From f3340ae5f4ac6c60823bf4d14e1fcdbeaaec353c Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Sat, 21 May 2022 14:07:14 -0600
Subject: Remove old code related to static, it's not needed anymore

---
 static/src/_posts/2021-07-01-viz-7.md | 440 ----------------------------------
 1 file changed, 440 deletions(-)
 delete mode 100644 static/src/_posts/2021-07-01-viz-7.md

(limited to 'static/src/_posts/2021-07-01-viz-7.md')

diff --git a/static/src/_posts/2021-07-01-viz-7.md b/static/src/_posts/2021-07-01-viz-7.md
deleted file mode 100644
index 5bf3e8d..0000000
--- a/static/src/_posts/2021-07-01-viz-7.md
+++ /dev/null
@@ -1,440 +0,0 @@
----
-title: >-
-    Visualization 7
-description: >-
-    Feedback Loop.
-series: viz
-tags: tech art
----
-
-<script type="text/javascript">
-
-function randn(n) {
-    return Math.floor(Math.random() * n);
-}
-
-const w = 100;
-const h = 60;
-
-class Canvas {
-  constructor(canvasDOM) {
-    this.dom = canvasDOM;
-    this.ctx = canvasDOM.getContext("2d");
-
-    // expand canvas element's width to match parent.
-    this.dom.width = this.dom.parentElement.offsetWidth;
-
-    // rectSize must be an even number or the pixels don't display nicely.
-    this.rectSize = Math.floor(this.dom.width / w /2) * 2;
-
-    this.dom.width = w * this.rectSize;
-    this.dom.height = h * this.rectSize;
-  }
-
-  rectSize() {
-    return Math.floor(this.dom.width / w);
-  }
-}
-
-class UniverseState {
-  constructor(layers) {
-    this.tick = 0;
-    this.layers = layers;
-  }
-
-  neighboringLayers(layerIndex) {
-    const prevIndex = layerIndex-1;
-    const prev = prevIndex < 0 ? null : this.layers[prevIndex];
-
-    const nextIndex = layerIndex+1;
-    const next = nextIndex >= this.layers.length ? null : this.layers[nextIndex];
-
-    return [prev, next];
-  }
-}
-
-const defaultKnobs = {
-  maxNewElsPerTick: 10,
-  ageOfDeath: 30,
-  drift: 30,
-  neighborScalar: 0,
-  prevLayerScalar: 0,
-  prevLayerLikenessScalar: 0,
-  nextLayerScalar: 0,
-  nextLayerLikenessScalar: 0,
-  chaos: 0,
-};
-
-class Layer {
-  constructor(className, newEl, knobs = {}) {
-    this.className = className;
-    this.els = {};
-    this.diff = {};
-    this.newEl = newEl;
-    this.knobs = { ...defaultKnobs, ...knobs };
-  }
-
-  _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"};
-  }
-
-  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];
-      }
-    }
-  }
-
-  update(state, thisLayerIndex) {
-    // Apply diff from previous update first. The diff can't be applied last
-    // because it needs to be present during the draw phase.
-    this.applyDiff();
-
-    const allEls = this.getAll().sort(() => Math.random() - 0.5);
-
-    if (allEls.length == 0) {
-      const newEl = this.newEl(this, [])
-      newEl.tick = state.tick;
-      this.set([w/2, h/2], newEl);
-      return;
-    }
-
-    let newEls = 0;
-    for (const el of allEls) {
-      const nCoord = randEmptyNeighboringCoord(this, el.coord);
-      if (!nCoord) continue; // el has no empty neighboring spots
-
-      const newEl = this.newEl(this, neighboringElsOf(this, nCoord))
-      newEl.tick = state.tick;
-      this.set(nCoord, newEl);
-
-      newEls++;
-      if (newEls >= this.knobs.maxNewElsPerTick) break;
-    }
-
-    const calcLayerBonus = (el, layer, scalar, likenessScalar) => {
-        if (!layer) return 0;
-        const nEls = neighboringElsOf(layer, el.coord, true)
-
-        const likeness = nEls.reduce((likeness, nEl) => {
-            const diff = Math.abs(nEl.c - el.c);
-            return likeness + Math.max(diff, Math.abs(1 - diff));
-        }, 0);
-
-        return (nEls.length * scalar) + (likeness * likenessScalar);
-    };
-
-    const [prevLayer, nextLayer] = state.neighboringLayers(thisLayerIndex);
-
-    for (const el of allEls) {
-      const age = state.tick - el.tick;
-      const neighborBonus = neighboringElsOf(this, el.coord).length * this.knobs.neighborScalar;
-      const prevLayerBonus = calcLayerBonus(el, prevLayer, this.knobs.prevLayerScalar, this.knobs.prevLayerLikenessScalar);
-      const nextLayerBonus = calcLayerBonus(el, nextLayer, this.knobs.nextLayerScalar, this.knobs.nextLayerLikenessScalar);
-      const chaos = (this.chaos > 0) ? randn(this.knobs.chaos) : 0;
-
-      if (age - neighborBonus - prevLayerBonus - nextLayerBonus + chaos >= this.knobs.ageOfDeath) {
-        this.unset(el.coord);
-      }
-    }
-  }
-
-  draw(canvas) {
-    for (const coordStr in this.diff) {
-      const el = this.diff[coordStr];
-      const coord = JSON.parse(coordStr);
-
-      if (el.action == "set") {
-        canvas.ctx.fillStyle = `hsl(${el.h}, ${el.s}, ${el.l})`;
-        canvas.ctx.fillRect(
-          coord[0]*canvas.rectSize, coord[1]*canvas.rectSize,
-          canvas.rectSize, canvas.rectSize,
-        );
-
-      } else {
-        canvas.ctx.clearRect(
-          coord[0]*canvas.rectSize, coord[1]*canvas.rectSize,
-          canvas.rectSize, canvas.rectSize,
-        );
-      }
-    }
-  }
-}
-
-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(layer, coord) {
-  const neighbors = neighborsOf(coord).sort(() => Math.random() - 0.5);
-  for (const nCoord of neighbors) {
-    if (!layer.get(nCoord)) return nCoord;
-  }
-  return null;
-}
-
-function neighboringElsOf(layer, coord, includeCoord = false) {
-  const neighboringEls = [];
-
-  const neighboringCoords = neighborsOf(coord);
-  if (includeCoord) neighboringCoords.push(coord);
-
-  for (const nCoord of neighboringCoords) {
-    const el = layer.get(nCoord);
-    if (el) neighboringEls.push(el);
-  }
-  return neighboringEls;
-}
-
-function newEl(h, l) {
-  return {
-    h: h,
-    s: "100%",
-    l: l,
-    c: h / 360, // c is used to compare the element to others
-  };
-}
-
-function mkNewEl(l) {
-  return (layer, nEls) => {
-    const s = "100%";
-    if (nEls.length == 0) {
-      const h = randn(360);
-      return newEl(h, l);
-    }
-
-    // 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() * layer.knobs.drift * 2) - layer.knobs.drift;
-    h = (h + 360) % 360;
-
-    return newEl(h, l);
-  }
-}
-
-class Universe {
-  constructor(canvasesByClass, layers) {
-    this.canvasesByClass = canvasesByClass;
-    this.state = new UniverseState(layers);
-  }
-
-  update() {
-    this.state.tick++;
-    let prevLayer;
-    this.state.layers.forEach((layer, i) => {
-        layer.update(this.state, i);
-        prevLayer = layer;
-    });
-  }
-
-  draw() {
-    this.state.layers.forEach((layer) => {
-      if (!this.canvasesByClass[layer.className]) return;
-      this.canvasesByClass[layer.className].forEach((canvas) => {
-        layer.draw(canvas);
-      });
-    });
-  }
-}
-
-</script>
-
-<style>
-
-.canvasContainer {
-  display: grid;
-  margin-bottom: 2rem;
-  text-align: center;
-}
-
-canvas {
-  border: 1px dashed #AAA;
-  width: 100%;
-  grid-area: 1/1/2/2;
-}
-
-</style>
-
-<div class="canvasContainer">
-  <canvas class="layer1"></canvas>
-  <canvas class="layer2"></canvas>
-</div>
-
-<div class="row">
-
-  <div class="columns six">
-    <h3>Bottom Layer</h3>
-    <div class="canvasContainer"><canvas class="layer1"></canvas></div>
-    <div class="layer1 layerParams">
-        <label>Max New Elements Per Tick</label><input type="text" param="maxNewElsPerTick" />
-        <label>Color Drift</label><input type="text" param="drift" />
-        <label>Age of Death</label><input type="text" param="ageOfDeath" />
-        <label>Neighbor Scalar</label><input type="text" param="neighborScalar" />
-        <label>Top Layer Neighbor Scalar</label><input type="text" param="nextLayerScalar" />
-        <label>Top Layer Neighbor Likeness Scalar</label><input type="text" param="nextLayerLikenessScalar" />
-    </div>
-  </div>
-
-  <div class="columns six">
-    <h3>Top Layer</h3>
-    <div class="canvasContainer"><canvas class="layer2"></canvas></div>
-    <div class="layer2 layerParams">
-        <label>Max New Elements Per Tick</label><input type="text" param="maxNewElsPerTick" />
-        <label>Color Drift</label><input type="text" param="drift" />
-        <label>Age of Death</label><input type="text" param="ageOfDeath" />
-        <label>Neighbor Scalar</label><input type="text" param="neighborScalar" />
-        <label>Bottom Layer Neighbor Scalar</label><input type="text" param="prevLayerScalar" />
-        <label>Bottom Layer Neighbor Likeness Scalar</label><input type="text" param="prevLayerLikenessScalar" />
-    </div>
-  </div>
-
-</div>
-
-Once again, this visualization iterates upon the previous. In the last one the
-top layer was able to "see" the bottom, and was therefore able to bolster or
-penalize its own elements which were on or near bottom layer elements, but not
-vice-versa. This time both layers can see each other, and the "Layer Neighbor
-Scalar" can be used to adjust lifetime of elements which are on/near elements of
-the neighboring layer.
-
-By default, the bottom layer has a high affinity to the top, and the top layer
-has a some (but not as much) affinity in return.
-
-Another addition is the "likeness" scalar. Likeness is defined as the degree to
-which one element is like another. In this visualization likeness is determined
-by color. The "Layer Neighbor Likeness Scalar" adjusts the lifetime of elements
-based on how like they are to nearby elements on the neighboring layer.
-
-By default, the top layer has a high affinity for the bottom's color, but the
-bottom doesn't care about the top's color at all (and so its color will drift
-aimlessly).
-
-And finally "Color Drift" can be used to adjust the degree to which the color of
-new elements can diverge from its parents. This has always been hardcoded, but
-can now be adjusted separately across the different layers.
-
-In the default configuration the top layer will (eventually) converge to roughly
-match the bottom both in shape and color. When I first implemented the likeness
-scaling I thought it was broken, because the top would never converge to the
-bottom's color.
-
-What I eventually realized was that the top must have a higher color drift than
-the bottom in order for it to do so, otherwise the top would always be playing
-catchup. However, if the drift difference is _too_ high then the top layer
-becomes chaos and also doesn't really follow the color of the bottom. A
-difference of 10 (degrees out of 360) is seemingly enough.
-
-<script>
-
-const canvasesByClass = {};
-[...document.getElementsByTagName("canvas")].forEach((canvasDOM) => {
-
-  const canvas = new Canvas(canvasDOM);
-  canvasDOM.classList.forEach((name) => {
-    if (!canvasesByClass[name]) canvasesByClass[name] = [];
-    canvasesByClass[name].push(canvas);
-  })
-});
-
-const layers = [
-
-  new Layer("layer1", mkNewEl("90%"), {
-    maxNewElsPerTick: 2,
-    ageOfDeath: 30,
-    drift: 40,
-    neighborScalar: 50,
-    nextLayerScalar: 20,
-  }),
-
-  new Layer("layer2", mkNewEl("50%", ), {
-    maxNewElsPerTick: 15,
-    ageOfDeath: 1,
-    drift: 50,
-    neighborScalar: 5,
-    prevLayerScalar: 5,
-    prevLayerLikenessScalar: 20,
-  }),
-
-];
-
-for (const layer of layers) {
-    document.querySelectorAll(`.${layer.className}.layerParams > input`).forEach((input) => {
-        const param = input.getAttribute("param");
-
-        // pre-fill input values
-        input.value = layer.knobs[param];
-
-        input.onchange = () => {
-            console.log(`setting ${layer.className}.${param} to ${input.value}`);
-            layer.knobs[param] = input.value;
-        };
-    });
-}
-
-const universe = new Universe(canvasesByClass, layers);
-
-const requestAnimationFrame =
-  window.requestAnimationFrame ||
-  window.mozRequestAnimationFrame ||
-  window.webkitRequestAnimationFrame ||
-  window.msRequestAnimationFrame;
-
-function doTick() {
-  universe.update();
-  universe.draw();
-  requestAnimationFrame(doTick);
-}
-
-doTick();
-
-</script>
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