Inspired by Koalas to the max.
Created
May 28, 2017 20:48
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Quadtree pixelation
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8" /> | |
| </head> | |
| <body> | |
| <canvas width="960" height="500"></canvas> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| let width = 960, | |
| height = 500, | |
| canvas = document.querySelector("canvas"), | |
| context = canvas.getContext("2d"), | |
| active = width * height, | |
| img = new Image(), | |
| tree = d3.quadtree() | |
| .extent([[0, 0], [width, height]]); | |
| img.onload = draw; | |
| img.src = "neon.jpg"; | |
| function draw() { | |
| context.drawImage(img, 0, 0); | |
| let data = context.getImageData(0, 0, width, height).data; | |
| for (let x = 0; x < width; x++) { | |
| for (let y = 0; y < height; y++) { | |
| tree.add(colorAt(data, x, y)); | |
| } | |
| } | |
| setAverageColor(tree.root()); | |
| depixelate(tree.root()); | |
| } | |
| function depixelate(node, x=0, y=0, w=(tree._x1 - tree._x0), h=(tree._y1 - tree._y0), depth=1) { | |
| context.fillStyle = "rgb(" + node.color.map(d => Math.round(d)) + ")"; | |
| context.fillRect(x, y, w, h); | |
| if (node.length) { | |
| node.forEach((child, i) => { | |
| let cw = w / 2, | |
| ch = h / 2, | |
| cx = i % 2 ? x + cw : x, | |
| cy = i > 1 ? y + ch : y; | |
| setTimeout(() => depixelate(child, cx, cy, cw, ch, depth + 1), depth > 7 ? 0 : d3.randomExponential(1 / 1000)()); | |
| }); | |
| } else { | |
| active--; | |
| if (!active) { | |
| active = width * height; | |
| setTimeout(() => depixelate(tree.root()), 500); | |
| } | |
| } | |
| } | |
| function setAverageColor(node) { | |
| if (!node.length) { | |
| return node.color = node.data.slice(2); | |
| } | |
| return node.color = arrayMean(node.filter(d => d).map(setAverageColor)); | |
| } | |
| function arrayMean(arrays) { | |
| let mean = new Array(3).fill(0); | |
| for (let i = 0, l = arrays.length; i < l; i++) { | |
| for (let j = 0; j < 3; j++) { | |
| mean[j] += arrays[i][j] / l; | |
| } | |
| } | |
| return mean; | |
| } | |
| function colorAt(data, x, y) { | |
| let index = y * width + x; | |
| return [x, y, data[index * 4], data[index * 4 + 1], data[index * 4 + 2]]; | |
| } | |
| </script> |
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