Visualization toolmaker. Founder @observablehq. Creator @d3. Former @nytgraphics. Pronounced BOSS-tock.
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Randomized Flood Fill
canvas = {
replay;
const w = width + 28, h = height;
const context = DOM.context2d(w, h, 1);
const image = context.getImageData(0, 0, w, h);
const indexes = [];
let frame = 0;
context.canvas.style.margin = "0 -14px";
context.canvas.style.imageRendering = "pixelated";
visit(w >> 1, h >> 1, 128, 128, 128);
function visit(x, y, r, g, b) {
if (x < 0 || x >= w || y < 0 || y >= h) return;
const i = y * w + x, j = i << 2;
if (image.data[j + 3] === 0) {
image.data[j + 0] = r + (Math.random() < 0.5 ? -1 : 1);
image.data[j + 1] = g + (Math.random() < 0.5 ? -1 : 1);
image.data[j + 2] = b + (Math.random() < 0.5 ? -1 : 1);
image.data[j + 3] = 255;
indexes.push(i);
}
}
while (indexes.length) {
const i = Math.random() * indexes.length | 0;
const j = indexes[i];
const k = indexes.pop();
if (i < indexes.length) indexes[i] = k;
const r = image.data[(j << 2) + 0];
const g = image.data[(j << 2) + 1];
const b = image.data[(j << 2) + 2];
const x = j % w, y = j / w | 0;
visit(x - 1, y, r, g, b);
visit(x + 1, y, r, g, b);
visit(x, y - 1, r, g, b);
visit(x, y + 1, r, g, b);
if (!(++frame % 1000)) {
context.putImageData(image, 0, 0);
yield context.canvas;
}
}
context.putImageData(image, 0, 0);
yield context.canvas;
}
height = 600
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