Inspired by Adam Pearce.
Created
March 29, 2016 20:47
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Voronoi Spirals III
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| height: 960 | |
| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <canvas width="960" height="960"></canvas> | |
| <script src="https://d3js.org/d3.v4.0.0-alpha.28.min.js"></script> | |
| <script> | |
| var canvas = d3.select("canvas").node(), | |
| context = canvas.getContext("2d"), | |
| width = canvas.width, | |
| height = canvas.height; | |
| var sites = d3.range(100).map(function() { return [Math.random() * width, Math.random() * height]; }), | |
| cells = d3.voronoi().size([width, height]).polygons(sites), | |
| formatHex = d3.format("02x"); | |
| var colors = d3.range(256) | |
| .map(d3.scaleRainbow().domain([0, 255])) | |
| .map(function(c) { return d3.rgb(c); }); | |
| for (var i = 0; i < 256; ++i) { | |
| context.beginPath(); | |
| cells.forEach(function(cell) { | |
| drawCell(cell); | |
| var p0 = cell.shift(), | |
| p1 = cell[0], | |
| t = Math.min(0.5, 4 / distance(p0, p1)), | |
| p2 = [p0[0] * (1 - t) + p1[0] * t, p0[1] * (1 - t) + p1[1] * t]; | |
| cell.push(p2); | |
| }); | |
| context.fillStyle = "#" + formatHex(i) + "0000"; | |
| context.fill(); | |
| } | |
| var source = context.getImageData(0, 0, width, height).data, | |
| targetBuffer = context.createImageData(width, height), | |
| target = targetBuffer.data; | |
| for (var i = 0, y = 0; y < height; ++y) { | |
| for (var x = 0; x < width; ++x, i += 4) { | |
| target[i + 0] = | |
| target[i + 1] = | |
| target[i + 2] = | |
| target[i + 3] = 255; | |
| } | |
| } | |
| context.clearRect(0, 0, width, height); | |
| d3.timer(function(elapsed) { | |
| for (var i = 0, y = 0; y < height; ++y) { | |
| for (var x = 0; x < width; ++x, i += 4) { | |
| var c = colors[Math.floor(source[i] + elapsed / 10) % 256]; | |
| target[i + 0] = c.r; | |
| target[i + 1] = c.g; | |
| target[i + 2] = c.b; | |
| } | |
| } | |
| context.putImageData(targetBuffer, 0, 0); | |
| }); | |
| function drawCell(cell) { | |
| context.moveTo(cell[0][0], cell[0][1]); | |
| for (var i = 1, n = cell.length; i < n; ++i) context.lineTo(cell[i][0], cell[i][1]); | |
| context.closePath(); | |
| } | |
| function distance(a, b) { | |
| var dx = a[0] - b[0], dy = a[1] - b[1]; | |
| return Math.sqrt(dx * dx + dy * dy); | |
| } | |
| </script> |
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