Inspired by Adam Pearce.
Last active
March 10, 2019 23:18
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Voronoi Spirals
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height: 960 | |
license: gpl-3.0 | |
redirect: https://observablehq.com/@mbostock/voronoi-spirals |
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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), | |
duration = 5000; | |
var color = d3.scaleCubehelix() | |
.domain([0, duration]); | |
var timer = d3.timer(function(elapsed) { | |
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 = color(elapsed); | |
context.fill(); | |
if (elapsed > duration) timer.stop(); | |
}); | |
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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