gregloryus.github.io/binary-plants-1.html at master · gregloryus/gregloryus.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Binary Plants</title>
<style>
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: #000000; overflow: hidden; font-family: 'Courier New', monospace; }
canvas { display: block; }

#status {
  position: fixed;
  top: 8px; left: 0; right: 0;
  text-align: center;
  color: #555;
  font-size: 11px;
  letter-spacing: 1px;
  pointer-events: none;
}

#ui {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 72px;
  display: flex;
  align-items: stretch;
  background: rgba(5,5,5,0.92);
  border-top: 1px solid #1a1a1a;
}

#btn0 {
  flex: 1;
  font-size: 26px; font-weight: bold;
  border: none; border-right: 1px solid #111;
  background: #0b1e3a;
  color: #3a82ff;
  cursor: pointer;
  letter-spacing: 4px;
  transition: background 0.08s;
}
#btn1 {
  flex: 1;
  font-size: 26px; font-weight: bold;
  border: none;
  background: #2a0e0e;
  color: #ff4422;
  cursor: pointer;
  letter-spacing: 4px;
  transition: background 0.08s;
}
#btn0:hover:not(:disabled) { background: #122a52; }
#btn1:hover:not(:disabled) { background: #3d1414; }
#btn0:active:not(:disabled) { background: #1a3f7a; }
#btn1:active:not(:disabled) { background: #501e1e; }
#btn0:disabled, #btn1:disabled { opacity: 0.12; cursor: default; }

#urn-mid {
  width: 72px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex-shrink: 0;
  border-right: 1px solid #111;
  border-left: 1px solid #111;
}
#urn-bar {
  width: 48px; height: 8px;
  border-radius: 4px;
  background: #111;
  overflow: hidden;
}
#urn-fill0 { height: 100%; background: #3a82ff; float: left; }
#urn-fill1 { height: 100%; background: #ff4422; float: left; }
#urn-label { font-size: 9px; color: #444; letter-spacing: 1px; }

#hint {
  position: fixed;
  bottom: 80px; left: 0; right: 0;
  text-align: center;
  font-size: 10px; color: #333;
  letter-spacing: 1px;
  pointer-events: none;
}
</style>
</head>
<body>
<canvas id="c"></canvas>
<div id="status">sculpting...</div>
<div id="hint">← 0 / 1 →  &nbsp;|&nbsp;  arrow keys work too</div>
<div id="ui">
  <button id="btn0">0</button>
  <div id="urn-mid">
    <div id="urn-bar"><div id="urn-fill0" style="width:50%"></div><div id="urn-fill1" style="width:50%"></div></div>
    <div id="urn-label">1:1</div>
  </div>
  <button id="btn1">1</button>
</div>

<script>
// ═══════════════════════════════════════════════════════
//  BINARY PLANTS  ·  binary-plants-1.html
//  Fork of urn-plants. User sculpts one ancestor plant
//  (0 = don't grow, 1 = grow), then releases it into a
//  shared world where offspring grow, disperse, and
//  compete autonomously following inherited urn genes.
// ═══════════════════════════════════════════════════════

const canvas   = document.getElementById('c');
const ctx      = canvas.getContext('2d');
const statusEl = document.getElementById('status');
const hintEl   = document.getElementById('hint');
const btn0     = document.getElementById('btn0');
const btn1     = document.getElementById('btn1');
const urnFill0 = document.getElementById('urn-fill0');
const urnFill1 = document.getElementById('urn-fill1');
const urnLabel = document.getElementById('urn-label');

const UI_H = 72;
function resize() {
  canvas.width  = window.innerWidth;
  canvas.height = window.innerHeight - UI_H;
}
resize();
window.addEventListener('resize', resize);

// ─── CONSTANTS ───────────────────────────────────────
const MARGIN        = 5;    // viewport padding (cells) around bounding box
const MIN_VIEW      = 28;   // minimum cell span for viewport
const CELL_MAX_PX   = 30;
const CELL_MIN_PX   = 1;
const LEARNING      = 100;   // urn copies added per decision (reinforcement)
const MUTATION_RATE = 0.00; // probability each gene value flips on inheritance
const MAX_DEPTH     = 9;    // maximum growth depth per plant
const LIFESPAN      = 90;   // ticks a plant lives after reaching maturity
const DISPERSE_STEPS = 22;  // steps a seed walks before attempting to land
const SEARCH_STEPS   = 18;  // additional search steps if landing blocked
const CLEARANCE      = 1;   // cell radius that must be clear for seed to land


const TICK_MS        = 10;  // milliseconds per simulation tick

// ─── DIRECTIONS ──────────────────────────────────────
const DELTA = {
  up:    { dx:  0, dy: -1 },
  right: { dx:  1, dy:  0 },
  down:  { dx:  0, dy:  1 },
  left:  { dx: -1, dy:  0 },
};
const REL_TO_ABS = {
  up:    { left: 'left',  forward: 'up',    right: 'right' },
  right: { left: 'up',   forward: 'right', right: 'down'  },
  down:  { left: 'right', forward: 'down',  right: 'left'  },
  left:  { left: 'down', forward: 'left',  right: 'up'    },
};
const DIRS4 = ['up', 'right', 'down', 'left'];
const RELS  = ['left', 'forward', 'right'];

// ─── SPATIAL INDEX ───────────────────────────────────
// Flat map for O(1) point queries; quadtree for range/radius queries.
class QTNode {
  constructor(x, y, w, h, depth = 0) {
    this.x = x; this.y = y; this.w = w; this.h = h; this.depth = depth;
    this.items = []; // { x, y, data }
    this.kids  = null;
  }
  contains(x, y) {
    return x >= this.x && x < this.x + this.w && y >= this.y && y < this.y + this.h;
  }
  overlaps(x1, y1, x2, y2) {
    return !(x2 < this.x || x1 >= this.x + this.w || y2 < this.y || y1 >= this.y + this.h);
  }
  split() {
    const hw = this.w / 2, hh = this.h / 2;
    this.kids = [
      new QTNode(this.x,      this.y,      hw, hh, this.depth + 1),
      new QTNode(this.x + hw, this.y,      hw, hh, this.depth + 1),
      new QTNode(this.x,      this.y + hh, hw, hh, this.depth + 1),
      new QTNode(this.x + hw, this.y + hh, hw, hh, this.depth + 1),
    ];
    for (const p of this.items)
      for (const k of this.kids)
        if (k.contains(p.x, p.y)) k.items.push(p);
    this.items = [];
  }
  insert(x, y, data) {
    if (!this.contains(x, y)) return;
    if (this.kids) { for (const k of this.kids) k.insert(x, y, data); return; }
    this.items.push({ x, y, data });
    if (this.items.length > 10 && this.depth < 12) this.split();
  }
  remove(x, y) {
    if (!this.contains(x, y)) return;
    if (this.kids) { for (const k of this.kids) k.remove(x, y); return; }
    this.items = this.items.filter(p => !(p.x === x && p.y === y));
  }
  query(x1, y1, x2, y2, out) {
    if (!this.overlaps(x1, y1, x2, y2)) return;
    if (this.kids) { for (const k of this.kids) k.query(x1, y1, x2, y2, out); return; }
    for (const p of this.items)
      if (p.x >= x1 && p.x <= x2 && p.y >= y1 && p.y <= y2) out.push(p.data);
  }
}

class SpatialIndex {
  constructor() {
    this.map = new Map();                                 // "x,y" → data
    this.qt  = new QTNode(-32768, -32768, 65536, 65536); // world-space quadtree
  }
  skey(x, y) { return x + ',' + y; }
  insert(x, y, data) { this.map.set(this.skey(x, y), data); this.qt.insert(x, y, data); }
  remove(x, y)       { this.map.delete(this.skey(x, y)); this.qt.remove(x, y); }
  has(x, y)          { return this.map.has(this.skey(x, y)); }
  get(x, y)          { return this.map.get(this.skey(x, y)); }
  near(x, y, r)      { const out = []; this.qt.query(x - r, y - r, x + r, y + r, out); return out; }
  hasNearOther(x, y, r, excludePlantId) {
    const items = this.near(x, y, r);
    for (const item of items)
      if (item.plantId !== excludePlantId) return true;
    return false;
  }
}

const world = new SpatialIndex(); // global occupancy

// ─── GENE BANK ───────────────────────────────────────
const DEFAULT_URN = [0, 0, 0, 1]; // unexplored junctions are 3:1 against growing

class GeneBank {
  constructor(src = null) {
    this.map = new Map();
    if (src) {
      // Inherit parent urns with per-value mutation
      for (const [k, v] of src.map)
        this.map.set(k, v.map(x => Math.random() < MUTATION_RATE ? 1 - x : x));
    }
  }
  preview(key) { return this.map.has(key) ? this.map.get(key).slice() : DEFAULT_URN.slice(); }
  sample(key) {
    const pool = this.map.get(key) || DEFAULT_URN;
    return pool[Math.floor(Math.random() * pool.length)];
  }
  append(key, val) {
    let arr = this.map.get(key);
    if (!arr) { arr = DEFAULT_URN.slice(); this.map.set(key, arr); }
    for (let i = 0; i < LEARNING; i++) arr.push(val);
  }
}

// ─── CELL ────────────────────────────────────────────
class Cell {
  constructor(plantId, type, x, y, orient, depth, pathKey) {
    this.plantId = plantId;
    this.type    = type;      // 'seed' | 'body'
    this.x = x; this.y = y;
    this.orient  = orient;    // incoming absolute direction (null for seed)
    this.depth   = depth;
    this.pathKey = pathKey;
    this.sides   = (type === 'body') ? {} : null; // rel → { val, forced }
  }
}

// ─── PLANT ───────────────────────────────────────────
let plantIdSeq = 0;

class Plant {
  constructor(sx, sy, genes = null) {
    this.id         = plantIdSeq++;
    this.genes      = genes instanceof GeneBank ? genes : new GeneBank();
    this.cells      = [];
    this.localOcc   = new Map();  // "x,y" → Cell
    this.frontiers  = new Map();  // depth → tip[]
    this.mature     = false;
    this.reproduced = false;
    this.bornAt     = tick;  // for safety-net timeout
    this.maturedAt  = -1;
    this.deadAt     = -1;
    this.seedX = sx; this.seedY = sy;

    // Place root seed cell
    const seed = new Cell(this.id, 'seed', sx, sy, null, 0, '');
    this._place(seed);
    // Queue first growth attempts from seed in all 4 directions
    this._enq({ kind: 'seedTry', x: sx, y: sy, tryIdx: 0, dirs: DIRS4, depth: 0, path: '' });
  }

  _place(cell) {
    this.cells.push(cell);
    this.localOcc.set(cell.x + ',' + cell.y, cell);
    world.insert(cell.x, cell.y, cell);
    expandBounds(cell.x, cell.y);
  }
  _hasLocal(x, y) { return this.localOcc.has(x + ',' + y); }
  _enq(tip) {
    if (tip.depth > MAX_DEPTH) return;
    const d = tip.depth;
    if (!this.frontiers.has(d)) this.frontiers.set(d, []);
    this.frontiers.get(d).push(tip);
  }
  hasTips() {
    for (const [, arr] of this.frontiers) if (arr.length) return true;
    return false;
  }
  popTip() {
    // Depth-first (smallest depth first = breadth across each layer)
    let minD = Infinity;
    for (const [d, arr] of this.frontiers) if (arr.length && d < minD) minD = d;
    if (minD === Infinity) return null;
    return this.frontiers.get(minD).shift();
  }
  die() {
    for (const c of this.cells) world.remove(c.x, c.y);
    this.cells = [];
    this.localOcc.clear();
  }
}

// ─── SEED WALKER ─────────────────────────────────────
class SeedWalker {
  constructor(parent, x, y) {
    this.genes        = new GeneBank(parent.genes); // mutated copy
    this.parentId     = parent.id;
    this.x = x; this.y = y;
    this.disperseLeft = DISPERSE_STEPS;
    this.searchLeft   = SEARCH_STEPS;
    this.alive        = true;
    this.createdTick  = tick; // for age-based timeout
    // Bias walk direction outward from parent's root
    const dx = x - parent.seedX, dy = y - parent.seedY;
    this.urn = buildBiasUrn(dx, dy);
  }
  step() {
    const dir = this.urn[Math.floor(Math.random() * this.urn.length)];
    this.x += DELTA[dir].dx;
    this.y += DELTA[dir].dy;
    // Seeds do NOT expand viewport bounds — only rooted plant cells do
    if (this.disperseLeft > 0) { this.disperseLeft--; return 'walking'; }
    // Try to land — need CLEARANCE cells of empty space from any plant
    if (!world.hasNearOther(this.x, this.y, CLEARANCE, -1)) return 'land';
    if (--this.searchLeft <= 0) return 'die';
    return 'searching';
  }
}

function buildBiasUrn(dx, dy) {
  const u = [...DIRS4];
  if (dx > 0) u.push('right', 'right');
  if (dx < 0) u.push('left',  'left');
  if (dy > 0) u.push('down',  'down');
  if (dy < 0) u.push('up',    'up');
  return u;
}

// ─── BOUNDING BOX ────────────────────────────────────
let bMinX = 0, bMinY = 0, bMaxX = 0, bMaxY = 0, bInit = false;

function expandBounds(x, y) {
  if (!bInit) { bMinX = bMaxX = x; bMinY = bMaxY = y; bInit = true; return; }
  if (x < bMinX) bMinX = x; if (x > bMaxX) bMaxX = x;
  if (y < bMinY) bMinY = y; if (y > bMaxY) bMaxY = y;
}

function recomputeBounds() {
  bInit = false;
  for (const pl of plants) for (const c of pl.cells) expandBounds(c.x, c.y);
  // Seeds deliberately excluded — they don't drive viewport expansion
}

// ─── VIEWPORT ────────────────────────────────────────
let vp = { offX: 0, offY: 0, sc: 20 };

function computeVP() {
  if (!bInit) return { offX: canvas.width / 2, offY: canvas.height / 2, sc: 20 };
  const minX = bMinX - MARGIN, minY = bMinY - MARGIN;
  const maxX = bMaxX + MARGIN, maxY = bMaxY + MARGIN;
  const spanX = Math.max(MIN_VIEW, maxX - minX + 1);
  const spanY = Math.max(MIN_VIEW, maxY - minY + 1);
  // Keep actual content centred if span is padded to minimum
  const cx = (bMinX + bMaxX) / 2, cy = (bMinY + bMaxY) / 2;
  const vx = cx - spanX / 2,     vy = cy - spanY / 2;
  let sc = Math.min(canvas.width / spanX, canvas.height / spanY);
  sc = Math.max(CELL_MIN_PX, Math.min(CELL_MAX_PX, sc));
  const offX = (canvas.width  - spanX * sc) / 2 - vx * sc;
  const offY = (canvas.height - spanY * sc) / 2 - vy * sc;
  return { offX, offY, sc };
}

// ─── DECISION ENGINE ─────────────────────────────────
function computeKey(tip) {
  if (tip.kind === 'seedTry') return `${tip.path}/SLOT:${tip.dirs[tip.tryIdx]}`;
  if (tip.kind === 'bodyDir') return `${tip.path}/DIR:${tip.rel}`;
  return 'x';
}

const OPPOSITE = { up: 'down', down: 'up', left: 'right', right: 'left' };

// A cell can be placed at (nx, ny) only if:
//   • the spot is unoccupied, AND
//   • all 3 cardinal neighbors except the producing cell are also unoccupied.
// This prevents dense packing and self-intersection; those walls also aren't fertile.
function canPlace(plant, nx, ny, fromDir = null) {
  if (world.has(nx, ny)) return false;
  if (fromDir !== null) {
    const back = OPPOSITE[fromDir]; // direction pointing back at the producing cell
    for (const dir of DIRS4) {
      if (dir === back) continue;   // skip the cell we came from
      const { dx, dy } = DELTA[dir];
      if (world.has(nx + dx, ny + dy)) return false;
    }
  }
  return true;
}

// Return the target position and approach direction for a tip, or null.
function tipTarget(tip) {
  if (tip.kind === 'seedTry') {
    const dir = tip.dirs[tip.tryIdx];
    const { dx, dy } = DELTA[dir];
    return { nx: tip.x + dx, ny: tip.y + dy, fromDir: dir };
  }
  if (tip.kind === 'bodyDir') {
    const abs = REL_TO_ABS[tip.inDir][tip.rel];
    const { dx, dy } = DELTA[abs];
    return { nx: tip.x + dx, ny: tip.y + dy, fromDir: abs };
  }
  return null;
}

// Silently resolve a blocked tip as forced-0 (no urn interaction, not fertile).
function resolveBlocked(plant, tip) {
  if (tip.kind === 'seedTry') {
    tryNextSeedDir(plant, tip); // skip this direction, try next
  } else if (tip.kind === 'bodyDir') {
    const parentCell = plant.localOcc.get(tip.x + ',' + tip.y);
    if (parentCell && parentCell.sides)
      parentCell.sides[tip.rel] = { val: 0, forced: true }; // blocked = not fertile
  }
}

// Apply a gene decision (0 or 1) for a tip whose target is already confirmed valid.
// Blocked targets must be resolved via resolveBlocked() before calling this.
function applyDecision(plant, tip, val) {
  const key = computeKey(tip);
  plant.genes.append(key, val);

  if (tip.kind === 'seedTry') {
    if (val === 1) {
      const dir = tip.dirs[tip.tryIdx];
      const { nx, ny } = tipTarget(tip);
      const body = new Cell(plant.id, 'body', nx, ny, dir, tip.depth + 1, `/B:${dir}`);
      plant._place(body);
      for (const rel of RELS)
        plant._enq({ kind: 'bodyDir', x: nx, y: ny, inDir: dir, rel, depth: tip.depth + 1, path: body.pathKey });
    } else {
      tryNextSeedDir(plant, tip);
    }
    return;
  }

  if (tip.kind === 'bodyDir') {
    const { nx, ny } = tipTarget(tip);
    const abs = REL_TO_ABS[tip.inDir][tip.rel];
    const parentCell = plant.localOcc.get(tip.x + ',' + tip.y);
    if (val === 1) {
      const body = new Cell(plant.id, 'body', nx, ny, abs, tip.depth + 1, `${tip.path}/B:${tip.rel}`);
      plant._place(body);
      for (const rel of RELS)
        plant._enq({ kind: 'bodyDir', x: nx, y: ny, inDir: abs, rel, depth: tip.depth + 1, path: body.pathKey });
      if (parentCell && parentCell.sides) parentCell.sides[tip.rel] = { val: 1, forced: false };
    } else {
      // Freely chose 0 → fertile (may spawn seed)
      if (parentCell && parentCell.sides) parentCell.sides[tip.rel] = { val: 0, forced: false };
    }
    return;
  }
}

function tryNextSeedDir(plant, tip) {
  const next = tip.tryIdx + 1;
  if (next < tip.dirs.length)
    plant._enq({ kind: 'seedTry', x: tip.x, y: tip.y, tryIdx: next, dirs: tip.dirs, depth: tip.depth, path: tip.path });
}

// ─── SEED SPAWNING ───────────────────────────────────
function spawnSeeds(plant) {
  for (const cell of plant.cells) {
    if (cell.type !== 'body' || !cell.sides) continue;
    for (const rel of RELS) {
      const s = cell.sides[rel];
      // Spawn seed from naturally-empty sides (chose 0, not blocked), 25% chance each
      if (s && s.val === 0 && !s.forced && Math.random() < 0.25) {
        const abs = REL_TO_ABS[cell.orient][rel];
        const { dx, dy } = DELTA[abs];
        const sx = cell.x + dx, sy = cell.y + dy;
        seeds.push(new SeedWalker(plant, sx, sy));
      }
    }
  }
}

// ─── GLOBAL STATE ────────────────────────────────────
const plants = [];
const seeds  = [];
let phase       = 'sculpt'; // 'sculpt' | 'sim'
let sculptPlant = null;
let pendingTip  = null;
let tick        = 0;

// ─── SCULPTING PHASE ─────────────────────────────────
function startSculpt() {
  sculptPlant = new Plant(0, 0);
  plants.push(sculptPlant);
  advanceSculpt();
}

function advanceSculpt() {
  // Loop past any tips whose target is already occupied — resolve them silently
  // so the user is never asked to decide about an impossible placement.
  while (true) {
    pendingTip = sculptPlant.popTip();
    if (!pendingTip) {
      sculptPlant.mature = true;
      sculptPlant.maturedAt = 0;
      enterSim();
      return;
    }
    const t = tipTarget(pendingTip);
    if (t && !canPlace(sculptPlant, t.nx, t.ny, t.fromDir)) {
      resolveBlocked(sculptPlant, pendingTip); // auto-resolve, stay in loop
    } else {
      updateSculptUI();
      return;
    }
  }
}

function onChoice(val) {
  if (phase !== 'sculpt' || !pendingTip) return;
  applyDecision(sculptPlant, pendingTip, val);
  advanceSculpt();
}

function updateSculptUI() {
  const tip = pendingTip;
  const key = computeKey(tip);
  const urn = sculptPlant.genes.preview(key);
  const c0  = urn.filter(v => v === 0).length;
  const c1  = urn.filter(v => v === 1).length;
  const tot = c0 + c1;
  const pct0 = Math.round(c0 / tot * 100);
  urnFill0.style.width = pct0 + '%';
  urnFill1.style.width = (100 - pct0) + '%';
  urnLabel.textContent = `${c0}:${c1}`;

  let desc = '';
  if (tip.kind === 'seedTry') desc = `seed → ${tip.dirs[tip.tryIdx]}?`;
  if (tip.kind === 'bodyDir') desc = `branch → ${tip.rel}?`;
  statusEl.textContent = desc;
  btn0.disabled = false;
  btn1.disabled = false;
}

// ─── SIMULATION PHASE ────────────────────────────────
function enterSim() {
  phase = 'sim';
  btn0.disabled = true;
  btn1.disabled = true;
  urnFill0.style.width = '0%';
  urnFill1.style.width = '0%';
  urnLabel.textContent = '';
  hintEl.style.display = 'none';
}

function simTick() {
  tick++;

  // 1. Grow plants — one tip per plant per tick, no cap.
  // IMPORTANT: no `break` here. New plants land at the END of the array,
  // so a budget `break` would starve them permanently, leaving ghost white dots.
  for (const pl of plants) {
    if (pl.mature || pl.deadAt >= 0) continue;
    // Safety net: kill any plant still at 1 cell after a few ticks —
    // catches plants whose tips never got processed due to any edge case.
    if (pl.cells.length <= 1 && tick - pl.bornAt > 3) {
      pl.die(); pl.deadAt = tick; continue;
    }
    const tip = pl.popTip();
    if (tip) {
      const t = tipTarget(tip);
      if (t && !canPlace(pl, t.nx, t.ny, t.fromDir)) {
        resolveBlocked(pl, tip); // blocked → silent forced-0, no urn interaction
      } else {
        applyDecision(pl, tip, pl.genes.sample(computeKey(tip)));
      }
    } else {
      pl.mature    = true;
      pl.maturedAt = tick;
      if (pl.cells.length <= 1) { pl.die(); pl.deadAt = tick; }
    }
  }

  // 2. Reproduce — newly matured plants spawn seeds once
  for (const pl of plants) {
    if (pl.mature && !pl.reproduced && pl.deadAt < 0) {
      spawnSeeds(pl);
      pl.reproduced = true;
    }
  }

  // 3. Step all seeds — step each one, kill by max-age (2× plant lifespan)
  const SEED_MAX_AGE = LIFESPAN * 2;
  for (let i = seeds.length - 1; i >= 0; i--) {
    const s = seeds[i];
    if (!s.alive) { seeds.splice(i, 1); continue; }
    if (tick - s.createdTick > SEED_MAX_AGE) { seeds.splice(i, 1); continue; }
    const result = s.step();
    if (result === 'land') {
      plants.push(new Plant(s.x, s.y, s.genes));
      seeds.splice(i, 1);
    } else if (result === 'die') {
      seeds.splice(i, 1);
    }
  }

  // 4. Kill plants that have outlived their lifespan
  for (const pl of plants) {
    if (pl.mature && pl.deadAt < 0 && pl.maturedAt >= 0 && tick - pl.maturedAt > LIFESPAN) {
      pl.die();
      pl.deadAt = tick;
    }
  }

  // 5. Recompute bounds + prune dead plants periodically
  if (tick % 20 === 0) recomputeBounds();
  if (tick % 80 === 0) {
    for (let i = plants.length - 1; i >= 0; i--)
      if (plants[i].deadAt >= 0 && tick - plants[i].deadAt > 120) plants.splice(i, 1);
  }

  // 6. Update status
  const alive = plants.filter(p => p.deadAt < 0).length;
  const growing = plants.filter(p => p.deadAt < 0 && !p.mature).length;
  statusEl.textContent = `t:${tick} · plants:${alive} (${growing} growing) · seeds:${seeds.length}`;

  // Extinction message
  if (alive === 0 && seeds.length === 0) {
    statusEl.textContent = 'extinct  — reload to start over';
  }
}

// ─── RENDER ──────────────────────────────────────────
function render() {
  vp = computeVP();
  const { offX, offY, sc } = vp;

  ctx.fillStyle = '#000000';
  ctx.fillRect(0, 0, canvas.width, canvas.height);

  // Plant cells — WHITE seed root, GREEN stems, bright GREEN nodes
  for (const pl of plants) {
    if (pl.deadAt >= 0) continue;
    for (const cell of pl.cells) {
      const px = cell.x * sc + offX;
      const py = cell.y * sc + offY;
      if (cell.type === 'seed') {
        ctx.fillStyle = '#ffffff';  // WHITE — origin point
      } else {
        ctx.fillStyle = '#00ff00';  // GREEN — all body cells uniform
      }
      ctx.fillRect(px, py, sc, sc);
    }
  }

  // Walking seeds — BLUE dots
  const seedSz = Math.max(1, sc * 0.5);
  for (const s of seeds) {
    const px = s.x * sc + offX + (sc - seedSz) / 2;
    const py = s.y * sc + offY + (sc - seedSz) / 2;
    ctx.fillStyle = '#ff00ff'; // MAGENTA — R+B, seeds
    ctx.fillRect(px, py, seedSz, seedSz);
  }

  // Sculpt-phase highlight: yellow cell indicating where '1' would grow
  if (phase === 'sculpt' && pendingTip) {
    const tip = pendingTip;
    let hx = tip.x, hy = tip.y;
    if (tip.kind === 'seedTry') {
      const d = DELTA[tip.dirs[tip.tryIdx]];
      hx = tip.x + d.dx; hy = tip.y + d.dy;
    } else if (tip.kind === 'bodyDir') {
      const abs = REL_TO_ABS[tip.inDir][tip.rel];
      const d = DELTA[abs];
      hx = tip.x + d.dx; hy = tip.y + d.dy;
    }
    const px = hx * sc + offX, py = hy * sc + offY;
    ctx.fillStyle = 'rgba(255,255,0,0.18)';
    ctx.fillRect(px, py, sc, sc);
    const lw = Math.max(1, sc * 0.1);
    ctx.strokeStyle = '#ffff00';
    ctx.lineWidth = lw;
    ctx.strokeRect(px + lw / 2, py + lw / 2, sc - lw, sc - lw);

    // Also show a faint 0-preview (red X ghost) to show what clicking 0 means
    if (sc >= 8) {
      ctx.strokeStyle = 'rgba(255,60,20,0.25)';
      ctx.lineWidth = Math.max(1, sc * 0.08);
      ctx.beginPath();
      ctx.moveTo(px + sc * 0.25, py + sc * 0.25);
      ctx.lineTo(px + sc * 0.75, py + sc * 0.75);
      ctx.moveTo(px + sc * 0.75, py + sc * 0.25);
      ctx.lineTo(px + sc * 0.25, py + sc * 0.75);
      ctx.stroke();
    }
  }
}

// ─── MAIN LOOP ───────────────────────────────────────
let lastTs  = 0;
let simAccum = 0;

function loop(ts) {
  const dt = Math.min(ts - lastTs, 200); // clamp to avoid spiral-of-death
  lastTs = ts;

  if (phase === 'sim') {
    simAccum += dt;
    while (simAccum >= TICK_MS) {
      simAccum -= TICK_MS;
      simTick();
    }
  }

  render();
  requestAnimationFrame(loop);
}

// ─── INPUT ───────────────────────────────────────────
btn0.addEventListener('click', () => onChoice(0));
btn1.addEventListener('click', () => onChoice(1));

document.addEventListener('keydown', e => {
  if (phase !== 'sculpt') return;
  if (e.key === '0' || e.key === 'ArrowLeft')  { e.preventDefault(); onChoice(0); }
  if (e.key === '1' || e.key === 'ArrowRight') { e.preventDefault(); onChoice(1); }
});

// ─── INIT ────────────────────────────────────────────
startSculpt();
requestAnimationFrame(ts => { lastTs = ts; loop(ts); });
</script>
</body>
</html>