The Delaunay triangulation, the dual of Voronoi tesselation, creates a planar, triangular mesh for a given set of points. This example updates the Delaunay triangulation 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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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| fill: yellow; | |
| stroke: #000; | |
| } | |
| circle { | |
| fill: #fff; | |
| stroke: #000; | |
| pointer-events: none; | |
| } | |
| .PiYG .q0-9{fill:rgb(197,27,125)} | |
| .PiYG .q1-9{fill:rgb(222,119,174)} | |
| .PiYG .q2-9{fill:rgb(241,182,218)} | |
| .PiYG .q3-9{fill:rgb(253,224,239)} | |
| .PiYG .q4-9{fill:rgb(247,247,247)} | |
| .PiYG .q5-9{fill:rgb(230,245,208)} | |
| .PiYG .q6-9{fill:rgb(184,225,134)} | |
| .PiYG .q7-9{fill:rgb(127,188,65)} | |
| .PiYG .q8-9{fill:rgb(77,146,33)} | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var vertices = d3.range(100).map(function(d) { | |
| return [Math.random() * width, Math.random() * height]; | |
| }); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .attr("class", "PiYG") | |
| .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", 2); | |
| redraw(); | |
| function redraw() { | |
| path = path.data(d3.geom.delaunay(vertices).map(function(d) { return "M" + d.join("L") + "Z"; }), String); | |
| path.exit().remove(); | |
| path.enter().append("path").attr("class", function(d, i) { return "q" + (i % 9) + "-9"; }).attr("d", String); | |
| } | |
| </script> |
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