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----
-title: >-
-    Visualization 4
-description: >-
-    Birth, death, and colors.
-series: viz
-tags: tech art
----
-
-<canvas id="canvas" style="padding-bottom: 2rem;" width="100%" height="100%"></canvas>
-
-This visualization is a conglomeration of ideas from all the previous ones. On
-each tick up to 20 new pixels are generated. The color of each new pixel is
-based on the average color of its neighbors, plus some random drift.
-
-Each pixel dies after a certain number of ticks, `N`. A pixel's life can be
-extended by up to `8N` ticks, one for each neighbor it has which is still alive.
-This mechanism accounts for the strange behavior which is seen when the
-visualization first loads, but also allows for more coherent clusters of pixels
-to hold together as time goes on.
-
-The asteroid rule is also in effect in this visualization, so the top row and
-bottom row pixels are neighbors of each other, and similarly for the rightmost
-and leftmost column pixels.
-
-<script type="text/javascript">
-
-function randn(n) {
-    return Math.floor(Math.random() * n);
-}
-
-const canvas = document.getElementById("canvas");
-const parentWidth = canvas.parentElement.offsetWidth;
-
-const rectSize = Math.floor(parentWidth /100 /2) *2; // must be even number
-console.log("rectSize", rectSize);
-
-canvas.width = parentWidth - rectSize - (parentWidth % rectSize);
-canvas.height = canvas.width * 0.75;
-canvas.height -= canvas.height % rectSize;
-const ctx = canvas.getContext("2d");
-
-const w = (canvas.width / rectSize) - 1;
-const h = (canvas.height / rectSize) - 1;
-
-class Elements {
-  constructor() {
-    this.els = {};
-    this.diff = {};
-  }
-
-  _normCoord(coord) {
-    if (typeof coord !== 'string') coord = JSON.stringify(coord);
-    return coord;
-  }
-
-  get(coord) {
-    return this.els[this._normCoord(coord)];
-  }
-
-  getAll() {
-    return Object.values(this.els);
-  }
-
-  set(coord, el) {
-    this.diff[this._normCoord(coord)] = {action: "set", coord: coord, ...el};
-  }
-
-  unset(coord) {
-    this.diff[this._normCoord(coord)] = {action: "unset"};
-  }
-
-  drawDiff(ctx) {
-    for (const coordStr in this.diff) {
-      const el = this.diff[coordStr];
-      const coord = JSON.parse(coordStr);
-
-      if (el.action == "set") {
-        ctx.fillStyle = `hsl(${el.h}, ${el.s}, ${el.l})`;
-      } else {
-        ctx.fillStyle = `#FFF`;
-      }
-
-      ctx.fillRect(coord[0]*rectSize, coord[1]*rectSize, rectSize, rectSize);
-    }
-  }
-
-  applyDiff() {
-    for (const coordStr in this.diff) {
-      const el = this.diff[coordStr];
-      delete this.diff[coordStr];
-
-      if (el.action == "set") {
-        delete el.action;
-        this.els[coordStr] = el;
-      } else {
-        delete this.els[coordStr];
-      }
-    }
-  }
-}
-
-const neighbors = [
-    [-1, -1],   [0, -1],   [1, -1],
-    [-1, 0], /* [0, 0], */ [1, 0],
-    [-1, 1],    [0, 1],    [1, 1],
-];
-
-function neighborsOf(coord) {
-  return neighbors.map((n) => {
-    let nX = coord[0]+n[0];
-    let nY = coord[1]+n[1];
-    nX = (nX + w) % w;
-    nY = (nY + h) % h;
-    return [nX, nY];
-  });
-}
-
-function randEmptyNeighboringCoord(els, coord) {
-  const neighbors = neighborsOf(coord).sort(() => Math.random() - 0.5);
-  for (const nCoord of neighbors) {
-    if (!els.get(nCoord)) return nCoord;
-  }
-  return null;
-}
-
-function neighboringElsOf(els, coord) {
-  const neighboringEls = [];
-  for (const nCoord of neighborsOf(coord)) {
-    const el = els.get(nCoord);
-    if (el) neighboringEls.push(el);
-  }
-  return neighboringEls;
-}
-
-const drift = 30;
-function newEl(nEls) {
-
-  // for each h (which can be considered as degrees around a circle) break the h
-  // down into x and y vectors, and add those up separately. Then find the angle
-  // between those two resulting vectors, and that's the "average" h value.
-  let x = 0;
-  let y = 0;
-  nEls.forEach((el) => {
-    const hRad = el.h * Math.PI / 180;
-    x += Math.cos(hRad);
-    y += Math.sin(hRad);
-  });
-
-  let h = Math.atan2(y, x);
-  h = h / Math.PI * 180;
-
-  // apply some random drift, normalize
-  h += (Math.random() * drift * 2) - drift;
-  h = (h + 360) % 360;
-
-  return {
-    h: h,
-    s: "100%",
-    l: "50%",
-  };
-}
-
-const requestAnimationFrame = 
-  window.requestAnimationFrame || 
-  window.mozRequestAnimationFrame || 
-  window.webkitRequestAnimationFrame || 
-  window.msRequestAnimationFrame;
-
-const els = new Elements();
-
-const maxNewElsPerTick = 20;
-const deathThresh = 20;
-
-let tick = 0;
-function doTick() {
-  tick++;
-
-  const allEls = els.getAll().sort(() => Math.random() - 0.5);
-
-  if (allEls.length == 0) {
-    els.set([w/2, h/2], {
-      h: randn(360),
-      s: "100%",
-      l: "50%",
-    });
-  }
-
-  let newEls = 0;
-  for (const el of allEls) {
-    const nCoord = randEmptyNeighboringCoord(els, el.coord);
-    if (!nCoord) continue; // el has no empty neighboring spots
-
-    const nEl = newEl(neighboringElsOf(els, nCoord))
-    nEl.tick = tick;
-    els.set(nCoord, nEl);
-
-    newEls++;
-    if (newEls >= maxNewElsPerTick) break;
-  }
-
-  for (const el of allEls) {
-    const nEls = neighboringElsOf(els, el.coord);
-    if (tick - el.tick - (nEls.length * deathThresh) >= deathThresh) els.unset(el.coord);
-  }
-
-  els.drawDiff(ctx);
-  els.applyDiff();
-  requestAnimationFrame(doTick);
-}
-requestAnimationFrame(doTick);
-
-</script>