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Voronoi-based point picker
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| <html> | |
| <head> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js"></script> | |
| </head> | |
| <body> | |
| <div id="chart"> | |
| </div> | |
| <script type="text/javascript"> | |
| var w = 960, | |
| h = 500; | |
| var vertices = d3.range(1000).map(function(d) { | |
| return [Math.random() * w, Math.random() * h]; | |
| }); | |
| var svg = d3.select("#chart") | |
| .append("svg:svg") | |
| .attr("width", w) | |
| .attr("height", h); | |
| var paths, points, clips; | |
| clips = svg.append("svg:g").attr("id", "point-clips"); | |
| points = svg.append("svg:g").attr("id", "points"); | |
| paths = svg.append("svg:g").attr("id", "point-paths"); | |
| clips.selectAll("clipPath") | |
| .data(vertices) | |
| .enter().append("svg:clipPath") | |
| .attr("id", function(d, i) { return "clip-"+i;}) | |
| .append("svg:circle") | |
| .attr('cx', function(d) { return d[0]; }) | |
| .attr('cy', function(d) { return d[1]; }) | |
| .attr('r', 20); | |
| paths.selectAll("path") | |
| .data(d3.geom.voronoi(vertices)) | |
| .enter().append("svg:path") | |
| .attr("d", function(d) { return "M" + d.join(",") + "Z"; }) | |
| .attr("id", function(d,i) { | |
| return "path-"+i; }) | |
| .attr("clip-path", function(d,i) { return "url(#clip-"+i+")"; }) | |
| .style("fill", d3.rgb(230, 230, 230)) | |
| .style('fill-opacity', 0.4) | |
| .style("stroke", d3.rgb(200,200,200)); | |
| paths.selectAll("path") | |
| .on("mouseover", function(d, i) { | |
| d3.select(this) | |
| .style('fill', d3.rgb(31, 120, 180)); | |
| svg.select('circle#point-'+i) | |
| .style('fill', d3.rgb(31, 120, 180)) | |
| }) | |
| .on("mouseout", function(d, i) { | |
| d3.select(this) | |
| .style("fill", d3.rgb(230, 230, 230)); | |
| svg.select('circle#point-'+i) | |
| .style('fill', 'black') | |
| }); | |
| points.selectAll("circle") | |
| .data(vertices) | |
| .enter().append("svg:circle") | |
| .attr("id", function(d, i) { | |
| return "point-"+i; }) | |
| .attr("transform", function(d) { return "translate(" + d + ")"; }) | |
| .attr("r", 2) | |
| .attr('stroke', 'none'); | |
| </script> | |
| </body> | |
| </html> |
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