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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var colors = [ | |
| "rgb(197,27,125)", | |
| "rgb(222,119,174)", | |
| "rgb(241,182,218)", | |
| "rgb(253,224,239)", | |
| "rgb(247,247,247)", | |
| "rgb(230,245,208)", | |
| "rgb(184,225,134)", | |
| "rgb(127,188,65)", | |
| "rgb(77,146,33)" | |
| ]; | |
| var sites = d3.range(100).map(function(d) { | |
| return [Math.random() * width, Math.random() * height]; | |
| }); | |
| var voronoi = d3.geom.voronoi(); | |
| var canvas = d3.select("body").append("canvas") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mousemove", function() { sites[0] = d3.mouse(this); redraw(); }); | |
| var context = canvas.node().getContext("2d"); | |
| redraw(); | |
| function redraw() { | |
| var cells = voronoi(sites); | |
| context.clearRect(0, 0, width, height); | |
| context.fillStyle = "yellow"; | |
| draw(cells[0]); | |
| context.fill(); | |
| for (var k = 0, l = colors.length; k < l; ++k) { | |
| context.fillStyle = colors[k]; | |
| for (var i = 1, n = cells.length; i < n; ++i) { | |
| if (i % l === k && draw(cells[i])) context.fill(); | |
| } | |
| } | |
| context.strokeStyle = "white"; | |
| for (var i = 0, n = cells.length; i < n; ++i) { | |
| if (draw(cells[i])) context.stroke(); | |
| } | |
| context.fillStyle = "black"; | |
| for (var i = 1, n = sites.length, site; i < n; ++i) { | |
| site = sites[i]; | |
| context.beginPath(); | |
| context.arc(site[0], site[1], 1.5, 0, 2 * Math.PI, false); | |
| context.fill(); | |
| } | |
| } | |
| function draw(cell) { | |
| if (cell) { | |
| context.beginPath(); | |
| 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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