The Voronoi tessellation shows the closest point on the plane for a given set of points. This example updates the Voronoi diagram in response to mouse interaction! Colors by Cynthia Brewer; algorithm by Steven Fortune; implementation based on work by Nicolas Garcia Belmonte; interaction inspired by Raymond Hill.
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Voronoi Tessellation
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| * { | |
| margin:0; | |
| padding:0; | |
| } | |
| body { | |
| background-color: rgba(255,255,255,0.8); | |
| } | |
| path:first-child { | |
| fill: #2d2d2a !important; | |
| } | |
| circle { | |
| pointer-events: none; | |
| } | |
| path { | |
| fill: rgba(255,255,255,0.1) | |
| } | |
| </style> | |
| <body> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <script> | |
| var width = Math.max(960, innerWidth), | |
| height = Math.max(500, innerHeight); | |
| var vertices = d3.range(100).map(function(d) { | |
| return [Math.random() * width, Math.random() * height]; | |
| }); | |
| var voronoi = d3.geom.voronoi() | |
| .clipExtent([[0, 0], [width, height]]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mousemove", function() { vertices[0] = d3.mouse(this); redraw(); }); | |
| var path = svg.append("g").selectAll("path"); | |
| svg.selectAll("circle") | |
| .data(vertices.slice(1)) | |
| .enter().append("circle") | |
| .attr("transform", function(d) { return "translate(" + d + ")"; }) | |
| .attr("r", 1.5); | |
| redraw(); | |
| function redraw() { | |
| path = path | |
| .data(voronoi(vertices), polygon); | |
| path.exit().remove(); | |
| path.enter().append("path") | |
| .attr("d", polygon); | |
| path.order(); | |
| } | |
| function polygon(d) { | |
| return "M" + d.join("L") + "Z"; | |
| } | |
| window.addEventListener('message',function(e) { | |
| e.source.postMessage('ready:' + e.data,e.origin); | |
| svg.on("click", function() { e.source.postMessage(e.data,e.origin); }); | |
| },false); | |
| </script> |
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