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----
-title: >-
-    Visualization 3
-description: >-
-    All the pixels.
-series: viz
----
-
-<canvas id="canvas" style="padding-bottom: 2rem;"></canvas>
-
-This visualization is built from the ground up. On every frame a random set of
-pixels is chosen. Each chosen pixel calculates the average of its color and the
-color of a random neighbor. Some random color drift is added in as well. It
-replaces its own color with that calculated color.
-
-Choosing a neighbor is done using the "asteroid rule", ie a pixel at the very
-top row is considered to be the neighbor of the pixel on the bottom row of the
-same column.
-
-Without the asteroid rule the pixels would all eventually converge into a single
-uniform color, generally a light blue, due to the colors at the edge, the reds,
-being quickly averaged away. With the asteroid rule in place the canvas has no
-edges, thus no position on the canvas is favored and balance can be maintained.
-
-<script type="text/javascript">
-let rectSize = 12;
-
-function randn(n) {
-    return Math.floor(Math.random() * n);
-}
-
-let canvas = document.getElementById("canvas");
-canvas.width = window.innerWidth - (window.innerWidth % rectSize);
-canvas.height = window.innerHeight- (window.innerHeight % rectSize);
-let ctx = canvas.getContext("2d");
-
-let w = canvas.width / rectSize;
-let h = canvas.height / rectSize;
-
-let matrices = new Array(2);
-matrices[0] = new Array(w);
-matrices[1] = new Array(w);
-for (let x = 0; x < w; x++) {
-    matrices[0][x] = new Array(h);
-    matrices[1][x] = new Array(h);
-    for (let y = 0; y < h; y++) {
-        let el = {
-            h: 360 * (x / w),
-            s: "100%",
-            l: "50%",
-        };
-        matrices[0][x][y] = el;
-        matrices[1][x][y] = el;
-    }
-}
-
-// draw initial canvas, from here on out only individual rectangles will be
-// filled as they get updated.
-for (let x = 0; x < w; x++) {
-    for (let y = 0; y < h; y++) {
-        let el = matrices[0][x][y];
-        ctx.fillStyle = `hsl(${el.h}, ${el.s}, ${el.l})`;
-        ctx.fillRect(x * rectSize, y * rectSize, rectSize, rectSize);
-    }
-}
-
-
-let requestAnimationFrame = 
-  window.requestAnimationFrame || 
-  window.mozRequestAnimationFrame || 
-  window.webkitRequestAnimationFrame || 
-  window.msRequestAnimationFrame;
-
-let neighbors = [
-    [-1, -1], [0, -1], [1, -1],
-    [-1, 0], [1, 0],
-    [-1, 1], [0, 1], [1, 1],
-];
-
-function randNeighborAsteroid(matrix, x, y) {
-    let neighborCoord = neighbors[randn(neighbors.length)];
-    let neighborX = x+neighborCoord[0];
-    let neighborY = y+neighborCoord[1];
-    neighborX = (neighborX + w) % w;
-    neighborY = (neighborY + h) % h;
-    return matrix[neighborX][neighborY];
-}
-
-function randNeighbor(matrix, x, y) {
-    while (true) {
-        let neighborCoord = neighbors[randn(neighbors.length)];
-        let neighborX = x+neighborCoord[0];
-        let neighborY = y+neighborCoord[1];
-        if (neighborX < 0 || neighborX >= w || neighborY < 0 || neighborY >= h) {
-            continue;
-        }
-        return matrix[neighborX][neighborY];
-    }
-}
-
-let drift = 10;
-function genChildH(elA, elB) {
-    // set the two h values, h1 <= h2
-    let h1 = elA.h;
-    let h2 = elB.h;
-    if (h1 > h2) {
-        h1 = elB.h;
-        h2 = elA.h;
-    }
-
-    // diff must be between 0 (inclusive) and 360 (exclusive). If it's greater
-    // than 180 then it's not the shortest path around, that must be the other
-    // way around the circle.
-    let hChild;
-    let diff = h2 - h1;
-    if (diff > 180) {
-        diff = 360 - diff;
-        hChild = h2 + (diff / 2);
-    } else {
-        hChild = h1 + (diff / 2);
-    }
-
-    hChild += (Math.random() * drift * 2) - drift;
-    hChild = (hChild + 360) % 360;
-    return hChild;
-}
-
-let tick = 0;
-function doTick() {
-    tick++;
-    let currI = tick % 2;
-    let curr = matrices[currI];
-    let lastI = (tick - 1) % 2;
-    let last = matrices[lastI];
-
-    for (let i = 0; i < (w * h / 2); i++) {
-        let x = randn(w);
-        let y = randn(h);
-        if (curr[x][y].lastTick == tick) continue;
-
-        let neighbor = randNeighborAsteroid(last, x, y);
-        curr[x][y].h = genChildH(curr[x][y], neighbor);
-        curr[x][y].lastTick = tick;
-        ctx.fillStyle = `hsl(${curr[x][y].h}, ${curr[x][y].s}, ${curr[x][y].l})`;
-        ctx.fillRect(x * rectSize, y * rectSize, rectSize, rectSize);
-    }
-
-    matrices[currI] = curr;
-    requestAnimationFrame(doTick);
-}
-
-requestAnimationFrame(doTick);
-
-</script>