (filter1.groupIndex == filter2.groupIndex && filter1.groupIndex != 0) {
        return filter1.groupIndex > 0;
      }
      var collide =
        (filter1.maskBits & filter2.categoryBits) != 0 &&
        (filter1.categoryBits & filter2.maskBits) != 0;
      return collide;
    };
    b2ContactFilter.prototype.RayCollide = function (userData, fixture) {
      if (!userData) return true;
      return this.ShouldCollide(
        userData instanceof b2Fixture ? userData : null,
        fixture
      );
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.b2ContactFilter.b2_defaultFilter = new b2ContactFilter();
    });
    b2ContactImpulse.b2ContactImpulse = function () {
      this.normalImpulses = new Vector_a2j_Number(
        b2Settings.b2_maxManifoldPoints
      );
      this.tangentImpulses = new Vector_a2j_Number(
        b2Settings.b2_maxManifoldPoints
      );
    };
    b2ContactListener.b2ContactListener = function () {};
    b2ContactListener.prototype.BeginContact = function (contact) {};
    b2ContactListener.prototype.EndContact = function (contact) {};
    b2ContactListener.prototype.PreSolve = function (contact, oldManifold) {};
    b2ContactListener.prototype.PostSolve = function (contact, impulse) {};
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.b2ContactListener.b2_defaultListener =
        new b2ContactListener();
    });
    b2ContactManager.b2ContactManager = function () {};
    b2ContactManager.prototype.b2ContactManager = function () {
      this.m_world = null;
      this.m_contactCount = 0;
      this.m_contactFilter = b2ContactFilter.b2_defaultFilter;
      this.m_contactListener = b2ContactListener.b2_defaultListener;
      this.m_contactFactory = new b2ContactFactory(this.m_allocator);
      this.m_broadPhase = new b2DynamicTreeBroadPhase();
    };
    b2ContactManager.prototype.AddPair = function (
      proxyUserDataA,
      proxyUserDataB
    ) {
      var fixtureA =
        proxyUserDataA instanceof b2Fixture ? proxyUserDataA : null;
      var fixtureB =
        proxyUserDataB instanceof b2Fixture ? proxyUserDataB : null;
      var bodyA = fixtureA.GetBody();
      var bodyB = fixtureB.GetBody();
      if (bodyA == bodyB) return;
      var edge = bodyB.GetContactList();
      while (edge) {
        if (edge.other == bodyA) {
          var fA = edge.contact.GetFixtureA();
          var fB = edge.contact.GetFixtureB();
          if (fA == fixtureA && fB == fixtureB) return;
          if (fA == fixtureB && fB == fixtureA) return;
        }
        edge = edge.next;
      }
      if (bodyB.ShouldCollide(bodyA) == false) {
        return;
      }
      if (this.m_contactFilter.ShouldCollide(fixtureA, fixtureB) == false) {
        return;
      }
      var c = this.m_contactFactory.Create(fixtureA, fixtureB);
      fixtureA = c.GetFixtureA();
      fixtureB = c.GetFixtureB();
      bodyA = fixtureA.m_body;
      bodyB = fixtureB.m_body;
      c.m_prev = null;
      c.m_next = this.m_world.m_contactList;
      if (this.m_world.m_contactList != null) {
        this.m_world.m_contactList.m_prev = c;
      }
      this.m_world.m_contactList = c;
      c.m_nodeA.contact = c;
      c.m_nodeA.other = bodyB;
      c.m_nodeA.prev = null;
      c.m_nodeA.next = bodyA.m_contactList;
      if (bodyA.m_contactList != null) {
        bodyA.m_contactList.prev = c.m_nodeA;
      }
      bodyA.m_contactList = c.m_nodeA;
      c.m_nodeB.contact = c;
      c.m_nodeB.other = bodyA;
      c.m_nodeB.prev = null;
      c.m_nodeB.next = bodyB.m_contactList;
      if (bodyB.m_contactList != null) {
        bodyB.m_contactList.prev = c.m_nodeB;
      }
      bodyB.m_contactList = c.m_nodeB;
      ++this.m_world.m_contactCount;
      return;
    };
    b2ContactManager.prototype.FindNewContacts = function () {
      this.m_broadPhase.UpdatePairs(Box2D.generateCallback(this, this.AddPair));
    };
    b2ContactManager.prototype.Destroy = function (c) {
      var fixtureA = c.GetFixtureA();
      var fixtureB = c.GetFixtureB();
      var bodyA = fixtureA.GetBody();
      var bodyB = fixtureB.GetBody();
      if (c.IsTouching()) {
        this.m_contactListener.EndContact(c);
      }
      if (c.m_prev) {
        c.m_prev.m_next = c.m_next;
      }
      if (c.m_next) {
        c.m_next.m_prev = c.m_prev;
      }
      if (c == this.m_world.m_contactList) {
        this.m_world.m_contactList = c.m_next;
      }
      if (c.m_nodeA.prev) {
        c.m_nodeA.prev.next = c.m_nodeA.next;
      }
      if (c.m_nodeA.next) {
        c.m_nodeA.next.prev = c.m_nodeA.prev;
      }
      if (c.m_nodeA == bodyA.m_contactList) {
        bodyA.m_contactList = c.m_nodeA.next;
      }
      if (c.m_nodeB.prev) {
        c.m_nodeB.prev.next = c.m_nodeB.next;
      }
      if (c.m_nodeB.next) {
        c.m_nodeB.next.prev = c.m_nodeB.prev;
      }
      if (c.m_nodeB == bodyB.m_contactList) {
        bodyB.m_contactList = c.m_nodeB.next;
      }
      this.m_contactFactory.Destroy(c);
      --this.m_contactCount;
    };
    b2ContactManager.prototype.Collide = function () {
      var c = this.m_world.m_contactList;
      while (c) {
        var fixtureA = c.GetFixtureA();
        var fixtureB = c.GetFixtureB();
        var bodyA = fixtureA.GetBody();
        var bodyB = fixtureB.GetBody();
        if (bodyA.IsAwake() == false && bodyB.IsAwake() == false) {
          c = c.GetNext();
          continue;
        }
        if (c.m_flags & b2Contact.e_filterFlag) {
          if (bodyB.ShouldCollide(bodyA) == false) {
            var cNuke = c;
            c = cNuke.GetNext();
            this.Destroy(cNuke);
            continue;
          }
          if (this.m_contactFilter.ShouldCollide(fixtureA, fixtureB) == false) {
            cNuke = c;
            c = cNuke.GetNext();
            this.Destroy(cNuke);
            continue;
          }
          c.m_flags &= ~b2Contact.e_filterFlag;
        }
        var proxyA = fixtureA.m_proxy;
        var proxyB = fixtureB.m_proxy;
        var overlap = this.m_broadPhase.TestOverlap(proxyA, proxyB);
        if (overlap == false) {
          cNuke = c;
          c = cNuke.GetNext();
          this.Destroy(cNuke);
          continue;
        }
        c.Update(this.m_contactListener);
        c = c.GetNext();
      }
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.b2ContactManager.s_evalCP = new b2ContactPoint();
    });
    b2DebugDraw.b2DebugDraw = function () {};
    b2DebugDraw.prototype.b2DebugDraw = function () {};
    b2DebugDraw.prototype.SetFlags = function (flags) {
      if (flags === undefined) flags = 0;
    };
    b2DebugDraw.prototype.GetFlags = function () {};
    b2DebugDraw.prototype.AppendFlags = function (flags) {
      if (flags === undefined) flags = 0;
    };
    b2DebugDraw.prototype.ClearFlags = function (flags) {
      if (flags === undefined) flags = 0;
    };
    b2DebugDraw.prototype.SetSprite = function (sprite) {};
    b2DebugDraw.prototype.GetSprite = function () {};
    b2DebugDraw.prototype.SetDrawScale = function (drawScale) {
      if (drawScale === undefined) drawScale = 0;
    };
    b2DebugDraw.prototype.GetDrawScale = function () {};
    b2DebugDraw.prototype.SetLineThickness = function (lineThickness) {
      if (lineThickness === undefined) lineThickness = 0;
    };
    b2DebugDraw.prototype.GetLineThickness = function () {};
    b2DebugDraw.prototype.SetAlpha = function (alpha) {
      if (alpha === undefined) alpha = 0;
    };
    b2DebugDraw.prototype.GetAlpha = function () {};
    b2DebugDraw.prototype.SetFillAlpha = function (alpha) {
      if (alpha === undefined) alpha = 0;
    };
    b2DebugDraw.prototype.GetFillAlpha = function () {};
    b2DebugDraw.prototype.SetXFormScale = function (xformScale) {
      if (xformScale === undefined) xformScale = 0;
    };
    b2DebugDraw.prototype.GetXFormScale = function () {};
    b2DebugDraw.prototype.DrawPolygon = function (
      vertices,
      vertexCount,
      color
    ) {
      if (vertexCount === undefined) vertexCount = 0;
    };
    b2DebugDraw.prototype.DrawSolidPolygon = function (
      vertices,
      vertexCount,
      color
    ) {
      if (vertexCount === undefined) vertexCount = 0;
    };
    b2DebugDraw.prototype.DrawCircle = function (center, radius, color) {
      if (radius === undefined) radius = 0;
    };
    b2DebugDraw.prototype.DrawSolidCircle = function (
      center,
      radius,
      axis,
      color
    ) {
      if (radius === undefined) radius = 0;
    };
    b2DebugDraw.prototype.DrawSegment = function (p1, p2, color) {};
    b2DebugDraw.prototype.DrawTransform = function (xf) {};
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.b2DebugDraw.e_shapeBit = 0x0001;
      Box2D.Dynamics.b2DebugDraw.e_jointBit = 0x0002;
      Box2D.Dynamics.b2DebugDraw.e_aabbBit = 0x0004;
      Box2D.Dynamics.b2DebugDraw.e_pairBit = 0x0008;
      Box2D.Dynamics.b2DebugDraw.e_centerOfMassBit = 0x0010;
      Box2D.Dynamics.b2DebugDraw.e_controllerBit = 0x0020;
    });
    b2DestructionListener.b2DestructionListener = function () {};
    b2DestructionListener.prototype.SayGoodbyeJoint = function (joint) {};
    b2DestructionListener.prototype.SayGoodbyeFixture = function (fixture) {};
    b2FilterData.b2FilterData = function () {
      this.categoryBits = 0x0001;
      this.maskBits = 0xffff;
      this.groupIndex = 0;
    };
    b2FilterData.prototype.Copy = function () {
      var copy = new b2FilterData();
      copy.categoryBits = this.categoryBits;
      copy.maskBits = this.maskBits;
      copy.groupIndex = this.groupIndex;
      return copy;
    };
    b2Fixture.b2Fixture = function () {
      this.m_filter = new b2FilterData();
    };
    b2Fixture.prototype.GetType = function () {
      return this.m_shape.GetType();
    };
    b2Fixture.prototype.GetShape = function () {
      return this.m_shape;
    };
    b2Fixture.prototype.SetSensor = function (sensor) {
      if (this.m_isSensor == sensor) return;
      this.m_isSensor = sensor;
      if (this.m_body == null) return;
      var edge = this.m_body.GetContactList();
      while (edge) {
        var contact = edge.contact;
        var fixtureA = contact.GetFixtureA();
        var fixtureB = contact.GetFixtureB();
        if (fixtureA == this || fixtureB == this)
          contact.SetSensor(fixtureA.IsSensor() || fixtureB.IsSensor());
        edge = edge.next;
      }
    };
    b2Fixture.prototype.IsSensor = function () {
      return this.m_isSensor;
    };
    b2Fixture.prototype.SetFilterData = function (filter) {
      this.m_filter = filter.Copy();
      if (this.m_body) return;
      var edge = this.m_body.GetContactList();
      while (edge) {
        var contact = edge.contact;
        var fixtureA = contact.GetFixtureA();
        var fixtureB = contact.GetFixtureB();
        if (fixtureA == this || fixtureB == this) contact.FlagForFiltering();
        edge = edge.next;
      }
    };
    b2Fixture.prototype.GetFilterData = function () {
      return this.m_filter.Copy();
    };
    b2Fixture.prototype.GetBody = function () {
      return this.m_body;
    };
    b2Fixture.prototype.GetNext = function () {
      return this.m_next;
    };
    b2Fixture.prototype.GetUserData = function () {
      return this.m_userData;
    };
    b2Fixture.prototype.SetUserData = function (data) {
      this.m_userData = data;
    };
    b2Fixture.prototype.TestPoint = function (p) {
      return this.m_shape.TestPoint(this.m_body.GetTransform(), p);
    };
    b2Fixture.prototype.RayCast = function (output, input) {
      return this.m_shape.RayCast(output, input, this.m_body.GetTransform());
    };
    b2Fixture.prototype.GetMassData = function (massData) {
      if (massData === undefined) massData = null;
      if (massData == null) {
        massData = new b2MassData();
      }
      this.m_shape.ComputeMass(massData, this.m_density);
      return massData;
    };
    b2Fixture.prototype.SetDensity = function (density) {
      if (density === undefined) density = 0;
      this.m_density = density;
    };
    b2Fixture.prototype.GetDensity = function () {
      return this.m_density;
    };
    b2Fixture.prototype.GetFriction = function () {
      return this.m_friction;
    };
    b2Fixture.prototype.SetFriction = function (friction) {
      if (friction === undefined) friction = 0;
      this.m_friction = friction;
    };
    b2Fixture.prototype.GetRestitution = function () {
      return this.m_restitution;
    };
    b2Fixture.prototype.SetRestitution = function (restitution) {
      if (restitution === undefined) restitution = 0;
      this.m_restitution = restitution;
    };
    b2Fixture.prototype.GetAABB = function () {
      return this.m_aabb;
    };
    b2Fixture.prototype.b2Fixture = function () {
      this.m_aabb = new b2AABB();
      this.m_userData = null;
      this.m_body = null;
      this.m_next = null;
      this.m_shape = null;
      this.m_density = 0.0;
      this.m_friction = 0.0;
      this.m_restitution = 0.0;
    };
    b2Fixture.prototype.Create = function (body, xf, def) {
      this.m_userData = def.userData;
      this.m_friction = def.friction;
      this.m_restitution = def.restitution;
      this.m_body = body;
      this.m_next = null;
      this.m_filter = def.filter.Copy();
      this.m_isSensor = def.isSensor;
      this.m_shape = def.shape.Copy();
      this.m_density = def.density;
    };
    b2Fixture.prototype.Destroy = function () {
      this.m_shape = null;
    };
    b2Fixture.prototype.CreateProxy = function (broadPhase, xf) {
      this.m_shape.ComputeAABB(this.m_aabb, xf);
      this.m_proxy = broadPhase.CreateProxy(this.m_aabb, this);
    };
    b2Fixture.prototype.DestroyProxy = function (broadPhase) {
      if (this.m_proxy == null) {
        return;
      }
      broadPhase.DestroyProxy(this.m_proxy);
      this.m_proxy = null;
    };
    b2Fixture.prototype.Synchronize = function (
      broadPhase,
      transform1,
      transform2
    ) {
      if (!this.m_proxy) return;
      var aabb1 = new b2AABB();
      var aabb2 = new b2AABB();
      this.m_shape.ComputeAABB(aabb1, transform1);
      this.m_shape.ComputeAABB(aabb2, transform2);
      this.m_aabb.Combine(aabb1, aabb2);
      var displacement = b2Math.SubtractVV(
        transform2.position,
        transform1.position
      );
      broadPhase.MoveProxy(this.m_proxy, this.m_aabb, displacement);
    };
    b2FixtureDef.b2FixtureDef = function () {
      this.filter = new b2FilterData();
    };
    b2FixtureDef.prototype.b2FixtureDef = function () {
      this.shape = null;
      this.userData = null;
      this.friction = 0.2;
      this.restitution = 0.0;
      this.density = 0.0;
      this.filter.categoryBits = 0x0001;
      this.filter.maskBits = 0xffff;
      this.filter.groupIndex = 0;
      this.isSensor = false;
    };
    b2Island.b2Island = function () {};
    b2Island.prototype.b2Island = function () {
      this.m_bodies = new Vector();
      this.m_contacts = new Vector();
      this.m_joints = new Vector();
    };
    b2Island.prototype.Initialize = function (
      bodyCapacity,
      contactCapacity,
      jointCapacity,
      allocator,
      listener,
      contactSolver
    ) {
      if (bodyCapacity === undefined) bodyCapacity = 0;
      if (contactCapacity === undefined) contactCapacity = 0;
      if (jointCapacity === undefined) jointCapacity = 0;
      var i = 0;
      this.m_bodyCapacity = bodyCapacity;
      this.m_contactCapacity = contactCapacity;
      this.m_jointCapacity = jointCapacity;
      this.m_bodyCount = 0;
      this.m_contactCount = 0;
      this.m_jointCount = 0;
      this.m_allocator = allocator;
      this.m_listener = listener;
      this.m_contactSolver = contactSolver;
      for (i = this.m_bodies.length; i < bodyCapacity; i++)
        this.m_bodies[i] = null;
      for (i = this.m_contacts.length; i < contactCapacity; i++)
        this.m_contacts[i] = null;
      for (i = this.m_joints.length; i < jointCapacity; i++)
        this.m_joints[i] = null;
    };
    b2Island.prototype.Clear = function () {
      this.m_bodyCount = 0;
      this.m_contactCount = 0;
      this.m_jointCount = 0;
    };
    b2Island.prototype.Solve = function (step, gravity, allowSleep) {
      var i = 0;
      var j = 0;
      var b;
      var joint;
      for (i = 0; i < this.m_bodyCount; ++i) {
        b = this.m_bodies[i];
        if (b.GetType() != b2Body.b2_dynamicBody) continue;
        b.m_linearVelocity.x +=
          step.dt * (gravity.x + b.m_invMass * b.m_force.x);
        b.m_linearVelocity.y +=
          step.dt * (gravity.y + b.m_invMass * b.m_force.y);
        b.m_angularVelocity += step.dt * b.m_invI * b.m_torque;
        b.m_linearVelocity.Multiply(
          b2Math.Clamp(1.0 - step.dt * b.m_linearDamping, 0.0, 1.0)
        );
        b.m_angularVelocity *= b2Math.Clamp(
          1.0 - step.dt * b.m_angularDamping,
          0.0,
          1.0
        );
      }
      this.m_contactSolver.Initialize(
        step,
        this.m_contacts,
        this.m_contactCount,
        this.m_allocator
      );
      var contactSolver = this.m_contactSolver;
      contactSolver.InitVelocityConstraints(step);
      for (i = 0; i < this.m_jointCount; ++i) {
        joint = this.m_joints[i];
        joint.InitVelocityConstraints(step);
      }
      for (i = 0; i < step.velocityIterations; ++i) {
        for (j = 0; j < this.m_jointCount; ++j) {
          joint = this.m_joints[j];
          joint.SolveVelocityConstraints(step);
        }
        contactSolver.SolveVelocityConstraints();
      }
      for (i = 0; i < this.m_jointCount; ++i) {
        joint = this.m_joints[i];
        joint.FinalizeVelocityConstraints();
      }
      contactSolver.FinalizeVelocityConstraints();
      for (i = 0; i < this.m_bodyCount; ++i) {
        b = this.m_bodies[i];
        if (b.GetType() == b2Body.b2_staticBody) continue;
        var translationX = step.dt * b.m_linearVelocity.x;
        var translationY = step.dt * b.m_linearVelocity.y;
        if (
          translationX * translationX + translationY * translationY >
          b2Settings.b2_maxTranslationSquared
        ) {
          b.m_linearVelocity.Normalize();
          b.m_linearVelocity.x *= b2Settings.b2_maxTranslation * step.inv_dt;
          b.m_linearVelocity.y *= b2Settings.b2_maxTranslation * step.inv_dt;
        }
        var rotation = step.dt * b.m_angularVelocity;
        if (rotation * rotation > b2Settings.b2_maxRotationSquared) {
          if (b.m_angularVelocity < 0.0) {
            b.m_angularVelocity = -b2Settings.b2_maxRotation * step.inv_dt;
          } else {
            b.m_angularVelocity = b2Settings.b2_maxRotation * step.inv_dt;
          }
        }
        b.m_sweep.c0.SetV(b.m_sweep.c);
        b.m_sweep.a0 = b.m_sweep.a;
        b.m_sweep.c.x += step.dt * b.m_linearVelocity.x;
        b.m_sweep.c.y += step.dt * b.m_linearVelocity.y;
        b.m_sweep.a += step.dt * b.m_angularVelocity;
        b.SynchronizeTransform();
      }
      for (i = 0; i < step.positionIterations; ++i) {
        var contactsOkay = contactSolver.SolvePositionConstraints(
          b2Settings.b2_contactBaumgarte
        );
        var jointsOkay = true;
        for (j = 0; j < this.m_jointCount; ++j) {
          joint = this.m_joints[j];
          var jointOkay = joint.SolvePositionConstraints(
            b2Settings.b2_contactBaumgarte
          );
          jointsOkay = jointsOkay && jointOkay;
        }
        if (contactsOkay && jointsOkay) {
          break;
        }
      }
      this.Report(contactSolver.m_constraints);
      if (allowSleep) {
        var minSleepTime = Number.MAX_VALUE;
        var linTolSqr =
          b2Settings.b2_linearSleepTolerance *
          b2Settings.b2_linearSleepTolerance;
        var angTolSqr =
          b2Settings.b2_angularSleepTolerance *
          b2Settings.b2_angularSleepTolerance;
        for (i = 0; i < this.m_bodyCount; ++i) {
          b = this.m_bodies[i];
          if (b.GetType() == b2Body.b2_staticBody) {
            continue;
          }
          if ((b.m_flags & b2Body.e_allowSleepFlag) == 0) {
            b.m_sleepTime = 0.0;
            minSleepTime = 0.0;
          }
          if (
            (b.m_flags & b2Body.e_allowSleepFlag) == 0 ||
            b.m_angularVelocity * b.m_angularVelocity > angTolSqr ||
            b2Math.Dot(b.m_linearVelocity, b.m_linearVelocity) > linTolSqr
          ) {
            b.m_sleepTime = 0.0;
            minSleepTime = 0.0;
          } else {
            b.m_sleepTime += step.dt;
            minSleepTime = b2Math.Min(minSleepTime, b.m_sleepTime);
          }
        }
        if (minSleepTime >= b2Settings.b2_timeToSleep) {
          for (i = 0; i < this.m_bodyCount; ++i) {
            b = this.m_bodies[i];
            b.SetAwake(false);
          }
        }
      }
    };
    b2Island.prototype.SolveTOI = function (subStep) {
      var i = 0;
      var j = 0;
      this.m_contactSolver.Initialize(
        subStep,
        this.m_contacts,
        this.m_contactCount,
        this.m_allocator
      );
      var contactSolver = this.m_contactSolver;
      for (i = 0; i < this.m_jointCount; ++i) {
        this.m_joints[i].InitVelocityConstraints(subStep);
      }
      for (i = 0; i < subStep.velocityIterations; ++i) {
        contactSolver.SolveVelocityConstraints();
        for (j = 0; j < this.m_jointCount; ++j) {
          this.m_joints[j].SolveVelocityConstraints(subStep);
        }
      }
      for (i = 0; i < this.m_bodyCount; ++i) {
        var b = this.m_bodies[i];
        if (b.GetType() == b2Body.b2_staticBody) continue;
        var translationX = subStep.dt * b.m_linearVelocity.x;
        var translationY = subStep.dt * b.m_linearVelocity.y;
        if (
          translationX * translationX + translationY * translationY >
          b2Settings.b2_maxTranslationSquared
        ) {
          b.m_linearVelocity.Normalize();
          b.m_linearVelocity.x *= b2Settings.b2_maxTranslation * subStep.inv_dt;
          b.m_linearVelocity.y *= b2Settings.b2_maxTranslation * subStep.inv_dt;
        }
        var rotation = subStep.dt * b.m_angularVelocity;
        if (rotation * rotation > b2Settings.b2_maxRotationSquared) {
          if (b.m_angularVelocity < 0.0) {
            b.m_angularVelocity = -b2Settings.b2_maxRotation * subStep.inv_dt;
          } else {
            b.m_angularVelocity = b2Settings.b2_maxRotation * subStep.inv_dt;
          }
        }
        b.m_sweep.c0.SetV(b.m_sweep.c);
        b.m_sweep.a0 = b.m_sweep.a;
        b.m_sweep.c.x += subStep.dt * b.m_linearVelocity.x;
        b.m_sweep.c.y += subStep.dt * b.m_linearVelocity.y;
        b.m_sweep.a += subStep.dt * b.m_angularVelocity;
        b.SynchronizeTransform();
      }
      var k_toiBaumgarte = 0.75;
      for (i = 0; i < subStep.positionIterations; ++i) {
        var contactsOkay =
          contactSolver.SolvePositionConstraints(k_toiBaumgarte);
        var jointsOkay = true;
        for (j = 0; j < this.m_jointCount; ++j) {
          var jointOkay = this.m_joints[j].SolvePositionConstraints(
            b2Settings.b2_contactBaumgarte
          );
          jointsOkay = jointsOkay && jointOkay;
        }
        if (contactsOkay && jointsOkay) {
          break;
        }
      }
      this.Report(contactSolver.m_constraints);
    };
    b2Island.prototype.Report = function (constraints) {
      if (this.m_listener == null) {
        return;
      }
      for (var i = 0; i < this.m_contactCount; ++i) {
        var c = this.m_contacts[i];
        var cc = constraints[i];
        for (var j = 0; j < cc.pointCount; ++j) {
          b2Island.s_impulse.normalImpulses[j] = cc.points[j].normalImpulse;
          b2Island.s_impulse.tangentImpulses[j] = cc.points[j].tangentImpulse;
        }
        this.m_listener.PostSolve(c, b2Island.s_impulse);
      }
    };
    b2Island.prototype.AddBody = function (body) {
      body.m_islandIndex = this.m_bodyCount;
      this.m_bodies[this.m_bodyCount++] = body;
    };
    b2Island.prototype.AddContact = function (contact) {
      this.m_contacts[this.m_contactCount++] = contact;
    };
    b2Island.prototype.AddJoint = function (joint) {
      this.m_joints[this.m_jointCount++] = joint;
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.b2Island.s_impulse = new b2ContactImpulse();
    });
    b2TimeStep.b2TimeStep = function () {};
    b2TimeStep.prototype.Set = function (step) {
      this.dt = step.dt;
      this.inv_dt = step.inv_dt;
      this.positionIterations = step.positionIterations;
      this.velocityIterations = step.velocityIterations;
      this.warmStarting = step.warmStarting;
    };
    b2World.b2World = function () {
      this.s_stack = new Vector();
      this.m_contactManager = new b2ContactManager();
      this.m_contactSolver = new b2ContactSolver();
      this.m_island = new b2Island();
    };
    b2World.prototype.b2World = function (gravity, doSleep) {
      this.m_destructionListener = null;
      this.m_debugDraw = null;
      this.m_bodyList = null;
      this.m_contactList = null;
      this.m_jointList = null;
      this.m_controllerList = null;
      this.m_bodyCount = 0;
      this.m_contactCount = 0;
      this.m_jointCount = 0;
      this.m_controllerCount = 0;
      b2World.m_warmStarting = true;
      b2World.m_continuousPhysics = true;
      this.m_allowSleep = doSleep;
      this.m_gravity = gravity;
      this.m_inv_dt0 = 0.0;
      this.m_contactManager.m_world = this;
      var bd = new b2BodyDef();
      this.m_groundBody = this.CreateBody(bd);
    };
    b2World.prototype.SetDestructionListener = function (listener) {
      this.m_destructionListener = listener;
    };
    b2World.prototype.SetContactFilter = function (filter) {
      this.m_contactManager.m_contactFilter = filter;
    };
    b2World.prototype.SetContactListener = function (listener) {
      this.m_contactManager.m_contactListener = listener;
    };
    b2World.prototype.SetDebugDraw = function (debugDraw) {
      this.m_debugDraw = debugDraw;
    };
    b2World.prototype.SetBroadPhase = function (broadPhase) {
      var oldBroadPhase = this.m_contactManager.m_broadPhase;
      this.m_contactManager.m_broadPhase = broadPhase;
      for (var b = this.m_bodyList; b; b = b.m_next) {
        for (var f = b.m_fixtureList; f; f = f.m_next) {
          f.m_proxy = broadPhase.CreateProxy(
            oldBroadPhase.GetFatAABB(f.m_proxy),
            f
          );
        }
      }
    };
    b2World.prototype.Validate = function () {
      this.m_contactManager.m_broadPhase.Validate();
    };
    b2World.prototype.GetProxyCount = function () {
      return this.m_contactManager.m_broadPhase.GetProxyCount();
    };
    b2World.prototype.CreateBody = function (def) {
      if (this.IsLocked() == true) {
        return null;
      }
      var b = new b2Body(def, this);
      b.m_prev = null;
      b.m_next = this.m_bodyList;
      if (this.m_bodyList) {
        this.m_bodyList.m_prev = b;
      }
      this.m_bodyList = b;
      ++this.m_bodyCount;
      return b;
    };
    b2World.prototype.DestroyBody = function (b) {
      if (this.IsLocked() == true) {
        return;
      }
      var jn = b.m_jointList;
      while (jn) {
        var jn0 = jn;
        jn = jn.next;
        if (this.m_destructionListener) {
          this.m_destructionListener.SayGoodbyeJoint(jn0.joint);
        }
        this.DestroyJoint(jn0.joint);
      }
      var coe = b.m_controllerList;
      while (coe) {
        var coe0 = coe;
        coe = coe.nextController;
        coe0.controller.RemoveBody(b);
      }
      var ce = b.m_contactList;
      while (ce) {
        var ce0 = ce;
        ce = ce.next;
        this.m_contactManager.Destroy(ce0.contact);
      }
      b.m_contactList = null;
      var f = b.m_fixtureList;
      while (f) {
        var f0 = f;
        f = f.m_next;
        if (this.m_destructionListener) {
          this.m_destructionListener.SayGoodbyeFixture(f0);
        }
        f0.DestroyProxy(this.m_contactManager.m_broadPhase);
        f0.Destroy();
      }
      b.m_fixtureList = null;
      b.m_fixtureCount = 0;
      if (b.m_prev) {
        b.m_prev.m_next = b.m_next;
      }
      if (b.m_next) {
        b.m_next.m_prev = b.m_prev;
      }
      if (b == this.m_bodyList) {
        this.m_bodyList = b.m_next;
      }
      --this.m_bodyCount;
    };
    b2World.prototype.CreateJoint = function (def) {
      var j = b2Joint.Create(def, null);
      j.m_prev = null;
      j.m_next = this.m_jointList;
      if (this.m_jointList) {
        this.m_jointList.m_prev = j;
      }
      this.m_jointList = j;
      ++this.m_jointCount;
      j.m_edgeA.joint = j;
      j.m_edgeA.other = j.m_bodyB;
      j.m_edgeA.prev = null;
      j.m_edgeA.next = j.m_bodyA.m_jointList;
      if (j.m_bodyA.m_jointList) j.m_bodyA.m_jointList.prev = j.m_edgeA;
      j.m_bodyA.m_jointList = j.m_edgeA;
      j.m_edgeB.joint = j;
      j.m_edgeB.other = j.m_bodyA;
      j.m_edgeB.prev = null;
      j.m_edgeB.next = j.m_bodyB.m_jointList;
      if (j.m_bodyB.m_jointList) j.m_bodyB.m_jointList.prev = j.m_edgeB;
      j.m_bodyB.m_jointList = j.m_edgeB;
      var bodyA = def.bodyA;
      var bodyB = def.bodyB;
      if (def.collideConnected == false) {
        var edge = bodyB.GetContactList();
        while (edge) {
          if (edge.other == bodyA) {
            edge.contact.FlagForFiltering();
          }
          edge = edge.next;
        }
      }
      return j;
    };
    b2World.prototype.DestroyJoint = function (j) {
      var collideConnected = j.m_collideConnected;
      if (j.m_prev) {
        j.m_prev.m_next = j.m_next;
      }
      if (j.m_next) {
        j.m_next.m_prev = j.m_prev;
      }
      if (j == this.m_jointList) {
        this.m_jointList = j.m_next;
      }
      var bodyA = j.m_bodyA;
      var bodyB = j.m_bodyB;
      bodyA.SetAwake(true);
      bodyB.SetAwake(true);
      if (j.m_edgeA.prev) {
        j.m_edgeA.prev.next = j.m_edgeA.next;
      }
      if (j.m_edgeA.next) {
        j.m_edgeA.next.prev = j.m_edgeA.prev;
      }
      if (j.m_edgeA == bodyA.m_jointList) {
        bodyA.m_jointList = j.m_edgeA.next;
      }
      j.m_edgeA.prev = null;
      j.m_edgeA.next = null;
      if (j.m_edgeB.prev) {
        j.m_edgeB.prev.next = j.m_edgeB.next;
      }
      if (j.m_edgeB.next) {
        j.m_edgeB.next.prev = j.m_edgeB.prev;
      }
      if (j.m_edgeB == bodyB.m_jointList) {
        bodyB.m_jointList = j.m_edgeB.next;
      }
      j.m_edgeB.prev = null;
      j.m_edgeB.next = null;
      b2Joint.Destroy(j, null);
      --this.m_jointCount;
      if (collideConnected == false) {
        var edge = bodyB.GetContactList();
        while (edge) {
          if (edge.other == bodyA) {
            edge.contact.FlagForFiltering();
          }
          edge = edge.next;
        }
      }
    };
    b2World.prototype.AddController = function (c) {
      c.m_next = this.m_controllerList;
      c.m_prev = null;
      this.m_controllerList = c;
      c.m_world = this;
      this.m_controllerCount++;
      return c;
    };
    b2World.prototype.RemoveController = function (c) {
      if (c.m_prev) c.m_prev.m_next = c.m_next;
      if (c.m_next) c.m_next.m_prev = c.m_prev;
      if (this.m_controllerList == c) this.m_controllerList = c.m_next;
      this.m_controllerCount--;
    };
    b2World.prototype.CreateController = function (controller) {
      if (controller.m_world != this)
        throw new Error("Controller can only be a member of one world");
      controller.m_next = this.m_controllerList;
      controller.m_prev = null;
      if (this.m_controllerList) this.m_controllerList.m_prev = controller;
      this.m_controllerList = controller;
      ++this.m_controllerCount;
      controller.m_world = this;
      return controller;
    };
    b2World.prototype.DestroyController = function (controller) {
      controller.Clear();
      if (controller.m_next) controller.m_next.m_prev = controller.m_prev;
      if (controller.m_prev) controller.m_prev.m_next = controller.m_next;
      if (controller == this.m_controllerList)
        this.m_controllerList = controller.m_next;
      --this.m_controllerCount;
    };
    b2World.prototype.SetWarmStarting = function (flag) {
      b2World.m_warmStarting = flag;
    };
    b2World.prototype.SetContinuousPhysics = function (flag) {
      b2World.m_continuousPhysics = flag;
    };
    b2World.prototype.GetBodyCount = function () {
      return this.m_bodyCount;
    };
    b2World.prototype.GetJointCount = function () {
      return this.m_jointCount;
    };
    b2World.prototype.GetContactCount = function () {
      return this.m_contactCount;
    };
    b2World.prototype.SetGravity = function (gravity) {
      this.m_gravity = gravity;
    };
    b2World.prototype.GetGravity = function () {
      return this.m_gravity;
    };
    b2World.prototype.GetGroundBody = function () {
      return this.m_groundBody;
    };
    b2World.prototype.Step = function (
      dt,
      velocityIterations,
      positionIterations
    ) {
      if (dt === undefined) dt = 0;
      if (velocityIterations === undefined) velocityIterations = 0;
      if (positionIterations === undefined) positionIterations = 0;
      if (this.m_flags & b2World.e_newFixture) {
        this.m_contactManager.FindNewContacts();
        this.m_flags &= ~b2World.e_newFixture;
      }
      this.m_flags |= b2World.e_locked;
      var step = b2World.s_timestep2;
      step.dt = dt;
      step.velocityIterations = velocityIterations;
      step.positionIterations = positionIterations;
      if (dt > 0.0) {
        step.inv_dt = 1.0 / dt;
      } else {
        step.inv_dt = 0.0;
      }
      step.dtRatio = this.m_inv_dt0 * dt;
      step.warmStarting = b2World.m_warmStarting;
      this.m_contactManager.Collide();
      if (step.dt > 0.0) {
        this.Solve(step);
      }
      if (b2World.m_continuousPhysics && step.dt > 0.0) {
        this.SolveTOI(step);
      }
      if (step.dt > 0.0) {
        this.m_inv_dt0 = step.inv_dt;
      }
      this.m_flags &= ~b2World.e_locked;
    };
    b2World.prototype.ClearForces = function () {
      for (var body = this.m_bodyList; body; body = body.m_next) {
        body.m_force.SetZero();
        body.m_torque = 0.0;
      }
    };
    b2World.prototype.DrawDebugData = function () {
      if (this.m_debugDraw == null) {
        return;
      }
      this.m_debugDraw.m_sprite.graphics.clear();
      var flags = this.m_debugDraw.GetFlags();
      var i = 0;
      var b;
      var f;
      var s;
      var j;
      var bp;
      var invQ = new b2Vec2();
      var x1 = new b2Vec2();
      var x2 = new b2Vec2();
      var xf;
      var b1 = new b2AABB();
      var b2 = new b2AABB();
      var vs = [new b2Vec2(), new b2Vec2(), new b2Vec2(), new b2Vec2()];
      var color = new b2Color(0, 0, 0);
      if (flags & b2DebugDraw.e_shapeBit) {
        for (b = this.m_bodyList; b; b = b.m_next) {
          xf = b.m_xf;
          for (f = b.GetFixtureList(); f; f = f.m_next) {
            s = f.GetShape();
            if (b.IsActive() == false) {
              color.Set(0.5, 0.5, 0.3);
              this.DrawShape(s, xf, color);
            } else if (b.GetType() == b2Body.b2_staticBody) {
              color.Set(0.5, 0.9, 0.5);
              this.DrawShape(s, xf, color);
            } else if (b.GetType() == b2Body.b2_kinematicBody) {
              color.Set(0.5, 0.5, 0.9);
              this.DrawShape(s, xf, color);
            } else if (b.IsAwake() == false) {
              color.Set(0.6, 0.6, 0.6);
              this.DrawShape(s, xf, color);
            } else {
              color.Set(0.9, 0.7, 0.7);
              this.DrawShape(s, xf, color);
            }
          }
        }
      }
      if (flags & b2DebugDraw.e_jointBit) {
        for (j = this.m_jointList; j; j = j.m_next) {
          this.DrawJoint(j);
        }
      }
      if (flags & b2DebugDraw.e_controllerBit) {
        for (var c = this.m_controllerList; c; c = c.m_next) {
          c.Draw(this.m_debugDraw);
        }
      }
      if (flags & b2DebugDraw.e_pairBit) {
        color.Set(0.3, 0.9, 0.9);
        for (
          var contact = this.m_contactManager.m_contactList;
          contact;
          contact = contact.GetNext()
        ) {
          var fixtureA = contact.GetFixtureA();
          var fixtureB = contact.GetFixtureB();
          var cA = fixtureA.GetAABB().GetCenter();
          var cB = fixtureB.GetAABB().GetCenter();
          this.m_debugDraw.DrawSegment(cA, cB, color);
        }
      }
      if (flags & b2DebugDraw.e_aabbBit) {
        bp = this.m_contactManager.m_broadPhase;
        vs = [new b2Vec2(), new b2Vec2(), new b2Vec2(), new b2Vec2()];
        for (b = this.m_bodyList; b; b = b.GetNext()) {
          if (b.IsActive() == false) {
            continue;
          }
          for (f = b.GetFixtureList(); f; f = f.GetNext()) {
            var aabb = bp.GetFatAABB(f.m_proxy);
            vs[0].Set(aabb.lowerBound.x, aabb.lowerBound.y);
            vs[1].Set(aabb.upperBound.x, aabb.lowerBound.y);
            vs[2].Set(aabb.upperBound.x, aabb.upperBound.y);
            vs[3].Set(aabb.lowerBound.x, aabb.upperBound.y);
            this.m_debugDraw.DrawPolygon(vs, 4, color);
          }
        }
      }
      if (flags & b2DebugDraw.e_centerOfMassBit) {
        for (b = this.m_bodyList; b; b = b.m_next) {
          xf = b2World.s_xf;
          xf.R = b.m_xf.R;
          xf.position = b.GetWorldCenter();
          this.m_debugDraw.DrawTransform(xf);
        }
      }
    };
    b2World.prototype.QueryAABB = function (callback, aabb) {
      var __this = this;
      var broadPhase = __this.m_contactManager.m_broadPhase;

      function WorldQueryWrapper(proxy) {
        return callback(broadPhase.GetUserData(proxy));
      }
      broadPhase.Query(WorldQueryWrapper, aabb);
    };
    b2World.prototype.QueryShape = function (callback, shape, transform) {
      var __this = this;
      if (transform === undefined) transform = null;
      if (transform == null) {
        transform = new b2Transform();
        transform.SetIdentity();
      }
      var broadPhase = __this.m_contactManager.m_broadPhase;

      function WorldQueryWrapper(proxy) {
        var fixture =
          broadPhase.GetUserData(proxy) instanceof b2Fixture
            ? broadPhase.GetUserData(proxy)
            : null;
        if (
          b2Shape.TestOverlap(
            shape,
            transform,
            fixture.GetShape(),
            fixture.GetBody().GetTransform()
          )
        )
          return callback(fixture);
        return true;
      }
      var aabb = new b2AABB();
      shape.ComputeAABB(aabb, transform);
      broadPhase.Query(WorldQueryWrapper, aabb);
    };
    b2World.prototype.QueryPoint = function (callback, p) {
      var __this = this;
      var broadPhase = __this.m_contactManager.m_broadPhase;

      function WorldQueryWrapper(proxy) {
        var fixture =
          broadPhase.GetUserData(proxy) instanceof b2Fixture
            ? broadPhase.GetUserData(proxy)
            : null;
        if (fixture.TestPoint(p)) return callback(fixture);
        return true;
      }
      var aabb = new b2AABB();
      aabb.lowerBound.Set(
        p.x - b2Settings.b2_linearSlop,
        p.y - b2Settings.b2_linearSlop
      );
      aabb.upperBound.Set(
        p.x + b2Settings.b2_linearSlop,
        p.y + b2Settings.b2_linearSlop
      );
      broadPhase.Query(WorldQueryWrapper, aabb);
    };
    b2World.prototype.RayCast = function (callback, point1, point2) {
      var __this = this;
      var broadPhase = __this.m_contactManager.m_broadPhase;
      var output = new b2RayCastOutput();

      function RayCastWrapper(input, proxy) {
        var userData = broadPhase.GetUserData(proxy);
        var fixture = userData instanceof b2Fixture ? userData : null;
        var hit = fixture.RayCast(output, input);
        if (hit) {
          var fraction = output.fraction;
          var point = new b2Vec2(
            (1.0 - fraction) * point1.x + fraction * point2.x,
            (1.0 - fraction) * point1.y + fraction * point2.y
          );
          return callback(fixture, point, output.normal, fraction);
        }
        return input.maxFraction;
      }
      var input = new b2RayCastInput(point1, point2);
      broadPhase.RayCast(RayCastWrapper, input);
    };
    b2World.prototype.RayCastOne = function (point1, point2) {
      var __this = this;
      var result;

      function RayCastOneWrapper(fixture, point, normal, fraction) {
        if (fraction === undefined) fraction = 0;
        result = fixture;
        return fraction;
      }
      __this.RayCast(RayCastOneWrapper, point1, point2);
      return result;
    };
    b2World.prototype.RayCastAll = function (point1, point2) {
      var __this = this;
      var result = new Vector();

      function RayCastAllWrapper(fixture, point, normal, fraction) {
        if (fraction === undefined) fraction = 0;
        result[result.length] = fixture;
        return 1;
      }
      __this.RayCast(RayCastAllWrapper, point1, point2);
      return result;
    };
    b2World.prototype.GetBodyList = function () {
      return this.m_bodyList;
    };
    b2World.prototype.GetJointList = function () {
      return this.m_jointList;
    };
    b2World.prototype.GetContactList = function () {
      return this.m_contactList;
    };
    b2World.prototype.IsLocked = function () {
      return (this.m_flags & b2World.e_locked) > 0;
    };
    b2World.prototype.Solve = function (step) {
      var b;
      for (
        var controller = this.m_controllerList;
        controller;
        controller = controller.m_next
      ) {
        controller.Step(step);
      }
      var island = this.m_island;
      island.Initialize(
        this.m_bodyCount,
        this.m_contactCount,
        this.m_jointCount,
        null,
        this.m_contactManager.m_contactListener,
        this.m_contactSolver
      );
      for (b = this.m_bodyList; b; b = b.m_next) {
        b.m_flags &= ~b2Body.e_islandFlag;
      }
      for (var c = this.m_contactList; c; c = c.m_next) {
        c.m_flags &= ~b2Contact.e_islandFlag;
      }
      for (var j = this.m_jointList; j; j = j.m_next) {
        j.m_islandFlag = false;
      }
      var stackSize = parseInt(this.m_bodyCount);
      var stack = this.s_stack;
      for (var seed = this.m_bodyList; seed; seed = seed.m_next) {
        if (seed.m_flags & b2Body.e_islandFlag) {
          continue;
        }
        if (seed.IsAwake() == false || seed.IsActive() == false) {
          continue;
        }
        if (seed.GetType() == b2Body.b2_staticBody) {
          continue;
        }
        island.Clear();
        var stackCount = 0;
        stack[stackCount++] = seed;
        seed.m_flags |= b2Body.e_islandFlag;
        while (stackCount > 0) {
          b = stack[--stackCount];
          island.AddBody(b);
          if (b.IsAwake() == false) {
            b.SetAwake(true);
          }
          if (b.GetType() == b2Body.b2_staticBody) {
            continue;
          }
          var other;
          for (var ce = b.m_contactList; ce; ce = ce.next) {
            if (ce.contact.m_flags & b2Contact.e_islandFlag) {
              continue;
            }
            if (
              ce.contact.IsSensor() == true ||
              ce.contact.IsEnabled() == false ||
              ce.contact.IsTouching() == false
            ) {
              continue;
            }
            island.AddContact(ce.contact);
            ce.contact.m_flags |= b2Contact.e_islandFlag;
            other = ce.other;
            if (other.m_flags & b2Body.e_islandFlag) {
              continue;
            }
            stack[stackCount++] = other;
            other.m_flags |= b2Body.e_islandFlag;
          }
          for (var jn = b.m_jointList; jn; jn = jn.next) {
            if (jn.joint.m_islandFlag == true) {
              continue;
            }
            other = jn.other;
            if (other.IsActive() == false) {
              continue;
            }
            island.AddJoint(jn.joint);
            jn.joint.m_islandFlag = true;
            if (other.m_flags & b2Body.e_islandFlag) {
              continue;
            }
            stack[stackCount++] = other;
            other.m_flags |= b2Body.e_islandFlag;
          }
        }
        island.Solve(step, this.m_gravity, this.m_allowSleep);
        for (var i = 0; i < island.m_bodyCount; ++i) {
          b = island.m_bodies[i];
          if (b.GetType() == b2Body.b2_staticBody) {
            b.m_flags &= ~b2Body.e_islandFlag;
          }
        }
      }
      for (i = 0; i < stack.length; ++i) {
        if (!stack[i]) break;
        stack[i] = null;
      }
      for (b = this.m_bodyList; b; b = b.m_next) {
        if (b.IsAwake() == false || b.IsActive() == false) {
          continue;
        }
        if (b.GetType() == b2Body.b2_staticBody) {
          continue;
        }
        b.SynchronizeFixtures();
      }
      this.m_contactManager.FindNewContacts();
    };
    b2World.prototype.SolveTOI = function (step) {
      var b;
      var fA;
      var fB;
      var bA;
      var bB;
      var cEdge;
      var j;
      var island = this.m_island;
      island.Initialize(
        this.m_bodyCount,
        b2Settings.b2_maxTOIContactsPerIsland,
        b2Settings.b2_maxTOIJointsPerIsland,
        null,
        this.m_contactManager.m_contactListener,
        this.m_contactSolver
      );
      var queue = b2World.s_queue;
      for (b = this.m_bodyList; b; b = b.m_next) {
        b.m_flags &= ~b2Body.e_islandFlag;
        b.m_sweep.t0 = 0.0;
      }
      var c;
      for (c = this.m_contactList; c; c = c.m_next) {
        c.m_flags &= ~(b2Contact.e_toiFlag | b2Contact.e_islandFlag);
      }
      for (j = this.m_jointList; j; j = j.m_next) {
        j.m_islandFlag = false;
      }
      for (;;) {
        var minContact = null;
        var minTOI = 1.0;
        for (c = this.m_contactList; c; c = c.m_next) {
          if (
            c.IsSensor() == true ||
            c.IsEnabled() == false ||
            c.IsContinuous() == false
          ) {
            continue;
          }
          var toi = 1.0;
          if (c.m_flags & b2Contact.e_toiFlag) {
            toi = c.m_toi;
          } else {
            fA = c.m_fixtureA;
            fB = c.m_fixtureB;
            bA = fA.m_body;
            bB = fB.m_body;
            if (
              (bA.GetType() != b2Body.b2_dynamicBody ||
                bA.IsAwake() == false) &&
              (bB.GetType() != b2Body.b2_dynamicBody || bB.IsAwake() == false)
            ) {
              continue;
            }
            var t0 = bA.m_sweep.t0;
            if (bA.m_sweep.t0 < bB.m_sweep.t0) {
              t0 = bB.m_sweep.t0;
              bA.m_sweep.Advance(t0);
            } else if (bB.m_sweep.t0 < bA.m_sweep.t0) {
              t0 = bA.m_sweep.t0;
              bB.m_sweep.Advance(t0);
            }
            toi = c.ComputeTOI(bA.m_sweep, bB.m_sweep);
            b2Settings.b2Assert(0.0 <= toi && toi <= 1.0);
            if (toi > 0.0 && toi < 1.0) {
              toi = (1.0 - toi) * t0 + toi;
              if (toi > 1) toi = 1;
            }
            c.m_toi = toi;
            c.m_flags |= b2Contact.e_toiFlag;
          }
          if (Number.MIN_VALUE < toi && toi < minTOI) {
            minContact = c;
            minTOI = toi;
          }
        }
        if (minContact == null || 1.0 - 100.0 * Number.MIN_VALUE < minTOI) {
          break;
        }
        fA = minContact.m_fixtureA;
        fB = minContact.m_fixtureB;
        bA = fA.m_body;
        bB = fB.m_body;
        b2World.s_backupA.Set(bA.m_sweep);
        b2World.s_backupB.Set(bB.m_sweep);
        bA.Advance(minTOI);
        bB.Advance(minTOI);
        minContact.Update(this.m_contactManager.m_contactListener);
        minContact.m_flags &= ~b2Contact.e_toiFlag;
        if (minContact.IsSensor() == true || minContact.IsEnabled() == false) {
          bA.m_sweep.Set(b2World.s_backupA);
          bB.m_sweep.Set(b2World.s_backupB);
          bA.SynchronizeTransform();
          bB.SynchronizeTransform();
          continue;
        }
        if (minContact.IsTouching() == false) {
          continue;
        }
        var seed = bA;
        if (seed.GetType() != b2Body.b2_dynamicBody) {
          seed = bB;
        }
        island.Clear();
        var queueStart = 0;
        var queueSize = 0;
        queue[queueStart + queueSize++] = seed;
        seed.m_flags |= b2Body.e_islandFlag;
        while (queueSize > 0) {
          b = queue[queueStart++];
          --queueSize;
          island.AddBody(b);
          if (b.IsAwake() == false) {
            b.SetAwake(true);
          }
          if (b.GetType() != b2Body.b2_dynamicBody) {
            continue;
          }
          for (cEdge = b.m_contactList; cEdge; cEdge = cEdge.next) {
            if (island.m_contactCount == island.m_contactCapacity) {
              break;
            }
            if (cEdge.contact.m_flags & b2Contact.e_islandFlag) {
              continue;
            }
            if (
              cEdge.contact.IsSensor() == true ||
              cEdge.contact.IsEnabled() == false ||
              cEdge.contact.IsTouching() == false
            ) {
              continue;
            }
            island.AddContact(cEdge.contact);
            cEdge.contact.m_flags |= b2Contact.e_islandFlag;
            var other = cEdge.other;
            if (other.m_flags & b2Body.e_islandFlag) {
              continue;
            }
            if (other.GetType() != b2Body.b2_staticBody) {
              other.Advance(minTOI);
              other.SetAwake(true);
            }
            queue[queueStart + queueSize] = other;
            ++queueSize;
            other.m_flags |= b2Body.e_islandFlag;
          }
          for (var jEdge = b.m_jointList; jEdge; jEdge = jEdge.next) {
            if (island.m_jointCount == island.m_jointCapacity) continue;
            if (jEdge.joint.m_islandFlag == true) continue;
            other = jEdge.other;
            if (other.IsActive() == false) {
              continue;
            }
            island.AddJoint(jEdge.joint);
            jEdge.joint.m_islandFlag = true;
            if (other.m_flags & b2Body.e_islandFlag) continue;
            if (other.GetType() != b2Body.b2_staticBody) {
              other.Advance(minTOI);
              other.SetAwake(true);
            }
            queue[queueStart + queueSize] = other;
            ++queueSize;
            other.m_flags |= b2Body.e_islandFlag;
          }
        }
        var subStep = b2World.s_timestep;
        subStep.warmStarting = false;
        subStep.dt = (1.0 - minTOI) * step.dt;
        subStep.inv_dt = 1.0 / subStep.dt;
        subStep.dtRatio = 0.0;
        subStep.velocityIterations = step.velocityIterations;
        subStep.positionIterations = step.positionIterations;
        island.SolveTOI(subStep);
        var i = 0;
        for (i = 0; i < island.m_bodyCount; ++i) {
          b = island.m_bodies[i];
          b.m_flags &= ~b2Body.e_islandFlag;
          if (b.IsAwake() == false) {
            continue;
          }
          if (b.GetType() != b2Body.b2_dynamicBody) {
            continue;
          }
          b.SynchronizeFixtures();
          for (cEdge = b.m_contactList; cEdge; cEdge = cEdge.next) {
            cEdge.contact.m_flags &= ~b2Contact.e_toiFlag;
          }
        }
        for (i = 0; i < island.m_contactCount; ++i) {
          c = island.m_contacts[i];
          c.m_flags &= ~(b2Contact.e_toiFlag | b2Contact.e_islandFlag);
        }
        for (i = 0; i < island.m_jointCount; ++i) {
          j = island.m_joints[i];
          j.m_islandFlag = false;
        }
        this.m_contactManager.FindNewContacts();
      }
    };
    b2World.prototype.DrawJoint = function (joint) {
      var b1 = joint.GetBodyA();
      var b2 = joint.GetBodyB();
      var xf1 = b1.m_xf;
      var xf2 = b2.m_xf;
      var x1 = xf1.position;
      var x2 = xf2.position;
      var p1 = joint.GetAnchorA();
      var p2 = joint.GetAnchorB();
      var color = b2World.s_jointColor;
      switch (joint.m_type) {
        case b2Joint.e_distanceJoint:
          this.m_debugDraw.DrawSegment(p1, p2, color);
          break;
        case b2Joint.e_pulleyJoint:
          {
            var pulley = joint instanceof b2PulleyJoint ? joint : null;
            var s1 = pulley.GetGroundAnchorA();
            var s2 = pulley.GetGroundAnchorB();
            this.m_debugDraw.DrawSegment(s1, p1, color);
            this.m_debugDraw.DrawSegment(s2, p2, color);
            this.m_debugDraw.DrawSegment(s1, s2, color);
          }
          break;
        case b2Joint.e_mouseJoint:
          this.m_debugDraw.DrawSegment(p1, p2, color);
          break;
        default:
          if (b1 != this.m_groundBody)
            this.m_debugDraw.DrawSegment(x1, p1, color);
          this.m_debugDraw.DrawSegment(p1, p2, color);
          if (b2 != this.m_groundBody)
            this.m_debugDraw.DrawSegment(x2, p2, color);
      }
    };
    b2World.prototype.DrawShape = function (shape, xf, color) {
      switch (shape.m_type) {
        case b2Shape.e_circleShape:
          {
            var circle = shape instanceof b2CircleShape ? shape : null;
            var center = b2Math.MulX(xf, circle.m_p);
            var radius = circle.m_radius;
            var axis = xf.R.col1;
            this.m_debugDraw.DrawSolidCircle(center, radius, axis, color);
          }
          break;
        case b2Shape.e_polygonShape:
          {
            var i = 0;
            var poly = shape instanceof b2PolygonShape ? shape : null;
            var vertexCount = parseInt(poly.GetVertexCount());
            var localVertices = poly.GetVertices();
            var vertices = new Vector(vertexCount);
            for (i = 0; i < vertexCount; ++i) {
              vertices[i] = b2Math.MulX(xf, localVertices[i]);
            }
            this.m_debugDraw.DrawSolidPolygon(vertices, vertexCount, color);
          }
          break;
        case b2Shape.e_edgeShape:
          {
            var edge = shape instanceof b2EdgeShape ? shape : null;
            this.m_debugDraw.DrawSegment(
              b2Math.MulX(xf, edge.GetVertex1()),
              b2Math.MulX(xf, edge.GetVertex2()),
              color
            );
          }
          break;
      }
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.b2World.s_timestep2 = new b2TimeStep();
      Box2D.Dynamics.b2World.s_xf = new b2Transform();
      Box2D.Dynamics.b2World.s_backupA = new b2Sweep();
      Box2D.Dynamics.b2World.s_backupB = new b2Sweep();
      Box2D.Dynamics.b2World.s_timestep = new b2TimeStep();
      Box2D.Dynamics.b2World.s_queue = new Vector();
      Box2D.Dynamics.b2World.s_jointColor = new b2Color(0.5, 0.8, 0.8);
      Box2D.Dynamics.b2World.e_newFixture = 0x0001;
      Box2D.Dynamics.b2World.e_locked = 0x0002;
    });
  })();
  (function () {
    var b2CircleShape = Box2D.Collision.Shapes.b2CircleShape,
      b2EdgeChainDef = Box2D.Collision.Shapes.b2EdgeChainDef,
      b2EdgeShape = Box2D.Collision.Shapes.b2EdgeShape,
      b2MassData = Box2D.Collision.Shapes.b2MassData,
      b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape,
      b2Shape = Box2D.Collision.Shapes.b2Shape,
      b2CircleContact = Box2D.Dynamics.Contacts.b2CircleContact,
      b2Contact = Box2D.Dynamics.Contacts.b2Contact,
      b2ContactConstraint = Box2D.Dynamics.Contacts.b2ContactConstraint,
      b2ContactConstraintPoint =
        Box2D.Dynamics.Contacts.b2ContactConstraintPoint,
      b2ContactEdge = Box2D.Dynamics.Contacts.b2ContactEdge,
      b2ContactFactory = Box2D.Dynamics.Contacts.b2ContactFactory,
      b2ContactRegister = Box2D.Dynamics.Contacts.b2ContactRegister,
      b2ContactResult = Box2D.Dynamics.Contacts.b2ContactResult,
      b2ContactSolver = Box2D.Dynamics.Contacts.b2ContactSolver,
      b2EdgeAndCircleContact = Box2D.Dynamics.Contacts.b2EdgeAndCircleContact,
      b2NullContact = Box2D.Dynamics.Contacts.b2NullContact,
      b2PolyAndCircleContact = Box2D.Dynamics.Contacts.b2PolyAndCircleContact,
      b2PolyAndEdgeContact = Box2D.Dynamics.Contacts.b2PolyAndEdgeContact,
      b2PolygonContact = Box2D.Dynamics.Contacts.b2PolygonContact,
      b2PositionSolverManifold =
        Box2D.Dynamics.Contacts.b2PositionSolverManifold,
      b2Body = Box2D.Dynamics.b2Body,
      b2BodyDef = Box2D.Dynamics.b2BodyDef,
      b2ContactFilter = Box2D.Dynamics.b2ContactFilter,
      b2ContactImpulse = Box2D.Dynamics.b2ContactImpulse,
      b2ContactListener = Box2D.Dynamics.b2ContactListener,
      b2ContactManager = Box2D.Dynamics.b2ContactManager,
      b2DebugDraw = Box2D.Dynamics.b2DebugDraw,
      b2DestructionListener = Box2D.Dynamics.b2DestructionListener,
      b2FilterData = Box2D.Dynamics.b2FilterData,
      b2Fixture = Box2D.Dynamics.b2Fixture,
      b2FixtureDef = Box2D.Dynamics.b2FixtureDef,
      b2Island = Box2D.Dynamics.b2Island,
      b2TimeStep = Box2D.Dynamics.b2TimeStep,
      b2World = Box2D.Dynamics.b2World,
      b2Color = Box2D.Common.b2Color,
      b2internal = Box2D.Common.b2internal,
      b2Settings = Box2D.Common.b2Settings,
      b2Mat22 = Box2D.Common.Math.b2Mat22,
      b2Mat33 = Box2D.Common.Math.b2Mat33,
      b2Math = Box2D.Common.Math.b2Math,
      b2Sweep = Box2D.Common.Math.b2Sweep,
      b2Transform = Box2D.Common.Math.b2Transform,
      b2Vec2 = Box2D.Common.Math.b2Vec2,
      b2Vec3 = Box2D.Common.Math.b2Vec3,
      b2AABB = Box2D.Collision.b2AABB,
      b2Bound = Box2D.Collision.b2Bound,
      b2BoundValues = Box2D.Collision.b2BoundValues,
      b2Collision = Box2D.Collision.b2Collision,
      b2ContactID = Box2D.Collision.b2ContactID,
      b2ContactPoint = Box2D.Collision.b2ContactPoint,
      b2Distance = Box2D.Collision.b2Distance,
      b2DistanceInput = Box2D.Collision.b2DistanceInput,
      b2DistanceOutput = Box2D.Collision.b2DistanceOutput,
      b2DistanceProxy = Box2D.Collision.b2DistanceProxy,
      b2DynamicTree = Box2D.Collision.b2DynamicTree,
      b2DynamicTreeBroadPhase = Box2D.Collision.b2DynamicTreeBroadPhase,
      b2DynamicTreeNode = Box2D.Collision.b2DynamicTreeNode,
      b2DynamicTreePair = Box2D.Collision.b2DynamicTreePair,
      b2Manifold = Box2D.Collision.b2Manifold,
      b2ManifoldPoint = Box2D.Collision.b2ManifoldPoint,
      b2Point = Box2D.Collision.b2Point,
      b2RayCastInput = Box2D.Collision.b2RayCastInput,
      b2RayCastOutput = Box2D.Collision.b2RayCastOutput,
      b2Segment = Box2D.Collision.b2Segment,
      b2SeparationFunction = Box2D.Collision.b2SeparationFunction,
      b2Simplex = Box2D.Collision.b2Simplex,
      b2SimplexCache = Box2D.Collision.b2SimplexCache,
      b2SimplexVertex = Box2D.Collision.b2SimplexVertex,
      b2TimeOfImpact = Box2D.Collision.b2TimeOfImpact,
      b2TOIInput = Box2D.Collision.b2TOIInput,
      b2WorldManifold = Box2D.Collision.b2WorldManifold,
      ClipVertex = Box2D.Collision.ClipVertex,
      Features = Box2D.Collision.Features,
      IBroadPhase = Box2D.Collision.IBroadPhase;

    Box2D.inherit(b2CircleContact, Box2D.Dynamics.Contacts.b2Contact);
    b2CircleContact.prototype.__super =
      Box2D.Dynamics.Contacts.b2Contact.prototype;
    b2CircleContact.b2CircleContact = function () {
      Box2D.Dynamics.Contacts.b2Contact.b2Contact.apply(this, arguments);
    };
    b2CircleContact.Create = function (allocator) {
      return new b2CircleContact();
    };
    b2CircleContact.Destroy = function (contact, allocator) {};
    b2CircleContact.prototype.Reset = function (fixtureA, fixtureB) {
      this.__super.Reset.call(this, fixtureA, fixtureB);
    };
    b2CircleContact.prototype.Evaluate = function () {
      var bA = this.m_fixtureA.GetBody();
      var bB = this.m_fixtureB.GetBody();
      b2Collision.CollideCircles(
        this.m_manifold,
        this.m_fixtureA.GetShape() instanceof b2CircleShape
          ? this.m_fixtureA.GetShape()
          : null,
        bA.m_xf,
        this.m_fixtureB.GetShape() instanceof b2CircleShape
          ? this.m_fixtureB.GetShape()
          : null,
        bB.m_xf
      );
    };
    b2Contact.b2Contact = function () {
      this.m_nodeA = new b2ContactEdge();
      this.m_nodeB = new b2ContactEdge();
      this.m_manifold = new b2Manifold();
      this.m_oldManifold = new b2Manifold();
    };
    b2Contact.prototype.GetManifold = function () {
      return this.m_manifold;
    };
    b2Contact.prototype.GetWorldManifold = function (worldManifold) {
      var bodyA = this.m_fixtureA.GetBody();
      var bodyB = this.m_fixtureB.GetBody();
      var shapeA = this.m_fixtureA.GetShape();
      var shapeB = this.m_fixtureB.GetShape();
      worldManifold.Initialize(
        this.m_manifold,
        bodyA.GetTransform(),
        shapeA.m_radius,
        bodyB.GetTransform(),
        shapeB.m_radius
      );
    };
    b2Contact.prototype.IsTouching = function () {
      return (
        (this.m_flags & b2Contact.e_touchingFlag) == b2Contact.e_touchingFlag
      );
    };
    b2Contact.prototype.IsContinuous = function () {
      return (
        (this.m_flags & b2Contact.e_continuousFlag) ==
        b2Contact.e_continuousFlag
      );
    };
    b2Contact.prototype.SetSensor = function (sensor) {
      if (sensor) {
        this.m_flags |= b2Contact.e_sensorFlag;
      } else {
        this.m_flags &= ~b2Contact.e_sensorFlag;
      }
    };
    b2Contact.prototype.IsSensor = function () {
      return (this.m_flags & b2Contact.e_sensorFlag) == b2Contact.e_sensorFlag;
    };
    b2Contact.prototype.SetEnabled = function (flag) {
      if (flag) {
        this.m_flags |= b2Contact.e_enabledFlag;
      } else {
        this.m_flags &= ~b2Contact.e_enabledFlag;
      }
    };
    b2Contact.prototype.IsEnabled = function () {
      return (
        (this.m_flags & b2Contact.e_enabledFlag) == b2Contact.e_enabledFlag
      );
    };
    b2Contact.prototype.GetNext = function () {
      return this.m_next;
    };
    b2Contact.prototype.GetFixtureA = function () {
      return this.m_fixtureA;
    };
    b2Contact.prototype.GetFixtureB = function () {
      return this.m_fixtureB;
    };
    b2Contact.prototype.FlagForFiltering = function () {
      this.m_flags |= b2Contact.e_filterFlag;
    };
    b2Contact.prototype.b2Contact = function () {};
    b2Contact.prototype.Reset = function (fixtureA, fixtureB) {
      if (fixtureA === undefined) fixtureA = null;
      if (fixtureB === undefined) fixtureB = null;
      this.m_flags = b2Contact.e_enabledFlag;
      if (!fixtureA || !fixtureB) {
        this.m_fixtureA = null;
        this.m_fixtureB = null;
        return;
      }
      if (fixtureA.IsSensor() || fixtureB.IsSensor()) {
        this.m_flags |= b2Contact.e_sensorFlag;
      }
      var bodyA = fixtureA.GetBody();
      var bodyB = fixtureB.GetBody();
      if (
        bodyA.GetType() != b2Body.b2_dynamicBody ||
        bodyA.IsBullet() ||
        bodyB.GetType() != b2Body.b2_dynamicBody ||
        bodyB.IsBullet()
      ) {
        this.m_flags |= b2Contact.e_continuousFlag;
      }
      this.m_fixtureA = fixtureA;
      this.m_fixtureB = fixtureB;
      this.m_manifold.m_pointCount = 0;
      this.m_prev = null;
      this.m_next = null;
      this.m_nodeA.contact = null;
      this.m_nodeA.prev = null;
      this.m_nodeA.next = null;
      this.m_nodeA.other = null;
      this.m_nodeB.contact = null;
      this.m_nodeB.prev = null;
      this.m_nodeB.next = null;
      this.m_nodeB.other = null;
    };
    b2Contact.prototype.Update = function (listener) {
      var tManifold = this.m_oldManifold;
      this.m_oldManifold = this.m_manifold;
      this.m_manifold = tManifold;
      this.m_flags |= b2Contact.e_enabledFlag;
      var touching = false;
      var wasTouching =
        (this.m_flags & b2Contact.e_touchingFlag) == b2Contact.e_touchingFlag;
      var bodyA = this.m_fixtureA.m_body;
      var bodyB = this.m_fixtureB.m_body;
      var aabbOverlap = this.m_fixtureA.m_aabb.TestOverlap(
        this.m_fixtureB.m_aabb
      );
      if (this.m_flags & b2Contact.e_sensorFlag) {
        if (aabbOverlap) {
          var shapeA = this.m_fixtureA.GetShape();
          var shapeB = this.m_fixtureB.GetShape();
          var xfA = bodyA.GetTransform();
          var xfB = bodyB.GetTransform();
          touching = b2Shape.TestOverlap(shapeA, xfA, shapeB, xfB);
        }
        this.m_manifold.m_pointCount = 0;
      } else {
        if (
          bodyA.GetType() != b2Body.b2_dynamicBody ||
          bodyA.IsBullet() ||
          bodyB.GetType() != b2Body.b2_dynamicBody ||
          bodyB.IsBullet()
        ) {
          this.m_flags |= b2Contact.e_continuousFlag;
        } else {
          this.m_flags &= ~b2Contact.e_continuousFlag;
        }
        if (aabbOverlap) {
          this.Evaluate();
          touching = this.m_manifold.m_pointCount > 0;
          for (var i = 0; i < this.m_manifold.m_pointCount; ++i) {
            var mp2 = this.m_manifold.m_points[i];
            mp2.m_normalImpulse = 0.0;
            mp2.m_tangentImpulse = 0.0;
            var id2 = mp2.m_id;
            for (var j = 0; j < this.m_oldManifold.m_pointCount; ++j) {
              var mp1 = this.m_oldManifold.m_points[j];
              if (mp1.m_id.key == id2.key) {
                mp2.m_normalImpulse = mp1.m_normalImpulse;
                mp2.m_tangentImpulse = mp1.m_tangentImpulse;
                break;
              }
            }
          }
        } else {
          this.m_manifold.m_pointCount = 0;
        }
        if (touching != wasTouching) {
          bodyA.SetAwake(true);
          bodyB.SetAwake(true);
        }
      }
      if (touching) {
        this.m_flags |= b2Contact.e_touchingFlag;
      } else {
        this.m_flags &= ~b2Contact.e_touchingFlag;
      }
      if (wasTouching == false && touching == true) {
        listener.BeginContact(this);
      }
      if (wasTouching == true && touching == false) {
        listener.EndContact(this);
      }
      if ((this.m_flags & b2Contact.e_sensorFlag) == 0) {
        listener.PreSolve(this, this.m_oldManifold);
      }
    };
    b2Contact.prototype.Evaluate = function () {};
    b2Contact.prototype.ComputeTOI = function (sweepA, sweepB) {
      b2Contact.s_input.proxyA.Set(this.m_fixtureA.GetShape());
      b2Contact.s_input.proxyB.Set(this.m_fixtureB.GetShape());
      b2Contact.s_input.sweepA = sweepA;
      b2Contact.s_input.sweepB = sweepB;
      b2Contact.s_input.tolerance = b2Settings.b2_linearSlop;
      return b2TimeOfImpact.TimeOfImpact(b2Contact.s_input);
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.Contacts.b2Contact.e_sensorFlag = 0x0001;
      Box2D.Dynamics.Contacts.b2Contact.e_continuousFlag = 0x0002;
      Box2D.Dynamics.Contacts.b2Contact.e_islandFlag = 0x0004;
      Box2D.Dynamics.Contacts.b2Contact.e_toiFlag = 0x0008;
      Box2D.Dynamics.Contacts.b2Contact.e_touchingFlag = 0x0010;
      Box2D.Dynamics.Contacts.b2Contact.e_enabledFlag = 0x0020;
      Box2D.Dynamics.Contacts.b2Contact.e_filterFlag = 0x0040;
      Box2D.Dynamics.Contacts.b2Contact.s_input = new b2TOIInput();
    });
    b2ContactConstraint.b2ContactConstraint = function () {
      this.localPlaneNormal = new b2Vec2();
      this.localPoint = new b2Vec2();
      this.normal = new b2Vec2();
      this.normalMass = new b2Mat22();
      this.K = new b2Mat22();
    };
    b2ContactConstraint.prototype.b2ContactConstraint = function () {
      this.points = new Vector(b2Settings.b2_maxManifoldPoints);
      for (var i = 0; i < b2Settings.b2_maxManifoldPoints; i++) {
        this.points[i] = new b2ContactConstraintPoint();
      }
    };
    b2ContactConstraintPoint.b2ContactConstraintPoint = function () {
      this.localPoint = new b2Vec2();
      this.rA = new b2Vec2();
      this.rB = new b2Vec2();
    };
    b2ContactEdge.b2ContactEdge = function () {};
    b2ContactFactory.b2ContactFactory = function () {};
    b2ContactFactory.prototype.b2ContactFactory = function (allocator) {
      this.m_allocator = allocator;
      this.InitializeRegisters();
    };
    b2ContactFactory.prototype.AddType = function (
      createFcn,
      destroyFcn,
      type1,
      type2
    ) {
      if (type1 === undefined) type1 = 0;
      if (type2 === undefined) type2 = 0;
      this.m_registers[type1][type2].createFcn = createFcn;
      this.m_registers[type1][type2].destroyFcn = destroyFcn;
      this.m_registers[type1][type2].primary = true;
      if (type1 != type2) {
        this.m_registers[type2][type1].createFcn = createFcn;
        this.m_registers[type2][type1].destroyFcn = destroyFcn;
        this.m_registers[type2][type1].primary = false;
      }
    };
    b2ContactFactory.prototype.InitializeRegisters = function () {
      this.m_registers = new Vector(b2Shape.e_shapeTypeCount);
      for (var i = 0; i < b2Shape.e_shapeTypeCount; i++) {
        this.m_registers[i] = new Vector(b2Shape.e_shapeTypeCount);
        for (var j = 0; j < b2Shape.e_shapeTypeCount; j++) {
          this.m_registers[i][j] = new b2ContactRegister();
        }
      }
      this.AddType(
        b2CircleContact.Create,
        b2CircleContact.Destroy,
        b2Shape.e_circleShape,
        b2Shape.e_circleShape
      );
      this.AddType(
        b2PolyAndCircleContact.Create,
        b2PolyAndCircleContact.Destroy,
        b2Shape.e_polygonShape,
        b2Shape.e_circleShape
      );
      this.AddType(
        b2PolygonContact.Create,
        b2PolygonContact.Destroy,
        b2Shape.e_polygonShape,
        b2Shape.e_polygonShape
      );
      this.AddType(
        b2EdgeAndCircleContact.Create,
        b2EdgeAndCircleContact.Destroy,
        b2Shape.e_edgeShape,
        b2Shape.e_circleShape
      );
      this.AddType(
        b2PolyAndEdgeContact.Create,
        b2PolyAndEdgeContact.Destroy,
        b2Shape.e_polygonShape,
        b2Shape.e_edgeShape
      );
    };
    b2ContactFactory.prototype.Create = function (fixtureA, fixtureB) {
      var type1 = parseInt(fixtureA.GetType());
      var type2 = parseInt(fixtureB.GetType());
      var reg = this.m_registers[type1][type2];
      var c;
      if (reg.pool) {
        c = reg.pool;
        reg.pool = c.m_next;
        reg.poolCount--;
        c.Reset(fixtureA, fixtureB);
        return c;
      }
      var createFcn = reg.createFcn;
      if (createFcn != null) {
        if (reg.primary) {
          c = createFcn(this.m_allocator);
          c.Reset(fixtureA, fixtureB);
          return c;
        } else {
          c = createFcn(this.m_allocator);
          c.Reset(fixtureB, fixtureA);
          return c;
        }
      } else {
        return null;
      }
    };
    b2ContactFactory.prototype.Destroy = function (contact) {
      if (contact.m_manifold.m_pointCount > 0) {
        contact.m_fixtureA.m_body.SetAwake(true);
        contact.m_fixtureB.m_body.SetAwake(true);
      }
      var type1 = parseInt(contact.m_fixtureA.GetType());
      var type2 = parseInt(contact.m_fixtureB.GetType());
      var reg = this.m_registers[type1][type2];
      if (true) {
        reg.poolCount++;
        contact.m_next = reg.pool;
        reg.pool = contact;
      }
      var destroyFcn = reg.destroyFcn;
      destroyFcn(contact, this.m_allocator);
    };
    b2ContactRegister.b2ContactRegister = function () {};
    b2ContactResult.b2ContactResult = function () {
      this.position = new b2Vec2();
      this.normal = new b2Vec2();
      this.id = new b2ContactID();
    };
    b2ContactSolver.b2ContactSolver = function () {
      this.m_step = new b2TimeStep();
      this.m_constraints = new Vector();
    };
    b2ContactSolver.prototype.b2ContactSolver = function () {};
    b2ContactSolver.prototype.Initialize = function (
      step,
      contacts,
      contactCount,
      allocator
    ) {
      if (contactCount === undefined) contactCount = 0;
      var contact;
      this.m_step.Set(step);
      this.m_allocator = allocator;
      var i = 0;
      var tVec;
      var tMat;
      this.m_constraintCount = contactCount;
      while (this.m_constraints.length < this.m_constraintCount) {
        this.m_constraints[this.m_constraints.length] =
          new b2ContactConstraint();
      }
      for (i = 0; i < contactCount; ++i) {
        contact = contacts[i];
        var fixtureA = contact.m_fixtureA;
        var fixtureB = contact.m_fixtureB;
        var shapeA = fixtureA.m_shape;
        var shapeB = fixtureB.m_shape;
        var radiusA = shapeA.m_radius;
        var radiusB = shapeB.m_radius;
        var bodyA = fixtureA.m_body;
        var bodyB = fixtureB.m_body;
        var manifold = contact.GetManifold();
        var friction = b2Settings.b2MixFriction(
          fixtureA.GetFriction(),
          fixtureB.GetFriction()
        );
        var restitution = b2Settings.b2MixRestitution(
          fixtureA.GetRestitution(),
          fixtureB.GetRestitution()
        );
        var vAX = bodyA.m_linearVelocity.x;
        var vAY = bodyA.m_linearVelocity.y;
        var vBX = bodyB.m_linearVelocity.x;
        var vBY = bodyB.m_linearVelocity.y;
        var wA = bodyA.m_angularVelocity;
        var wB = bodyB.m_angularVelocity;
        b2Settings.b2Assert(manifold.m_pointCount > 0);
        b2ContactSolver.s_worldManifold.Initialize(
          manifold,
          bodyA.m_xf,
          radiusA,
          bodyB.m_xf,
          radiusB
        );
        var normalX = b2ContactSolver.s_worldManifold.m_normal.x;
        var normalY = b2ContactSolver.s_worldManifold.m_normal.y;
        var cc = this.m_constraints[i];
        cc.bodyA = bodyA;
        cc.bodyB = bodyB;
        cc.manifold = manifold;
        cc.normal.x = normalX;
        cc.normal.y = normalY;
        cc.pointCount = manifold.m_pointCount;
        cc.friction = friction;
        cc.restitution = restitution;
        cc.localPlaneNormal.x = manifold.m_localPlaneNormal.x;
        cc.localPlaneNormal.y = manifold.m_localPlaneNormal.y;
        cc.localPoint.x = manifold.m_localPoint.x;
        cc.localPoint.y = manifold.m_localPoint.y;
        cc.radius = radiusA + radiusB;
        cc.type = manifold.m_type;
        for (var k = 0; k < cc.pointCount; ++k) {
          var cp = manifold.m_points[k];
          var ccp = cc.points[k];
          ccp.normalImpulse = cp.m_normalImpulse;
          ccp.tangentImpulse = cp.m_tangentImpulse;
          ccp.localPoint.SetV(cp.m_localPoint);
          var rAX = (ccp.rA.x =
            b2ContactSolver.s_worldManifold.m_points[k].x - bodyA.m_sweep.c.x);
          var rAY = (ccp.rA.y =
            b2ContactSolver.s_worldManifold.m_points[k].y - bodyA.m_sweep.c.y);
          var rBX = (ccp.rB.x =
            b2ContactSolver.s_worldManifold.m_points[k].x - bodyB.m_sweep.c.x);
          var rBY = (ccp.rB.y =
            b2ContactSolver.s_worldManifold.m_points[k].y - bodyB.m_sweep.c.y);
          var rnA = rAX * normalY - rAY * normalX;
          var rnB = rBX * normalY - rBY * normalX;
          rnA *= rnA;
          rnB *= rnB;
          var kNormal =
            bodyA.m_invMass +
            bodyB.m_invMass +
            bodyA.m_invI * rnA +
            bodyB.m_invI * rnB;
          ccp.normalMass = 1.0 / kNormal;
          var kEqualized =
            bodyA.m_mass * bodyA.m_invMass + bodyB.m_mass * bodyB.m_invMass;
          kEqualized +=
            bodyA.m_mass * bodyA.m_invI * rnA +
            bodyB.m_mass * bodyB.m_invI * rnB;
          ccp.equalizedMass = 1.0 / kEqualized;
          var tangentX = normalY;
          var tangentY = -normalX;
          var rtA = rAX * tangentY - rAY * tangentX;
          var rtB = rBX * tangentY - rBY * tangentX;
          rtA *= rtA;
          rtB *= rtB;
          var kTangent =
            bodyA.m_invMass +
            bodyB.m_invMass +
            bodyA.m_invI * rtA +
            bodyB.m_invI * rtB;
          ccp.tangentMass = 1.0 / kTangent;
          ccp.velocityBias = 0.0;
          var tX = vBX + -wB * rBY - vAX - -wA * rAY;
          var tY = vBY + wB * rBX - vAY - wA * rAX;
          var vRel = cc.normal.x * tX + cc.normal.y * tY;
          if (vRel < -b2Settings.b2_velocityThreshold) {
            ccp.velocityBias += -cc.restitution * vRel;
          }
        }
        if (cc.pointCount == 2) {
          var ccp1 = cc.points[0];
          var ccp2 = cc.points[1];
          var invMassA = bodyA.m_invMass;
          var invIA = bodyA.m_invI;
          var invMassB = bodyB.m_invMass;
          var invIB = bodyB.m_invI;
          var rn1A = ccp1.rA.x * normalY - ccp1.rA.y * normalX;
          var rn1B = ccp1.rB.x * normalY - ccp1.rB.y * normalX;
          var rn2A = ccp2.rA.x * normalY - ccp2.rA.y * normalX;
          var rn2B = ccp2.rB.x * normalY - ccp2.rB.y * normalX;
          var k11 =
            invMassA + invMassB + invIA * rn1A * rn1A + invIB * rn1B * rn1B;
          var k22 =
            invMassA + invMassB + invIA * rn2A * rn2A + invIB * rn2B * rn2B;
          var k12 =
            invMassA + invMassB + invIA * rn1A * rn2A + invIB * rn1B * rn2B;
          var k_maxConditionNumber = 100.0;
          if (k11 * k11 < k_maxConditionNumber * (k11 * k22 - k12 * k12)) {
            cc.K.col1.Set(k11, k12);
            cc.K.col2.Set(k12, k22);
            cc.K.GetInverse(cc.normalMass);
          } else {
            cc.pointCount = 1;
          }
        }
      }
    };
    b2ContactSolver.prototype.InitVelocityConstraints = function (step) {
      var tVec;
      var tVec2;
      var tMat;
      for (var i = 0; i < this.m_constraintCount; ++i) {
        var c = this.m_constraints[i];
        var bodyA = c.bodyA;
        var bodyB = c.bodyB;
        var invMassA = bodyA.m_invMass;
        var invIA = bodyA.m_invI;
        var invMassB = bodyB.m_invMass;
        var invIB = bodyB.m_invI;
        var normalX = c.normal.x;
        var normalY = c.normal.y;
        var tangentX = normalY;
        var tangentY = -normalX;
        var tX = 0;
        var j = 0;
        var tCount = 0;
        if (step.warmStarting) {
          tCount = c.pointCount;
          for (j = 0; j < tCount; ++j) {
            var ccp = c.points[j];
            ccp.normalImpulse *= step.dtRatio;
            ccp.tangentImpulse *= step.dtRatio;
            var PX =
              ccp.normalImpulse * normalX + ccp.tangentImpulse * tangentX;
            var PY =
              ccp.normalImpulse * normalY + ccp.tangentImpulse * tangentY;
            bodyA.m_angularVelocity -= invIA * (ccp.rA.x * PY - ccp.rA.y * PX);
            bodyA.m_linearVelocity.x -= invMassA * PX;
            bodyA.m_linearVelocity.y -= invMassA * PY;
            bodyB.m_angularVelocity += invIB * (ccp.rB.x * PY - ccp.rB.y * PX);
            bodyB.m_linearVelocity.x += invMassB * PX;
            bodyB.m_linearVelocity.y += invMassB * PY;
          }
        } else {
          tCount = c.pointCount;
          for (j = 0; j < tCount; ++j) {
            var ccp2 = c.points[j];
            ccp2.normalImpulse = 0.0;
            ccp2.tangentImpulse = 0.0;
          }
        }
      }
    };
    b2ContactSolver.prototype.SolveVelocityConstraints = function () {
      var j = 0;
      var ccp;
      var rAX = 0;
      var rAY = 0;
      var rBX = 0;
      var rBY = 0;
      var dvX = 0;
      var dvY = 0;
      var vn = 0;
      var vt = 0;
      var lambda = 0;
      var maxFriction = 0;
      var newImpulse = 0;
      var PX = 0;
      var PY = 0;
      var dX = 0;
      var dY = 0;
      var P1X = 0;
      var P1Y = 0;
      var P2X = 0;
      var P2Y = 0;
      var tMat;
      var tVec;
      for (var i = 0; i < this.m_constraintCount; ++i) {
        var c = this.m_constraints[i];
        var bodyA = c.bodyA;
        var bodyB = c.bodyB;
        var wA = bodyA.m_angularVelocity;
        var wB = bodyB.m_angularVelocity;
        var vA = bodyA.m_linearVelocity;
        var vB = bodyB.m_linearVelocity;
        var invMassA = bodyA.m_invMass;
        var invIA = bodyA.m_invI;
        var invMassB = bodyB.m_invMass;
        var invIB = bodyB.m_invI;
        var normalX = c.normal.x;
        var normalY = c.normal.y;
        var tangentX = normalY;
        var tangentY = -normalX;
        var friction = c.friction;
        var tX = 0;
        for (j = 0; j < c.pointCount; j++) {
          ccp = c.points[j];
          dvX = vB.x - wB * ccp.rB.y - vA.x + wA * ccp.rA.y;
          dvY = vB.y + wB * ccp.rB.x - vA.y - wA * ccp.rA.x;
          vt = dvX * tangentX + dvY * tangentY;
          lambda = ccp.tangentMass * -vt;
          maxFriction = friction * ccp.normalImpulse;
          newImpulse = b2Math.Clamp(
            ccp.tangentImpulse + lambda,
            -maxFriction,
            maxFriction
          );
          lambda = newImpulse - ccp.tangentImpulse;
          PX = lambda * tangentX;
          PY = lambda * tangentY;
          vA.x -= invMassA * PX;
          vA.y -= invMassA * PY;
          wA -= invIA * (ccp.rA.x * PY - ccp.rA.y * PX);
          vB.x += invMassB * PX;
          vB.y += invMassB * PY;
          wB += invIB * (ccp.rB.x * PY - ccp.rB.y * PX);
          ccp.tangentImpulse = newImpulse;
        }
        var tCount = parseInt(c.pointCount);
        if (c.pointCount == 1) {
          ccp = c.points[0];
          dvX = vB.x + -wB * ccp.rB.y - vA.x - -wA * ccp.rA.y;
          dvY = vB.y + wB * ccp.rB.x - vA.y - wA * ccp.rA.x;
          vn = dvX * normalX + dvY * normalY;
          lambda = -ccp.normalMass * (vn - ccp.velocityBias);
          newImpulse = ccp.normalImpulse + lambda;
          newImpulse = newImpulse > 0 ? newImpulse : 0.0;
          lambda = newImpulse - ccp.normalImpulse;
          PX = lambda * normalX;
          PY = lambda * normalY;
          vA.x -= invMassA * PX;
          vA.y -= invMassA * PY;
          wA -= invIA * (ccp.rA.x * PY - ccp.rA.y * PX);
          vB.x += invMassB * PX;
          vB.y += invMassB * PY;
          wB += invIB * (ccp.rB.x * PY - ccp.rB.y * PX);
          ccp.normalImpulse = newImpulse;
        } else {
          var cp1 = c.points[0];
          var cp2 = c.points[1];
          var aX = cp1.normalImpulse;
          var aY = cp2.normalImpulse;
          var dv1X = vB.x - wB * cp1.rB.y - vA.x + wA * cp1.rA.y;
          var dv1Y = vB.y + wB * cp1.rB.x - vA.y - wA * cp1.rA.x;
          var dv2X = vB.x - wB * cp2.rB.y - vA.x + wA * cp2.rA.y;
          var dv2Y = vB.y + wB * cp2.rB.x - vA.y - wA * cp2.rA.x;
          var vn1 = dv1X * normalX + dv1Y * normalY;
          var vn2 = dv2X * normalX + dv2Y * normalY;
          var bX = vn1 - cp1.velocityBias;
          var bY = vn2 - cp2.velocityBias;
          tMat = c.K;
          bX -= tMat.col1.x * aX + tMat.col2.x * aY;
          bY -= tMat.col1.y * aX + tMat.col2.y * aY;
          var k_errorTol = 0.001;
          for (;;) {
            tMat = c.normalMass;
            var xX = -(tMat.col1.x * bX + tMat.col2.x * bY);
            var xY = -(tMat.col1.y * bX + tMat.col2.y * bY);
            if (xX >= 0.0 && xY >= 0.0) {
              dX = xX - aX;
              dY = xY - aY;
              P1X = dX * normalX;
              P1Y = dX * normalY;
              P2X = dY * normalX;
              P2Y = dY * normalY;
              vA.x -= invMassA * (P1X + P2X);
              vA.y -= invMassA * (P1Y + P2Y);
              wA -=
                invIA *
                (cp1.rA.x * P1Y -
                  cp1.rA.y * P1X +
                  cp2.rA.x * P2Y -
                  cp2.rA.y * P2X);
              vB.x += invMassB * (P1X + P2X);
              vB.y += invMassB * (P1Y + P2Y);
              wB +=
                invIB *
                (cp1.rB.x * P1Y -
                  cp1.rB.y * P1X +
                  cp2.rB.x * P2Y -
                  cp2.rB.y * P2X);
              cp1.normalImpulse = xX;
              cp2.normalImpulse = xY;
              break;
            }
            xX = -cp1.normalMass * bX;
            xY = 0.0;
            vn1 = 0.0;
            vn2 = c.K.col1.y * xX + bY;
            if (xX >= 0.0 && vn2 >= 0.0) {
              dX = xX - aX;
              dY = xY - aY;
              P1X = dX * normalX;
              P1Y = dX * normalY;
              P2X = dY * normalX;
              P2Y = dY * normalY;
              vA.x -= invMassA * (P1X + P2X);
              vA.y -= invMassA * (P1Y + P2Y);
              wA -=
                invIA *
                (cp1.rA.x * P1Y -
                  cp1.rA.y * P1X +
                  cp2.rA.x * P2Y -
                  cp2.rA.y * P2X);
              vB.x += invMassB * (P1X + P2X);
              vB.y += invMassB * (P1Y + P2Y);
              wB +=
                invIB *
                (cp1.rB.x * P1Y -
                  cp1.rB.y * P1X +
                  cp2.rB.x * P2Y -
                  cp2.rB.y * P2X);
              cp1.normalImpulse = xX;
              cp2.normalImpulse = xY;
              break;
            }
            xX = 0.0;
            xY = -cp2.normalMass * bY;
            vn1 = c.K.col2.x * xY + bX;
            vn2 = 0.0;
            if (xY >= 0.0 && vn1 >= 0.0) {
              dX = xX - aX;
              dY = xY - aY;
              P1X = dX * normalX;
              P1Y = dX * normalY;
              P2X = dY * normalX;
              P2Y = dY * normalY;
              vA.x -= invMassA * (P1X + P2X);
              vA.y -= invMassA * (P1Y + P2Y);
              wA -=
                invIA *
                (cp1.rA.x * P1Y -
                  cp1.rA.y * P1X +
                  cp2.rA.x * P2Y -
                  cp2.rA.y * P2X);
              vB.x += invMassB * (P1X + P2X);
              vB.y += invMassB * (P1Y + P2Y);
              wB +=
                invIB *
                (cp1.rB.x * P1Y -
                  cp1.rB.y * P1X +
                  cp2.rB.x * P2Y -
                  cp2.rB.y * P2X);
              cp1.normalImpulse = xX;
              cp2.normalImpulse = xY;
              break;
            }
            xX = 0.0;
            xY = 0.0;
            vn1 = bX;
            vn2 = bY;
            if (vn1 >= 0.0 && vn2 >= 0.0) {
              dX = xX - aX;
              dY = xY - aY;
              P1X = dX * normalX;
              P1Y = dX * normalY;
              P2X = dY * normalX;
              P2Y = dY * normalY;
              vA.x -= invMassA * (P1X + P2X);
              vA.y -= invMassA * (P1Y + P2Y);
              wA -=
                invIA *
                (cp1.rA.x * P1Y -
                  cp1.rA.y * P1X +
                  cp2.rA.x * P2Y -
                  cp2.rA.y * P2X);
              vB.x += invMassB * (P1X + P2X);
              vB.y += invMassB * (P1Y + P2Y);
              wB +=
                invIB *
                (cp1.rB.x * P1Y -
                  cp1.rB.y * P1X +
                  cp2.rB.x * P2Y -
                  cp2.rB.y * P2X);
              cp1.normalImpulse = xX;
              cp2.normalImpulse = xY;
              break;
            }
            break;
          }
        }
        bodyA.m_angularVelocity = wA;
        bodyB.m_angularVelocity = wB;
      }
    };
    b2ContactSolver.prototype.FinalizeVelocityConstraints = function () {
      for (var i = 0; i < this.m_constraintCount; ++i) {
        var c = this.m_constraints[i];
        var m = c.manifold;
        for (var j = 0; j < c.pointCount; ++j) {
          var point1 = m.m_points[j];
          var point2 = c.points[j];
          point1.m_normalImpulse = point2.normalImpulse;
          point1.m_tangentImpulse = point2.tangentImpulse;
        }
      }
    };
    b2ContactSolver.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      var minSeparation = 0.0;
      for (var i = 0; i < this.m_constraintCount; i++) {
        var c = this.m_constraints[i];
        var bodyA = c.bodyA;
        var bodyB = c.bodyB;
        var invMassA = bodyA.m_mass * bodyA.m_invMass;
        var invIA = bodyA.m_mass * bodyA.m_invI;
        var invMassB = bodyB.m_mass * bodyB.m_invMass;
        var invIB = bodyB.m_mass * bodyB.m_invI;
        b2ContactSolver.s_psm.Initialize(c);
        var normal = b2ContactSolver.s_psm.m_normal;
        for (var j = 0; j < c.pointCount; j++) {
          var ccp = c.points[j];
          var point = b2ContactSolver.s_psm.m_points[j];
          var separation = b2ContactSolver.s_psm.m_separations[j];
          var rAX = point.x - bodyA.m_sweep.c.x;
          var rAY = point.y - bodyA.m_sweep.c.y;
          var rBX = point.x - bodyB.m_sweep.c.x;
          var rBY = point.y - bodyB.m_sweep.c.y;
          minSeparation =
            minSeparation < separation ? minSeparation : separation;
          var C = b2Math.Clamp(
            baumgarte * (separation + b2Settings.b2_linearSlop),
            -b2Settings.b2_maxLinearCorrection,
            0.0
          );
          var impulse = -ccp.equalizedMass * C;
          var PX = impulse * normal.x;
          var PY = impulse * normal.y;
          bodyA.m_sweep.c.x -= invMassA * PX;
          bodyA.m_sweep.c.y -= invMassA * PY;
          bodyA.m_sweep.a -= invIA * (rAX * PY - rAY * PX);
          bodyA.SynchronizeTransform();
          bodyB.m_sweep.c.x += invMassB * PX;
          bodyB.m_sweep.c.y += invMassB * PY;
          bodyB.m_sweep.a += invIB * (rBX * PY - rBY * PX);
          bodyB.SynchronizeTransform();
        }
      }
      return minSeparation > -1.5 * b2Settings.b2_linearSlop;
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.Contacts.b2ContactSolver.s_worldManifold =
        new b2WorldManifold();
      Box2D.Dynamics.Contacts.b2ContactSolver.s_psm =
        new b2PositionSolverManifold();
    });
    Box2D.inherit(b2EdgeAndCircleContact, Box2D.Dynamics.Contacts.b2Contact);
    b2EdgeAndCircleContact.prototype.__super =
      Box2D.Dynamics.Contacts.b2Contact.prototype;
    b2EdgeAndCircleContact.b2EdgeAndCircleContact = function () {
      Box2D.Dynamics.Contacts.b2Contact.b2Contact.apply(this, arguments);
    };
    b2EdgeAndCircleContact.Create = function (allocator) {
      return new b2EdgeAndCircleContact();
    };
    b2EdgeAndCircleContact.Destroy = function (contact, allocator) {};
    b2EdgeAndCircleContact.prototype.Reset = function (fixtureA, fixtureB) {
      this.__super.Reset.call(this, fixtureA, fixtureB);
    };
    b2EdgeAndCircleContact.prototype.Evaluate = function () {
      var bA = this.m_fixtureA.GetBody();
      var bB = this.m_fixtureB.GetBody();
      this.b2CollideEdgeAndCircle(
        this.m_manifold,
        this.m_fixtureA.GetShape() instanceof b2EdgeShape
          ? this.m_fixtureA.GetShape()
          : null,
        bA.m_xf,
        this.m_fixtureB.GetShape() instanceof b2CircleShape
          ? this.m_fixtureB.GetShape()
          : null,
        bB.m_xf
      );
    };
    b2EdgeAndCircleContact.prototype.b2CollideEdgeAndCircle = function (
      manifold,
      edge,
      xf1,
      circle,
      xf2
    ) {};
    Box2D.inherit(b2NullContact, Box2D.Dynamics.Contacts.b2Contact);
    b2NullContact.prototype.__super =
      Box2D.Dynamics.Contacts.b2Contact.prototype;
    b2NullContact.b2NullContact = function () {
      Box2D.Dynamics.Contacts.b2Contact.b2Contact.apply(this, arguments);
    };
    b2NullContact.prototype.b2NullContact = function () {
      this.__super.b2Contact.call(this);
    };
    b2NullContact.prototype.Evaluate = function () {};
    Box2D.inherit(b2PolyAndCircleContact, Box2D.Dynamics.Contacts.b2Contact);
    b2PolyAndCircleContact.prototype.__super =
      Box2D.Dynamics.Contacts.b2Contact.prototype;
    b2PolyAndCircleContact.b2PolyAndCircleContact = function () {
      Box2D.Dynamics.Contacts.b2Contact.b2Contact.apply(this, arguments);
    };
    b2PolyAndCircleContact.Create = function (allocator) {
      return new b2PolyAndCircleContact();
    };
    b2PolyAndCircleContact.Destroy = function (contact, allocator) {};
    b2PolyAndCircleContact.prototype.Reset = function (fixtureA, fixtureB) {
      this.__super.Reset.call(this, fixtureA, fixtureB);
      b2Settings.b2Assert(fixtureA.GetType() == b2Shape.e_polygonShape);
      b2Settings.b2Assert(fixtureB.GetType() == b2Shape.e_circleShape);
    };
    b2PolyAndCircleContact.prototype.Evaluate = function () {
      var bA = this.m_fixtureA.m_body;
      var bB = this.m_fixtureB.m_body;
      b2Collision.CollidePolygonAndCircle(
        this.m_manifold,
        this.m_fixtureA.GetShape() instanceof b2PolygonShape
          ? this.m_fixtureA.GetShape()
          : null,
        bA.m_xf,
        this.m_fixtureB.GetShape() instanceof b2CircleShape
          ? this.m_fixtureB.GetShape()
          : null,
        bB.m_xf
      );
    };
    Box2D.inherit(b2PolyAndEdgeContact, Box2D.Dynamics.Contacts.b2Contact);
    b2PolyAndEdgeContact.prototype.__super =
      Box2D.Dynamics.Contacts.b2Contact.prototype;
    b2PolyAndEdgeContact.b2PolyAndEdgeContact = function () {
      Box2D.Dynamics.Contacts.b2Contact.b2Contact.apply(this, arguments);
    };
    b2PolyAndEdgeContact.Create = function (allocator) {
      return new b2PolyAndEdgeContact();
    };
    b2PolyAndEdgeContact.Destroy = function (contact, allocator) {};
    b2PolyAndEdgeContact.prototype.Reset = function (fixtureA, fixtureB) {
      this.__super.Reset.call(this, fixtureA, fixtureB);
      b2Settings.b2Assert(fixtureA.GetType() == b2Shape.e_polygonShape);
      b2Settings.b2Assert(fixtureB.GetType() == b2Shape.e_edgeShape);
    };
    b2PolyAndEdgeContact.prototype.Evaluate = function () {
      var bA = this.m_fixtureA.GetBody();
      var bB = this.m_fixtureB.GetBody();
      this.b2CollidePolyAndEdge(
        this.m_manifold,
        this.m_fixtureA.GetShape() instanceof b2PolygonShape
          ? this.m_fixtureA.GetShape()
          : null,
        bA.m_xf,
        this.m_fixtureB.GetShape() instanceof b2EdgeShape
          ? this.m_fixtureB.GetShape()
          : null,
        bB.m_xf
      );
    };
    b2PolyAndEdgeContact.prototype.b2CollidePolyAndEdge = function (
      manifold,
      polygon,
      xf1,
      edge,
      xf2
    ) {};
    Box2D.inherit(b2PolygonContact, Box2D.Dynamics.Contacts.b2Contact);
    b2PolygonContact.prototype.__super =
      Box2D.Dynamics.Contacts.b2Contact.prototype;
    b2PolygonContact.b2PolygonContact = function () {
      Box2D.Dynamics.Contacts.b2Contact.b2Contact.apply(this, arguments);
    };
    b2PolygonContact.Create = function (allocator) {
      return new b2PolygonContact();
    };
    b2PolygonContact.Destroy = function (contact, allocator) {};
    b2PolygonContact.prototype.Reset = function (fixtureA, fixtureB) {
      this.__super.Reset.call(this, fixtureA, fixtureB);
    };
    b2PolygonContact.prototype.Evaluate = function () {
      var bA = this.m_fixtureA.GetBody();
      var bB = this.m_fixtureB.GetBody();
      b2Collision.CollidePolygons(
        this.m_manifold,
        this.m_fixtureA.GetShape() instanceof b2PolygonShape
          ? this.m_fixtureA.GetShape()
          : null,
        bA.m_xf,
        this.m_fixtureB.GetShape() instanceof b2PolygonShape
          ? this.m_fixtureB.GetShape()
          : null,
        bB.m_xf
      );
    };
    b2PositionSolverManifold.b2PositionSolverManifold = function () {};
    b2PositionSolverManifold.prototype.b2PositionSolverManifold = function () {
      this.m_normal = new b2Vec2();
      this.m_separations = new Vector_a2j_Number(
        b2Settings.b2_maxManifoldPoints
      );
      this.m_points = new Vector(b2Settings.b2_maxManifoldPoints);
      for (var i = 0; i < b2Settings.b2_maxManifoldPoints; i++) {
        this.m_points[i] = new b2Vec2();
      }
    };
    b2PositionSolverManifold.prototype.Initialize = function (cc) {
      b2Settings.b2Assert(cc.pointCount > 0);
      var i = 0;
      var clipPointX = 0;
      var clipPointY = 0;
      var tMat;
      var tVec;
      var planePointX = 0;
      var planePointY = 0;
      switch (cc.type) {
        case b2Manifold.e_circles:
          {
            tMat = cc.bodyA.m_xf.R;
            tVec = cc.localPoint;
            var pointAX =
              cc.bodyA.m_xf.position.x +
              (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
            var pointAY =
              cc.bodyA.m_xf.position.y +
              (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
            tMat = cc.bodyB.m_xf.R;
            tVec = cc.points[0].localPoint;
            var pointBX =
              cc.bodyB.m_xf.position.x +
              (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
            var pointBY =
              cc.bodyB.m_xf.position.y +
              (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
            var dX = pointBX - pointAX;
            var dY = pointBY - pointAY;
            var d2 = dX * dX + dY * dY;
            if (d2 > Number.MIN_VALUE * Number.MIN_VALUE) {
              var d = Math.sqrt(d2);
              this.m_normal.x = dX / d;
              this.m_normal.y = dY / d;
            } else {
              this.m_normal.x = 1.0;
              this.m_normal.y = 0.0;
            }
            this.m_points[0].x = 0.5 * (pointAX + pointBX);
            this.m_points[0].y = 0.5 * (pointAY + pointBY);
            this.m_separations[0] =
              dX * this.m_normal.x + dY * this.m_normal.y - cc.radius;
          }
          break;
        case b2Manifold.e_faceA:
          {
            tMat = cc.bodyA.m_xf.R;
            tVec = cc.localPlaneNormal;
            this.m_normal.x = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
            this.m_normal.y = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
            tMat = cc.bodyA.m_xf.R;
            tVec = cc.localPoint;
            planePointX =
              cc.bodyA.m_xf.position.x +
              (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
            planePointY =
              cc.bodyA.m_xf.position.y +
              (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
            tMat = cc.bodyB.m_xf.R;
            for (i = 0; i < cc.pointCount; ++i) {
              tVec = cc.points[i].localPoint;
              clipPointX =
                cc.bodyB.m_xf.position.x +
                (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
              clipPointY =
                cc.bodyB.m_xf.position.y +
                (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
              this.m_separations[i] =
                (clipPointX - planePointX) * this.m_normal.x +
                (clipPointY - planePointY) * this.m_normal.y -
                cc.radius;
              this.m_points[i].x = clipPointX;
              this.m_points[i].y = clipPointY;
            }
          }
          break;
        case b2Manifold.e_faceB:
          {
            tMat = cc.bodyB.m_xf.R;
            tVec = cc.localPlaneNormal;
            this.m_normal.x = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
            this.m_normal.y = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
            tMat = cc.bodyB.m_xf.R;
            tVec = cc.localPoint;
            planePointX =
              cc.bodyB.m_xf.position.x +
              (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
            planePointY =
              cc.bodyB.m_xf.position.y +
              (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
            tMat = cc.bodyA.m_xf.R;
            for (i = 0; i < cc.pointCount; ++i) {
              tVec = cc.points[i].localPoint;
              clipPointX =
                cc.bodyA.m_xf.position.x +
                (tMat.col1.x * tVec.x + tMat.col2.x * tVec.y);
              clipPointY =
                cc.bodyA.m_xf.position.y +
                (tMat.col1.y * tVec.x + tMat.col2.y * tVec.y);
              this.m_separations[i] =
                (clipPointX - planePointX) * this.m_normal.x +
                (clipPointY - planePointY) * this.m_normal.y -
                cc.radius;
              this.m_points[i].Set(clipPointX, clipPointY);
            }
            this.m_normal.x *= -1;
            this.m_normal.y *= -1;
          }
          break;
      }
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.Contacts.b2PositionSolverManifold.circlePointA =
        new b2Vec2();
      Box2D.Dynamics.Contacts.b2PositionSolverManifold.circlePointB =
        new b2Vec2();
    });
  })();
  (function () {
    var b2Body = Box2D.Dynamics.b2Body,
      b2BodyDef = Box2D.Dynamics.b2BodyDef,
      b2ContactFilter = Box2D.Dynamics.b2ContactFilter,
      b2ContactImpulse = Box2D.Dynamics.b2ContactImpulse,
      b2ContactListener = Box2D.Dynamics.b2ContactListener,
      b2ContactManager = Box2D.Dynamics.b2ContactManager,
      b2DebugDraw = Box2D.Dynamics.b2DebugDraw,
      b2DestructionListener = Box2D.Dynamics.b2DestructionListener,
      b2FilterData = Box2D.Dynamics.b2FilterData,
      b2Fixture = Box2D.Dynamics.b2Fixture,
      b2FixtureDef = Box2D.Dynamics.b2FixtureDef,
      b2Island = Box2D.Dynamics.b2Island,
      b2TimeStep = Box2D.Dynamics.b2TimeStep,
      b2World = Box2D.Dynamics.b2World,
      b2Mat22 = Box2D.Common.Math.b2Mat22,
      b2Mat33 = Box2D.Common.Math.b2Mat33,
      b2Math = Box2D.Common.Math.b2Math,
      b2Sweep = Box2D.Common.Math.b2Sweep,
      b2Transform = Box2D.Common.Math.b2Transform,
      b2Vec2 = Box2D.Common.Math.b2Vec2,
      b2Vec3 = Box2D.Common.Math.b2Vec3,
      b2Color = Box2D.Common.b2Color,
      b2internal = Box2D.Common.b2internal,
      b2Settings = Box2D.Common.b2Settings,
      b2CircleShape = Box2D.Collision.Shapes.b2CircleShape,
      b2EdgeChainDef = Box2D.Collision.Shapes.b2EdgeChainDef,
      b2EdgeShape = Box2D.Collision.Shapes.b2EdgeShape,
      b2MassData = Box2D.Collision.Shapes.b2MassData,
      b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape,
      b2Shape = Box2D.Collision.Shapes.b2Shape,
      b2BuoyancyController = Box2D.Dynamics.Controllers.b2BuoyancyController,
      b2ConstantAccelController =
        Box2D.Dynamics.Controllers.b2ConstantAccelController,
      b2ConstantForceController =
        Box2D.Dynamics.Controllers.b2ConstantForceController,
      b2Controller = Box2D.Dynamics.Controllers.b2Controller,
      b2ControllerEdge = Box2D.Dynamics.Controllers.b2ControllerEdge,
      b2GravityController = Box2D.Dynamics.Controllers.b2GravityController,
      b2TensorDampingController =
        Box2D.Dynamics.Controllers.b2TensorDampingController;

    Box2D.inherit(
      b2BuoyancyController,
      Box2D.Dynamics.Controllers.b2Controller
    );
    b2BuoyancyController.prototype.__super =
      Box2D.Dynamics.Controllers.b2Controller.prototype;
    b2BuoyancyController.b2BuoyancyController = function () {
      Box2D.Dynamics.Controllers.b2Controller.b2Controller.apply(
        this,
        arguments
      );
      this.normal = new b2Vec2(0, -1);
      this.offset = 0;
      this.density = 0;
      this.velocity = new b2Vec2(0, 0);
      this.linearDrag = 2;
      this.angularDrag = 1;
      this.useDensity = false;
      this.useWorldGravity = true;
      this.gravity = null;
    };
    b2BuoyancyController.prototype.Step = function (step) {
      if (!this.m_bodyList) return;
      if (this.useWorldGravity) {
        this.gravity = this.GetWorld().GetGravity().Copy();
      }
      for (var i = this.m_bodyList; i; i = i.nextBody) {
        var body = i.body;
        if (body.IsAwake() == false) {
          continue;
        }
        var areac = new b2Vec2();
        var massc = new b2Vec2();
        var area = 0.0;
        var mass = 0.0;
        for (
          var fixture = body.GetFixtureList();
          fixture;
          fixture = fixture.GetNext()
        ) {
          var sc = new b2Vec2();
          var sarea = fixture
            .GetShape()
            .ComputeSubmergedArea(
              this.normal,
              this.offset,
              body.GetTransform(),
              sc
            );
          area += sarea;
          areac.x += sarea * sc.x;
          areac.y += sarea * sc.y;
          var shapeDensity = 0;
          if (this.useDensity) {
            shapeDensity = 1;
          } else {
            shapeDensity = 1;
          }
          mass += sarea * shapeDensity;
          massc.x += sarea * sc.x * shapeDensity;
          massc.y += sarea * sc.y * shapeDensity;
        }
        areac.x /= area;
        areac.y /= area;
        massc.x /= mass;
        massc.y /= mass;
        if (area < Number.MIN_VALUE) continue;
        var buoyancyForce = this.gravity.GetNegative();
        buoyancyForce.Multiply(this.density * area);
        body.ApplyForce(buoyancyForce, massc);
        var dragForce = body.GetLinearVelocityFromWorldPoint(areac);
        dragForce.Subtract(this.velocity);
        dragForce.Multiply(-this.linearDrag * area);
        body.ApplyForce(dragForce, areac);
        body.ApplyTorque(
          (-body.GetInertia() / body.GetMass()) *
            area *
            body.GetAngularVelocity() *
            this.angularDrag
        );
      }
    };
    b2BuoyancyController.prototype.Draw = function (debugDraw) {
      var r = 1000;
      var p1 = new b2Vec2();
      var p2 = new b2Vec2();
      p1.x = this.normal.x * this.offset + this.normal.y * r;
      p1.y = this.normal.y * this.offset - this.normal.x * r;
      p2.x = this.normal.x * this.offset - this.normal.y * r;
      p2.y = this.normal.y * this.offset + this.normal.x * r;
      var color = new b2Color(0, 0, 1);
      debugDraw.DrawSegment(p1, p2, color);
    };
    Box2D.inherit(
      b2ConstantAccelController,
      Box2D.Dynamics.Controllers.b2Controller
    );
    b2ConstantAccelController.prototype.__super =
      Box2D.Dynamics.Controllers.b2Controller.prototype;
    b2ConstantAccelController.b2ConstantAccelController = function () {
      Box2D.Dynamics.Controllers.b2Controller.b2Controller.apply(
        this,
        arguments
      );
      this.A = new b2Vec2(0, 0);
    };
    b2ConstantAccelController.prototype.Step = function (step) {
      var smallA = new b2Vec2(this.A.x * step.dt, this.A.y * step.dt);
      for (var i = this.m_bodyList; i; i = i.nextBody) {
        var body = i.body;
        if (!body.IsAwake()) continue;
        body.SetLinearVelocity(
          new b2Vec2(
            body.GetLinearVelocity().x + smallA.x,
            body.GetLinearVelocity().y + smallA.y
          )
        );
      }
    };
    Box2D.inherit(
      b2ConstantForceController,
      Box2D.Dynamics.Controllers.b2Controller
    );
    b2ConstantForceController.prototype.__super =
      Box2D.Dynamics.Controllers.b2Controller.prototype;
    b2ConstantForceController.b2ConstantForceController = function () {
      Box2D.Dynamics.Controllers.b2Controller.b2Controller.apply(
        this,
        arguments
      );
      this.F = new b2Vec2(0, 0);
    };
    b2ConstantForceController.prototype.Step = function (step) {
      for (var i = this.m_bodyList; i; i = i.nextBody) {
        var body = i.body;
        if (!body.IsAwake()) continue;
        body.ApplyForce(this.F, body.GetWorldCenter());
      }
    };
    b2Controller.b2Controller = function () {};
    b2Controller.prototype.Step = function (step) {};
    b2Controller.prototype.Draw = function (debugDraw) {};
    b2Controller.prototype.AddBody = function (body) {
      var edge = new b2ControllerEdge();
      edge.controller = this;
      edge.body = body;
      edge.nextBody = this.m_bodyList;
      edge.prevBody = null;
      this.m_bodyList = edge;
      if (edge.nextBody) edge.nextBody.prevBody = edge;
      this.m_bodyCount++;
      edge.nextController = body.m_controllerList;
      edge.prevController = null;
      body.m_controllerList = edge;
      if (edge.nextController) edge.nextController.prevController = edge;
      body.m_controllerCount++;
    };
    b2Controller.prototype.RemoveBody = function (body) {
      var edge = body.m_controllerList;
      while (edge && edge.controller != this) edge = edge.nextController;
      if (edge.prevBody) edge.prevBody.nextBody = edge.nextBody;
      if (edge.nextBody) edge.nextBody.prevBody = edge.prevBody;
      if (edge.nextController)
        edge.nextController.prevController = edge.prevController;
      if (edge.prevController)
        edge.prevController.nextController = edge.nextController;
      if (this.m_bodyList == edge) this.m_bodyList = edge.nextBody;
      if (body.m_controllerList == edge)
        body.m_controllerList = edge.nextController;
      body.m_controllerCount--;
      this.m_bodyCount--;
    };
    b2Controller.prototype.Clear = function () {
      while (this.m_bodyList) this.RemoveBody(this.m_bodyList.body);
    };
    b2Controller.prototype.GetNext = function () {
      return this.m_next;
    };
    b2Controller.prototype.GetWorld = function () {
      return this.m_world;
    };
    b2Controller.prototype.GetBodyList = function () {
      return this.m_bodyList;
    };
    b2ControllerEdge.b2ControllerEdge = function () {};
    Box2D.inherit(b2GravityController, Box2D.Dynamics.Controllers.b2Controller);
    b2GravityController.prototype.__super =
      Box2D.Dynamics.Controllers.b2Controller.prototype;
    b2GravityController.b2GravityController = function () {
      Box2D.Dynamics.Controllers.b2Controller.b2Controller.apply(
        this,
        arguments
      );
      this.G = 1;
      this.invSqr = true;
    };
    b2GravityController.prototype.Step = function (step) {
      var i = null;
      var body1 = null;
      var p1 = null;
      var mass1 = 0;
      var j = null;
      var body2 = null;
      var p2 = null;
      var dx = 0;
      var dy = 0;
      var r2 = 0;
      var f = null;
      if (this.invSqr) {
        for (i = this.m_bodyList; i; i = i.nextBody) {
          body1 = i.body;
          p1 = body1.GetWorldCenter();
          mass1 = body1.GetMass();
          for (j = this.m_bodyList; j != i; j = j.nextBody) {
            body2 = j.body;
            p2 = body2.GetWorldCenter();
            dx = p2.x - p1.x;
            dy = p2.y - p1.y;
            r2 = dx * dx + dy * dy;
            if (r2 < Number.MIN_VALUE) continue;
            f = new b2Vec2(dx, dy);
            f.Multiply((this.G / r2 / Math.sqrt(r2)) * mass1 * body2.GetMass());
            if (body1.IsAwake()) body1.ApplyForce(f, p1);
            f.Multiply(-1);
            if (body2.IsAwake()) body2.ApplyForce(f, p2);
          }
        }
      } else {
        for (i = this.m_bodyList; i; i = i.nextBody) {
          body1 = i.body;
          p1 = body1.GetWorldCenter();
          mass1 = body1.GetMass();
          for (j = this.m_bodyList; j != i; j = j.nextBody) {
            body2 = j.body;
            p2 = body2.GetWorldCenter();
            dx = p2.x - p1.x;
            dy = p2.y - p1.y;
            r2 = dx * dx + dy * dy;
            if (r2 < Number.MIN_VALUE) continue;
            f = new b2Vec2(dx, dy);
            f.Multiply((this.G / r2) * mass1 * body2.GetMass());
            if (body1.IsAwake()) body1.ApplyForce(f, p1);
            f.Multiply(-1);
            if (body2.IsAwake()) body2.ApplyForce(f, p2);
          }
        }
      }
    };
    Box2D.inherit(
      b2TensorDampingController,
      Box2D.Dynamics.Controllers.b2Controller
    );
    b2TensorDampingController.prototype.__super =
      Box2D.Dynamics.Controllers.b2Controller.prototype;
    b2TensorDampingController.b2TensorDampingController = function () {
      Box2D.Dynamics.Controllers.b2Controller.b2Controller.apply(
        this,
        arguments
      );
      this.T = new b2Mat22();
      this.maxTimestep = 0;
    };
    b2TensorDampingController.prototype.SetAxisAligned = function (
      xDamping,
      yDamping
    ) {
      if (xDamping === undefined) xDamping = 0;
      if (yDamping === undefined) yDamping = 0;
      this.T.col1.x = -xDamping;
      this.T.col1.y = 0;
      this.T.col2.x = 0;
      this.T.col2.y = -yDamping;
      if (xDamping > 0 || yDamping > 0) {
        this.maxTimestep = 1 / Math.max(xDamping, yDamping);
      } else {
        this.maxTimestep = 0;
      }
    };
    b2TensorDampingController.prototype.Step = function (step) {
      var timestep = step.dt;
      if (timestep <= Number.MIN_VALUE) return;
      if (timestep > this.maxTimestep && this.maxTimestep > 0)
        timestep = this.maxTimestep;
      for (var i = this.m_bodyList; i; i = i.nextBody) {
        var body = i.body;
        if (!body.IsAwake()) {
          continue;
        }
        var damping = body.GetWorldVector(
          b2Math.MulMV(this.T, body.GetLocalVector(body.GetLinearVelocity()))
        );
        body.SetLinearVelocity(
          new b2Vec2(
            body.GetLinearVelocity().x + damping.x * timestep,
            body.GetLinearVelocity().y + damping.y * timestep
          )
        );
      }
    };
  })();
  (function () {
    var b2Color = Box2D.Common.b2Color,
      b2internal = Box2D.Common.b2internal,
      b2Settings = Box2D.Common.b2Settings,
      b2Mat22 = Box2D.Common.Math.b2Mat22,
      b2Mat33 = Box2D.Common.Math.b2Mat33,
      b2Math = Box2D.Common.Math.b2Math,
      b2Sweep = Box2D.Common.Math.b2Sweep,
      b2Transform = Box2D.Common.Math.b2Transform,
      b2Vec2 = Box2D.Common.Math.b2Vec2,
      b2Vec3 = Box2D.Common.Math.b2Vec3,
      b2DistanceJoint = Box2D.Dynamics.Joints.b2DistanceJoint,
      b2DistanceJointDef = Box2D.Dynamics.Joints.b2DistanceJointDef,
      b2FrictionJoint = Box2D.Dynamics.Joints.b2FrictionJoint,
      b2FrictionJointDef = Box2D.Dynamics.Joints.b2FrictionJointDef,
      b2GearJoint = Box2D.Dynamics.Joints.b2GearJoint,
      b2GearJointDef = Box2D.Dynamics.Joints.b2GearJointDef,
      b2Jacobian = Box2D.Dynamics.Joints.b2Jacobian,
      b2Joint = Box2D.Dynamics.Joints.b2Joint,
      b2JointDef = Box2D.Dynamics.Joints.b2JointDef,
      b2JointEdge = Box2D.Dynamics.Joints.b2JointEdge,
      b2LineJoint = Box2D.Dynamics.Joints.b2LineJoint,
      b2LineJointDef = Box2D.Dynamics.Joints.b2LineJointDef,
      b2MouseJoint = Box2D.Dynamics.Joints.b2MouseJoint,
      b2MouseJointDef = Box2D.Dynamics.Joints.b2MouseJointDef,
      b2PrismaticJoint = Box2D.Dynamics.Joints.b2PrismaticJoint,
      b2PrismaticJointDef = Box2D.Dynamics.Joints.b2PrismaticJointDef,
      b2PulleyJoint = Box2D.Dynamics.Joints.b2PulleyJoint,
      b2PulleyJointDef = Box2D.Dynamics.Joints.b2PulleyJointDef,
      b2RevoluteJoint = Box2D.Dynamics.Joints.b2RevoluteJoint,
      b2RevoluteJointDef = Box2D.Dynamics.Joints.b2RevoluteJointDef,
      b2WeldJoint = Box2D.Dynamics.Joints.b2WeldJoint,
      b2WeldJointDef = Box2D.Dynamics.Joints.b2WeldJointDef,
      b2Body = Box2D.Dynamics.b2Body,
      b2BodyDef = Box2D.Dynamics.b2BodyDef,
      b2ContactFilter = Box2D.Dynamics.b2ContactFilter,
      b2ContactImpulse = Box2D.Dynamics.b2ContactImpulse,
      b2ContactListener = Box2D.Dynamics.b2ContactListener,
      b2ContactManager = Box2D.Dynamics.b2ContactManager,
      b2DebugDraw = Box2D.Dynamics.b2DebugDraw,
      b2DestructionListener = Box2D.Dynamics.b2DestructionListener,
      b2FilterData = Box2D.Dynamics.b2FilterData,
      b2Fixture = Box2D.Dynamics.b2Fixture,
      b2FixtureDef = Box2D.Dynamics.b2FixtureDef,
      b2Island = Box2D.Dynamics.b2Island,
      b2TimeStep = Box2D.Dynamics.b2TimeStep,
      b2World = Box2D.Dynamics.b2World;

    Box2D.inherit(b2DistanceJoint, Box2D.Dynamics.Joints.b2Joint);
    b2DistanceJoint.prototype.__super = Box2D.Dynamics.Joints.b2Joint.prototype;
    b2DistanceJoint.b2DistanceJoint = function () {
      Box2D.Dynamics.Joints.b2Joint.b2Joint.apply(this, arguments);
      this.m_localAnchor1 = new b2Vec2();
      this.m_localAnchor2 = new b2Vec2();
      this.m_u = new b2Vec2();
    };
    b2DistanceJoint.prototype.GetAnchorA = function () {
      return this.m_bodyA.GetWorldPoint(this.m_localAnchor1);
    };
    b2DistanceJoint.prototype.GetAnchorB = function () {
      return this.m_bodyB.GetWorldPoint(this.m_localAnchor2);
    };
    b2DistanceJoint.prototype.GetReactionForce = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return new b2Vec2(
        inv_dt * this.m_impulse * this.m_u.x,
        inv_dt * this.m_impulse * this.m_u.y
      );
    };
    b2DistanceJoint.prototype.GetReactionTorque = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return 0.0;
    };
    b2DistanceJoint.prototype.GetLength = function () {
      return this.m_length;
    };
    b2DistanceJoint.prototype.SetLength = function (length) {
      if (length === undefined) length = 0;
      this.m_length = length;
    };
    b2DistanceJoint.prototype.GetFrequency = function () {
      return this.m_frequencyHz;
    };
    b2DistanceJoint.prototype.SetFrequency = function (hz) {
      if (hz === undefined) hz = 0;
      this.m_frequencyHz = hz;
    };
    b2DistanceJoint.prototype.GetDampingRatio = function () {
      return this.m_dampingRatio;
    };
    b2DistanceJoint.prototype.SetDampingRatio = function (ratio) {
      if (ratio === undefined) ratio = 0;
      this.m_dampingRatio = ratio;
    };
    b2DistanceJoint.prototype.b2DistanceJoint = function (def) {
      this.__super.b2Joint.call(this, def);
      var tMat;
      var tX = 0;
      var tY = 0;
      this.m_localAnchor1.SetV(def.localAnchorA);
      this.m_localAnchor2.SetV(def.localAnchorB);
      this.m_length = def.length;
      this.m_frequencyHz = def.frequencyHz;
      this.m_dampingRatio = def.dampingRatio;
      this.m_impulse = 0.0;
      this.m_gamma = 0.0;
      this.m_bias = 0.0;
    };
    b2DistanceJoint.prototype.InitVelocityConstraints = function (step) {
      var tMat;
      var tX = 0;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      tMat = bA.m_xf.R;
      var r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
      var r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
      tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = bB.m_xf.R;
      var r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
      var r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      this.m_u.x = bB.m_sweep.c.x + r2X - bA.m_sweep.c.x - r1X;
      this.m_u.y = bB.m_sweep.c.y + r2Y - bA.m_sweep.c.y - r1Y;
      var length = Math.sqrt(this.m_u.x * this.m_u.x + this.m_u.y * this.m_u.y);
      if (length > b2Settings.b2_linearSlop) {
        this.m_u.Multiply(1.0 / length);
      } else {
        this.m_u.SetZero();
      }
      var cr1u = r1X * this.m_u.y - r1Y * this.m_u.x;
      var cr2u = r2X * this.m_u.y - r2Y * this.m_u.x;
      var invMass =
        bA.m_invMass +
        bA.m_invI * cr1u * cr1u +
        bB.m_invMass +
        bB.m_invI * cr2u * cr2u;
      this.m_mass = invMass != 0.0 ? 1.0 / invMass : 0.0;
      if (this.m_frequencyHz > 0.0) {
        var C = length - this.m_length;
        var omega = 2.0 * Math.PI * this.m_frequencyHz;
        var d = 2.0 * this.m_mass * this.m_dampingRatio * omega;
        var k = this.m_mass * omega * omega;
        this.m_gamma = step.dt * (d + step.dt * k);
        this.m_gamma = this.m_gamma != 0.0 ? 1 / this.m_gamma : 0.0;
        this.m_bias = C * step.dt * k * this.m_gamma;
        this.m_mass = invMass + this.m_gamma;
        this.m_mass = this.m_mass != 0.0 ? 1.0 / this.m_mass : 0.0;
      }
      if (step.warmStarting) {
        this.m_impulse *= step.dtRatio;
        var PX = this.m_impulse * this.m_u.x;
        var PY = this.m_impulse * this.m_u.y;
        bA.m_linearVelocity.x -= bA.m_invMass * PX;
        bA.m_linearVelocity.y -= bA.m_invMass * PY;
        bA.m_angularVelocity -= bA.m_invI * (r1X * PY - r1Y * PX);
        bB.m_linearVelocity.x += bB.m_invMass * PX;
        bB.m_linearVelocity.y += bB.m_invMass * PY;
        bB.m_angularVelocity += bB.m_invI * (r2X * PY - r2Y * PX);
      } else {
        this.m_impulse = 0.0;
      }
    };
    b2DistanceJoint.prototype.SolveVelocityConstraints = function (step) {
      var tMat;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      tMat = bA.m_xf.R;
      var r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
      var r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
      var tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = bB.m_xf.R;
      var r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
      var r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var v1X = bA.m_linearVelocity.x + -bA.m_angularVelocity * r1Y;
      var v1Y = bA.m_linearVelocity.y + bA.m_angularVelocity * r1X;
      var v2X = bB.m_linearVelocity.x + -bB.m_angularVelocity * r2Y;
      var v2Y = bB.m_linearVelocity.y + bB.m_angularVelocity * r2X;
      var Cdot = this.m_u.x * (v2X - v1X) + this.m_u.y * (v2Y - v1Y);
      var impulse =
        -this.m_mass * (Cdot + this.m_bias + this.m_gamma * this.m_impulse);
      this.m_impulse += impulse;
      var PX = impulse * this.m_u.x;
      var PY = impulse * this.m_u.y;
      bA.m_linearVelocity.x -= bA.m_invMass * PX;
      bA.m_linearVelocity.y -= bA.m_invMass * PY;
      bA.m_angularVelocity -= bA.m_invI * (r1X * PY - r1Y * PX);
      bB.m_linearVelocity.x += bB.m_invMass * PX;
      bB.m_linearVelocity.y += bB.m_invMass * PY;
      bB.m_angularVelocity += bB.m_invI * (r2X * PY - r2Y * PX);
    };
    b2DistanceJoint.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      var tMat;
      if (this.m_frequencyHz > 0.0) {
        return true;
      }
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      tMat = bA.m_xf.R;
      var r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
      var r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
      var tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = bB.m_xf.R;
      var r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
      var r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var dX = bB.m_sweep.c.x + r2X - bA.m_sweep.c.x - r1X;
      var dY = bB.m_sweep.c.y + r2Y - bA.m_sweep.c.y - r1Y;
      var length = Math.sqrt(dX * dX + dY * dY);
      dX /= length;
      dY /= length;
      var C = length - this.m_length;
      C = b2Math.Clamp(
        C,
        -b2Settings.b2_maxLinearCorrection,
        b2Settings.b2_maxLinearCorrection
      );
      var impulse = -this.m_mass * C;
      this.m_u.Set(dX, dY);
      var PX = impulse * this.m_u.x;
      var PY = impulse * this.m_u.y;
      bA.m_sweep.c.x -= bA.m_invMass * PX;
      bA.m_sweep.c.y -= bA.m_invMass * PY;
      bA.m_sweep.a -= bA.m_invI * (r1X * PY - r1Y * PX);
      bB.m_sweep.c.x += bB.m_invMass * PX;
      bB.m_sweep.c.y += bB.m_invMass * PY;
      bB.m_sweep.a += bB.m_invI * (r2X * PY - r2Y * PX);
      bA.SynchronizeTransform();
      bB.SynchronizeTransform();
      return b2Math.Abs(C) < b2Settings.b2_linearSlop;
    };
    Box2D.inherit(b2DistanceJointDef, Box2D.Dynamics.Joints.b2JointDef);
    b2DistanceJointDef.prototype.__super =
      Box2D.Dynamics.Joints.b2JointDef.prototype;
    b2DistanceJointDef.b2DistanceJointDef = function () {
      Box2D.Dynamics.Joints.b2JointDef.b2JointDef.apply(this, arguments);
      this.localAnchorA = new b2Vec2();
      this.localAnchorB = new b2Vec2();
    };
    b2DistanceJointDef.prototype.b2DistanceJointDef = function () {
      this.__super.b2JointDef.call(this);
      this.type = b2Joint.e_distanceJoint;
      this.length = 1.0;
      this.frequencyHz = 0.0;
      this.dampingRatio = 0.0;
    };
    b2DistanceJointDef.prototype.Initialize = function (
      bA,
      bB,
      anchorA,
      anchorB
    ) {
      this.bodyA = bA;
      this.bodyB = bB;
      this.localAnchorA.SetV(this.bodyA.GetLocalPoint(anchorA));
      this.localAnchorB.SetV(this.bodyB.GetLocalPoint(anchorB));
      var dX = anchorB.x - anchorA.x;
      var dY = anchorB.y - anchorA.y;
      this.length = Math.sqrt(dX * dX + dY * dY);
      this.frequencyHz = 0.0;
      this.dampingRatio = 0.0;
    };
    Box2D.inherit(b2FrictionJoint, Box2D.Dynamics.Joints.b2Joint);
    b2FrictionJoint.prototype.__super = Box2D.Dynamics.Joints.b2Joint.prototype;
    b2FrictionJoint.b2FrictionJoint = function () {
      Box2D.Dynamics.Joints.b2Joint.b2Joint.apply(this, arguments);
      this.m_localAnchorA = new b2Vec2();
      this.m_localAnchorB = new b2Vec2();
      this.m_linearMass = new b2Mat22();
      this.m_linearImpulse = new b2Vec2();
    };
    b2FrictionJoint.prototype.GetAnchorA = function () {
      return this.m_bodyA.GetWorldPoint(this.m_localAnchorA);
    };
    b2FrictionJoint.prototype.GetAnchorB = function () {
      return this.m_bodyB.GetWorldPoint(this.m_localAnchorB);
    };
    b2FrictionJoint.prototype.GetReactionForce = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return new b2Vec2(
        inv_dt * this.m_linearImpulse.x,
        inv_dt * this.m_linearImpulse.y
      );
    };
    b2FrictionJoint.prototype.GetReactionTorque = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return inv_dt * this.m_angularImpulse;
    };
    b2FrictionJoint.prototype.SetMaxForce = function (force) {
      if (force === undefined) force = 0;
      this.m_maxForce = force;
    };
    b2FrictionJoint.prototype.GetMaxForce = function () {
      return this.m_maxForce;
    };
    b2FrictionJoint.prototype.SetMaxTorque = function (torque) {
      if (torque === undefined) torque = 0;
      this.m_maxTorque = torque;
    };
    b2FrictionJoint.prototype.GetMaxTorque = function () {
      return this.m_maxTorque;
    };
    b2FrictionJoint.prototype.b2FrictionJoint = function (def) {
      this.__super.b2Joint.call(this, def);
      this.m_localAnchorA.SetV(def.localAnchorA);
      this.m_localAnchorB.SetV(def.localAnchorB);
      this.m_linearMass.SetZero();
      this.m_angularMass = 0.0;
      this.m_linearImpulse.SetZero();
      this.m_angularImpulse = 0.0;
      this.m_maxForce = def.maxForce;
      this.m_maxTorque = def.maxTorque;
    };
    b2FrictionJoint.prototype.InitVelocityConstraints = function (step) {
      var tMat;
      var tX = 0;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      tMat = bA.m_xf.R;
      var rAX = this.m_localAnchorA.x - bA.m_sweep.localCenter.x;
      var rAY = this.m_localAnchorA.y - bA.m_sweep.localCenter.y;
      tX = tMat.col1.x * rAX + tMat.col2.x * rAY;
      rAY = tMat.col1.y * rAX + tMat.col2.y * rAY;
      rAX = tX;
      tMat = bB.m_xf.R;
      var rBX = this.m_localAnchorB.x - bB.m_sweep.localCenter.x;
      var rBY = this.m_localAnchorB.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * rBX + tMat.col2.x * rBY;
      rBY = tMat.col1.y * rBX + tMat.col2.y * rBY;
      rBX = tX;
      var mA = bA.m_invMass;
      var mB = bB.m_invMass;
      var iA = bA.m_invI;
      var iB = bB.m_invI;
      var K = new b2Mat22();
      K.col1.x = mA + mB;
      K.col2.x = 0.0;
      K.col1.y = 0.0;
      K.col2.y = mA + mB;
      K.col1.x += iA * rAY * rAY;
      K.col2.x += -iA * rAX * rAY;
      K.col1.y += -iA * rAX * rAY;
      K.col2.y += iA * rAX * rAX;
      K.col1.x += iB * rBY * rBY;
      K.col2.x += -iB * rBX * rBY;
      K.col1.y += -iB * rBX * rBY;
      K.col2.y += iB * rBX * rBX;
      K.GetInverse(this.m_linearMass);
      this.m_angularMass = iA + iB;
      if (this.m_angularMass > 0.0) {
        this.m_angularMass = 1.0 / this.m_angularMass;
      }
      if (step.warmStarting) {
        this.m_linearImpulse.x *= step.dtRatio;
        this.m_linearImpulse.y *= step.dtRatio;
        this.m_angularImpulse *= step.dtRatio;
        var P = this.m_linearImpulse;
        bA.m_linearVelocity.x -= mA * P.x;
        bA.m_linearVelocity.y -= mA * P.y;
        bA.m_angularVelocity -=
          iA * (rAX * P.y - rAY * P.x + this.m_angularImpulse);
        bB.m_linearVelocity.x += mB * P.x;
        bB.m_linearVelocity.y += mB * P.y;
        bB.m_angularVelocity +=
          iB * (rBX * P.y - rBY * P.x + this.m_angularImpulse);
      } else {
        this.m_linearImpulse.SetZero();
        this.m_angularImpulse = 0.0;
      }
    };
    b2FrictionJoint.prototype.SolveVelocityConstraints = function (step) {
      var tMat;
      var tX = 0;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var vA = bA.m_linearVelocity;
      var wA = bA.m_angularVelocity;
      var vB = bB.m_linearVelocity;
      var wB = bB.m_angularVelocity;
      var mA = bA.m_invMass;
      var mB = bB.m_invMass;
      var iA = bA.m_invI;
      var iB = bB.m_invI;
      tMat = bA.m_xf.R;
      var rAX = this.m_localAnchorA.x - bA.m_sweep.localCenter.x;
      var rAY = this.m_localAnchorA.y - bA.m_sweep.localCenter.y;
      tX = tMat.col1.x * rAX + tMat.col2.x * rAY;
      rAY = tMat.col1.y * rAX + tMat.col2.y * rAY;
      rAX = tX;
      tMat = bB.m_xf.R;
      var rBX = this.m_localAnchorB.x - bB.m_sweep.localCenter.x;
      var rBY = this.m_localAnchorB.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * rBX + tMat.col2.x * rBY;
      rBY = tMat.col1.y * rBX + tMat.col2.y * rBY;
      rBX = tX;
      var maxImpulse = 0;
      {
        var Cdot = wB - wA;
        var impulse = -this.m_angularMass * Cdot;
        var oldImpulse = this.m_angularImpulse;
        maxImpulse = step.dt * this.m_maxTorque;
        this.m_angularImpulse = b2Math.Clamp(
          this.m_angularImpulse + impulse,
          -maxImpulse,
          maxImpulse
        );
        impulse = this.m_angularImpulse - oldImpulse;
        wA -= iA * impulse;
        wB += iB * impulse;
      }
      {
        var CdotX = vB.x - wB * rBY - vA.x + wA * rAY;
        var CdotY = vB.y + wB * rBX - vA.y - wA * rAX;
        var impulseV = b2Math.MulMV(
          this.m_linearMass,
          new b2Vec2(-CdotX, -CdotY)
        );
        var oldImpulseV = this.m_linearImpulse.Copy();
        this.m_linearImpulse.Add(impulseV);
        maxImpulse = step.dt * this.m_maxForce;
        if (this.m_linearImpulse.LengthSquared() > maxImpulse * maxImpulse) {
          this.m_linearImpulse.Normalize();
          this.m_linearImpulse.Multiply(maxImpulse);
        }
        impulseV = b2Math.SubtractVV(this.m_linearImpulse, oldImpulseV);
        vA.x -= mA * impulseV.x;
        vA.y -= mA * impulseV.y;
        wA -= iA * (rAX * impulseV.y - rAY * impulseV.x);
        vB.x += mB * impulseV.x;
        vB.y += mB * impulseV.y;
        wB += iB * (rBX * impulseV.y - rBY * impulseV.x);
      }
      bA.m_angularVelocity = wA;
      bB.m_angularVelocity = wB;
    };
    b2FrictionJoint.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      return true;
    };
    Box2D.inherit(b2FrictionJointDef, Box2D.Dynamics.Joints.b2JointDef);
    b2FrictionJointDef.prototype.__super =
      Box2D.Dynamics.Joints.b2JointDef.prototype;
    b2FrictionJointDef.b2FrictionJointDef = function () {
      Box2D.Dynamics.Joints.b2JointDef.b2JointDef.apply(this, arguments);
      this.localAnchorA = new b2Vec2();
      this.localAnchorB = new b2Vec2();
    };
    b2FrictionJointDef.prototype.b2FrictionJointDef = function () {
      this.__super.b2JointDef.call(this);
      this.type = b2Joint.e_frictionJoint;
      this.maxForce = 0.0;
      this.maxTorque = 0.0;
    };
    b2FrictionJointDef.prototype.Initialize = function (bA, bB, anchor) {
      this.bodyA = bA;
      this.bodyB = bB;
      this.localAnchorA.SetV(this.bodyA.GetLocalPoint(anchor));
      this.localAnchorB.SetV(this.bodyB.GetLocalPoint(anchor));
    };
    Box2D.inherit(b2GearJoint, Box2D.Dynamics.Joints.b2Joint);
    b2GearJoint.prototype.__super = Box2D.Dynamics.Joints.b2Joint.prototype;
    b2GearJoint.b2GearJoint = function () {
      Box2D.Dynamics.Joints.b2Joint.b2Joint.apply(this, arguments);
      this.m_groundAnchor1 = new b2Vec2();
      this.m_groundAnchor2 = new b2Vec2();
      this.m_localAnchor1 = new b2Vec2();
      this.m_localAnchor2 = new b2Vec2();
      this.m_J = new b2Jacobian();
    };
    b2GearJoint.prototype.GetAnchorA = function () {
      return this.m_bodyA.GetWorldPoint(this.m_localAnchor1);
    };
    b2GearJoint.prototype.GetAnchorB = function () {
      return this.m_bodyB.GetWorldPoint(this.m_localAnchor2);
    };
    b2GearJoint.prototype.GetReactionForce = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return new b2Vec2(
        inv_dt * this.m_impulse * this.m_J.linearB.x,
        inv_dt * this.m_impulse * this.m_J.linearB.y
      );
    };
    b2GearJoint.prototype.GetReactionTorque = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      var tMat = this.m_bodyB.m_xf.R;
      var rX = this.m_localAnchor1.x - this.m_bodyB.m_sweep.localCenter.x;
      var rY = this.m_localAnchor1.y - this.m_bodyB.m_sweep.localCenter.y;
      var tX = tMat.col1.x * rX + tMat.col2.x * rY;
      rY = tMat.col1.y * rX + tMat.col2.y * rY;
      rX = tX;
      var PX = this.m_impulse * this.m_J.linearB.x;
      var PY = this.m_impulse * this.m_J.linearB.y;
      return inv_dt * (this.m_impulse * this.m_J.angularB - rX * PY + rY * PX);
    };
    b2GearJoint.prototype.GetRatio = function () {
      return this.m_ratio;
    };
    b2GearJoint.prototype.SetRatio = function (ratio) {
      if (ratio === undefined) ratio = 0;
      this.m_ratio = ratio;
    };
    b2GearJoint.prototype.b2GearJoint = function (def) {
      this.__super.b2Joint.call(this, def);
      var type1 = parseInt(def.joint1.m_type);
      var type2 = parseInt(def.joint2.m_type);
      this.m_revolute1 = null;
      this.m_prismatic1 = null;
      this.m_revolute2 = null;
      this.m_prismatic2 = null;
      var coordinate1 = 0;
      var coordinate2 = 0;
      this.m_ground1 = def.joint1.GetBodyA();
      this.m_bodyA = def.joint1.GetBodyB();
      if (type1 == b2Joint.e_revoluteJoint) {
        this.m_revolute1 =
          def.joint1 instanceof b2RevoluteJoint ? def.joint1 : null;
        this.m_groundAnchor1.SetV(this.m_revolute1.m_localAnchor1);
        this.m_localAnchor1.SetV(this.m_revolute1.m_localAnchor2);
        coordinate1 = this.m_revolute1.GetJointAngle();
      } else {
        this.m_prismatic1 =
          def.joint1 instanceof b2PrismaticJoint ? def.joint1 : null;
        this.m_groundAnchor1.SetV(this.m_prismatic1.m_localAnchor1);
        this.m_localAnchor1.SetV(this.m_prismatic1.m_localAnchor2);
        coordinate1 = this.m_prismatic1.GetJointTranslation();
      }
      this.m_ground2 = def.joint2.GetBodyA();
      this.m_bodyB = def.joint2.GetBodyB();
      if (type2 == b2Joint.e_revoluteJoint) {
        this.m_revolute2 =
          def.joint2 instanceof b2RevoluteJoint ? def.joint2 : null;
        this.m_groundAnchor2.SetV(this.m_revolute2.m_localAnchor1);
        this.m_localAnchor2.SetV(this.m_revolute2.m_localAnchor2);
        coordinate2 = this.m_revolute2.GetJointAngle();
      } else {
        this.m_prismatic2 =
          def.joint2 instanceof b2PrismaticJoint ? def.joint2 : null;
        this.m_groundAnchor2.SetV(this.m_prismatic2.m_localAnchor1);
        this.m_localAnchor2.SetV(this.m_prismatic2.m_localAnchor2);
        coordinate2 = this.m_prismatic2.GetJointTranslation();
      }
      this.m_ratio = def.ratio;
      this.m_constant = coordinate1 + this.m_ratio * coordinate2;
      this.m_impulse = 0.0;
    };
    b2GearJoint.prototype.InitVelocityConstraints = function (step) {
      var g1 = this.m_ground1;
      var g2 = this.m_ground2;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var ugX = 0;
      var ugY = 0;
      var rX = 0;
      var rY = 0;
      var tMat;
      var tVec;
      var crug = 0;
      var tX = 0;
      var K = 0.0;
      this.m_J.SetZero();
      if (this.m_revolute1) {
        this.m_J.angularA = -1.0;
        K += bA.m_invI;
      } else {
        tMat = g1.m_xf.R;
        tVec = this.m_prismatic1.m_localXAxis1;
        ugX = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
        ugY = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
        tMat = bA.m_xf.R;
        rX = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
        rY = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
        tX = tMat.col1.x * rX + tMat.col2.x * rY;
        rY = tMat.col1.y * rX + tMat.col2.y * rY;
        rX = tX;
        crug = rX * ugY - rY * ugX;
        this.m_J.linearA.Set(-ugX, -ugY);
        this.m_J.angularA = -crug;
        K += bA.m_invMass + bA.m_invI * crug * crug;
      }
      if (this.m_revolute2) {
        this.m_J.angularB = -this.m_ratio;
        K += this.m_ratio * this.m_ratio * bB.m_invI;
      } else {
        tMat = g2.m_xf.R;
        tVec = this.m_prismatic2.m_localXAxis1;
        ugX = tMat.col1.x * tVec.x + tMat.col2.x * tVec.y;
        ugY = tMat.col1.y * tVec.x + tMat.col2.y * tVec.y;
        tMat = bB.m_xf.R;
        rX = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
        rY = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
        tX = tMat.col1.x * rX + tMat.col2.x * rY;
        rY = tMat.col1.y * rX + tMat.col2.y * rY;
        rX = tX;
        crug = rX * ugY - rY * ugX;
        this.m_J.linearB.Set(-this.m_ratio * ugX, -this.m_ratio * ugY);
        this.m_J.angularB = -this.m_ratio * crug;
        K +=
          this.m_ratio *
          this.m_ratio *
          (bB.m_invMass + bB.m_invI * crug * crug);
      }
      this.m_mass = K > 0.0 ? 1.0 / K : 0.0;
      if (step.warmStarting) {
        bA.m_linearVelocity.x +=
          bA.m_invMass * this.m_impulse * this.m_J.linearA.x;
        bA.m_linearVelocity.y +=
          bA.m_invMass * this.m_impulse * this.m_J.linearA.y;
        bA.m_angularVelocity += bA.m_invI * this.m_impulse * this.m_J.angularA;
        bB.m_linearVelocity.x +=
          bB.m_invMass * this.m_impulse * this.m_J.linearB.x;
        bB.m_linearVelocity.y +=
          bB.m_invMass * this.m_impulse * this.m_J.linearB.y;
        bB.m_angularVelocity += bB.m_invI * this.m_impulse * this.m_J.angularB;
      } else {
        this.m_impulse = 0.0;
      }
    };
    b2GearJoint.prototype.SolveVelocityConstraints = function (step) {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var Cdot = this.m_J.Compute(
        bA.m_linearVelocity,
        bA.m_angularVelocity,
        bB.m_linearVelocity,
        bB.m_angularVelocity
      );
      var impulse = -this.m_mass * Cdot;
      this.m_impulse += impulse;
      bA.m_linearVelocity.x += bA.m_invMass * impulse * this.m_J.linearA.x;
      bA.m_linearVelocity.y += bA.m_invMass * impulse * this.m_J.linearA.y;
      bA.m_angularVelocity += bA.m_invI * impulse * this.m_J.angularA;
      bB.m_linearVelocity.x += bB.m_invMass * impulse * this.m_J.linearB.x;
      bB.m_linearVelocity.y += bB.m_invMass * impulse * this.m_J.linearB.y;
      bB.m_angularVelocity += bB.m_invI * impulse * this.m_J.angularB;
    };
    b2GearJoint.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      var linearError = 0.0;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var coordinate1 = 0;
      var coordinate2 = 0;
      if (this.m_revolute1) {
        coordinate1 = this.m_revolute1.GetJointAngle();
      } else {
        coordinate1 = this.m_prismatic1.GetJointTranslation();
      }
      if (this.m_revolute2) {
        coordinate2 = this.m_revolute2.GetJointAngle();
      } else {
        coordinate2 = this.m_prismatic2.GetJointTranslation();
      }
      var C = this.m_constant - (coordinate1 + this.m_ratio * coordinate2);
      var impulse = -this.m_mass * C;
      bA.m_sweep.c.x += bA.m_invMass * impulse * this.m_J.linearA.x;
      bA.m_sweep.c.y += bA.m_invMass * impulse * this.m_J.linearA.y;
      bA.m_sweep.a += bA.m_invI * impulse * this.m_J.angularA;
      bB.m_sweep.c.x += bB.m_invMass * impulse * this.m_J.linearB.x;
      bB.m_sweep.c.y += bB.m_invMass * impulse * this.m_J.linearB.y;
      bB.m_sweep.a += bB.m_invI * impulse * this.m_J.angularB;
      bA.SynchronizeTransform();
      bB.SynchronizeTransform();
      return linearError < b2Settings.b2_linearSlop;
    };
    Box2D.inherit(b2GearJointDef, Box2D.Dynamics.Joints.b2JointDef);
    b2GearJointDef.prototype.__super =
      Box2D.Dynamics.Joints.b2JointDef.prototype;
    b2GearJointDef.b2GearJointDef = function () {
      Box2D.Dynamics.Joints.b2JointDef.b2JointDef.apply(this, arguments);
    };
    b2GearJointDef.prototype.b2GearJointDef = function () {
      this.__super.b2JointDef.call(this);
      this.type = b2Joint.e_gearJoint;
      this.joint1 = null;
      this.joint2 = null;
      this.ratio = 1.0;
    };
    b2Jacobian.b2Jacobian = function () {
      this.linearA = new b2Vec2();
      this.linearB = new b2Vec2();
    };
    b2Jacobian.prototype.SetZero = function () {
      this.linearA.SetZero();
      this.angularA = 0.0;
      this.linearB.SetZero();
      this.angularB = 0.0;
    };
    b2Jacobian.prototype.Set = function (x1, a1, x2, a2) {
      if (a1 === undefined) a1 = 0;
      if (a2 === undefined) a2 = 0;
      this.linearA.SetV(x1);
      this.angularA = a1;
      this.linearB.SetV(x2);
      this.angularB = a2;
    };
    b2Jacobian.prototype.Compute = function (x1, a1, x2, a2) {
      if (a1 === undefined) a1 = 0;
      if (a2 === undefined) a2 = 0;
      return (
        this.linearA.x * x1.x +
        this.linearA.y * x1.y +
        this.angularA * a1 +
        (this.linearB.x * x2.x + this.linearB.y * x2.y) +
        this.angularB * a2
      );
    };
    b2Joint.b2Joint = function () {
      this.m_edgeA = new b2JointEdge();
      this.m_edgeB = new b2JointEdge();
      this.m_localCenterA = new b2Vec2();
      this.m_localCenterB = new b2Vec2();
    };
    b2Joint.prototype.GetType = function () {
      return this.m_type;
    };
    b2Joint.prototype.GetAnchorA = function () {
      return null;
    };
    b2Joint.prototype.GetAnchorB = function () {
      return null;
    };
    b2Joint.prototype.GetReactionForce = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return null;
    };
    b2Joint.prototype.GetReactionTorque = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return 0.0;
    };
    b2Joint.prototype.GetBodyA = function () {
      return this.m_bodyA;
    };
    b2Joint.prototype.GetBodyB = function () {
      return this.m_bodyB;
    };
    b2Joint.prototype.GetNext = function () {
      return this.m_next;
    };
    b2Joint.prototype.GetUserData = function () {
      return this.m_userData;
    };
    b2Joint.prototype.SetUserData = function (data) {
      this.m_userData = data;
    };
    b2Joint.prototype.IsActive = function () {
      return this.m_bodyA.IsActive() && this.m_bodyB.IsActive();
    };
    b2Joint.Create = function (def, allocator) {
      var joint = null;
      switch (def.type) {
        case b2Joint.e_distanceJoint:
          {
            joint = new b2DistanceJoint(
              def instanceof b2DistanceJointDef ? def : null
            );
          }
          break;
        case b2Joint.e_mouseJoint:
          {
            joint = new b2MouseJoint(
              def instanceof b2MouseJointDef ? def : null
            );
          }
          break;
        case b2Joint.e_prismaticJoint:
          {
            joint = new b2PrismaticJoint(
              def instanceof b2PrismaticJointDef ? def : null
            );
          }
          break;
        case b2Joint.e_revoluteJoint:
          {
            joint = new b2RevoluteJoint(
              def instanceof b2RevoluteJointDef ? def : null
            );
          }
          break;
        case b2Joint.e_pulleyJoint:
          {
            joint = new b2PulleyJoint(
              def instanceof b2PulleyJointDef ? def : null
            );
          }
          break;
        case b2Joint.e_gearJoint:
          {
            joint = new b2GearJoint(def instanceof b2GearJointDef ? def : null);
          }
          break;
        case b2Joint.e_lineJoint:
          {
            joint = new b2LineJoint(def instanceof b2LineJointDef ? def : null);
          }
          break;
        case b2Joint.e_weldJoint:
          {
            joint = new b2WeldJoint(def instanceof b2WeldJointDef ? def : null);
          }
          break;
        case b2Joint.e_frictionJoint:
          {
            joint = new b2FrictionJoint(
              def instanceof b2FrictionJointDef ? def : null
            );
          }
          break;
        default:
          break;
      }
      return joint;
    };
    b2Joint.Destroy = function (joint, allocator) {};
    b2Joint.prototype.b2Joint = function (def) {
      b2Settings.b2Assert(def.bodyA != def.bodyB);
      this.m_type = def.type;
      this.m_prev = null;
      this.m_next = null;
      this.m_bodyA = def.bodyA;
      this.m_bodyB = def.bodyB;
      this.m_collideConnected = def.collideConnected;
      this.m_islandFlag = false;
      this.m_userData = def.userData;
    };
    b2Joint.prototype.InitVelocityConstraints = function (step) {};
    b2Joint.prototype.SolveVelocityConstraints = function (step) {};
    b2Joint.prototype.FinalizeVelocityConstraints = function () {};
    b2Joint.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      return false;
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.Joints.b2Joint.e_unknownJoint = 0;
      Box2D.Dynamics.Joints.b2Joint.e_revoluteJoint = 1;
      Box2D.Dynamics.Joints.b2Joint.e_prismaticJoint = 2;
      Box2D.Dynamics.Joints.b2Joint.e_distanceJoint = 3;
      Box2D.Dynamics.Joints.b2Joint.e_pulleyJoint = 4;
      Box2D.Dynamics.Joints.b2Joint.e_mouseJoint = 5;
      Box2D.Dynamics.Joints.b2Joint.e_gearJoint = 6;
      Box2D.Dynamics.Joints.b2Joint.e_lineJoint = 7;
      Box2D.Dynamics.Joints.b2Joint.e_weldJoint = 8;
      Box2D.Dynamics.Joints.b2Joint.e_frictionJoint = 9;
      Box2D.Dynamics.Joints.b2Joint.e_inactiveLimit = 0;
      Box2D.Dynamics.Joints.b2Joint.e_atLowerLimit = 1;
      Box2D.Dynamics.Joints.b2Joint.e_atUpperLimit = 2;
      Box2D.Dynamics.Joints.b2Joint.e_equalLimits = 3;
    });
    b2JointDef.b2JointDef = function () {};
    b2JointDef.prototype.b2JointDef = function () {
      this.type = b2Joint.e_unknownJoint;
      this.userData = null;
      this.bodyA = null;
      this.bodyB = null;
      this.collideConnected = false;
    };
    b2JointEdge.b2JointEdge = function () {};
    Box2D.inherit(b2LineJoint, Box2D.Dynamics.Joints.b2Joint);
    b2LineJoint.prototype.__super = Box2D.Dynamics.Joints.b2Joint.prototype;
    b2LineJoint.b2LineJoint = function () {
      Box2D.Dynamics.Joints.b2Joint.b2Joint.apply(this, arguments);
      this.m_localAnchor1 = new b2Vec2();
      this.m_localAnchor2 = new b2Vec2();
      this.m_localXAxis1 = new b2Vec2();
      this.m_localYAxis1 = new b2Vec2();
      this.m_axis = new b2Vec2();
      this.m_perp = new b2Vec2();
      this.m_K = new b2Mat22();
      this.m_impulse = new b2Vec2();
    };
    b2LineJoint.prototype.GetAnchorA = function () {
      return this.m_bodyA.GetWorldPoint(this.m_localAnchor1);
    };
    b2LineJoint.prototype.GetAnchorB = function () {
      return this.m_bodyB.GetWorldPoint(this.m_localAnchor2);
    };
    b2LineJoint.prototype.GetReactionForce = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return new b2Vec2(
        inv_dt *
          (this.m_impulse.x * this.m_perp.x +
            (this.m_motorImpulse + this.m_impulse.y) * this.m_axis.x),
        inv_dt *
          (this.m_impulse.x * this.m_perp.y +
            (this.m_motorImpulse + this.m_impulse.y) * this.m_axis.y)
      );
    };
    b2LineJoint.prototype.GetReactionTorque = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return inv_dt * this.m_impulse.y;
    };
    b2LineJoint.prototype.GetJointTranslation = function () {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      var p1 = bA.GetWorldPoint(this.m_localAnchor1);
      var p2 = bB.GetWorldPoint(this.m_localAnchor2);
      var dX = p2.x - p1.x;
      var dY = p2.y - p1.y;
      var axis = bA.GetWorldVector(this.m_localXAxis1);
      var translation = axis.x * dX + axis.y * dY;
      return translation;
    };
    b2LineJoint.prototype.GetJointSpeed = function () {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      tMat = bA.m_xf.R;
      var r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
      var r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
      var tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = bB.m_xf.R;
      var r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
      var r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var p1X = bA.m_sweep.c.x + r1X;
      var p1Y = bA.m_sweep.c.y + r1Y;
      var p2X = bB.m_sweep.c.x + r2X;
      var p2Y = bB.m_sweep.c.y + r2Y;
      var dX = p2X - p1X;
      var dY = p2Y - p1Y;
      var axis = bA.GetWorldVector(this.m_localXAxis1);
      var v1 = bA.m_linearVelocity;
      var v2 = bB.m_linearVelocity;
      var w1 = bA.m_angularVelocity;
      var w2 = bB.m_angularVelocity;
      var speed =
        dX * (-w1 * axis.y) +
        dY * (w1 * axis.x) +
        (axis.x * (v2.x + -w2 * r2Y - v1.x - -w1 * r1Y) +
          axis.y * (v2.y + w2 * r2X - v1.y - w1 * r1X));
      return speed;
    };
    b2LineJoint.prototype.IsLimitEnabled = function () {
      return this.m_enableLimit;
    };
    b2LineJoint.prototype.EnableLimit = function (flag) {
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_enableLimit = flag;
    };
    b2LineJoint.prototype.GetLowerLimit = function () {
      return this.m_lowerTranslation;
    };
    b2LineJoint.prototype.GetUpperLimit = function () {
      return this.m_upperTranslation;
    };
    b2LineJoint.prototype.SetLimits = function (lower, upper) {
      if (lower === undefined) lower = 0;
      if (upper === undefined) upper = 0;
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_lowerTranslation = lower;
      this.m_upperTranslation = upper;
    };
    b2LineJoint.prototype.IsMotorEnabled = function () {
      return this.m_enableMotor;
    };
    b2LineJoint.prototype.EnableMotor = function (flag) {
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_enableMotor = flag;
    };
    b2LineJoint.prototype.SetMotorSpeed = function (speed) {
      if (speed === undefined) speed = 0;
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_motorSpeed = speed;
    };
    b2LineJoint.prototype.GetMotorSpeed = function () {
      return this.m_motorSpeed;
    };
    b2LineJoint.prototype.SetMaxMotorForce = function (force) {
      if (force === undefined) force = 0;
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_maxMotorForce = force;
    };
    b2LineJoint.prototype.GetMaxMotorForce = function () {
      return this.m_maxMotorForce;
    };
    b2LineJoint.prototype.GetMotorForce = function () {
      return this.m_motorImpulse;
    };
    b2LineJoint.prototype.b2LineJoint = function (def) {
      this.__super.b2Joint.call(this, def);
      var tMat;
      var tX = 0;
      var tY = 0;
      this.m_localAnchor1.SetV(def.localAnchorA);
      this.m_localAnchor2.SetV(def.localAnchorB);
      this.m_localXAxis1.SetV(def.localAxisA);
      this.m_localYAxis1.x = -this.m_localXAxis1.y;
      this.m_localYAxis1.y = this.m_localXAxis1.x;
      this.m_impulse.SetZero();
      this.m_motorMass = 0.0;
      this.m_motorImpulse = 0.0;
      this.m_lowerTranslation = def.lowerTranslation;
      this.m_upperTranslation = def.upperTranslation;
      this.m_maxMotorForce = def.maxMotorForce;
      this.m_motorSpeed = def.motorSpeed;
      this.m_enableLimit = def.enableLimit;
      this.m_enableMotor = def.enableMotor;
      this.m_limitState = b2Joint.e_inactiveLimit;
      this.m_axis.SetZero();
      this.m_perp.SetZero();
    };
    b2LineJoint.prototype.InitVelocityConstraints = function (step) {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      var tX = 0;
      this.m_localCenterA.SetV(bA.GetLocalCenter());
      this.m_localCenterB.SetV(bB.GetLocalCenter());
      var xf1 = bA.GetTransform();
      var xf2 = bB.GetTransform();
      tMat = bA.m_xf.R;
      var r1X = this.m_localAnchor1.x - this.m_localCenterA.x;
      var r1Y = this.m_localAnchor1.y - this.m_localCenterA.y;
      tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = bB.m_xf.R;
      var r2X = this.m_localAnchor2.x - this.m_localCenterB.x;
      var r2Y = this.m_localAnchor2.y - this.m_localCenterB.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var dX = bB.m_sweep.c.x + r2X - bA.m_sweep.c.x - r1X;
      var dY = bB.m_sweep.c.y + r2Y - bA.m_sweep.c.y - r1Y;
      this.m_invMassA = bA.m_invMass;
      this.m_invMassB = bB.m_invMass;
      this.m_invIA = bA.m_invI;
      this.m_invIB = bB.m_invI;
      {
        this.m_axis.SetV(b2Math.MulMV(xf1.R, this.m_localXAxis1));
        this.m_a1 = (dX + r1X) * this.m_axis.y - (dY + r1Y) * this.m_axis.x;
        this.m_a2 = r2X * this.m_axis.y - r2Y * this.m_axis.x;
        this.m_motorMass =
          this.m_invMassA +
          this.m_invMassB +
          this.m_invIA * this.m_a1 * this.m_a1 +
          this.m_invIB * this.m_a2 * this.m_a2;
        this.m_motorMass =
          this.m_motorMass > Number.MIN_VALUE ? 1.0 / this.m_motorMass : 0.0;
      }
      {
        this.m_perp.SetV(b2Math.MulMV(xf1.R, this.m_localYAxis1));
        this.m_s1 = (dX + r1X) * this.m_perp.y - (dY + r1Y) * this.m_perp.x;
        this.m_s2 = r2X * this.m_perp.y - r2Y * this.m_perp.x;
        var m1 = this.m_invMassA;
        var m2 = this.m_invMassB;
        var i1 = this.m_invIA;
        var i2 = this.m_invIB;
        this.m_K.col1.x =
          m1 + m2 + i1 * this.m_s1 * this.m_s1 + i2 * this.m_s2 * this.m_s2;
        this.m_K.col1.y =
          i1 * this.m_s1 * this.m_a1 + i2 * this.m_s2 * this.m_a2;
        this.m_K.col2.x = this.m_K.col1.y;
        this.m_K.col2.y =
          m1 + m2 + i1 * this.m_a1 * this.m_a1 + i2 * this.m_a2 * this.m_a2;
      }
      if (this.m_enableLimit) {
        var jointTransition = this.m_axis.x * dX + this.m_axis.y * dY;
        if (
          b2Math.Abs(this.m_upperTranslation - this.m_lowerTranslation) <
          2.0 * b2Settings.b2_linearSlop
        ) {
          this.m_limitState = b2Joint.e_equalLimits;
        } else if (jointTransition <= this.m_lowerTranslation) {
          if (this.m_limitState != b2Joint.e_atLowerLimit) {
            this.m_limitState = b2Joint.e_atLowerLimit;
            this.m_impulse.y = 0.0;
          }
        } else if (jointTransition >= this.m_upperTranslation) {
          if (this.m_limitState != b2Joint.e_atUpperLimit) {
            this.m_limitState = b2Joint.e_atUpperLimit;
            this.m_impulse.y = 0.0;
          }
        } else {
          this.m_limitState = b2Joint.e_inactiveLimit;
          this.m_impulse.y = 0.0;
        }
      } else {
        this.m_limitState = b2Joint.e_inactiveLimit;
      }
      if (this.m_enableMotor == false) {
        this.m_motorImpulse = 0.0;
      }
      if (step.warmStarting) {
        this.m_impulse.x *= step.dtRatio;
        this.m_impulse.y *= step.dtRatio;
        this.m_motorImpulse *= step.dtRatio;
        var PX =
          this.m_impulse.x * this.m_perp.x +
          (this.m_motorImpulse + this.m_impulse.y) * this.m_axis.x;
        var PY =
          this.m_impulse.x * this.m_perp.y +
          (this.m_motorImpulse + this.m_impulse.y) * this.m_axis.y;
        var L1 =
          this.m_impulse.x * this.m_s1 +
          (this.m_motorImpulse + this.m_impulse.y) * this.m_a1;
        var L2 =
          this.m_impulse.x * this.m_s2 +
          (this.m_motorImpulse + this.m_impulse.y) * this.m_a2;
        bA.m_linearVelocity.x -= this.m_invMassA * PX;
        bA.m_linearVelocity.y -= this.m_invMassA * PY;
        bA.m_angularVelocity -= this.m_invIA * L1;
        bB.m_linearVelocity.x += this.m_invMassB * PX;
        bB.m_linearVelocity.y += this.m_invMassB * PY;
        bB.m_angularVelocity += this.m_invIB * L2;
      } else {
        this.m_impulse.SetZero();
        this.m_motorImpulse = 0.0;
      }
    };
    b2LineJoint.prototype.SolveVelocityConstraints = function (step) {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var v1 = bA.m_linearVelocity;
      var w1 = bA.m_angularVelocity;
      var v2 = bB.m_linearVelocity;
      var w2 = bB.m_angularVelocity;
      var PX = 0;
      var PY = 0;
      var L1 = 0;
      var L2 = 0;
      if (this.m_enableMotor && this.m_limitState != b2Joint.e_equalLimits) {
        var Cdot =
          this.m_axis.x * (v2.x - v1.x) +
          this.m_axis.y * (v2.y - v1.y) +
          this.m_a2 * w2 -
          this.m_a1 * w1;
        var impulse = this.m_motorMass * (this.m_motorSpeed - Cdot);
        var oldImpulse = this.m_motorImpulse;
        var maxImpulse = step.dt * this.m_maxMotorForce;
        this.m_motorImpulse = b2Math.Clamp(
          this.m_motorImpulse + impulse,
          -maxImpulse,
          maxImpulse
        );
        impulse = this.m_motorImpulse - oldImpulse;
        PX = impulse * this.m_axis.x;
        PY = impulse * this.m_axis.y;
        L1 = impulse * this.m_a1;
        L2 = impulse * this.m_a2;
        v1.x -= this.m_invMassA * PX;
        v1.y -= this.m_invMassA * PY;
        w1 -= this.m_invIA * L1;
        v2.x += this.m_invMassB * PX;
        v2.y += this.m_invMassB * PY;
        w2 += this.m_invIB * L2;
      }
      var Cdot1 =
        this.m_perp.x * (v2.x - v1.x) +
        this.m_perp.y * (v2.y - v1.y) +
        this.m_s2 * w2 -
        this.m_s1 * w1;
      if (this.m_enableLimit && this.m_limitState != b2Joint.e_inactiveLimit) {
        var Cdot2 =
          this.m_axis.x * (v2.x - v1.x) +
          this.m_axis.y * (v2.y - v1.y) +
          this.m_a2 * w2 -
          this.m_a1 * w1;
        var f1 = this.m_impulse.Copy();
        var df = this.m_K.Solve(new b2Vec2(), -Cdot1, -Cdot2);
        this.m_impulse.Add(df);
        if (this.m_limitState == b2Joint.e_atLowerLimit) {
          this.m_impulse.y = b2Math.Max(this.m_impulse.y, 0.0);
        } else if (this.m_limitState == b2Joint.e_atUpperLimit) {
          this.m_impulse.y = b2Math.Min(this.m_impulse.y, 0.0);
        }
        var b = -Cdot1 - (this.m_impulse.y - f1.y) * this.m_K.col2.x;
        var f2r = 0;
        if (this.m_K.col1.x != 0.0) {
          f2r = b / this.m_K.col1.x + f1.x;
        } else {
          f2r = f1.x;
        }
        this.m_impulse.x = f2r;
        df.x = this.m_impulse.x - f1.x;
        df.y = this.m_impulse.y - f1.y;
        PX = df.x * this.m_perp.x + df.y * this.m_axis.x;
        PY = df.x * this.m_perp.y + df.y * this.m_axis.y;
        L1 = df.x * this.m_s1 + df.y * this.m_a1;
        L2 = df.x * this.m_s2 + df.y * this.m_a2;
        v1.x -= this.m_invMassA * PX;
        v1.y -= this.m_invMassA * PY;
        w1 -= this.m_invIA * L1;
        v2.x += this.m_invMassB * PX;
        v2.y += this.m_invMassB * PY;
        w2 += this.m_invIB * L2;
      } else {
        var df2 = 0;
        if (this.m_K.col1.x != 0.0) {
          df2 = -Cdot1 / this.m_K.col1.x;
        } else {
          df2 = 0.0;
        }
        this.m_impulse.x += df2;
        PX = df2 * this.m_perp.x;
        PY = df2 * this.m_perp.y;
        L1 = df2 * this.m_s1;
        L2 = df2 * this.m_s2;
        v1.x -= this.m_invMassA * PX;
        v1.y -= this.m_invMassA * PY;
        w1 -= this.m_invIA * L1;
        v2.x += this.m_invMassB * PX;
        v2.y += this.m_invMassB * PY;
        w2 += this.m_invIB * L2;
      }
      bA.m_linearVelocity.SetV(v1);
      bA.m_angularVelocity = w1;
      bB.m_linearVelocity.SetV(v2);
      bB.m_angularVelocity = w2;
    };
    b2LineJoint.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      var limitC = 0;
      var oldLimitImpulse = 0;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var c1 = bA.m_sweep.c;
      var a1 = bA.m_sweep.a;
      var c2 = bB.m_sweep.c;
      var a2 = bB.m_sweep.a;
      var tMat;
      var tX = 0;
      var m1 = 0;
      var m2 = 0;
      var i1 = 0;
      var i2 = 0;
      var linearError = 0.0;
      var angularError = 0.0;
      var active = false;
      var C2 = 0.0;
      var R1 = b2Mat22.FromAngle(a1);
      var R2 = b2Mat22.FromAngle(a2);
      tMat = R1;
      var r1X = this.m_localAnchor1.x - this.m_localCenterA.x;
      var r1Y = this.m_localAnchor1.y - this.m_localCenterA.y;
      tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = R2;
      var r2X = this.m_localAnchor2.x - this.m_localCenterB.x;
      var r2Y = this.m_localAnchor2.y - this.m_localCenterB.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var dX = c2.x + r2X - c1.x - r1X;
      var dY = c2.y + r2Y - c1.y - r1Y;
      if (this.m_enableLimit) {
        this.m_axis = b2Math.MulMV(R1, this.m_localXAxis1);
        this.m_a1 = (dX + r1X) * this.m_axis.y - (dY + r1Y) * this.m_axis.x;
        this.m_a2 = r2X * this.m_axis.y - r2Y * this.m_axis.x;
        var translation = this.m_axis.x * dX + this.m_axis.y * dY;
        if (
          b2Math.Abs(this.m_upperTranslation - this.m_lowerTranslation) <
          2.0 * b2Settings.b2_linearSlop
        ) {
          C2 = b2Math.Clamp(
            translation,
            -b2Settings.b2_maxLinearCorrection,
            b2Settings.b2_maxLinearCorrection
          );
          linearError = b2Math.Abs(translation);
          active = true;
        } else if (translation <= this.m_lowerTranslation) {
          C2 = b2Math.Clamp(
            translation - this.m_lowerTranslation + b2Settings.b2_linearSlop,
            -b2Settings.b2_maxLinearCorrection,
            0.0
          );
          linearError = this.m_lowerTranslation - translation;
          active = true;
        } else if (translation >= this.m_upperTranslation) {
          C2 = b2Math.Clamp(
            translation - this.m_upperTranslation + b2Settings.b2_linearSlop,
            0.0,
            b2Settings.b2_maxLinearCorrection
          );
          linearError = translation - this.m_upperTranslation;
          active = true;
        }
      }
      this.m_perp = b2Math.MulMV(R1, this.m_localYAxis1);
      this.m_s1 = (dX + r1X) * this.m_perp.y - (dY + r1Y) * this.m_perp.x;
      this.m_s2 = r2X * this.m_perp.y - r2Y * this.m_perp.x;
      var impulse = new b2Vec2();
      var C1 = this.m_perp.x * dX + this.m_perp.y * dY;
      linearError = b2Math.Max(linearError, b2Math.Abs(C1));
      angularError = 0.0;
      if (active) {
        m1 = this.m_invMassA;
        m2 = this.m_invMassB;
        i1 = this.m_invIA;
        i2 = this.m_invIB;
        this.m_K.col1.x =
          m1 + m2 + i1 * this.m_s1 * this.m_s1 + i2 * this.m_s2 * this.m_s2;
        this.m_K.col1.y =
          i1 * this.m_s1 * this.m_a1 + i2 * this.m_s2 * this.m_a2;
        this.m_K.col2.x = this.m_K.col1.y;
        this.m_K.col2.y =
          m1 + m2 + i1 * this.m_a1 * this.m_a1 + i2 * this.m_a2 * this.m_a2;
        this.m_K.Solve(impulse, -C1, -C2);
      } else {
        m1 = this.m_invMassA;
        m2 = this.m_invMassB;
        i1 = this.m_invIA;
        i2 = this.m_invIB;
        var k11 =
          m1 + m2 + i1 * this.m_s1 * this.m_s1 + i2 * this.m_s2 * this.m_s2;
        var impulse1 = 0;
        if (k11 != 0.0) {
          impulse1 = -C1 / k11;
        } else {
          impulse1 = 0.0;
        }
        impulse.x = impulse1;
        impulse.y = 0.0;
      }
      var PX = impulse.x * this.m_perp.x + impulse.y * this.m_axis.x;
      var PY = impulse.x * this.m_perp.y + impulse.y * this.m_axis.y;
      var L1 = impulse.x * this.m_s1 + impulse.y * this.m_a1;
      var L2 = impulse.x * this.m_s2 + impulse.y * this.m_a2;
      c1.x -= this.m_invMassA * PX;
      c1.y -= this.m_invMassA * PY;
      a1 -= this.m_invIA * L1;
      c2.x += this.m_invMassB * PX;
      c2.y += this.m_invMassB * PY;
      a2 += this.m_invIB * L2;
      bA.m_sweep.a = a1;
      bB.m_sweep.a = a2;
      bA.SynchronizeTransform();
      bB.SynchronizeTransform();
      return (
        linearError <= b2Settings.b2_linearSlop &&
        angularError <= b2Settings.b2_angularSlop
      );
    };
    Box2D.inherit(b2LineJointDef, Box2D.Dynamics.Joints.b2JointDef);
    b2LineJointDef.prototype.__super =
      Box2D.Dynamics.Joints.b2JointDef.prototype;
    b2LineJointDef.b2LineJointDef = function () {
      Box2D.Dynamics.Joints.b2JointDef.b2JointDef.apply(this, arguments);
      this.localAnchorA = new b2Vec2();
      this.localAnchorB = new b2Vec2();
      this.localAxisA = new b2Vec2();
    };
    b2LineJointDef.prototype.b2LineJointDef = function () {
      this.__super.b2JointDef.call(this);
      this.type = b2Joint.e_lineJoint;
      this.localAxisA.Set(1.0, 0.0);
      this.enableLimit = false;
      this.lowerTranslation = 0.0;
      this.upperTranslation = 0.0;
      this.enableMotor = false;
      this.maxMotorForce = 0.0;
      this.motorSpeed = 0.0;
    };
    b2LineJointDef.prototype.Initialize = function (bA, bB, anchor, axis) {
      this.bodyA = bA;
      this.bodyB = bB;
      this.localAnchorA = this.bodyA.GetLocalPoint(anchor);
      this.localAnchorB = this.bodyB.GetLocalPoint(anchor);
      this.localAxisA = this.bodyA.GetLocalVector(axis);
    };
    Box2D.inherit(b2MouseJoint, Box2D.Dynamics.Joints.b2Joint);
    b2MouseJoint.prototype.__super = Box2D.Dynamics.Joints.b2Joint.prototype;
    b2MouseJoint.b2MouseJoint = function () {
      Box2D.Dynamics.Joints.b2Joint.b2Joint.apply(this, arguments);
      this.K = new b2Mat22();
      this.K1 = new b2Mat22();
      this.K2 = new b2Mat22();
      this.m_localAnchor = new b2Vec2();
      this.m_target = new b2Vec2();
      this.m_impulse = new b2Vec2();
      this.m_mass = new b2Mat22();
      this.m_C = new b2Vec2();
    };
    b2MouseJoint.prototype.GetAnchorA = function () {
      return this.m_target;
    };
    b2MouseJoint.prototype.GetAnchorB = function () {
      return this.m_bodyB.GetWorldPoint(this.m_localAnchor);
    };
    b2MouseJoint.prototype.GetReactionForce = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return new b2Vec2(inv_dt * this.m_impulse.x, inv_dt * this.m_impulse.y);
    };
    b2MouseJoint.prototype.GetReactionTorque = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return 0.0;
    };
    b2MouseJoint.prototype.GetTarget = function () {
      return this.m_target;
    };
    b2MouseJoint.prototype.SetTarget = function (target) {
      if (this.m_bodyB.IsAwake() == false) {
        this.m_bodyB.SetAwake(true);
      }
      this.m_target = target;
    };
    b2MouseJoint.prototype.GetMaxForce = function () {
      return this.m_maxForce;
    };
    b2MouseJoint.prototype.SetMaxForce = function (maxForce) {
      if (maxForce === undefined) maxForce = 0;
      this.m_maxForce = maxForce;
    };
    b2MouseJoint.prototype.GetFrequency = function () {
      return this.m_frequencyHz;
    };
    b2MouseJoint.prototype.SetFrequency = function (hz) {
      if (hz === undefined) hz = 0;
      this.m_frequencyHz = hz;
    };
    b2MouseJoint.prototype.GetDampingRatio = function () {
      return this.m_dampingRatio;
    };
    b2MouseJoint.prototype.SetDampingRatio = function (ratio) {
      if (ratio === undefined) ratio = 0;
      this.m_dampingRatio = ratio;
    };
    b2MouseJoint.prototype.b2MouseJoint = function (def) {
      this.__super.b2Joint.call(this, def);
      this.m_target.SetV(def.target);
      var tX = this.m_target.x - this.m_bodyB.m_xf.position.x;
      var tY = this.m_target.y - this.m_bodyB.m_xf.position.y;
      var tMat = this.m_bodyB.m_xf.R;
      this.m_localAnchor.x = tX * tMat.col1.x + tY * tMat.col1.y;
      this.m_localAnchor.y = tX * tMat.col2.x + tY * tMat.col2.y;
      this.m_maxForce = def.maxForce;
      this.m_impulse.SetZero();
      this.m_frequencyHz = def.frequencyHz;
      this.m_dampingRatio = def.dampingRatio;
      this.m_beta = 0.0;
      this.m_gamma = 0.0;
    };
    b2MouseJoint.prototype.InitVelocityConstraints = function (step) {
      var b = this.m_bodyB;
      var mass = b.GetMass();
      var omega = 2.0 * Math.PI * this.m_frequencyHz;
      var d = 2.0 * mass * this.m_dampingRatio * omega;
      var k = mass * omega * omega;
      this.m_gamma = step.dt * (d + step.dt * k);
      this.m_gamma = this.m_gamma != 0 ? 1 / this.m_gamma : 0.0;
      this.m_beta = step.dt * k * this.m_gamma;
      var tMat;
      tMat = b.m_xf.R;
      var rX = this.m_localAnchor.x - b.m_sweep.localCenter.x;
      var rY = this.m_localAnchor.y - b.m_sweep.localCenter.y;
      var tX = tMat.col1.x * rX + tMat.col2.x * rY;
      rY = tMat.col1.y * rX + tMat.col2.y * rY;
      rX = tX;
      var invMass = b.m_invMass;
      var invI = b.m_invI;
      this.K1.col1.x = invMass;
      this.K1.col2.x = 0.0;
      this.K1.col1.y = 0.0;
      this.K1.col2.y = invMass;
      this.K2.col1.x = invI * rY * rY;
      this.K2.col2.x = -invI * rX * rY;
      this.K2.col1.y = -invI * rX * rY;
      this.K2.col2.y = invI * rX * rX;
      this.K.SetM(this.K1);
      this.K.AddM(this.K2);
      this.K.col1.x += this.m_gamma;
      this.K.col2.y += this.m_gamma;
      this.K.GetInverse(this.m_mass);
      this.m_C.x = b.m_sweep.c.x + rX - this.m_target.x;
      this.m_C.y = b.m_sweep.c.y + rY - this.m_target.y;
      b.m_angularVelocity *= 0.98;
      this.m_impulse.x *= step.dtRatio;
      this.m_impulse.y *= step.dtRatio;
      b.m_linearVelocity.x += invMass * this.m_impulse.x;
      b.m_linearVelocity.y += invMass * this.m_impulse.y;
      b.m_angularVelocity +=
        invI * (rX * this.m_impulse.y - rY * this.m_impulse.x);
    };
    b2MouseJoint.prototype.SolveVelocityConstraints = function (step) {
      var b = this.m_bodyB;
      var tMat;
      var tX = 0;
      var tY = 0;
      tMat = b.m_xf.R;
      var rX = this.m_localAnchor.x - b.m_sweep.localCenter.x;
      var rY = this.m_localAnchor.y - b.m_sweep.localCenter.y;
      tX = tMat.col1.x * rX + tMat.col2.x * rY;
      rY = tMat.col1.y * rX + tMat.col2.y * rY;
      rX = tX;
      var CdotX = b.m_linearVelocity.x + -b.m_angularVelocity * rY;
      var CdotY = b.m_linearVelocity.y + b.m_angularVelocity * rX;
      tMat = this.m_mass;
      tX = CdotX + this.m_beta * this.m_C.x + this.m_gamma * this.m_impulse.x;
      tY = CdotY + this.m_beta * this.m_C.y + this.m_gamma * this.m_impulse.y;
      var impulseX = -(tMat.col1.x * tX + tMat.col2.x * tY);
      var impulseY = -(tMat.col1.y * tX + tMat.col2.y * tY);
      var oldImpulseX = this.m_impulse.x;
      var oldImpulseY = this.m_impulse.y;
      this.m_impulse.x += impulseX;
      this.m_impulse.y += impulseY;
      var maxImpulse = step.dt * this.m_maxForce;
      if (this.m_impulse.LengthSquared() > maxImpulse * maxImpulse) {
        this.m_impulse.Multiply(maxImpulse / this.m_impulse.Length());
      }
      impulseX = this.m_impulse.x - oldImpulseX;
      impulseY = this.m_impulse.y - oldImpulseY;
      b.m_linearVelocity.x += b.m_invMass * impulseX;
      b.m_linearVelocity.y += b.m_invMass * impulseY;
      b.m_angularVelocity += b.m_invI * (rX * impulseY - rY * impulseX);
    };
    b2MouseJoint.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      return true;
    };
    Box2D.inherit(b2MouseJointDef, Box2D.Dynamics.Joints.b2JointDef);
    b2MouseJointDef.prototype.__super =
      Box2D.Dynamics.Joints.b2JointDef.prototype;
    b2MouseJointDef.b2MouseJointDef = function () {
      Box2D.Dynamics.Joints.b2JointDef.b2JointDef.apply(this, arguments);
      this.target = new b2Vec2();
    };
    b2MouseJointDef.prototype.b2MouseJointDef = function () {
      this.__super.b2JointDef.call(this);
      this.type = b2Joint.e_mouseJoint;
      this.maxForce = 0.0;
      this.frequencyHz = 5.0;
      this.dampingRatio = 0.7;
    };
    Box2D.inherit(b2PrismaticJoint, Box2D.Dynamics.Joints.b2Joint);
    b2PrismaticJoint.prototype.__super =
      Box2D.Dynamics.Joints.b2Joint.prototype;
    b2PrismaticJoint.b2PrismaticJoint = function () {
      Box2D.Dynamics.Joints.b2Joint.b2Joint.apply(this, arguments);
      this.m_localAnchor1 = new b2Vec2();
      this.m_localAnchor2 = new b2Vec2();
      this.m_localXAxis1 = new b2Vec2();
      this.m_localYAxis1 = new b2Vec2();
      this.m_axis = new b2Vec2();
      this.m_perp = new b2Vec2();
      this.m_K = new b2Mat33();
      this.m_impulse = new b2Vec3();
    };
    b2PrismaticJoint.prototype.GetAnchorA = function () {
      return this.m_bodyA.GetWorldPoint(this.m_localAnchor1);
    };
    b2PrismaticJoint.prototype.GetAnchorB = function () {
      return this.m_bodyB.GetWorldPoint(this.m_localAnchor2);
    };
    b2PrismaticJoint.prototype.GetReactionForce = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return new b2Vec2(
        inv_dt *
          (this.m_impulse.x * this.m_perp.x +
            (this.m_motorImpulse + this.m_impulse.z) * this.m_axis.x),
        inv_dt *
          (this.m_impulse.x * this.m_perp.y +
            (this.m_motorImpulse + this.m_impulse.z) * this.m_axis.y)
      );
    };
    b2PrismaticJoint.prototype.GetReactionTorque = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return inv_dt * this.m_impulse.y;
    };
    b2PrismaticJoint.prototype.GetJointTranslation = function () {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      var p1 = bA.GetWorldPoint(this.m_localAnchor1);
      var p2 = bB.GetWorldPoint(this.m_localAnchor2);
      var dX = p2.x - p1.x;
      var dY = p2.y - p1.y;
      var axis = bA.GetWorldVector(this.m_localXAxis1);
      var translation = axis.x * dX + axis.y * dY;
      return translation;
    };
    b2PrismaticJoint.prototype.GetJointSpeed = function () {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      tMat = bA.m_xf.R;
      var r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
      var r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
      var tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = bB.m_xf.R;
      var r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
      var r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var p1X = bA.m_sweep.c.x + r1X;
      var p1Y = bA.m_sweep.c.y + r1Y;
      var p2X = bB.m_sweep.c.x + r2X;
      var p2Y = bB.m_sweep.c.y + r2Y;
      var dX = p2X - p1X;
      var dY = p2Y - p1Y;
      var axis = bA.GetWorldVector(this.m_localXAxis1);
      var v1 = bA.m_linearVelocity;
      var v2 = bB.m_linearVelocity;
      var w1 = bA.m_angularVelocity;
      var w2 = bB.m_angularVelocity;
      var speed =
        dX * (-w1 * axis.y) +
        dY * (w1 * axis.x) +
        (axis.x * (v2.x + -w2 * r2Y - v1.x - -w1 * r1Y) +
          axis.y * (v2.y + w2 * r2X - v1.y - w1 * r1X));
      return speed;
    };
    b2PrismaticJoint.prototype.IsLimitEnabled = function () {
      return this.m_enableLimit;
    };
    b2PrismaticJoint.prototype.EnableLimit = function (flag) {
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_enableLimit = flag;
    };
    b2PrismaticJoint.prototype.GetLowerLimit = function () {
      return this.m_lowerTranslation;
    };
    b2PrismaticJoint.prototype.GetUpperLimit = function () {
      return this.m_upperTranslation;
    };
    b2PrismaticJoint.prototype.SetLimits = function (lower, upper) {
      if (lower === undefined) lower = 0;
      if (upper === undefined) upper = 0;
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_lowerTranslation = lower;
      this.m_upperTranslation = upper;
    };
    b2PrismaticJoint.prototype.IsMotorEnabled = function () {
      return this.m_enableMotor;
    };
    b2PrismaticJoint.prototype.EnableMotor = function (flag) {
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_enableMotor = flag;
    };
    b2PrismaticJoint.prototype.SetMotorSpeed = function (speed) {
      if (speed === undefined) speed = 0;
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_motorSpeed = speed;
    };
    b2PrismaticJoint.prototype.GetMotorSpeed = function () {
      return this.m_motorSpeed;
    };
    b2PrismaticJoint.prototype.SetMaxMotorForce = function (force) {
      if (force === undefined) force = 0;
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_maxMotorForce = force;
    };
    b2PrismaticJoint.prototype.GetMotorForce = function () {
      return this.m_motorImpulse;
    };
    b2PrismaticJoint.prototype.b2PrismaticJoint = function (def) {
      this.__super.b2Joint.call(this, def);
      var tMat;
      var tX = 0;
      var tY = 0;
      this.m_localAnchor1.SetV(def.localAnchorA);
      this.m_localAnchor2.SetV(def.localAnchorB);
      this.m_localXAxis1.SetV(def.localAxisA);
      this.m_localYAxis1.x = -this.m_localXAxis1.y;
      this.m_localYAxis1.y = this.m_localXAxis1.x;
      this.m_refAngle = def.referenceAngle;
      this.m_impulse.SetZero();
      this.m_motorMass = 0.0;
      this.m_motorImpulse = 0.0;
      this.m_lowerTranslation = def.lowerTranslation;
      this.m_upperTranslation = def.upperTranslation;
      this.m_maxMotorForce = def.maxMotorForce;
      this.m_motorSpeed = def.motorSpeed;
      this.m_enableLimit = def.enableLimit;
      this.m_enableMotor = def.enableMotor;
      this.m_limitState = b2Joint.e_inactiveLimit;
      this.m_axis.SetZero();
      this.m_perp.SetZero();
    };
    b2PrismaticJoint.prototype.InitVelocityConstraints = function (step) {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      var tX = 0;
      this.m_localCenterA.SetV(bA.GetLocalCenter());
      this.m_localCenterB.SetV(bB.GetLocalCenter());
      var xf1 = bA.GetTransform();
      var xf2 = bB.GetTransform();
      tMat = bA.m_xf.R;
      var r1X = this.m_localAnchor1.x - this.m_localCenterA.x;
      var r1Y = this.m_localAnchor1.y - this.m_localCenterA.y;
      tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = bB.m_xf.R;
      var r2X = this.m_localAnchor2.x - this.m_localCenterB.x;
      var r2Y = this.m_localAnchor2.y - this.m_localCenterB.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var dX = bB.m_sweep.c.x + r2X - bA.m_sweep.c.x - r1X;
      var dY = bB.m_sweep.c.y + r2Y - bA.m_sweep.c.y - r1Y;
      this.m_invMassA = bA.m_invMass;
      this.m_invMassB = bB.m_invMass;
      this.m_invIA = bA.m_invI;
      this.m_invIB = bB.m_invI;
      {
        this.m_axis.SetV(b2Math.MulMV(xf1.R, this.m_localXAxis1));
        this.m_a1 = (dX + r1X) * this.m_axis.y - (dY + r1Y) * this.m_axis.x;
        this.m_a2 = r2X * this.m_axis.y - r2Y * this.m_axis.x;
        this.m_motorMass =
          this.m_invMassA +
          this.m_invMassB +
          this.m_invIA * this.m_a1 * this.m_a1 +
          this.m_invIB * this.m_a2 * this.m_a2;
        if (this.m_motorMass > Number.MIN_VALUE)
          this.m_motorMass = 1.0 / this.m_motorMass;
      }
      {
        this.m_perp.SetV(b2Math.MulMV(xf1.R, this.m_localYAxis1));
        this.m_s1 = (dX + r1X) * this.m_perp.y - (dY + r1Y) * this.m_perp.x;
        this.m_s2 = r2X * this.m_perp.y - r2Y * this.m_perp.x;
        var m1 = this.m_invMassA;
        var m2 = this.m_invMassB;
        var i1 = this.m_invIA;
        var i2 = this.m_invIB;
        this.m_K.col1.x =
          m1 + m2 + i1 * this.m_s1 * this.m_s1 + i2 * this.m_s2 * this.m_s2;
        this.m_K.col1.y = i1 * this.m_s1 + i2 * this.m_s2;
        this.m_K.col1.z =
          i1 * this.m_s1 * this.m_a1 + i2 * this.m_s2 * this.m_a2;
        this.m_K.col2.x = this.m_K.col1.y;
        this.m_K.col2.y = i1 + i2;
        this.m_K.col2.z = i1 * this.m_a1 + i2 * this.m_a2;
        this.m_K.col3.x = this.m_K.col1.z;
        this.m_K.col3.y = this.m_K.col2.z;
        this.m_K.col3.z =
          m1 + m2 + i1 * this.m_a1 * this.m_a1 + i2 * this.m_a2 * this.m_a2;
      }
      if (this.m_enableLimit) {
        var jointTransition = this.m_axis.x * dX + this.m_axis.y * dY;
        if (
          b2Math.Abs(this.m_upperTranslation - this.m_lowerTranslation) <
          2.0 * b2Settings.b2_linearSlop
        ) {
          this.m_limitState = b2Joint.e_equalLimits;
        } else if (jointTransition <= this.m_lowerTranslation) {
          if (this.m_limitState != b2Joint.e_atLowerLimit) {
            this.m_limitState = b2Joint.e_atLowerLimit;
            this.m_impulse.z = 0.0;
          }
        } else if (jointTransition >= this.m_upperTranslation) {
          if (this.m_limitState != b2Joint.e_atUpperLimit) {
            this.m_limitState = b2Joint.e_atUpperLimit;
            this.m_impulse.z = 0.0;
          }
        } else {
          this.m_limitState = b2Joint.e_inactiveLimit;
          this.m_impulse.z = 0.0;
        }
      } else {
        this.m_limitState = b2Joint.e_inactiveLimit;
      }
      if (this.m_enableMotor == false) {
        this.m_motorImpulse = 0.0;
      }
      if (step.warmStarting) {
        this.m_impulse.x *= step.dtRatio;
        this.m_impulse.y *= step.dtRatio;
        this.m_motorImpulse *= step.dtRatio;
        var PX =
          this.m_impulse.x * this.m_perp.x +
          (this.m_motorImpulse + this.m_impulse.z) * this.m_axis.x;
        var PY =
          this.m_impulse.x * this.m_perp.y +
          (this.m_motorImpulse + this.m_impulse.z) * this.m_axis.y;
        var L1 =
          this.m_impulse.x * this.m_s1 +
          this.m_impulse.y +
          (this.m_motorImpulse + this.m_impulse.z) * this.m_a1;
        var L2 =
          this.m_impulse.x * this.m_s2 +
          this.m_impulse.y +
          (this.m_motorImpulse + this.m_impulse.z) * this.m_a2;
        bA.m_linearVelocity.x -= this.m_invMassA * PX;
        bA.m_linearVelocity.y -= this.m_invMassA * PY;
        bA.m_angularVelocity -= this.m_invIA * L1;
        bB.m_linearVelocity.x += this.m_invMassB * PX;
        bB.m_linearVelocity.y += this.m_invMassB * PY;
        bB.m_angularVelocity += this.m_invIB * L2;
      } else {
        this.m_impulse.SetZero();
        this.m_motorImpulse = 0.0;
      }
    };
    b2PrismaticJoint.prototype.SolveVelocityConstraints = function (step) {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var v1 = bA.m_linearVelocity;
      var w1 = bA.m_angularVelocity;
      var v2 = bB.m_linearVelocity;
      var w2 = bB.m_angularVelocity;
      var PX = 0;
      var PY = 0;
      var L1 = 0;
      var L2 = 0;
      if (this.m_enableMotor && this.m_limitState != b2Joint.e_equalLimits) {
        var Cdot =
          this.m_axis.x * (v2.x - v1.x) +
          this.m_axis.y * (v2.y - v1.y) +
          this.m_a2 * w2 -
          this.m_a1 * w1;
        var impulse = this.m_motorMass * (this.m_motorSpeed - Cdot);
        var oldImpulse = this.m_motorImpulse;
        var maxImpulse = step.dt * this.m_maxMotorForce;
        this.m_motorImpulse = b2Math.Clamp(
          this.m_motorImpulse + impulse,
          -maxImpulse,
          maxImpulse
        );
        impulse = this.m_motorImpulse - oldImpulse;
        PX = impulse * this.m_axis.x;
        PY = impulse * this.m_axis.y;
        L1 = impulse * this.m_a1;
        L2 = impulse * this.m_a2;
        v1.x -= this.m_invMassA * PX;
        v1.y -= this.m_invMassA * PY;
        w1 -= this.m_invIA * L1;
        v2.x += this.m_invMassB * PX;
        v2.y += this.m_invMassB * PY;
        w2 += this.m_invIB * L2;
      }
      var Cdot1X =
        this.m_perp.x * (v2.x - v1.x) +
        this.m_perp.y * (v2.y - v1.y) +
        this.m_s2 * w2 -
        this.m_s1 * w1;
      var Cdot1Y = w2 - w1;
      if (this.m_enableLimit && this.m_limitState != b2Joint.e_inactiveLimit) {
        var Cdot2 =
          this.m_axis.x * (v2.x - v1.x) +
          this.m_axis.y * (v2.y - v1.y) +
          this.m_a2 * w2 -
          this.m_a1 * w1;
        var f1 = this.m_impulse.Copy();
        var df = this.m_K.Solve33(new b2Vec3(), -Cdot1X, -Cdot1Y, -Cdot2);
        this.m_impulse.Add(df);
        if (this.m_limitState == b2Joint.e_atLowerLimit) {
          this.m_impulse.z = b2Math.Max(this.m_impulse.z, 0.0);
        } else if (this.m_limitState == b2Joint.e_atUpperLimit) {
          this.m_impulse.z = b2Math.Min(this.m_impulse.z, 0.0);
        }
        var bX = -Cdot1X - (this.m_impulse.z - f1.z) * this.m_K.col3.x;
        var bY = -Cdot1Y - (this.m_impulse.z - f1.z) * this.m_K.col3.y;
        var f2r = this.m_K.Solve22(new b2Vec2(), bX, bY);
        f2r.x += f1.x;
        f2r.y += f1.y;
        this.m_impulse.x = f2r.x;
        this.m_impulse.y = f2r.y;
        df.x = this.m_impulse.x - f1.x;
        df.y = this.m_impulse.y - f1.y;
        df.z = this.m_impulse.z - f1.z;
        PX = df.x * this.m_perp.x + df.z * this.m_axis.x;
        PY = df.x * this.m_perp.y + df.z * this.m_axis.y;
        L1 = df.x * this.m_s1 + df.y + df.z * this.m_a1;
        L2 = df.x * this.m_s2 + df.y + df.z * this.m_a2;
        v1.x -= this.m_invMassA * PX;
        v1.y -= this.m_invMassA * PY;
        w1 -= this.m_invIA * L1;
        v2.x += this.m_invMassB * PX;
        v2.y += this.m_invMassB * PY;
        w2 += this.m_invIB * L2;
      } else {
        var df2 = this.m_K.Solve22(new b2Vec2(), -Cdot1X, -Cdot1Y);
        this.m_impulse.x += df2.x;
        this.m_impulse.y += df2.y;
        PX = df2.x * this.m_perp.x;
        PY = df2.x * this.m_perp.y;
        L1 = df2.x * this.m_s1 + df2.y;
        L2 = df2.x * this.m_s2 + df2.y;
        v1.x -= this.m_invMassA * PX;
        v1.y -= this.m_invMassA * PY;
        w1 -= this.m_invIA * L1;
        v2.x += this.m_invMassB * PX;
        v2.y += this.m_invMassB * PY;
        w2 += this.m_invIB * L2;
      }
      bA.m_linearVelocity.SetV(v1);
      bA.m_angularVelocity = w1;
      bB.m_linearVelocity.SetV(v2);
      bB.m_angularVelocity = w2;
    };
    b2PrismaticJoint.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      var limitC = 0;
      var oldLimitImpulse = 0;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var c1 = bA.m_sweep.c;
      var a1 = bA.m_sweep.a;
      var c2 = bB.m_sweep.c;
      var a2 = bB.m_sweep.a;
      var tMat;
      var tX = 0;
      var m1 = 0;
      var m2 = 0;
      var i1 = 0;
      var i2 = 0;
      var linearError = 0.0;
      var angularError = 0.0;
      var active = false;
      var C2 = 0.0;
      var R1 = b2Mat22.FromAngle(a1);
      var R2 = b2Mat22.FromAngle(a2);
      tMat = R1;
      var r1X = this.m_localAnchor1.x - this.m_localCenterA.x;
      var r1Y = this.m_localAnchor1.y - this.m_localCenterA.y;
      tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = R2;
      var r2X = this.m_localAnchor2.x - this.m_localCenterB.x;
      var r2Y = this.m_localAnchor2.y - this.m_localCenterB.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var dX = c2.x + r2X - c1.x - r1X;
      var dY = c2.y + r2Y - c1.y - r1Y;
      if (this.m_enableLimit) {
        this.m_axis = b2Math.MulMV(R1, this.m_localXAxis1);
        this.m_a1 = (dX + r1X) * this.m_axis.y - (dY + r1Y) * this.m_axis.x;
        this.m_a2 = r2X * this.m_axis.y - r2Y * this.m_axis.x;
        var translation = this.m_axis.x * dX + this.m_axis.y * dY;
        if (
          b2Math.Abs(this.m_upperTranslation - this.m_lowerTranslation) <
          2.0 * b2Settings.b2_linearSlop
        ) {
          C2 = b2Math.Clamp(
            translation,
            -b2Settings.b2_maxLinearCorrection,
            b2Settings.b2_maxLinearCorrection
          );
          linearError = b2Math.Abs(translation);
          active = true;
        } else if (translation <= this.m_lowerTranslation) {
          C2 = b2Math.Clamp(
            translation - this.m_lowerTranslation + b2Settings.b2_linearSlop,
            -b2Settings.b2_maxLinearCorrection,
            0.0
          );
          linearError = this.m_lowerTranslation - translation;
          active = true;
        } else if (translation >= this.m_upperTranslation) {
          C2 = b2Math.Clamp(
            translation - this.m_upperTranslation + b2Settings.b2_linearSlop,
            0.0,
            b2Settings.b2_maxLinearCorrection
          );
          linearError = translation - this.m_upperTranslation;
          active = true;
        }
      }
      this.m_perp = b2Math.MulMV(R1, this.m_localYAxis1);
      this.m_s1 = (dX + r1X) * this.m_perp.y - (dY + r1Y) * this.m_perp.x;
      this.m_s2 = r2X * this.m_perp.y - r2Y * this.m_perp.x;
      var impulse = new b2Vec3();
      var C1X = this.m_perp.x * dX + this.m_perp.y * dY;
      var C1Y = a2 - a1 - this.m_refAngle;
      linearError = b2Math.Max(linearError, b2Math.Abs(C1X));
      angularError = b2Math.Abs(C1Y);
      if (active) {
        m1 = this.m_invMassA;
        m2 = this.m_invMassB;
        i1 = this.m_invIA;
        i2 = this.m_invIB;
        this.m_K.col1.x =
          m1 + m2 + i1 * this.m_s1 * this.m_s1 + i2 * this.m_s2 * this.m_s2;
        this.m_K.col1.y = i1 * this.m_s1 + i2 * this.m_s2;
        this.m_K.col1.z =
          i1 * this.m_s1 * this.m_a1 + i2 * this.m_s2 * this.m_a2;
        this.m_K.col2.x = this.m_K.col1.y;
        this.m_K.col2.y = i1 + i2;
        this.m_K.col2.z = i1 * this.m_a1 + i2 * this.m_a2;
        this.m_K.col3.x = this.m_K.col1.z;
        this.m_K.col3.y = this.m_K.col2.z;
        this.m_K.col3.z =
          m1 + m2 + i1 * this.m_a1 * this.m_a1 + i2 * this.m_a2 * this.m_a2;
        this.m_K.Solve33(impulse, -C1X, -C1Y, -C2);
      } else {
        m1 = this.m_invMassA;
        m2 = this.m_invMassB;
        i1 = this.m_invIA;
        i2 = this.m_invIB;
        var k11 =
          m1 + m2 + i1 * this.m_s1 * this.m_s1 + i2 * this.m_s2 * this.m_s2;
        var k12 = i1 * this.m_s1 + i2 * this.m_s2;
        var k22 = i1 + i2;
        this.m_K.col1.Set(k11, k12, 0.0);
        this.m_K.col2.Set(k12, k22, 0.0);
        var impulse1 = this.m_K.Solve22(new b2Vec2(), -C1X, -C1Y);
        impulse.x = impulse1.x;
        impulse.y = impulse1.y;
        impulse.z = 0.0;
      }
      var PX = impulse.x * this.m_perp.x + impulse.z * this.m_axis.x;
      var PY = impulse.x * this.m_perp.y + impulse.z * this.m_axis.y;
      var L1 = impulse.x * this.m_s1 + impulse.y + impulse.z * this.m_a1;
      var L2 = impulse.x * this.m_s2 + impulse.y + impulse.z * this.m_a2;
      c1.x -= this.m_invMassA * PX;
      c1.y -= this.m_invMassA * PY;
      a1 -= this.m_invIA * L1;
      c2.x += this.m_invMassB * PX;
      c2.y += this.m_invMassB * PY;
      a2 += this.m_invIB * L2;
      bA.m_sweep.a = a1;
      bB.m_sweep.a = a2;
      bA.SynchronizeTransform();
      bB.SynchronizeTransform();
      return (
        linearError <= b2Settings.b2_linearSlop &&
        angularError <= b2Settings.b2_angularSlop
      );
    };
    Box2D.inherit(b2PrismaticJointDef, Box2D.Dynamics.Joints.b2JointDef);
    b2PrismaticJointDef.prototype.__super =
      Box2D.Dynamics.Joints.b2JointDef.prototype;
    b2PrismaticJointDef.b2PrismaticJointDef = function () {
      Box2D.Dynamics.Joints.b2JointDef.b2JointDef.apply(this, arguments);
      this.localAnchorA = new b2Vec2();
      this.localAnchorB = new b2Vec2();
      this.localAxisA = new b2Vec2();
    };
    b2PrismaticJointDef.prototype.b2PrismaticJointDef = function () {
      this.__super.b2JointDef.call(this);
      this.type = b2Joint.e_prismaticJoint;
      this.localAxisA.Set(1.0, 0.0);
      this.referenceAngle = 0.0;
      this.enableLimit = false;
      this.lowerTranslation = 0.0;
      this.upperTranslation = 0.0;
      this.enableMotor = false;
      this.maxMotorForce = 0.0;
      this.motorSpeed = 0.0;
    };
    b2PrismaticJointDef.prototype.Initialize = function (bA, bB, anchor, axis) {
      this.bodyA = bA;
      this.bodyB = bB;
      this.localAnchorA = this.bodyA.GetLocalPoint(anchor);
      this.localAnchorB = this.bodyB.GetLocalPoint(anchor);
      this.localAxisA = this.bodyA.GetLocalVector(axis);
      this.referenceAngle = this.bodyB.GetAngle() - this.bodyA.GetAngle();
    };
    Box2D.inherit(b2PulleyJoint, Box2D.Dynamics.Joints.b2Joint);
    b2PulleyJoint.prototype.__super = Box2D.Dynamics.Joints.b2Joint.prototype;
    b2PulleyJoint.b2PulleyJoint = function () {
      Box2D.Dynamics.Joints.b2Joint.b2Joint.apply(this, arguments);
      this.m_groundAnchor1 = new b2Vec2();
      this.m_groundAnchor2 = new b2Vec2();
      this.m_localAnchor1 = new b2Vec2();
      this.m_localAnchor2 = new b2Vec2();
      this.m_u1 = new b2Vec2();
      this.m_u2 = new b2Vec2();
    };
    b2PulleyJoint.prototype.GetAnchorA = function () {
      return this.m_bodyA.GetWorldPoint(this.m_localAnchor1);
    };
    b2PulleyJoint.prototype.GetAnchorB = function () {
      return this.m_bodyB.GetWorldPoint(this.m_localAnchor2);
    };
    b2PulleyJoint.prototype.GetReactionForce = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return new b2Vec2(
        inv_dt * this.m_impulse * this.m_u2.x,
        inv_dt * this.m_impulse * this.m_u2.y
      );
    };
    b2PulleyJoint.prototype.GetReactionTorque = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return 0.0;
    };
    b2PulleyJoint.prototype.GetGroundAnchorA = function () {
      var a = this.m_ground.m_xf.position.Copy();
      a.Add(this.m_groundAnchor1);
      return a;
    };
    b2PulleyJoint.prototype.GetGroundAnchorB = function () {
      var a = this.m_ground.m_xf.position.Copy();
      a.Add(this.m_groundAnchor2);
      return a;
    };
    b2PulleyJoint.prototype.GetLength1 = function () {
      var p = this.m_bodyA.GetWorldPoint(this.m_localAnchor1);
      var sX = this.m_ground.m_xf.position.x + this.m_groundAnchor1.x;
      var sY = this.m_ground.m_xf.position.y + this.m_groundAnchor1.y;
      var dX = p.x - sX;
      var dY = p.y - sY;
      return Math.sqrt(dX * dX + dY * dY);
    };
    b2PulleyJoint.prototype.GetLength2 = function () {
      var p = this.m_bodyB.GetWorldPoint(this.m_localAnchor2);
      var sX = this.m_ground.m_xf.position.x + this.m_groundAnchor2.x;
      var sY = this.m_ground.m_xf.position.y + this.m_groundAnchor2.y;
      var dX = p.x - sX;
      var dY = p.y - sY;
      return Math.sqrt(dX * dX + dY * dY);
    };
    b2PulleyJoint.prototype.GetRatio = function () {
      return this.m_ratio;
    };
    b2PulleyJoint.prototype.b2PulleyJoint = function (def) {
      this.__super.b2Joint.call(this, def);
      var tMat;
      var tX = 0;
      var tY = 0;
      this.m_ground = this.m_bodyA.m_world.m_groundBody;
      this.m_groundAnchor1.x =
        def.groundAnchorA.x - this.m_ground.m_xf.position.x;
      this.m_groundAnchor1.y =
        def.groundAnchorA.y - this.m_ground.m_xf.position.y;
      this.m_groundAnchor2.x =
        def.groundAnchorB.x - this.m_ground.m_xf.position.x;
      this.m_groundAnchor2.y =
        def.groundAnchorB.y - this.m_ground.m_xf.position.y;
      this.m_localAnchor1.SetV(def.localAnchorA);
      this.m_localAnchor2.SetV(def.localAnchorB);
      this.m_ratio = def.ratio;
      this.m_constant = def.lengthA + this.m_ratio * def.lengthB;
      this.m_maxLength1 = b2Math.Min(
        def.maxLengthA,
        this.m_constant - this.m_ratio * b2PulleyJoint.b2_minPulleyLength
      );
      this.m_maxLength2 = b2Math.Min(
        def.maxLengthB,
        (this.m_constant - b2PulleyJoint.b2_minPulleyLength) / this.m_ratio
      );
      this.m_impulse = 0.0;
      this.m_limitImpulse1 = 0.0;
      this.m_limitImpulse2 = 0.0;
    };
    b2PulleyJoint.prototype.InitVelocityConstraints = function (step) {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      tMat = bA.m_xf.R;
      var r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
      var r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
      var tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = bB.m_xf.R;
      var r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
      var r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var p1X = bA.m_sweep.c.x + r1X;
      var p1Y = bA.m_sweep.c.y + r1Y;
      var p2X = bB.m_sweep.c.x + r2X;
      var p2Y = bB.m_sweep.c.y + r2Y;
      var s1X = this.m_ground.m_xf.position.x + this.m_groundAnchor1.x;
      var s1Y = this.m_ground.m_xf.position.y + this.m_groundAnchor1.y;
      var s2X = this.m_ground.m_xf.position.x + this.m_groundAnchor2.x;
      var s2Y = this.m_ground.m_xf.position.y + this.m_groundAnchor2.y;
      this.m_u1.Set(p1X - s1X, p1Y - s1Y);
      this.m_u2.Set(p2X - s2X, p2Y - s2Y);
      var length1 = this.m_u1.Length();
      var length2 = this.m_u2.Length();
      if (length1 > b2Settings.b2_linearSlop) {
        this.m_u1.Multiply(1.0 / length1);
      } else {
        this.m_u1.SetZero();
      }
      if (length2 > b2Settings.b2_linearSlop) {
        this.m_u2.Multiply(1.0 / length2);
      } else {
        this.m_u2.SetZero();
      }
      var C = this.m_constant - length1 - this.m_ratio * length2;
      if (C > 0.0) {
        this.m_state = b2Joint.e_inactiveLimit;
        this.m_impulse = 0.0;
      } else {
        this.m_state = b2Joint.e_atUpperLimit;
      }
      if (length1 < this.m_maxLength1) {
        this.m_limitState1 = b2Joint.e_inactiveLimit;
        this.m_limitImpulse1 = 0.0;
      } else {
        this.m_limitState1 = b2Joint.e_atUpperLimit;
      }
      if (length2 < this.m_maxLength2) {
        this.m_limitState2 = b2Joint.e_inactiveLimit;
        this.m_limitImpulse2 = 0.0;
      } else {
        this.m_limitState2 = b2Joint.e_atUpperLimit;
      }
      var cr1u1 = r1X * this.m_u1.y - r1Y * this.m_u1.x;
      var cr2u2 = r2X * this.m_u2.y - r2Y * this.m_u2.x;
      this.m_limitMass1 = bA.m_invMass + bA.m_invI * cr1u1 * cr1u1;
      this.m_limitMass2 = bB.m_invMass + bB.m_invI * cr2u2 * cr2u2;
      this.m_pulleyMass =
        this.m_limitMass1 + this.m_ratio * this.m_ratio * this.m_limitMass2;
      this.m_limitMass1 = 1.0 / this.m_limitMass1;
      this.m_limitMass2 = 1.0 / this.m_limitMass2;
      this.m_pulleyMass = 1.0 / this.m_pulleyMass;
      if (step.warmStarting) {
        this.m_impulse *= step.dtRatio;
        this.m_limitImpulse1 *= step.dtRatio;
        this.m_limitImpulse2 *= step.dtRatio;
        var P1X = (-this.m_impulse - this.m_limitImpulse1) * this.m_u1.x;
        var P1Y = (-this.m_impulse - this.m_limitImpulse1) * this.m_u1.y;
        var P2X =
          (-this.m_ratio * this.m_impulse - this.m_limitImpulse2) * this.m_u2.x;
        var P2Y =
          (-this.m_ratio * this.m_impulse - this.m_limitImpulse2) * this.m_u2.y;
        bA.m_linearVelocity.x += bA.m_invMass * P1X;
        bA.m_linearVelocity.y += bA.m_invMass * P1Y;
        bA.m_angularVelocity += bA.m_invI * (r1X * P1Y - r1Y * P1X);
        bB.m_linearVelocity.x += bB.m_invMass * P2X;
        bB.m_linearVelocity.y += bB.m_invMass * P2Y;
        bB.m_angularVelocity += bB.m_invI * (r2X * P2Y - r2Y * P2X);
      } else {
        this.m_impulse = 0.0;
        this.m_limitImpulse1 = 0.0;
        this.m_limitImpulse2 = 0.0;
      }
    };
    b2PulleyJoint.prototype.SolveVelocityConstraints = function (step) {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      tMat = bA.m_xf.R;
      var r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
      var r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
      var tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = bB.m_xf.R;
      var r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
      var r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var v1X = 0;
      var v1Y = 0;
      var v2X = 0;
      var v2Y = 0;
      var P1X = 0;
      var P1Y = 0;
      var P2X = 0;
      var P2Y = 0;
      var Cdot = 0;
      var impulse = 0;
      var oldImpulse = 0;
      if (this.m_state == b2Joint.e_atUpperLimit) {
        v1X = bA.m_linearVelocity.x + -bA.m_angularVelocity * r1Y;
        v1Y = bA.m_linearVelocity.y + bA.m_angularVelocity * r1X;
        v2X = bB.m_linearVelocity.x + -bB.m_angularVelocity * r2Y;
        v2Y = bB.m_linearVelocity.y + bB.m_angularVelocity * r2X;
        Cdot =
          -(this.m_u1.x * v1X + this.m_u1.y * v1Y) -
          this.m_ratio * (this.m_u2.x * v2X + this.m_u2.y * v2Y);
        impulse = this.m_pulleyMass * -Cdot;
        oldImpulse = this.m_impulse;
        this.m_impulse = b2Math.Max(0.0, this.m_impulse + impulse);
        impulse = this.m_impulse - oldImpulse;
        P1X = -impulse * this.m_u1.x;
        P1Y = -impulse * this.m_u1.y;
        P2X = -this.m_ratio * impulse * this.m_u2.x;
        P2Y = -this.m_ratio * impulse * this.m_u2.y;
        bA.m_linearVelocity.x += bA.m_invMass * P1X;
        bA.m_linearVelocity.y += bA.m_invMass * P1Y;
        bA.m_angularVelocity += bA.m_invI * (r1X * P1Y - r1Y * P1X);
        bB.m_linearVelocity.x += bB.m_invMass * P2X;
        bB.m_linearVelocity.y += bB.m_invMass * P2Y;
        bB.m_angularVelocity += bB.m_invI * (r2X * P2Y - r2Y * P2X);
      }
      if (this.m_limitState1 == b2Joint.e_atUpperLimit) {
        v1X = bA.m_linearVelocity.x + -bA.m_angularVelocity * r1Y;
        v1Y = bA.m_linearVelocity.y + bA.m_angularVelocity * r1X;
        Cdot = -(this.m_u1.x * v1X + this.m_u1.y * v1Y);
        impulse = -this.m_limitMass1 * Cdot;
        oldImpulse = this.m_limitImpulse1;
        this.m_limitImpulse1 = b2Math.Max(0.0, this.m_limitImpulse1 + impulse);
        impulse = this.m_limitImpulse1 - oldImpulse;
        P1X = -impulse * this.m_u1.x;
        P1Y = -impulse * this.m_u1.y;
        bA.m_linearVelocity.x += bA.m_invMass * P1X;
        bA.m_linearVelocity.y += bA.m_invMass * P1Y;
        bA.m_angularVelocity += bA.m_invI * (r1X * P1Y - r1Y * P1X);
      }
      if (this.m_limitState2 == b2Joint.e_atUpperLimit) {
        v2X = bB.m_linearVelocity.x + -bB.m_angularVelocity * r2Y;
        v2Y = bB.m_linearVelocity.y + bB.m_angularVelocity * r2X;
        Cdot = -(this.m_u2.x * v2X + this.m_u2.y * v2Y);
        impulse = -this.m_limitMass2 * Cdot;
        oldImpulse = this.m_limitImpulse2;
        this.m_limitImpulse2 = b2Math.Max(0.0, this.m_limitImpulse2 + impulse);
        impulse = this.m_limitImpulse2 - oldImpulse;
        P2X = -impulse * this.m_u2.x;
        P2Y = -impulse * this.m_u2.y;
        bB.m_linearVelocity.x += bB.m_invMass * P2X;
        bB.m_linearVelocity.y += bB.m_invMass * P2Y;
        bB.m_angularVelocity += bB.m_invI * (r2X * P2Y - r2Y * P2X);
      }
    };
    b2PulleyJoint.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      var s1X = this.m_ground.m_xf.position.x + this.m_groundAnchor1.x;
      var s1Y = this.m_ground.m_xf.position.y + this.m_groundAnchor1.y;
      var s2X = this.m_ground.m_xf.position.x + this.m_groundAnchor2.x;
      var s2Y = this.m_ground.m_xf.position.y + this.m_groundAnchor2.y;
      var r1X = 0;
      var r1Y = 0;
      var r2X = 0;
      var r2Y = 0;
      var p1X = 0;
      var p1Y = 0;
      var p2X = 0;
      var p2Y = 0;
      var length1 = 0;
      var length2 = 0;
      var C = 0;
      var impulse = 0;
      var oldImpulse = 0;
      var oldLimitPositionImpulse = 0;
      var tX = 0;
      var linearError = 0.0;
      if (this.m_state == b2Joint.e_atUpperLimit) {
        tMat = bA.m_xf.R;
        r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
        r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
        tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
        r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
        r1X = tX;
        tMat = bB.m_xf.R;
        r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
        r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
        tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
        r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
        r2X = tX;
        p1X = bA.m_sweep.c.x + r1X;
        p1Y = bA.m_sweep.c.y + r1Y;
        p2X = bB.m_sweep.c.x + r2X;
        p2Y = bB.m_sweep.c.y + r2Y;
        this.m_u1.Set(p1X - s1X, p1Y - s1Y);
        this.m_u2.Set(p2X - s2X, p2Y - s2Y);
        length1 = this.m_u1.Length();
        length2 = this.m_u2.Length();
        if (length1 > b2Settings.b2_linearSlop) {
          this.m_u1.Multiply(1.0 / length1);
        } else {
          this.m_u1.SetZero();
        }
        if (length2 > b2Settings.b2_linearSlop) {
          this.m_u2.Multiply(1.0 / length2);
        } else {
          this.m_u2.SetZero();
        }
        C = this.m_constant - length1 - this.m_ratio * length2;
        linearError = b2Math.Max(linearError, -C);
        C = b2Math.Clamp(
          C + b2Settings.b2_linearSlop,
          -b2Settings.b2_maxLinearCorrection,
          0.0
        );
        impulse = -this.m_pulleyMass * C;
        p1X = -impulse * this.m_u1.x;
        p1Y = -impulse * this.m_u1.y;
        p2X = -this.m_ratio * impulse * this.m_u2.x;
        p2Y = -this.m_ratio * impulse * this.m_u2.y;
        bA.m_sweep.c.x += bA.m_invMass * p1X;
        bA.m_sweep.c.y += bA.m_invMass * p1Y;
        bA.m_sweep.a += bA.m_invI * (r1X * p1Y - r1Y * p1X);
        bB.m_sweep.c.x += bB.m_invMass * p2X;
        bB.m_sweep.c.y += bB.m_invMass * p2Y;
        bB.m_sweep.a += bB.m_invI * (r2X * p2Y - r2Y * p2X);
        bA.SynchronizeTransform();
        bB.SynchronizeTransform();
      }
      if (this.m_limitState1 == b2Joint.e_atUpperLimit) {
        tMat = bA.m_xf.R;
        r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
        r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
        tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
        r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
        r1X = tX;
        p1X = bA.m_sweep.c.x + r1X;
        p1Y = bA.m_sweep.c.y + r1Y;
        this.m_u1.Set(p1X - s1X, p1Y - s1Y);
        length1 = this.m_u1.Length();
        if (length1 > b2Settings.b2_linearSlop) {
          this.m_u1.x *= 1.0 / length1;
          this.m_u1.y *= 1.0 / length1;
        } else {
          this.m_u1.SetZero();
        }
        C = this.m_maxLength1 - length1;
        linearError = b2Math.Max(linearError, -C);
        C = b2Math.Clamp(
          C + b2Settings.b2_linearSlop,
          -b2Settings.b2_maxLinearCorrection,
          0.0
        );
        impulse = -this.m_limitMass1 * C;
        p1X = -impulse * this.m_u1.x;
        p1Y = -impulse * this.m_u1.y;
        bA.m_sweep.c.x += bA.m_invMass * p1X;
        bA.m_sweep.c.y += bA.m_invMass * p1Y;
        bA.m_sweep.a += bA.m_invI * (r1X * p1Y - r1Y * p1X);
        bA.SynchronizeTransform();
      }
      if (this.m_limitState2 == b2Joint.e_atUpperLimit) {
        tMat = bB.m_xf.R;
        r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
        r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
        tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
        r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
        r2X = tX;
        p2X = bB.m_sweep.c.x + r2X;
        p2Y = bB.m_sweep.c.y + r2Y;
        this.m_u2.Set(p2X - s2X, p2Y - s2Y);
        length2 = this.m_u2.Length();
        if (length2 > b2Settings.b2_linearSlop) {
          this.m_u2.x *= 1.0 / length2;
          this.m_u2.y *= 1.0 / length2;
        } else {
          this.m_u2.SetZero();
        }
        C = this.m_maxLength2 - length2;
        linearError = b2Math.Max(linearError, -C);
        C = b2Math.Clamp(
          C + b2Settings.b2_linearSlop,
          -b2Settings.b2_maxLinearCorrection,
          0.0
        );
        impulse = -this.m_limitMass2 * C;
        p2X = -impulse * this.m_u2.x;
        p2Y = -impulse * this.m_u2.y;
        bB.m_sweep.c.x += bB.m_invMass * p2X;
        bB.m_sweep.c.y += bB.m_invMass * p2Y;
        bB.m_sweep.a += bB.m_invI * (r2X * p2Y - r2Y * p2X);
        bB.SynchronizeTransform();
      }
      return linearError < b2Settings.b2_linearSlop;
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.Joints.b2PulleyJoint.b2_minPulleyLength = 2.0;
    });
    Box2D.inherit(b2PulleyJointDef, Box2D.Dynamics.Joints.b2JointDef);
    b2PulleyJointDef.prototype.__super =
      Box2D.Dynamics.Joints.b2JointDef.prototype;
    b2PulleyJointDef.b2PulleyJointDef = function () {
      Box2D.Dynamics.Joints.b2JointDef.b2JointDef.apply(this, arguments);
      this.groundAnchorA = new b2Vec2();
      this.groundAnchorB = new b2Vec2();
      this.localAnchorA = new b2Vec2();
      this.localAnchorB = new b2Vec2();
    };
    b2PulleyJointDef.prototype.b2PulleyJointDef = function () {
      this.__super.b2JointDef.call(this);
      this.type = b2Joint.e_pulleyJoint;
      this.groundAnchorA.Set(-1.0, 1.0);
      this.groundAnchorB.Set(1.0, 1.0);
      this.localAnchorA.Set(-1.0, 0.0);
      this.localAnchorB.Set(1.0, 0.0);
      this.lengthA = 0.0;
      this.maxLengthA = 0.0;
      this.lengthB = 0.0;
      this.maxLengthB = 0.0;
      this.ratio = 1.0;
      this.collideConnected = true;
    };
    b2PulleyJointDef.prototype.Initialize = function (
      bA,
      bB,
      gaA,
      gaB,
      anchorA,
      anchorB,
      r
    ) {
      if (r === undefined) r = 0;
      this.bodyA = bA;
      this.bodyB = bB;
      this.groundAnchorA.SetV(gaA);
      this.groundAnchorB.SetV(gaB);
      this.localAnchorA = this.bodyA.GetLocalPoint(anchorA);
      this.localAnchorB = this.bodyB.GetLocalPoint(anchorB);
      var d1X = anchorA.x - gaA.x;
      var d1Y = anchorA.y - gaA.y;
      this.lengthA = Math.sqrt(d1X * d1X + d1Y * d1Y);
      var d2X = anchorB.x - gaB.x;
      var d2Y = anchorB.y - gaB.y;
      this.lengthB = Math.sqrt(d2X * d2X + d2Y * d2Y);
      this.ratio = r;
      var C = this.lengthA + this.ratio * this.lengthB;
      this.maxLengthA = C - this.ratio * b2PulleyJoint.b2_minPulleyLength;
      this.maxLengthB = (C - b2PulleyJoint.b2_minPulleyLength) / this.ratio;
    };
    Box2D.inherit(b2RevoluteJoint, Box2D.Dynamics.Joints.b2Joint);
    b2RevoluteJoint.prototype.__super = Box2D.Dynamics.Joints.b2Joint.prototype;
    b2RevoluteJoint.b2RevoluteJoint = function () {
      Box2D.Dynamics.Joints.b2Joint.b2Joint.apply(this, arguments);
      this.K = new b2Mat22();
      this.K1 = new b2Mat22();
      this.K2 = new b2Mat22();
      this.K3 = new b2Mat22();
      this.impulse3 = new b2Vec3();
      this.impulse2 = new b2Vec2();
      this.reduced = new b2Vec2();
      this.m_localAnchor1 = new b2Vec2();
      this.m_localAnchor2 = new b2Vec2();
      this.m_impulse = new b2Vec3();
      this.m_mass = new b2Mat33();
    };
    b2RevoluteJoint.prototype.GetAnchorA = function () {
      return this.m_bodyA.GetWorldPoint(this.m_localAnchor1);
    };
    b2RevoluteJoint.prototype.GetAnchorB = function () {
      return this.m_bodyB.GetWorldPoint(this.m_localAnchor2);
    };
    b2RevoluteJoint.prototype.GetReactionForce = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return new b2Vec2(inv_dt * this.m_impulse.x, inv_dt * this.m_impulse.y);
    };
    b2RevoluteJoint.prototype.GetReactionTorque = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return inv_dt * this.m_impulse.z;
    };
    b2RevoluteJoint.prototype.GetJointAngle = function () {
      return (
        this.m_bodyB.m_sweep.a - this.m_bodyA.m_sweep.a - this.m_referenceAngle
      );
    };
    b2RevoluteJoint.prototype.GetJointSpeed = function () {
      return this.m_bodyB.m_angularVelocity - this.m_bodyA.m_angularVelocity;
    };
    b2RevoluteJoint.prototype.IsLimitEnabled = function () {
      return this.m_enableLimit;
    };
    b2RevoluteJoint.prototype.EnableLimit = function (flag) {
      this.m_enableLimit = flag;
    };
    b2RevoluteJoint.prototype.GetLowerLimit = function () {
      return this.m_lowerAngle;
    };
    b2RevoluteJoint.prototype.GetUpperLimit = function () {
      return this.m_upperAngle;
    };
    b2RevoluteJoint.prototype.SetLimits = function (lower, upper) {
      if (lower === undefined) lower = 0;
      if (upper === undefined) upper = 0;
      this.m_lowerAngle = lower;
      this.m_upperAngle = upper;
    };
    b2RevoluteJoint.prototype.IsMotorEnabled = function () {
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      return this.m_enableMotor;
    };
    b2RevoluteJoint.prototype.EnableMotor = function (flag) {
      this.m_enableMotor = flag;
    };
    b2RevoluteJoint.prototype.SetMotorSpeed = function (speed) {
      if (speed === undefined) speed = 0;
      this.m_bodyA.SetAwake(true);
      this.m_bodyB.SetAwake(true);
      this.m_motorSpeed = speed;
    };
    b2RevoluteJoint.prototype.GetMotorSpeed = function () {
      return this.m_motorSpeed;
    };
    b2RevoluteJoint.prototype.SetMaxMotorTorque = function (torque) {
      if (torque === undefined) torque = 0;
      this.m_maxMotorTorque = torque;
    };
    b2RevoluteJoint.prototype.GetMotorTorque = function () {
      return this.m_maxMotorTorque;
    };
    b2RevoluteJoint.prototype.b2RevoluteJoint = function (def) {
      this.__super.b2Joint.call(this, def);
      this.m_localAnchor1.SetV(def.localAnchorA);
      this.m_localAnchor2.SetV(def.localAnchorB);
      this.m_referenceAngle = def.referenceAngle;
      this.m_impulse.SetZero();
      this.m_motorImpulse = 0.0;
      this.m_lowerAngle = def.lowerAngle;
      this.m_upperAngle = def.upperAngle;
      this.m_maxMotorTorque = def.maxMotorTorque;
      this.m_motorSpeed = def.motorSpeed;
      this.m_enableLimit = def.enableLimit;
      this.m_enableMotor = def.enableMotor;
      this.m_limitState = b2Joint.e_inactiveLimit;
    };
    b2RevoluteJoint.prototype.InitVelocityConstraints = function (step) {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      var tX = 0;
      if (this.m_enableMotor || this.m_enableLimit) {
      }
      tMat = bA.m_xf.R;
      var r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
      var r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
      tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
      r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
      r1X = tX;
      tMat = bB.m_xf.R;
      var r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
      var r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
      r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
      r2X = tX;
      var m1 = bA.m_invMass;
      var m2 = bB.m_invMass;
      var i1 = bA.m_invI;
      var i2 = bB.m_invI;
      this.m_mass.col1.x = m1 + m2 + r1Y * r1Y * i1 + r2Y * r2Y * i2;
      this.m_mass.col2.x = -r1Y * r1X * i1 - r2Y * r2X * i2;
      this.m_mass.col3.x = -r1Y * i1 - r2Y * i2;
      this.m_mass.col1.y = this.m_mass.col2.x;
      this.m_mass.col2.y = m1 + m2 + r1X * r1X * i1 + r2X * r2X * i2;
      this.m_mass.col3.y = r1X * i1 + r2X * i2;
      this.m_mass.col1.z = this.m_mass.col3.x;
      this.m_mass.col2.z = this.m_mass.col3.y;
      this.m_mass.col3.z = i1 + i2;
      this.m_motorMass = 1.0 / (i1 + i2);
      if (this.m_enableMotor == false) {
        this.m_motorImpulse = 0.0;
      }
      if (this.m_enableLimit) {
        var jointAngle = bB.m_sweep.a - bA.m_sweep.a - this.m_referenceAngle;
        if (
          b2Math.Abs(this.m_upperAngle - this.m_lowerAngle) <
          2.0 * b2Settings.b2_angularSlop
        ) {
          this.m_limitState = b2Joint.e_equalLimits;
        } else if (jointAngle <= this.m_lowerAngle) {
          if (this.m_limitState != b2Joint.e_atLowerLimit) {
            this.m_impulse.z = 0.0;
          }
          this.m_limitState = b2Joint.e_atLowerLimit;
        } else if (jointAngle >= this.m_upperAngle) {
          if (this.m_limitState != b2Joint.e_atUpperLimit) {
            this.m_impulse.z = 0.0;
          }
          this.m_limitState = b2Joint.e_atUpperLimit;
        } else {
          this.m_limitState = b2Joint.e_inactiveLimit;
          this.m_impulse.z = 0.0;
        }
      } else {
        this.m_limitState = b2Joint.e_inactiveLimit;
      }
      if (step.warmStarting) {
        this.m_impulse.x *= step.dtRatio;
        this.m_impulse.y *= step.dtRatio;
        this.m_motorImpulse *= step.dtRatio;
        var PX = this.m_impulse.x;
        var PY = this.m_impulse.y;
        bA.m_linearVelocity.x -= m1 * PX;
        bA.m_linearVelocity.y -= m1 * PY;
        bA.m_angularVelocity -=
          i1 * (r1X * PY - r1Y * PX + this.m_motorImpulse + this.m_impulse.z);
        bB.m_linearVelocity.x += m2 * PX;
        bB.m_linearVelocity.y += m2 * PY;
        bB.m_angularVelocity +=
          i2 * (r2X * PY - r2Y * PX + this.m_motorImpulse + this.m_impulse.z);
      } else {
        this.m_impulse.SetZero();
        this.m_motorImpulse = 0.0;
      }
    };
    b2RevoluteJoint.prototype.SolveVelocityConstraints = function (step) {
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var tMat;
      var tX = 0;
      var newImpulse = 0;
      var r1X = 0;
      var r1Y = 0;
      var r2X = 0;
      var r2Y = 0;
      var v1 = bA.m_linearVelocity;
      var w1 = bA.m_angularVelocity;
      var v2 = bB.m_linearVelocity;
      var w2 = bB.m_angularVelocity;
      var m1 = bA.m_invMass;
      var m2 = bB.m_invMass;
      var i1 = bA.m_invI;
      var i2 = bB.m_invI;
      if (this.m_enableMotor && this.m_limitState != b2Joint.e_equalLimits) {
        var Cdot = w2 - w1 - this.m_motorSpeed;
        var impulse = this.m_motorMass * -Cdot;
        var oldImpulse = this.m_motorImpulse;
        var maxImpulse = step.dt * this.m_maxMotorTorque;
        this.m_motorImpulse = b2Math.Clamp(
          this.m_motorImpulse + impulse,
          -maxImpulse,
          maxImpulse
        );
        impulse = this.m_motorImpulse - oldImpulse;
        w1 -= i1 * impulse;
        w2 += i2 * impulse;
      }
      if (this.m_enableLimit && this.m_limitState != b2Joint.e_inactiveLimit) {
        tMat = bA.m_xf.R;
        r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
        r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
        tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
        r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
        r1X = tX;
        tMat = bB.m_xf.R;
        r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
        r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
        tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
        r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
        r2X = tX;
        var Cdot1X = v2.x + -w2 * r2Y - v1.x - -w1 * r1Y;
        var Cdot1Y = v2.y + w2 * r2X - v1.y - w1 * r1X;
        var Cdot2 = w2 - w1;
        this.m_mass.Solve33(this.impulse3, -Cdot1X, -Cdot1Y, -Cdot2);
        if (this.m_limitState == b2Joint.e_equalLimits) {
          this.m_impulse.Add(this.impulse3);
        } else if (this.m_limitState == b2Joint.e_atLowerLimit) {
          newImpulse = this.m_impulse.z + this.impulse3.z;
          if (newImpulse < 0.0) {
            this.m_mass.Solve22(this.reduced, -Cdot1X, -Cdot1Y);
            this.impulse3.x = this.reduced.x;
            this.impulse3.y = this.reduced.y;
            this.impulse3.z = -this.m_impulse.z;
            this.m_impulse.x += this.reduced.x;
            this.m_impulse.y += this.reduced.y;
            this.m_impulse.z = 0.0;
          }
        } else if (this.m_limitState == b2Joint.e_atUpperLimit) {
          newImpulse = this.m_impulse.z + this.impulse3.z;
          if (newImpulse > 0.0) {
            this.m_mass.Solve22(this.reduced, -Cdot1X, -Cdot1Y);
            this.impulse3.x = this.reduced.x;
            this.impulse3.y = this.reduced.y;
            this.impulse3.z = -this.m_impulse.z;
            this.m_impulse.x += this.reduced.x;
            this.m_impulse.y += this.reduced.y;
            this.m_impulse.z = 0.0;
          }
        }
        v1.x -= m1 * this.impulse3.x;
        v1.y -= m1 * this.impulse3.y;
        w1 -=
          i1 *
          (r1X * this.impulse3.y - r1Y * this.impulse3.x + this.impulse3.z);
        v2.x += m2 * this.impulse3.x;
        v2.y += m2 * this.impulse3.y;
        w2 +=
          i2 *
          (r2X * this.impulse3.y - r2Y * this.impulse3.x + this.impulse3.z);
      } else {
        tMat = bA.m_xf.R;
        r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
        r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
        tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
        r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
        r1X = tX;
        tMat = bB.m_xf.R;
        r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
        r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
        tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
        r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
        r2X = tX;
        var CdotX = v2.x + -w2 * r2Y - v1.x - -w1 * r1Y;
        var CdotY = v2.y + w2 * r2X - v1.y - w1 * r1X;
        this.m_mass.Solve22(this.impulse2, -CdotX, -CdotY);
        this.m_impulse.x += this.impulse2.x;
        this.m_impulse.y += this.impulse2.y;
        v1.x -= m1 * this.impulse2.x;
        v1.y -= m1 * this.impulse2.y;
        w1 -= i1 * (r1X * this.impulse2.y - r1Y * this.impulse2.x);
        v2.x += m2 * this.impulse2.x;
        v2.y += m2 * this.impulse2.y;
        w2 += i2 * (r2X * this.impulse2.y - r2Y * this.impulse2.x);
      }
      bA.m_linearVelocity.SetV(v1);
      bA.m_angularVelocity = w1;
      bB.m_linearVelocity.SetV(v2);
      bB.m_angularVelocity = w2;
    };
    b2RevoluteJoint.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      var oldLimitImpulse = 0;
      var C = 0;
      var tMat;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var angularError = 0.0;
      var positionError = 0.0;
      var tX = 0;
      var impulseX = 0;
      var impulseY = 0;
      if (this.m_enableLimit && this.m_limitState != b2Joint.e_inactiveLimit) {
        var angle = bB.m_sweep.a - bA.m_sweep.a - this.m_referenceAngle;
        var limitImpulse = 0.0;
        if (this.m_limitState == b2Joint.e_equalLimits) {
          C = b2Math.Clamp(
            angle - this.m_lowerAngle,
            -b2Settings.b2_maxAngularCorrection,
            b2Settings.b2_maxAngularCorrection
          );
          limitImpulse = -this.m_motorMass * C;
          angularError = b2Math.Abs(C);
        } else if (this.m_limitState == b2Joint.e_atLowerLimit) {
          C = angle - this.m_lowerAngle;
          angularError = -C;
          C = b2Math.Clamp(
            C + b2Settings.b2_angularSlop,
            -b2Settings.b2_maxAngularCorrection,
            0.0
          );
          limitImpulse = -this.m_motorMass * C;
        } else if (this.m_limitState == b2Joint.e_atUpperLimit) {
          C = angle - this.m_upperAngle;
          angularError = C;
          C = b2Math.Clamp(
            C - b2Settings.b2_angularSlop,
            0.0,
            b2Settings.b2_maxAngularCorrection
          );
          limitImpulse = -this.m_motorMass * C;
        }
        bA.m_sweep.a -= bA.m_invI * limitImpulse;
        bB.m_sweep.a += bB.m_invI * limitImpulse;
        bA.SynchronizeTransform();
        bB.SynchronizeTransform();
      }
      {
        tMat = bA.m_xf.R;
        var r1X = this.m_localAnchor1.x - bA.m_sweep.localCenter.x;
        var r1Y = this.m_localAnchor1.y - bA.m_sweep.localCenter.y;
        tX = tMat.col1.x * r1X + tMat.col2.x * r1Y;
        r1Y = tMat.col1.y * r1X + tMat.col2.y * r1Y;
        r1X = tX;
        tMat = bB.m_xf.R;
        var r2X = this.m_localAnchor2.x - bB.m_sweep.localCenter.x;
        var r2Y = this.m_localAnchor2.y - bB.m_sweep.localCenter.y;
        tX = tMat.col1.x * r2X + tMat.col2.x * r2Y;
        r2Y = tMat.col1.y * r2X + tMat.col2.y * r2Y;
        r2X = tX;
        var CX = bB.m_sweep.c.x + r2X - bA.m_sweep.c.x - r1X;
        var CY = bB.m_sweep.c.y + r2Y - bA.m_sweep.c.y - r1Y;
        var CLengthSquared = CX * CX + CY * CY;
        var CLength = Math.sqrt(CLengthSquared);
        positionError = CLength;
        var invMass1 = bA.m_invMass;
        var invMass2 = bB.m_invMass;
        var invI1 = bA.m_invI;
        var invI2 = bB.m_invI;
        var k_allowedStretch = 10.0 * b2Settings.b2_linearSlop;
        if (CLengthSquared > k_allowedStretch * k_allowedStretch) {
          var uX = CX / CLength;
          var uY = CY / CLength;
          var k = invMass1 + invMass2;
          var m = 1.0 / k;
          impulseX = m * -CX;
          impulseY = m * -CY;
          var k_beta = 0.5;
          bA.m_sweep.c.x -= k_beta * invMass1 * impulseX;
          bA.m_sweep.c.y -= k_beta * invMass1 * impulseY;
          bB.m_sweep.c.x += k_beta * invMass2 * impulseX;
          bB.m_sweep.c.y += k_beta * invMass2 * impulseY;
          CX = bB.m_sweep.c.x + r2X - bA.m_sweep.c.x - r1X;
          CY = bB.m_sweep.c.y + r2Y - bA.m_sweep.c.y - r1Y;
        }
        this.K1.col1.x = invMass1 + invMass2;
        this.K1.col2.x = 0.0;
        this.K1.col1.y = 0.0;
        this.K1.col2.y = invMass1 + invMass2;
        this.K2.col1.x = invI1 * r1Y * r1Y;
        this.K2.col2.x = -invI1 * r1X * r1Y;
        this.K2.col1.y = -invI1 * r1X * r1Y;
        this.K2.col2.y = invI1 * r1X * r1X;
        this.K3.col1.x = invI2 * r2Y * r2Y;
        this.K3.col2.x = -invI2 * r2X * r2Y;
        this.K3.col1.y = -invI2 * r2X * r2Y;
        this.K3.col2.y = invI2 * r2X * r2X;
        this.K.SetM(this.K1);
        this.K.AddM(this.K2);
        this.K.AddM(this.K3);
        this.K.Solve(b2RevoluteJoint.tImpulse, -CX, -CY);
        impulseX = b2RevoluteJoint.tImpulse.x;
        impulseY = b2RevoluteJoint.tImpulse.y;
        bA.m_sweep.c.x -= bA.m_invMass * impulseX;
        bA.m_sweep.c.y -= bA.m_invMass * impulseY;
        bA.m_sweep.a -= bA.m_invI * (r1X * impulseY - r1Y * impulseX);
        bB.m_sweep.c.x += bB.m_invMass * impulseX;
        bB.m_sweep.c.y += bB.m_invMass * impulseY;
        bB.m_sweep.a += bB.m_invI * (r2X * impulseY - r2Y * impulseX);
        bA.SynchronizeTransform();
        bB.SynchronizeTransform();
      }
      return (
        positionError <= b2Settings.b2_linearSlop &&
        angularError <= b2Settings.b2_angularSlop
      );
    };
    Box2D.postDefs.push(function () {
      Box2D.Dynamics.Joints.b2RevoluteJoint.tImpulse = new b2Vec2();
    });
    Box2D.inherit(b2RevoluteJointDef, Box2D.Dynamics.Joints.b2JointDef);
    b2RevoluteJointDef.prototype.__super =
      Box2D.Dynamics.Joints.b2JointDef.prototype;
    b2RevoluteJointDef.b2RevoluteJointDef = function () {
      Box2D.Dynamics.Joints.b2JointDef.b2JointDef.apply(this, arguments);
      this.localAnchorA = new b2Vec2();
      this.localAnchorB = new b2Vec2();
    };
    b2RevoluteJointDef.prototype.b2RevoluteJointDef = function () {
      this.__super.b2JointDef.call(this);
      this.type = b2Joint.e_revoluteJoint;
      this.localAnchorA.Set(0.0, 0.0);
      this.localAnchorB.Set(0.0, 0.0);
      this.referenceAngle = 0.0;
      this.lowerAngle = 0.0;
      this.upperAngle = 0.0;
      this.maxMotorTorque = 0.0;
      this.motorSpeed = 0.0;
      this.enableLimit = false;
      this.enableMotor = false;
    };
    b2RevoluteJointDef.prototype.Initialize = function (bA, bB, anchor) {
      this.bodyA = bA;
      this.bodyB = bB;
      this.localAnchorA = this.bodyA.GetLocalPoint(anchor);
      this.localAnchorB = this.bodyB.GetLocalPoint(anchor);
      this.referenceAngle = this.bodyB.GetAngle() - this.bodyA.GetAngle();
    };
    Box2D.inherit(b2WeldJoint, Box2D.Dynamics.Joints.b2Joint);
    b2WeldJoint.prototype.__super = Box2D.Dynamics.Joints.b2Joint.prototype;
    b2WeldJoint.b2WeldJoint = function () {
      Box2D.Dynamics.Joints.b2Joint.b2Joint.apply(this, arguments);
      this.m_localAnchorA = new b2Vec2();
      this.m_localAnchorB = new b2Vec2();
      this.m_impulse = new b2Vec3();
      this.m_mass = new b2Mat33();
    };
    b2WeldJoint.prototype.GetAnchorA = function () {
      return this.m_bodyA.GetWorldPoint(this.m_localAnchorA);
    };
    b2WeldJoint.prototype.GetAnchorB = function () {
      return this.m_bodyB.GetWorldPoint(this.m_localAnchorB);
    };
    b2WeldJoint.prototype.GetReactionForce = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return new b2Vec2(inv_dt * this.m_impulse.x, inv_dt * this.m_impulse.y);
    };
    b2WeldJoint.prototype.GetReactionTorque = function (inv_dt) {
      if (inv_dt === undefined) inv_dt = 0;
      return inv_dt * this.m_impulse.z;
    };
    b2WeldJoint.prototype.b2WeldJoint = function (def) {
      this.__super.b2Joint.call(this, def);
      this.m_localAnchorA.SetV(def.localAnchorA);
      this.m_localAnchorB.SetV(def.localAnchorB);
      this.m_referenceAngle = def.referenceAngle;
      this.m_impulse.SetZero();
      this.m_mass = new b2Mat33();
    };
    b2WeldJoint.prototype.InitVelocityConstraints = function (step) {
      var tMat;
      var tX = 0;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      tMat = bA.m_xf.R;
      var rAX = this.m_localAnchorA.x - bA.m_sweep.localCenter.x;
      var rAY = this.m_localAnchorA.y - bA.m_sweep.localCenter.y;
      tX = tMat.col1.x * rAX + tMat.col2.x * rAY;
      rAY = tMat.col1.y * rAX + tMat.col2.y * rAY;
      rAX = tX;
      tMat = bB.m_xf.R;
      var rBX = this.m_localAnchorB.x - bB.m_sweep.localCenter.x;
      var rBY = this.m_localAnchorB.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * rBX + tMat.col2.x * rBY;
      rBY = tMat.col1.y * rBX + tMat.col2.y * rBY;
      rBX = tX;
      var mA = bA.m_invMass;
      var mB = bB.m_invMass;
      var iA = bA.m_invI;
      var iB = bB.m_invI;
      this.m_mass.col1.x = mA + mB + rAY * rAY * iA + rBY * rBY * iB;
      this.m_mass.col2.x = -rAY * rAX * iA - rBY * rBX * iB;
      this.m_mass.col3.x = -rAY * iA - rBY * iB;
      this.m_mass.col1.y = this.m_mass.col2.x;
      this.m_mass.col2.y = mA + mB + rAX * rAX * iA + rBX * rBX * iB;
      this.m_mass.col3.y = rAX * iA + rBX * iB;
      this.m_mass.col1.z = this.m_mass.col3.x;
      this.m_mass.col2.z = this.m_mass.col3.y;
      this.m_mass.col3.z = iA + iB;
      if (step.warmStarting) {
        this.m_impulse.x *= step.dtRatio;
        this.m_impulse.y *= step.dtRatio;
        this.m_impulse.z *= step.dtRatio;
        bA.m_linearVelocity.x -= mA * this.m_impulse.x;
        bA.m_linearVelocity.y -= mA * this.m_impulse.y;
        bA.m_angularVelocity -=
          iA *
          (rAX * this.m_impulse.y - rAY * this.m_impulse.x + this.m_impulse.z);
        bB.m_linearVelocity.x += mB * this.m_impulse.x;
        bB.m_linearVelocity.y += mB * this.m_impulse.y;
        bB.m_angularVelocity +=
          iB *
          (rBX * this.m_impulse.y - rBY * this.m_impulse.x + this.m_impulse.z);
      } else {
        this.m_impulse.SetZero();
      }
    };
    b2WeldJoint.prototype.SolveVelocityConstraints = function (step) {
      var tMat;
      var tX = 0;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      var vA = bA.m_linearVelocity;
      var wA = bA.m_angularVelocity;
      var vB = bB.m_linearVelocity;
      var wB = bB.m_angularVelocity;
      var mA = bA.m_invMass;
      var mB = bB.m_invMass;
      var iA = bA.m_invI;
      var iB = bB.m_invI;
      tMat = bA.m_xf.R;
      var rAX = this.m_localAnchorA.x - bA.m_sweep.localCenter.x;
      var rAY = this.m_localAnchorA.y - bA.m_sweep.localCenter.y;
      tX = tMat.col1.x * rAX + tMat.col2.x * rAY;
      rAY = tMat.col1.y * rAX + tMat.col2.y * rAY;
      rAX = tX;
      tMat = bB.m_xf.R;
      var rBX = this.m_localAnchorB.x - bB.m_sweep.localCenter.x;
      var rBY = this.m_localAnchorB.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * rBX + tMat.col2.x * rBY;
      rBY = tMat.col1.y * rBX + tMat.col2.y * rBY;
      rBX = tX;
      var Cdot1X = vB.x - wB * rBY - vA.x + wA * rAY;
      var Cdot1Y = vB.y + wB * rBX - vA.y - wA * rAX;
      var Cdot2 = wB - wA;
      var impulse = new b2Vec3();
      this.m_mass.Solve33(impulse, -Cdot1X, -Cdot1Y, -Cdot2);
      this.m_impulse.Add(impulse);
      vA.x -= mA * impulse.x;
      vA.y -= mA * impulse.y;
      wA -= iA * (rAX * impulse.y - rAY * impulse.x + impulse.z);
      vB.x += mB * impulse.x;
      vB.y += mB * impulse.y;
      wB += iB * (rBX * impulse.y - rBY * impulse.x + impulse.z);
      bA.m_angularVelocity = wA;
      bB.m_angularVelocity = wB;
    };
    b2WeldJoint.prototype.SolvePositionConstraints = function (baumgarte) {
      if (baumgarte === undefined) baumgarte = 0;
      var tMat;
      var tX = 0;
      var bA = this.m_bodyA;
      var bB = this.m_bodyB;
      tMat = bA.m_xf.R;
      var rAX = this.m_localAnchorA.x - bA.m_sweep.localCenter.x;
      var rAY = this.m_localAnchorA.y - bA.m_sweep.localCenter.y;
      tX = tMat.col1.x * rAX + tMat.col2.x * rAY;
      rAY = tMat.col1.y * rAX + tMat.col2.y * rAY;
      rAX = tX;
      tMat = bB.m_xf.R;
      var rBX = this.m_localAnchorB.x - bB.m_sweep.localCenter.x;
      var rBY = this.m_localAnchorB.y - bB.m_sweep.localCenter.y;
      tX = tMat.col1.x * rBX + tMat.col2.x * rBY;
      rBY = tMat.col1.y * rBX + tMat.col2.y * rBY;
      rBX = tX;
      var mA = bA.m_invMass;
      var mB = bB.m_invMass;
      var iA = bA.m_invI;
      var iB = bB.m_invI;
      var C1X = bB.m_sweep.c.x + rBX - bA.m_sweep.c.x - rAX;
      var C1Y = bB.m_sweep.c.y + rBY - bA.m_sweep.c.y - rAY;
      var C2 = bB.m_sweep.a - bA.m_sweep.a - this.m_referenceAngle;
      var k_allowedStretch = 10.0 * b2Settings.b2_linearSlop;
      var positionError = Math.sqrt(C1X * C1X + C1Y * C1Y);
      var angularError = b2Math.Abs(C2);
      if (positionError > k_allowedStretch) {
        iA *= 1.0;
        iB *= 1.0;
      }
      this.m_mass.col1.x = mA + mB + rAY * rAY * iA + rBY * rBY * iB;
      this.m_mass.col2.x = -rAY * rAX * iA - rBY * rBX * iB;
      this.m_mass.col3.x = -rAY * iA - rBY * iB;
      this.m_mass.col1.y = this.m_mass.col2.x;
      this.m_mass.col2.y = mA + mB + rAX * rAX * iA + rBX * rBX * iB;
      this.m_mass.col3.y = rAX * iA + rBX * iB;
      this.m_mass.col1.z = this.m_mass.col3.x;
      this.m_mass.col2.z = this.m_mass.col3.y;
      this.m_mass.col3.z = iA + iB;
      var impulse = new b2Vec3();
      this.m_mass.Solve33(impulse, -C1X, -C1Y, -C2);
      bA.m_sweep.c.x -= mA * impulse.x;
      bA.m_sweep.c.y -= mA * impulse.y;
      bA.m_sweep.a -= iA * (rAX * impulse.y - rAY * impulse.x + impulse.z);
      bB.m_sweep.c.x += mB * impulse.x;
      bB.m_sweep.c.y += mB * impulse.y;
      bB.m_sweep.a += iB * (rBX * impulse.y - rBY * impulse.x + impulse.z);
      bA.SynchronizeTransform();
      bB.SynchronizeTransform();
      return (
        positionError <= b2Settings.b2_linearSlop &&
        angularError <= b2Settings.b2_angularSlop
      );
    };
    Box2D.inherit(b2WeldJointDef, Box2D.Dynamics.Joints.b2JointDef);
    b2WeldJointDef.prototype.__super =
      Box2D.Dynamics.Joints.b2JointDef.prototype;
    b2WeldJointDef.b2WeldJointDef = function () {
      Box2D.Dynamics.Joints.b2JointDef.b2JointDef.apply(this, arguments);
      this.localAnchorA = new b2Vec2();
      this.localAnchorB = new b2Vec2();
    };
    b2WeldJointDef.prototype.b2WeldJointDef = function () {
      this.__super.b2JointDef.call(this);
      this.type = b2Joint.e_weldJoint;
      this.referenceAngle = 0.0;
    };
    b2WeldJointDef.prototype.Initialize = function (bA, bB, anchor) {
      this.bodyA = bA;
      this.bodyB = bB;
      this.localAnchorA.SetV(this.bodyA.GetLocalPoint(anchor));
      this.localAnchorB.SetV(this.bodyB.GetLocalPoint(anchor));
      this.referenceAngle = this.bodyB.GetAngle() - this.bodyA.GetAngle();
    };
  })();
  (function () {
    var b2DebugDraw = Box2D.Dynamics.b2DebugDraw;
    b2DebugDraw.b2DebugDraw = function () {
      this.m_drawScale = 1.0;
      this.m_lineThickness = 1.0;
      this.m_alpha = 1.0;
      this.m_fillAlpha = 1.0;
      this.m_xformScale = 1.0;
      var __this = this;
      //#WORKAROUND
      this.m_sprite = {
        graphics: {
          clear: function () {
            __this.m_ctx.clearRect(
              0,
              0,
              __this.m_ctx.canvas.width,
              __this.m_ctx.canvas.height
            );
          },
        },
      };
    };
    b2DebugDraw.prototype._color = function (color, alpha) {
      return (
        "rgba(" +
        ((color & 0xff0000) >> 16) +
        "," +
        ((color & 0xff00) >> 8) +
        "," +
        (color & 0xff) +
        "," +
        alpha +
        ")"
      );
    };
    b2DebugDraw.prototype.b2DebugDraw = function () {
      this.m_drawFlags = 0;
    };
    b2DebugDraw.prototype.SetFlags = function (flags) {
      if (flags === undefined) flags = 0;
      this.m_drawFlags = flags;
    };
    b2DebugDraw.prototype.GetFlags = function () {
      return this.m_drawFlags;
    };
    b2DebugDraw.prototype.AppendFlags = function (flags) {
      if (flags === undefined) flags = 0;
      this.m_drawFlags |= flags;
    };
    b2DebugDraw.prototype.ClearFlags = function (flags) {
      if (flags === undefined) flags = 0;
      this.m_drawFlags &= ~flags;
    };
    b2DebugDraw.prototype.SetSprite = function (sprite) {
      this.m_ctx = sprite;
    };
    b2DebugDraw.prototype.GetSprite = function () {
      return this.m_ctx;
    };
    b2DebugDraw.prototype.SetDrawScale = function (drawScale) {
      if (drawScale === undefined) drawScale = 0;
      this.m_drawScale = drawScale;
    };
    b2DebugDraw.prototype.GetDrawScale = function () {
      return this.m_drawScale;
    };
    b2DebugDraw.prototype.SetLineThickness = function (lineThickness) {
      if (lineThickness === undefined) lineThickness = 0;
      this.m_lineThickness = lineThickness;
      this.m_ctx.strokeWidth = lineThickness;
    };
    b2DebugDraw.prototype.GetLineThickness = function () {
      return this.m_lineThickness;
    };
    b2DebugDraw.prototype.SetAlpha = function (alpha) {
      if (alpha === undefined) alpha = 0;
      this.m_alpha = alpha;
    };
    b2DebugDraw.prototype.GetAlpha = function () {
      return this.m_alpha;
    };
    b2DebugDraw.prototype.SetFillAlpha = function (alpha) {
      if (alpha === undefined) alpha = 0;
      this.m_fillAlpha = alpha;
    };
    b2DebugDraw.prototype.GetFillAlpha = function () {
      return this.m_fillAlpha;
    };
    b2DebugDraw.prototype.SetXFormScale = function (xformScale) {
      if (xformScale === undefined) xformScale = 0;
      this.m_xformScale = xformScale;
    };
    b2DebugDraw.prototype.GetXFormScale = function () {
      return this.m_xformScale;
    };
    b2DebugDraw.prototype.DrawPolygon = function (
      vertices,
      vertexCount,
      color
    ) {
      if (!vertexCount) return;
      var s = this.m_ctx;
      var drawScale = this.m_drawScale;
      s.beginPath();
      s.strokeStyle = this._color(color.color, this.m_alpha);
      s.moveTo(vertices[0].x * drawScale, vertices[0].y * drawScale);
      for (var i = 1; i < vertexCount; i++) {
        s.lineTo(vertices[i].x * drawScale, vertices[i].y * drawScale);
      }
      s.lineTo(vertices[0].x * drawScale, vertices[0].y * drawScale);
      s.closePath();
      s.stroke();
    };
    b2DebugDraw.prototype.DrawSolidPolygon = function (
      vertices,
      vertexCount,
      color
    ) {
      if (!vertexCount) return;
      var s = this.m_ctx;
      var drawScale = this.m_drawScale;
      s.beginPath();
      s.strokeStyle = this._color(color.color, this.m_alpha);
      s.fillStyle = this._color(color.color, this.m_fillAlpha);
      s.moveTo(vertices[0].x * drawScale, vertices[0].y * drawScale);
      for (var i = 1; i < vertexCount; i++) {
        s.lineTo(vertices[i].x * drawScale, vertices[i].y * drawScale);
      }
      s.lineTo(vertices[0].x * drawScale, vertices[0].y * drawScale);
      s.closePath();
      s.fill();
      s.stroke();
    };
    b2DebugDraw.prototype.DrawCircle = function (center, radius, color) {
      if (!radius) return;
      var s = this.m_ctx;
      var drawScale = this.m_drawScale;
      s.beginPath();
      s.strokeStyle = this._color(color.color, this.m_alpha);
      s.arc(
        center.x * drawScale,
        center.y * drawScale,
        radius * drawScale,
        0,
        Math.PI * 2,
        true
      );
      s.closePath();
      s.stroke();
    };
    b2DebugDraw.prototype.DrawSolidCircle = function (
      center,
      radius,
      axis,
      color
    ) {
      if (!radius) return;
      var s = this.m_ctx,
        drawScale = this.m_drawScale,
        cx = center.x * drawScale,
        cy = center.y * drawScale;
      s.moveTo(0, 0);
      s.beginPath();
      s.strokeStyle = this._color(color.color, this.m_alpha);
      s.fillStyle = this._color(color.color, this.m_fillAlpha);
      s.arc(cx, cy, radius * drawScale, 0, Math.PI * 2, true);
      s.moveTo(cx, cy);
      s.lineTo(
        (center.x + axis.x * radius) * drawScale,
        (center.y + axis.y * radius) * drawScale
      );
      s.closePath();
      s.fill();
      s.stroke();
    };
    b2DebugDraw.prototype.DrawSegment = function (p1, p2, color) {
      var s = this.m_ctx,
        drawScale = this.m_drawScale;
      s.strokeStyle = this._color(color.color, this.m_alpha);
      s.beginPath();
      s.moveTo(p1.x * drawScale, p1.y * drawScale);
      s.lineTo(p2.x * drawScale, p2.y * drawScale);
      s.closePath();
      s.stroke();
    };
    b2DebugDraw.prototype.DrawTransform = function (xf) {
      var s = this.m_ctx,
        drawScale = this.m_drawScale;
      s.beginPath();
      s.strokeStyle = this._color(0xff0000, this.m_alpha);
      s.moveTo(xf.position.x * drawScale, xf.position.y * drawScale);
      s.lineTo(
        (xf.position.x + this.m_xformScale * xf.R.col1.x) * drawScale,
        (xf.position.y + this.m_xformScale * xf.R.col1.y) * drawScale
      );

      s.strokeStyle = this._color(0xff00, this.m_alpha);
      s.moveTo(xf.position.x * drawScale, xf.position.y * drawScale);
      s.lineTo(
        (xf.position.x + this.m_xformScale * xf.R.col2.x) * drawScale,
        (xf.position.y + this.m_xformScale * xf.R.col2.y) * drawScale
      );
      s.closePath();
      s.stroke();
    };
  })();
  var i;
  for (i = 0; i < Box2D.postDefs.length; ++i) Box2D.postDefs[i]();

  const ArgumentType = Scratch.ArgumentType;
  const BlockType = Scratch.BlockType;
  // const MathUtil = require('../../util/math-util');
  // const Clone = require('../../util/clone');
  const Cast = {
    toNumber: (n) => +n || 0,
  };
  // const Cast = require('../../util/cast');
  // const Runtime = require('../../engine/runtime');
  // const RenderedTarget = require('../../sprites/rendered-target');
  // const MathUtil = require('../../util/math-util');
  // const Timer = require('../../util/timer');
  // const Matter = require('matterJs/matter');
  // const Matter = require('matter-js');
  const ROTATION_STYLE_ALL_AROUND = "all around";

  // const Box2D = require('./Box2d.min').box2d;

  // window.decomp = require('poly-decomp');

  const b2World = Box2D.Dynamics.b2World;
  const b2Vec2 = Box2D.Common.Math.b2Vec2;
  const b2AABB = Box2D.Collision.b2AABB;
  const b2BodyDef = Box2D.Dynamics.b2BodyDef;
  const b2Body = Box2D.Dynamics.b2Body;
  const b2FixtureDef = Box2D.Dynamics.b2FixtureDef;
  // const b2Fixture = Box2D.Dynamics.b2Fixture;
  // const b2Fixture = Box2D.Dynamics.b2Fixture;
  const b2Contact = Box2D.Dynamics.Contacts.b2Contact;
  // const b2MassData = Box2D.Collision.Shapes.b2MassData;
  const b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape;
  const b2CircleShape = Box2D.Collision.Shapes.b2CircleShape;
  // const b2DebugDraw = Box2D.Dynamics.b2DebugDraw;
  const b2MouseJointDef = Box2D.Dynamics.Joints.b2MouseJointDef;
  const b2Math = Box2D.Common.Math.b2Math;

  let world;
  let zoom;

  const fixDef = new b2FixtureDef();
  const bodyDef = new b2BodyDef();

  // const uid_seq = 0;
  // let ujidSeq = 0;

  const prevPos = {};
  /**
   * Active b2Body/s in the world.
   * @type {Object.<string,*>}
   */
  const bodies = {};
  // const joints = {};
  const pinned = {}; // Map of IDs to pinned joints
  /**
   * The runtime instantiating this block package.
   * @type {Array}
   */
  const stageBodies = [];

  // const categorySeq = 1;
  // const categories = {default: 1};

  const bodyCategoryBits = 1;
  const bodyMaskBits = 1;
  // const noCollideSeq = 0;

  const toRad = Math.PI / 180;

  // Used to record the scroll position of all sprites
  const _scroll = new b2Vec2(0, 0);

  const STAGE_TYPE_OPTIONS = {
    BOXED: "boxed",
    FLOOR: "floor",
    OPEN: "open",
  };

  const SPACE_TYPE_OPTIONS = {
    WORLD: "world",
    STAGE: "stage",
    RELATIVE: "relative",
  };

  const WHERE_TYPE_OPTIONS = {
    ANY: "any",
    FEET: "feet",
  };

  const SHAPE_TYPE_OPTIONS = {
    COSTUME: "costume",
    CIRCLE: "circle",
    SVG_POLYGON: "svg",
    ALL: "all",
  };

  const _definePolyFromHull = function (hullPoints) {
    fixDef.shape = new b2PolygonShape();

    const vertices = [];

    let prev = null;
    for (let i = hullPoints.length - 1; i >= 0; i--) {
      // for (let i = 0; i < hullPoints.length; i++) {
      const b2Vec = new b2Vec2(hullPoints[i].x / zoom, hullPoints[i].y / zoom);
      if (
        prev !== null &&
        b2Math.SubtractVV(b2Vec, prev).LengthSquared() > Number.MIN_VALUE
      ) {
        vertices.push(b2Vec);
      }
      prev = b2Vec;
    }

    fixDef.shape.SetAsArray(vertices);
  };

  const _placeBody = function (id, x, y, dir) {
    if (bodies[id]) {
      world.DestroyBody(bodies[id]);
    }

    fixDef.filter.categoryBits = bodyCategoryBits;
    fixDef.filter.maskBits = bodyMaskBits;

    bodyDef.position.x = (x + _scroll.x) / zoom;
    bodyDef.position.y = (y + _scroll.y) / zoom;
    bodyDef.angle = (90 - dir) * toRad;

    const body = world.CreateBody(bodyDef);
    body.uid = id;
    body.CreateFixture(fixDef);
    bodies[id] = body;
    return body;
  };

  const _removeBody = function (id) {
    if (!bodies[id]) return;

    world.DestroyBody(bodies[id]);
    delete bodies[id];
    delete prevPos[id];
  };

  const _applyForce = function (id, ftype, x, y, dir, pow) {
    const body = bodies[id];
    if (!body) {
      return;
    }

    dir = (90 - dir) * toRad;

    if (ftype === "Impulse") {
      const center = body.GetLocalCenter(); // get the mass data from you body

      body.ApplyImpulse(
        { x: pow * Math.cos(dir), y: pow * Math.sin(dir) },
        body.GetWorldPoint({ x: x / zoom + center.x, y: y / zoom + center.y })
      );
    } else if (ftype === "World Impulse") {
      body.ApplyForce(
        { x: pow * Math.cos(dir), y: pow * Math.sin(dir) },
        { x: x / zoom, y: y / zoom }
      );
    }
  };

  // ['', 'Define Spring Length: %n Damping: %n  Freq: %n', '_defineSpring', 100, 0.5, 8],
  const defSpring = { len: 100, damp: 0.7, freq: 5 };
  const _defineSpring = function (len, damp, freq) {
    defSpring.len = len < 0.1 ? 0.1 : len / zoom;
    defSpring.damp = damp < 0 ? 0.7 : damp;
    defSpring.freq = freq > 0 ? freq : 5;
  };

  const _createJointOfType = function (
    jName,
    typ,
    bodyID,
    x,
    y,
    bodyID2,
    x2,
    y2
  ) {
    // if (jName.length > 0) ext.destroyJoint(jName);

    if (!bodyID) bodyID = null;
    if (!bodyID2) bodyID2 = null;
    if (!bodyID && !bodyID2) {
      return null;
    }

    const body = bodyID ? bodies[bodyID] : world.GetGroundBody();
    const body2 = bodyID2 ? bodies[bodyID2] : world.GetGroundBody();

    if (!body || !body2) return null;

    let md;
    switch (typ) {
      case "Spring":
        md = new Box2D.Dynamics.Joints.b2DistanceJointDef();
        md.length = defSpring.len;
        md.dampingRatio = defSpring.damp;
        md.frequencyHz = defSpring.freq;
        md.bodyA = body;
        md.bodyB = body2;
        md.localAnchorA = { x: x / zoom, y: y / zoom };
        md.localAnchorB = { x: x2 / zoom, y: y2 / zoom };
        break;

      case "Rotating":
        md = new Box2D.Dynamics.Joints.b2RevoluteJointDef();
        md.bodyA = body;
        md.bodyB = body2;
        md.localAnchorA = { x: x / zoom, y: y / zoom };
        if (x2 === null) {
          if (body2) {
            md.localAnchorB = body2.GetLocalPoint(body.GetPosition()); // Wheel Type Joint...
          } else {
            md.localAnchorB = body.GetWorldPoint({ x: x / zoom, y: y / zoom });
          }
        } else {
          md.localAnchorB = { x: x2 / zoom, y: y2 / zoom };
        }
        break;

      case "Mouse":
        md = new b2MouseJointDef();
        if (bodyID) {
          md.bodyB = body;
          md.target.Set(x / zoom, y / zoom);
        } else {
          md.bodyB = body2;
          md.target.Set(x2 / zoom, y2 / zoom);
        }
        md.bodyA = world.GetGroundBody();
        md.collideConnected = true;
        md.maxForce = 300.0 * body.GetMass();
        break;
    }

    // md.collideConnected = true;
    // md.maxForce = 300.0 * body.GetMass();
    const joint = world.CreateJoint(md);
    if (bodyID) {
      body.SetAwake(true);
    }
    if (bodyID2) {
      body2.SetAwake(true);
    }

    // if (!jName) {
    //     ujidSeq++;
    //     jName = `_${ujidSeq}`;
    // }
    // joints[jName] = joint;
    return joint;
  };

  /**
   * Set the X and Y coordinates (No Fencing)
   * @param {!RenderedTarget} rt the renderedTarget.
   * @param {!number} x New X coordinate, in Scratch coordinates.
   * @param {!number} y New Y coordinate, in Scratch coordinates.
   * @param {?boolean} force Force setting X/Y, in case of dragging
   */
  const _setXY = function (rt, x, y, force) {
    if (rt.isStage) return;
    if (rt.dragging && !force) return;
    const oldX = rt.x;
    const oldY = rt.y;
    if (rt.renderer) {
      // const position = rt.renderer.getFencedPositionOfDrawable(rt.drawableID, [x, y]);
      rt.x = x; // position[0];
      rt.y = y; // position[1];

      rt.renderer.updateDrawableProperties(rt.drawableID, {
        position: [x, y],
      });
      if (rt.visible) {
        rt.emit("EVENT_TARGET_VISUAL_CHANGE", rt);
        rt.runtime.requestRedraw();
      }
    } else {
      rt.x = x;
      rt.y = y;
    }
    rt.emit("EVENT_TARGET_MOVED", rt, oldX, oldY, force);
    rt.runtime.requestTargetsUpdate(rt);
  };

  const createStageBody = function () {
    const body = world.CreateBody(bodyDef);
    body.CreateFixture(fixDef);
    stageBodies.push(body);
  };

  const _setStageType = function (type) {
    // Clear down previous stage
    if (stageBodies.length > 0) {
      for (const stageBodyID in stageBodies) {
        world.DestroyBody(stageBodies[stageBodyID]);
        delete stageBodies[stageBodyID];
      }
    }

    // Build up new stage
    bodyDef.type = b2Body.b2_staticBody;
    fixDef.shape = new b2PolygonShape();
    bodyDef.angle = 0;

    const { stageWidth, stageHeight } = Scratch.vm.runtime;
    const stageBounds = {
      left: -stageWidth / 2,
      right: stageWidth / 2,
      top: stageHeight / 2,
      bottom: -stageHeight / 2,
    };

    if (type === STAGE_TYPE_OPTIONS.BOXED) {
      // For the ceiling boxes...
      // use a width equivalent to the stage width + 10, with a thickness of 10
      fixDef.shape.SetAsBox((stageWidth + 10) / zoom, 10 / zoom);
      // create one such box at the bottom of the stage, accounting for thickness...
      bodyDef.position.Set(0, (stageBounds.bottom - 10) / zoom);
      createStageBody();
      // and one 820 units above the top of the stage.
      bodyDef.position.Set(0, (stageBounds.top + 820) / zoom);
      createStageBody();
      // For the left & right wall boxes...
      // use a height equivalent to the stage height + 820, with a thickness of 10
      fixDef.shape.SetAsBox(10 / zoom, (stageHeight + 820) / zoom);
      // create a box at the left of the stage...
      bodyDef.position.Set((stageBounds.left - 10) / zoom, 0);
      createStageBody();
      // and one at the right of the stage.
      bodyDef.position.Set((stageBounds.right + 10) / zoom, 0);
      createStageBody();
    } else if (type === STAGE_TYPE_OPTIONS.FLOOR) {
      // All floor boxes are positioned at the bottom of the stage, accounting for
      // the thickness of 100.
      const floorY = (stageBounds.bottom - 100) / zoom;

      // The floor boxes have a width of the stage width + 4520 units, and a
      // thickness of 100 units.
      fixDef.shape.SetAsBox((stageWidth + 4520) / zoom, 100 / zoom);
      // Floor boxes are created at different intervals throughout the bottom of the stage.
      bodyDef.position.Set(0, floorY);
      createStageBody();
      bodyDef.position.Set(stageBounds.left - 5000, floorY);
      createStageBody();
      bodyDef.position.Set(stageBounds.right + 5000, floorY);
      createStageBody();
      bodyDef.position.Set(stageBounds.left - 15000, floorY);
      createStageBody();
      bodyDef.position.Set(stageBounds.right + 15000, floorY);
      createStageBody();
    }

    bodyDef.type = b2Body.b2_dynamicBody;

    for (const bodyID in bodies) {
      bodies[bodyID].SetAwake(true);
    }
  };

  /* eslint-enable */

  let tickRate = 30;

  const blockIconURI =
    "data:image/svg+xml;base64,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";
  const menuIconURI =
    "data:image/svg+xml;base64,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";
  const vm = Scratch.vm;

  class Scratch3Griffpatch {
    constructor() {
      /**
       * The runtime instantiating this block package.
       * @type {Runtime}
       */
      this.runtime = vm.runtime;

      // Clear target motion state values when the project starts.
      this.runtime.on("PROJECT_START", this.reset.bind(this));

      world = new b2World(
        new b2Vec2(0, -10), // gravity (10)
        true // allow sleep
      );

      zoom = 50; // scale;

      this.map = {};

      fixDef.density = 1.0; // 1.0
      fixDef.friction = 0.5; // 0.5
      fixDef.restitution = 0.2; // 0.2

      _setStageType(STAGE_TYPE_OPTIONS.BOXED);
    }

    reset() {
      for (const body in bodies) {
        if (pinned[body.uid]) {
          world.DestroyJoint(pinned[body.uid]);
          delete pinned[body.uid];
        }
        world.DestroyBody(bodies[body]);
        delete bodies[body];
        delete prevPos[body];
      }
      tickRate = 30;
      // todo: delete joins?
    }

    /**
     * The key to load & store a target's music-related state.
     * @type {string}
     */
    static get STATE_KEY() {
      return "Scratch.Griffpatch";
    }

    /**
     * @returns {object} metadata for this extension and its blocks.
     */
    getInfo() {
      return {
        id: "griffpatch",
        name: Scratch.translate({
          id: "griffpatch.categoryName",
          default: "Physics",
          description: "Label for the Griffpatch extension category",
        }),
        docsURI: "https://extensions.turbowarp.org/box2d",
        menuIconURI: menuIconURI,
        blockIconURI: blockIconURI,
        blocks: [
          // Global Setup ------------------

          {
            opcode: "setStage",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setStage",
              default: "set stage boundaries to [stageType]",
              description: "Set the stage type",
            }),
            arguments: {
              stageType: {
                type: ArgumentType.STRING,
                menu: "StageTypes",
                defaultValue: STAGE_TYPE_OPTIONS.BOXED,
              },
            },
          },
          {
            opcode: "setGravity",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setGravity",
              default: "set gravity to x: [gx] y: [gy]",
              description: "Set the gravity",
            }),
            arguments: {
              gx: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
              gy: {
                type: ArgumentType.NUMBER,
                defaultValue: -10,
              },
            },
          },
          {
            opcode: "getGravityX",
            blockType: BlockType.REPORTER,
            text: Scratch.translate({
              id: "griffpatch.getGravityX",
              default: "gravity x",
              description: "Get the gravity's x value",
            }),
          },
          {
            opcode: "getGravityY",
            blockType: BlockType.REPORTER,
            text: Scratch.translate({
              id: "griffpatch.getGravityY",
              default: "gravity y",
              description: "Get the gravity's y value",
            }),
          },

          "---",

          {
            opcode: "setPhysics",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setPhysics",
              default: "enable for [shape] mode [mode]",
              description: "Enable Physics for this Sprite",
            }),
            arguments: {
              shape: {
                type: ArgumentType.STRING,
                menu: "ShapeTypes",
                defaultValue: "costume",
              },
              mode: {
                type: ArgumentType.STRING,
                menu: "EnableModeTypes",
                defaultValue: "normal",
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "disablePhysics",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.disablePhysics",
              default: "disable physics for this sprite",
              description: "Disable Physics for this Sprite",
            }),
            arguments: {},
            filter: [Scratch.TargetType.SPRITE],
          },
          // {
          //     opcode: 'setPhysics',
          //     blockType: BlockType.COMMAND,
          //     text: Scratch.translate({
          //         id: 'griffpatch.setPhysics',
          //         default: 'enable physics for sprite [shape]',
          //         description: 'Enable Physics for this Sprite'
          //     }),
          //     arguments: {
          //         shape: {
          //             type: ArgumentType.STRING,
          //             menu: 'ShapeTypes',
          //             defaultValue: 'costume'
          //         }
          //     }
          // },
          // {
          //     opcode: 'setPhysicsAll',
          //     blockType: BlockType.COMMAND,
          //     text: Scratch.translate({
          //         id: 'griffpatch.setPhysicsAll',
          //         default: 'enable physics for all sprites',
          //         description: 'Enable Physics For All Sprites'
          //     })
          // },
          //
          "---",

          {
            opcode: "doTick",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.doTick",
              default: "step simulation",
              description: "Run a single tick of the physics simulation",
            }),
          },
          {
            opcode: "setTickRate",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setTickRate",
              default: "set simulation rate to [rate]/s",
              description:
                "Set the number of physics simulation steps to run per second",
            }),
            arguments: {
              rate: {
                type: ArgumentType.NUMBER,
                defaultValue: 30,
              },
            },
          },
          {
            opcode: "getTickRate",
            blockType: BlockType.REPORTER,
            text: Scratch.translate({
              id: "griffpatch.getTickRate",
              default: "simulation rate",
              description:
                "Get the number of physics simulation steps to run per second",
            }),
          },

          "---",

          {
            opcode: "setPosition",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setPosition",
              default: "go to x: [x] y: [y] [space]",
              description: "Position Sprite",
            }),
            arguments: {
              x: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
              y: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
              space: {
                type: ArgumentType.STRING,
                menu: "SpaceTypes",
                defaultValue: "world",
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },

          "---",

          // applyForce (target, ftype, x, y, dir, pow) {
          // applyAngForce (target, pow) {

          {
            opcode: "setVelocity",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setVelocity",
              default: "set velocity to sx: [sx] sy: [sy]",
              description: "Set Velocity",
            }),
            arguments: {
              sx: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
              sy: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "changeVelocity",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.changeVelocity",
              default: "change velocity by sx: [sx] sy: [sy]",
              description: "Change Velocity",
            }),
            arguments: {
              sx: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
              sy: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "getVelocityX",
            text: Scratch.translate({
              id: "griffpatch.getVelocityX",
              default: "x velocity",
              description: "get the x velocity",
            }),
            blockType: BlockType.REPORTER,
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "getVelocityY",
            text: Scratch.translate({
              id: "griffpatch.getVelocityY",
              default: "y velocity",
              description: "get the y velocity",
            }),
            blockType: BlockType.REPORTER,
            filter: [Scratch.TargetType.SPRITE],
          },

          "---",

          {
            opcode: "applyForce",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.applyForce",
              default: "push with force [force] in direction [dir]",
              description: "Push this object in a given direction",
            }),
            arguments: {
              force: {
                type: ArgumentType.NUMBER,
                defaultValue: 25,
              },
              dir: {
                type: ArgumentType.ANGLE,
                defaultValue: 0,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "applyAngForce",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.applyAngForce",
              default: "spin with force [force]",
              description: "Push this object in a given direction",
            }),
            arguments: {
              force: {
                type: ArgumentType.NUMBER,
                defaultValue: 500,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },

          "---",

          {
            opcode: "setAngVelocity",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setAngVelocity",
              default: "set angular velocity to [force]",
              description: "Set the angular velocity of the sprite",
            }),
            arguments: {
              force: {
                type: ArgumentType.NUMBER,
                defaultValue: 30,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "getAngVelocity",
            blockType: BlockType.REPORTER,
            text: Scratch.translate({
              id: "griffpatch.getAngVelocity",
              default: "angular velocity",
              description: "Get the angular velocity of the sprite",
            }),
            filter: [Scratch.TargetType.SPRITE],
          },

          "---",

          {
            opcode: "setStatic",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setStatic",
              default: "set fixed to [static]",
              description: "Sets whether this block is static or dynamic",
            }),
            arguments: {
              static: {
                type: ArgumentType.STRING,
                menu: "StaticTypes",
                defaultValue: "static",
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "getStatic",
            text: Scratch.translate({
              id: "griffpatch.getStatic",
              default: "fixed?",
              description: "get whether this sprite is fixed",
            }),
            blockType: BlockType.BOOLEAN,
            filter: [Scratch.TargetType.SPRITE],
            disableMonitor: true,
          },

          "---",

          {
            opcode: "setDensity",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setDensity",
              default: "set density to [density]",
              description: "Set the density of the object",
            }),
            arguments: {
              density: {
                type: ArgumentType.NUMBER,
                menu: "DensityTypes",
                defaultValue: 100,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "setDensityValue",
            func: "setDensity",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setDensityValue",
              default: "set density to [density]",
              description: "Set the density of the object",
            }),
            arguments: {
              density: {
                type: ArgumentType.NUMBER,
                defaultValue: 100,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "getDensity",
            blockType: BlockType.REPORTER,
            text: Scratch.translate({
              id: "griffpatch.getDensity",
              default: "density",
              description: "Get the density of the object",
            }),
            filter: [Scratch.TargetType.SPRITE],
          },

          "---",

          {
            opcode: "setFriction",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setFriction",
              default: "set friction to [friction]",
              description: "Set the friction of the object",
            }),
            arguments: {
              friction: {
                type: ArgumentType.NUMBER,
                menu: "FrictionTypes",
                defaultValue: 50,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "setFrictionValue",
            func: "setFriction",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setFrictionValue",
              default: "set friction to [friction]",
              description: "Set the friction value of the object",
            }),
            arguments: {
              friction: {
                type: ArgumentType.NUMBER,
                defaultValue: 50,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "getFriction",
            blockType: BlockType.REPORTER,
            text: Scratch.translate({
              id: "griffpatch.getFriction",
              default: "friction",
              description: "Get the friction of the object",
            }),
            filter: [Scratch.TargetType.SPRITE],
          },

          "---",

          {
            opcode: "setRestitution",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setRestitution",
              default: "set bounce to [restitution]",
              description: "Set the bounce of the object",
            }),
            arguments: {
              restitution: {
                type: ArgumentType.NUMBER,
                menu: "RestitutionTypes",
                defaultValue: 20,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "setRestitutionValue",
            func: "setRestitution",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setRestitutionValue",
              default: "set bounce to [restitution]",
              description: "Set the bounce value of the object",
            }),
            arguments: {
              restitution: {
                type: ArgumentType.NUMBER,
                defaultValue: 20,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },
          {
            opcode: "getRestitution",
            blockType: BlockType.REPORTER,
            text: Scratch.translate({
              id: "griffpatch.getRestitution",
              default: "bounce",
              description: "Get the bounce value of the object",
            }),
            filter: [Scratch.TargetType.SPRITE],
          },

          "---",

          {
            opcode: "setProperties",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setProperties",
              default:
                "set density [density] roughness [friction] bounce [restitution]",
              description: "Set the density of the object",
            }),
            arguments: {
              density: {
                type: ArgumentType.NUMBER,
                menu: "DensityTypes",
                defaultValue: 100,
              },
              friction: {
                type: ArgumentType.NUMBER,
                menu: "FrictionTypes",
                defaultValue: 50,
              },
              restitution: {
                type: ArgumentType.NUMBER,
                menu: "RestitutionTypes",
                defaultValue: 20,
              },
            },
            filter: [Scratch.TargetType.SPRITE],
            hideFromPalette: true,
          },
          // {
          //     opcode: 'pinSprite',
          //     blockType: BlockType.COMMAND,
          //     text: Scratch.translate({
          //         id: 'griffpatch.pinSprite',
          //         default: 'pin to world at sprite\'s x: [x] y: [y]',
          //         description: 'Pin the sprite'
          //     }),
          //     arguments: {
          //         x: {
          //             type: ArgumentType.NUMBER,
          //             defaultValue: 0
          //         },
          //         y: {
          //             type: ArgumentType.NUMBER,
          //             defaultValue: 0
          //         }
          //     }
          // },

          "---",

          {
            opcode: "getTouching",
            text: Scratch.translate({
              id: "griffpatch.getTouching",
              default: "list sprites touching [where]",
              description: "get the name of any sprites we are touching",
            }),
            blockType: BlockType.REPORTER,
            arguments: {
              where: {
                type: ArgumentType.STRING,
                menu: "WhereTypes",
                defaultValue: "any",
              },
            },
            filter: [Scratch.TargetType.SPRITE],
          },

          // Scene Scrolling -------------------

          "---",

          {
            opcode: "setScroll",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.setScroll",
              default: "set scroll to x: [ox] y: [oy]",
              description: "Sets whether this block is static or dynamic",
            }),
            arguments: {
              ox: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
              oy: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
            },
          },
          {
            opcode: "changeScroll",
            blockType: BlockType.COMMAND,
            text: Scratch.translate({
              id: "griffpatch.changeScroll",
              default: "change scroll by x: [ox] y: [oy]",
              description: "Sets whether this block is static or dynamic",
            }),
            arguments: {
              ox: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
              oy: {
                type: ArgumentType.NUMBER,
                defaultValue: 0,
              },
            },
          },
          {
            opcode: "getScrollX",
            text: Scratch.translate({
              id: "griffpatch.getScrollX",
              default: "x scroll",
              description: "get the x scroll",
            }),
            blockType: BlockType.REPORTER,
          },
          {
            opcode: "getScrollY",
            text: Scratch.translate({
              id: "griffpatch.getScrollY",
              default: "y scroll",
              description: "get the y scroll",
            }),
            blockType: BlockType.REPORTER,
          },
        ],

        menus: {
          StageTypes: this.STAGE_TYPE_MENU,
          SpaceTypes: this.SPACE_TYPE_MENU,
          WhereTypes: this.WHERE_TYPE_MENU,
          ShapeTypes: this.SHAPE_TYPE_MENU,
          EnableModeTypes: this.ENABLE_TYPES_TYPE_MENU,
          StaticTypes: this.STATIC_TYPE_MENU,
          FrictionTypes: this.FRICTION_TYPE_MENU,
          RestitutionTypes: this.RESTITUTION_TYPE_MENU,
          DensityTypes: this.DENSITY_TYPE_MENU,
        },
      };
    }

    get STAGE_TYPE_MENU() {
      return [
        { text: "boxed stage", value: STAGE_TYPE_OPTIONS.BOXED },
        { text: "open (with floor)", value: STAGE_TYPE_OPTIONS.FLOOR },
        { text: "open (no floor)", value: STAGE_TYPE_OPTIONS.OPEN },
      ];
    }

    get SPACE_TYPE_MENU() {
      return [
        { text: "in world", value: SPACE_TYPE_OPTIONS.WORLD },
        { text: "on stage", value: SPACE_TYPE_OPTIONS.STAGE },
        { text: "relative", value: SPACE_TYPE_OPTIONS.RELATIVE },
      ];
    }

    get WHERE_TYPE_MENU() {
      return [
        { text: "any", value: WHERE_TYPE_OPTIONS.ANY },
        { text: "feet", value: WHERE_TYPE_OPTIONS.FEET },
      ];
    }

    get SHAPE_TYPE_MENU() {
      return [
        { text: "this costume", value: SHAPE_TYPE_OPTIONS.COSTUME },
        { text: "this circle", value: SHAPE_TYPE_OPTIONS.CIRCLE },
        // { text: "this polygon", value: SHAPE_TYPE_OPTIONS.SVG_POLYGON },
        { text: "all sprites", value: SHAPE_TYPE_OPTIONS.ALL },
      ];
    }

    get ENABLE_TYPES_TYPE_MENU() {
      return [
        { text: "normal", value: "normal" },
        { text: "precision", value: "bullet" },
      ];
    }

    get STATIC_TYPE_MENU() {
      return [
        { text: "free", value: "dynamic" },
        { text: "fixed in place", value: "static" },
        { text: "fixed (but can rotate)", value: "pinned" },
      ];
    }

    get DENSITY_TYPE_MENU() {
      return [
        { text: "very light", value: "25" },
        { text: "light", value: "50" },
        { text: "normal", value: "100" },
        { text: "heavy", value: "200" },
        { text: "very heavy", value: "400" },
      ];
    }

    get FRICTION_TYPE_MENU() {
      return [
        { text: "none", value: "0" },
        { text: "smooth", value: "20" },
        { text: "normal", value: "50" },
        { text: "rough", value: "75" },
        { text: "extremely rough", value: "100" },
      ];
    }

    get RESTITUTION_TYPE_MENU() {
      return [
        { text: "none", value: "0" },
        { text: "little", value: "10" },
        { text: "normal", value: "20" },
        { text: "quite bouncy", value: "40" },
        { text: "very bouncy", value: "70" },
        { text: "unstable", value: "100" },
      ];
    }

    /**
     * Play a drum sound for some number of beats.
     * @property {number} x - x offset.
     * @property {number} y - y offset.
     */
    doTick() {
      // args, util) {
      // this._playDrumForBeats(args.DRUM, args.BEATS, util);
      // if (util.runtime.audioEngine === null) return;
      // if (util.target.sprite.soundBank === null) return;

      // const dx = Cast.toNumber(args.x);
      // const dy = Cast.toNumber(args.y);

      // const allTargets = this.runtime.targets;
      // if (allTargets === null) return;
      // for (let i = 0; i < allTargets.length; i++) {
      //     const target = allTargets[i];
      //     if (!target.isStage) {
      //         target.setXY(target.x + dx, target.y + dy);
      //     }
      // }

      // util.target.setXY(util.target.x + dx, util.target.y + dy);

      // Matter.Engine.update(this.engine, 1000 / 30);
      this._checkMoved();

      // world.Step(1 / 30, 10, 10);
      world.Step(1 / tickRate, 10, 10);
      world.ClearForces();

      for (const targetID in bodies) {
        const body = bodies[targetID];
        const target = this.runtime.getTargetById(targetID);
        if (!target) {
          // Drop target from simulation
          world.DestroyBody(body);
          delete bodies[targetID];
          delete prevPos[targetID];
          continue;
        }

        const position = body.GetPosition();

        _setXY(
          target,
          position.x * zoom - _scroll.x,
          position.y * zoom - _scroll.y
        );
        if (target.rotationStyle === ROTATION_STYLE_ALL_AROUND) {
          target.setDirection(90 - body.GetAngle() / toRad);
        }

        prevPos[targetID] = { x: target.x, y: target.y, dir: target.direction };
      }
    }

    setTickRate(args) {
      let rate = Scratch.Cast.toNumber(args.rate);
      if (Number.isNaN(rate) || rate === Infinity) rate = 30;
      rate = Math.max(rate, 0.01);

      tickRate = rate;
    }

    getTickRate() {
      return tickRate;
    }

    _checkMoved() {
      for (const targetID in bodies) {
        const body = bodies[targetID];
        const target = this.runtime.getTargetById(targetID);
        if (!target) {
          // Drop target from simulation
          world.DestroyBody(body);
          delete bodies[targetID];
          delete prevPos[targetID];
          continue;
        }

        const prev = prevPos[targetID];
        const fixedRotation =
          target.rotationStyle !== ROTATION_STYLE_ALL_AROUND;

        if (prev && (prev.x !== target.x || prev.y !== target.y)) {
          const pos = new b2Vec2(
            (target.x + _scroll.x) / zoom,
            (target.y + _scroll.y) / zoom
          );
          this._setPosition(body, pos);
          if (!fixedRotation) {
            body.SetAngle((90 - target.direction) * toRad);
          }
          body.SetAwake(true);
        } else if (!fixedRotation && prev && prev.dir !== target.direction) {
          body.SetAngle((90 - target.direction) * toRad);
          body.SetAwake(true);
        }
      }
    }

    /**
     * Play a drum sound for some number of beats.
     * @property {number} x - x offset.
     * @property {number} y - y offset.
     */
    setPhysicsAll() {
      const allTargets = this.runtime.targets;
      if (allTargets === null) return;
      for (let i = 0; i < allTargets.length; i++) {
        const target = allTargets[i];
        if (!target.isStage && !bodies[target.id]) {
          this.setPhysicsFor(target);
        }
      }
    }

    /**
     * Play a drum sound for some number of beats.
     * @param {object} args - the block arguments.
     * @param {object} util - utility object provided by the runtime.
     * @property {string} shape - the shape
     */
    setPhysics(args, util) {
      // this._playDrumForBeats(args.DRUM, args.BEATS, util);
      // if (util.runtime.audioEngine === null) return;
      // if (util.target.sprite.soundBank === null) return;

      // const dx = Cast.toNumber(args.x);
      // const dy = Cast.toNumber(args.y);

      if (args.shape === SHAPE_TYPE_OPTIONS.ALL) {
        this.setPhysicsAll();
        return;
      }

      const target = util.target;
      const body = this.setPhysicsFor(target, args.shape);
      if (body) {
        body.SetBullet(args.mode === "bullet");
      }
    }

    setPhysicsFor(target, shape) {
      const r = this.runtime.renderer;
      const drawable = r._allDrawables[target.drawableID];

      // Tell the Drawable about its updated convex hullPoints, if necessary.
      if (drawable.needsConvexHullPoints()) {
        const points = r._getConvexHullPointsForDrawable(target.drawableID);
        drawable.setConvexHullPoints(points);
      }

      // if (drawable._transformDirty) {
      //     drawable._calculateTransform();
      // }
      // const points = drawable._getTransformedHullPoints();
      //
      // const hullPoints = [];
      // for (const i in points) {
      //     hullPoints.push({x: points[i][0] - target.x, y: points[i][1] - target.y});
      // }

      const points = drawable._convexHullPoints;
      const scaleX = drawable.scale[0] / 100;
      const scaleY = drawable.scale[1] / -100; // Flip Y for hulls
      const offset = drawable.skin.rotationCenter;
      let allHulls = null;

      if (shape === SHAPE_TYPE_OPTIONS.CIRCLE) {
        fixDef.shape = new b2CircleShape();
        const size = drawable.skin.size;
        fixDef.shape.SetRadius(
          (size[0] * Math.abs(scaleX) + size[1] * Math.abs(scaleY)) / 4.0 / zoom
        );
        // fixDef.shape.SetRadius((drawable.getBounds().width / 2) / zoom);
      } else if (shape === SHAPE_TYPE_OPTIONS.SVG_POLYGON) {
        const svg = drawable._skin._svgRenderer._svgTag;

        // recurse through childNodes of type 'g', looking for type 'path'

        const hullPoints = [];
        if (svg) {
          this._fetchPolygonPointsFromSVG(
            svg,
            hullPoints,
            offset[0],
            offset[1],
            scaleX,
            scaleY
          );
        }

        _definePolyFromHull(hullPoints[0]);
        allHulls = hullPoints;
      } else {
        const hullPoints = [];
        for (const i in points) {
          hullPoints.push({
            x: (points[i][0] - offset[0]) * scaleX,
            y: (points[i][1] - offset[1]) * scaleY,
          });
        }

        _definePolyFromHull(hullPoints);
      }

      const fixedRotation = target.rotationStyle !== ROTATION_STYLE_ALL_AROUND;
      const body = _placeBody(
        target.id,
        target.x,
        target.y,
        fixedRotation ? 90 : target.direction
      );
      if (target.rotationStyle !== ROTATION_STYLE_ALL_AROUND) {
        body.SetFixedRotation(true);
      }

      if (allHulls) {
        for (let i = 1; i < allHulls.length; i++) {
          _definePolyFromHull(allHulls[i]);
          body.CreateFixture(fixDef);
        }
      }

      return body;
    }

    disablePhysics(args, util) {
      _removeBody(util.target.id);
    }

    /**
     *
     * @param svg the svg element
     * @param {Array} hullPointsList array of points
     * @private
     */
    _fetchPolygonPointsFromSVG(svg, hullPointsList, ox, oy, scaleX, scaleY) {
      if (svg.tagName === "g" || svg.tagName === "svg") {
        if (svg.hasChildNodes()) {
          for (const node of svg.childNodes) {
            this._fetchPolygonPointsFromSVG(
              node,
              hullPointsList,
              ox,
              oy,
              scaleX,
              scaleY
            );
          }
        }
        return;
      }

      if (svg.tagName !== "path") {
        return;
      }
      // This is it boys! Get that svg data :)
      // <path xmlns="http://www.w3.org/2000/svg" d="M 1 109.7118 L 1 1.8097 L 60.3049 38.0516 L 117.9625 1.8097 L 117.9625 109.7118 L 59.8931 73.8817 Z "
      //  data-paper-data="{&quot;origPos&quot;:null}" stroke-width="2" fill="#9966ff"/>

      let fx;
      let fy;

      const hullPoints = [];
      hullPointsList.push(hullPoints);

      const tokens = svg.getAttribute("d").split(" ");
      for (let i = 0; i < tokens.length; ) {
        const token = tokens[i++];
        if (token === "M" || token === "L") {
          const x = Cast.toNumber(tokens[i++]);
          const y = Cast.toNumber(tokens[i++]);
          hullPoints.push({ x: (x - ox) * scaleX, y: (y - oy) * scaleY });
          if (token === "M") {
            fx = x;
            fy = y;
          }
        }
        if (token === "Z") {
          hullPoints.push({ x: (fx - ox) * scaleX, y: (fy - oy) * scaleY });
        }
      }
    }

    applyForce(args, util) {
      _applyForce(
        util.target.id,
        "Impulse",
        0,
        0,
        Cast.toNumber(args.dir),
        Cast.toNumber(args.force)
      );
    }

    applyAngForce(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }

      body.ApplyTorque(-Cast.toNumber(args.force));
    }

    setAngVelocity(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }
      body.SetAngularVelocity(-Cast.toNumber(args.force));
    }

    getAngVelocity(args, util) {
      const body = bodies[util.target.id];
      if (!body) {
        return 0;
      }
      const vel = -body.GetAngularVelocity();
      return vel;
    }

    setDensity(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }

      body.GetFixtureList().SetDensity(Cast.toNumber(args.density) / 100.0);
      body.ResetMassData();
    }

    getDensity(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }

      return body.GetFixtureList().GetDensity() * 100;
    }

    setFriction(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }

      body.GetFixtureList().SetFriction(Cast.toNumber(args.friction) / 100.0);
      body.ResetMassData();
    }

    getFriction(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }

      return body.GetFixtureList().GetFriction() * 100;
    }

    setRestitution(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }

      body
        .GetFixtureList()
        .SetRestitution(Cast.toNumber(args.restitution) / 100.0);
      body.ResetMassData();
    }

    getRestitution(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }

      return body.GetFixtureList().GetRestitution() * 100;
    }

    setProperties(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }

      body.GetFixtureList().SetDensity(Cast.toNumber(args.density) / 100.0);
      body.GetFixtureList().SetFriction(Cast.toNumber(args.friction) / 100.0);
      body
        .GetFixtureList()
        .SetRestitution(Cast.toNumber(args.restitution) / 100.0);
      body.ResetMassData();
    }

    pinSprite(args, util) {
      if (!bodies[util.target.id]) {
        this.setPhysicsFor(util.target);
      }

      const x = Cast.toNumber(args.x);
      const y = Cast.toNumber(args.y);

      _createJointOfType(
        null,
        "Rotating",
        util.target.id,
        x,
        y,
        null,
        null,
        null
      );
    }

    /**
     * Set's the sprites position.
     * @param {object} args - the block arguments.
     * @param {object} util - utility object provided by the runtime.
     * @property {number} x - x offset.
     * @property {number} y - y offset.
     * @property {string} space - Space type (SPACE_TYPE_OPTIONS)
     */
    setPosition(args, util) {
      const x = Cast.toNumber(args.x);
      const y = Cast.toNumber(args.y);
      const body = bodies[util.target.id];

      switch (args.space) {
        case SPACE_TYPE_OPTIONS.STAGE:
          _setXY(util.target, x, y); // Position on stage (after scroll)
          if (body) {
            this._setPosition(
              body,
              new b2Vec2((x + _scroll.x) / zoom, (y + _scroll.y) / zoom)
            );
          }
          break;
        case SPACE_TYPE_OPTIONS.RELATIVE: {
          _setXY(util.target, util.target.x + x, util.target.x + y);
          if (body) {
            const pos = body.GetPosition();
            const pos2 = new b2Vec2(pos.x + x / zoom, pos.y + y / zoom);
            this._setPosition(body, pos2);
          }
          break;
        }
        default:
          _setXY(util.target, x - _scroll.x, y - _scroll.y);
          if (body) {
            this._setPosition(body, new b2Vec2(x / zoom, y / zoom));
          }
      }
    }

    _setPosition(body, pos2) {
      const md = pinned[body.uid];
      if (md) {
        world.DestroyJoint(md);
        pinned[body.uid] = _createJointOfType(
          null,
          "Rotating",
          body.uid,
          0,
          0,
          null,
          pos2.x * zoom,
          pos2.y * zoom
        );
      }
      body.SetPosition(pos2);
      // if (md) {
      //     pinned[body.uid] = _createJointOfType(null, 'Rotating', body.uid, 0, 0, null, null, null);
      // }
    }

    /**
     * Set the sprites velocity.
     * @param {object} args - the block arguments.
     * @param {object} util - utility object provided by the runtime.
     * @property {number} sx - speed x.
     * @property {number} sy - speed y.
     */
    setVelocity(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }

      body.SetAwake(true);

      const x = Cast.toNumber(args.sx);
      const y = Cast.toNumber(args.sy);
      const force = new b2Vec2(x, y);
      force.Multiply(30 / zoom);
      body.SetLinearVelocity(force);
    }

    /**
     * Change the sprites velocity.
     * @param {object} args - the block arguments.
     * @param {object} util - utility object provided by the runtime.
     * @property {number} sx - speed x.
     * @property {number} sy - speed y.
     */
    changeVelocity(args, util) {
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(util.target);
      }

      body.SetAwake(true);

      const x = Cast.toNumber(args.sx);
      const y = Cast.toNumber(args.sy);
      const force = new b2Vec2(x, y);
      force.Multiply(30 / zoom);
      force.Add(body.GetLinearVelocity());
      body.SetLinearVelocity(force);
    }

    /**
     * Get the current tempo.
     * @param {object} args - the block arguments.
     * @param {object} util - utility object provided by the runtime.
     * @return {boolean} - the current tempo, in beats per minute.
     */
    getStatic(args, util) {
      const body = bodies[util.target.id];
      if (!body) {
        return false;
      }
      const type = body.GetType();
      return type === b2Body.b2_staticBody;
    }

    /**
     * Get the current tempo.
     * @param {object} args - the block arguments.
     * @param {object} util - utility object provided by the runtime.
     * @return {number} - the current x velocity.
     */
    getVelocityX(args, util) {
      const body = bodies[util.target.id];
      if (!body) {
        return 0;
      }
      const x = body.GetLinearVelocity().x;
      return (x * zoom) / 30;
    }

    /**
     * Get the current tempo.
     * @param {object} args - the block arguments.
     * @param {object} util - utility object provided by the runtime.
     * @return {boolean} - the current y velocity.
     */
    getVelocityY(args, util) {
      const body = bodies[util.target.id];
      if (!body) {
        return 0;
      }
      const y = body.GetLinearVelocity().y;
      return (y * zoom) / 30;
    }

    /**
     * Sets the static property
     * @param {object} args - the block arguments.
     * @param {object} util - utility object provided by the runtime.
     * @property {string} static - static or not
     */
    setStatic(args, util) {
      const target = util.target;
      let body = bodies[util.target.id];
      if (!body) {
        body = this.setPhysicsFor(target);
      }
      body.SetType(
        args.static === "static" ? b2Body.b2_staticBody : b2Body.b2_dynamicBody
      );

      const pos = new b2Vec2(
        (target.x + _scroll.x) / zoom,
        (target.y + _scroll.y) / zoom
      );
      const fixedRotation = target.rotationStyle !== ROTATION_STYLE_ALL_AROUND;
      body.SetPositionAndAngle(
        pos,
        fixedRotation ? 0 : (90 - target.direction) * toRad
      );

      if (args.static === "pinned") {
        // Find what's behind the sprite (pin to that)
        const point = new b2AABB();
        point.lowerBound.SetV(pos);
        point.upperBound.SetV(pos);
        let body2ID = null;
        world.QueryAABB((fixture) => {
          const body2 = fixture.GetBody();
          if (body2 !== body && fixture.TestPoint(pos.x, pos.y)) {
            body2ID = body2.uid;
            return false;
          }
          return true;
        }, point);

        pinned[target.id] = _createJointOfType(
          null,
          "Rotating",
          target.id,
          0,
          0,
          body2ID,
          null,
          null
        );
      } else {
        const pin = pinned[target.id];
        if (pin) {
          world.DestroyJoint(pin);
          // delete joints[pin.I];
          delete pinned[target.id];
        }
      }
    }

    /**
     * Sets the sprite offset
     * @param {object} args - the block arguments.
     * @property {number} ox - x offset.
     * @property {number} oy - y offset.
     */
    setScroll(args) {
      this._checkMoved();
      _scroll.x = Cast.toNumber(args.ox);
      _scroll.y = Cast.toNumber(args.oy);
      this._repositionBodies();
    }

    /**
     * Sets the sprite offset
     * @param {object} args - the block arguments.
     * @property {number} ox - x offset.
     * @property {number} oy - y offset.
     */
    changeScroll(args) {
      this._checkMoved();
      _scroll.x += Cast.toNumber(args.ox);
      _scroll.y += Cast.toNumber(args.oy);
      this._repositionBodies();
    }

    /**
     * Get the scroll x.
     * @return {number} - the current x velocity.
     */
    getScrollX() {
      return _scroll.x;
    }

    /**
     * Get the scroll x.
     * @return {number} - the current x velocity.
     */
    getScrollY() {
      return _scroll.y;
    }

    _repositionBodies() {
      for (const targetID in bodies) {
        const body = bodies[targetID];
        const target = this.runtime.getTargetById(targetID);
        if (target) {
          const position = body.GetPosition();
          _setXY(
            target,
            position.x * zoom - _scroll.x,
            position.y * zoom - _scroll.y
          );
          prevPos[targetID] = {
            x: target.x,
            y: target.y,
            dir: target.direction,
          };
        }
      }
    }

    getTouching(args, util) {
      const target = util.target;
      const body = bodies[target.id];
      if (!body) {
        return "";
      }
      const where = args.where;
      let touching = "";
      const contacts = body.GetContactList();
      for (let ce = contacts; ce; ce = ce.next) {
        // noinspection JSBitwiseOperatorUsage
        if (ce.contact.m_flags & b2Contact.e_islandFlag) {
          continue;
        }
        if (
          ce.contact.IsSensor() === true ||
          ce.contact.IsEnabled() === false ||
          ce.contact.IsTouching() === false
        ) {
          continue;
        }
        const contact = ce.contact;
        const fixtureA = contact.GetFixtureA();
        const fixtureB = contact.GetFixtureB();
        const bodyA = fixtureA.GetBody();
        const bodyB = fixtureB.GetBody();

        // const myFix = touchingB ? fixtureA : fixtureB;

        const touchingB = bodyA === body;
        if (where !== "any") {
          const man = new Box2D.Collision.b2WorldManifold();
          contact.GetWorldManifold(man);
          // man.m_points
          // const mx = man.m_normal.x;
          // const my = man.m_normal.y;

          if (where === "feet") {
            // if (my > -0.6) {
            //     continue;
            // }

            const fixture = body.GetFixtureList();
            const y = man.m_points[0].y;
            if (
              y >
              fixture.m_aabb.lowerBound.y * 0.75 +
                fixture.m_aabb.upperBound.y * 0.25
            ) {
              continue;
            }

            // const lp = body.GetLocalPoint(man.m_points[0]).Normalize();
            // if (lp.y)
          }
        }

        const other = touchingB ? bodyB : bodyA;
        const uid = other.uid;
        const target2 = uid
          ? this.runtime.getTargetById(uid)
          : this.runtime.getTargetForStage();
        if (target2) {
          const name = target2.sprite.name;
          if (touching.length === 0) {
            touching = name;
          } else {
            touching += `,${name}`;
          }
        }
      }
      return touching;
    }

    /**
     * Sets the stage
     * @param {object} args - the block arguments.
     * @property {number} stageType - Stage Type.
     */
    setStage(args) {
      _setStageType(args.stageType);
    }

    /**
     * Sets the gravity
     * @param {object} args - the block arguments.
     * @property {number} gx - Gravity x.
     * @property {number} gy - Gravity y.
     */
    setGravity(args) {
      world.SetGravity(
        new b2Vec2(Cast.toNumber(args.gx), Cast.toNumber(args.gy))
      );
      for (const bodyID in bodies) {
        bodies[bodyID].SetAwake(true);
      }
    }

    getGravityX() {
      return world.GetGravity().x;
    }

    getGravityY() {
      return world.GetGravity().y;
    }
  }

  Scratch.extensions.register(new Scratch3Griffpatch());
})(Scratch);