ExMath.cs

/**
 * Misc math utils and extra functionality.
 *   
 * Author: Ronen Ness.
 * Since: 2017. 
*/
using UnityEngine;
using System.Collections;

namespace NesScripts.Misc
{
    /// <summary>
    /// Extra math utilities.
    /// </summary>
    public class ExMath
    {
        /// <summary>
        /// Get angle between two points, without Y axis.
        /// </summary>
        /// <param name="from">First point.</param>
        /// <param name="to">Second point.</param>
        /// <returns>Angle between points.</returns>
        public static float AngleXZ(Vector3 from, Vector3 to)
        {
            Vector2 p1 = new Vector2(from.x, from.z);
            Vector2 p2 = new Vector2(to.x, to.z);
            return Angle(p1, p2);
        }

        /// <summary>
        /// Get angle between two 2d points.
        /// </summary>
        /// <param name="p1">First point.</param>
        /// <param name="p2">Second point.</param>
        /// <returns>Angle between points.</returns>
        public static float Angle(Vector2 p1, Vector2 p2)
        {
            return Mathf.Atan2(p2.y - p1.y, p2.x - p1.x) * 180 / Mathf.PI;
        }

        /// <summary>
        /// Get avarage between two angles.
        /// Note: this also represent the angle directly between two other angles.
        /// </summary>
        /// <returns>Avarage value between two angles.</returns>
        public float AnglesAvg(float a, float b)
        {
            return Mathf.LerpAngle(a, b, 0.5f);
        }
    }
}