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voronoi tests
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<canvas width="960" height="500"></canvas> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script> | |
var canvas = d3.select("canvas").on("touchmove mousemove", moved).node(), | |
context = canvas.getContext("2d"), | |
width = canvas.width, | |
height = canvas.height; | |
var sites = d3.range(10000) | |
.map(function(d) { return [Math.random() * width, Math.random() * height]; }); | |
var voronoi = d3.voronoi() | |
.extent([[-1, -1], [width + 1, height + 1]]); | |
redraw(); | |
function moved() { | |
sites[0] = d3.mouse(this); | |
redraw(); | |
} | |
function redraw() { | |
var diagram = voronoi(sites), | |
links = diagram.links(), | |
polygons = diagram.polygons(); | |
context.clearRect(0, 0, width, height); | |
context.beginPath(); | |
drawCell(polygons[0]); | |
context.fillStyle = "#f00"; | |
context.fill(); | |
context.beginPath(); | |
for (var i = 0, n = polygons.length; i < n; ++i) drawCell(polygons[i]); | |
context.strokeStyle = "#000"; | |
context.stroke(); | |
context.beginPath(); | |
for (var i = 0, n = links.length; i < n; ++i) drawLink(links[i]); | |
context.strokeStyle = "rgba(0,0,0,0.2)"; | |
context.stroke(); | |
context.beginPath(); | |
drawSite(sites[0]); | |
context.fillStyle = "#fff"; | |
context.fill(); | |
context.beginPath(); | |
for (var i = 1, n = sites.length; i < n; ++i) drawSite(sites[i]); | |
context.fillStyle = "#000"; | |
context.fill(); | |
context.strokeStyle = "#fff"; | |
context.stroke(); | |
} | |
function drawSite(site) { | |
context.moveTo(site[0] + 2.5, site[1]); | |
context.arc(site[0], site[1], 2.5, 0, 2 * Math.PI, false); | |
} | |
function drawLink(link) { | |
context.moveTo(link.source[0], link.source[1]); | |
context.lineTo(link.target[0], link.target[1]); | |
} | |
function drawCell(cell) { | |
if (!cell) return false; | |
context.moveTo(cell[0][0], cell[0][1]); | |
for (var j = 1, m = cell.length; j < m; ++j) { | |
context.lineTo(cell[j][0], cell[j][1]); | |
} | |
context.closePath(); | |
return true; | |
} | |
</script> |
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