Quadtree layer to trigger the closest circle.
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March 24, 2016 16:07
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Quadtree triggering
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>Quadtree</title> | |
| <style> | |
| .overlay { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var color = d3.scale.ordinal() | |
| .range(["#8dd3c7","#ffffb3","#bebada","#fb8072","#80b1d3","#fdb462","#b3de69","#fccde5","#d9d9d9","#bc80bd","#ccebc5","#ffed6f"]); | |
| var data = d3.range(150).map(function(d) { | |
| return [d3.random.normal(width / 2, 80)(), d3.random.normal(height / 2, 80)()]; | |
| }); | |
| var quadtree = d3.geom.quadtree() | |
| .extent([[-1, -1], [width + 1, height + 1]]) | |
| (data); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.selectAll(".node") | |
| .data(nodes(quadtree)) | |
| .enter().append("rect") | |
| .attr("x", function(d) { return d.x0; }) | |
| .attr("y", function(d) { return d.y0; }) | |
| .attr("width", function(d) { return d.y1 - d.y0; }) | |
| .attr("height", function(d) { return d.x1 - d.x0; }) | |
| .style("fill","none") | |
| .style("stroke","#ccc") | |
| .style("shape-rendering","crispEdges"); | |
| var point = svg.selectAll(".point") | |
| .data(data) | |
| .enter().append("circle") | |
| .attr("cx", function(d) { return d[0]; }) | |
| .attr("cy", function(d) { return d[1]; }) | |
| .attr("r", 5) | |
| .style("stroke-width",1) | |
| .style("stroke","black") | |
| .style("fill",function(d,i) { return color(i); }); | |
| svg.append("rect") | |
| .attr("class", "overlay") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mousemove", mousemoved); | |
| function mousemoved() { | |
| point.style("stroke-width",1);; | |
| point.filter(function(d) { return d === quadtree.find(d3.mouse(this)); }).style("stroke-width",3);; | |
| } | |
| function nodes(quadtree) { | |
| var nodes = []; | |
| quadtree.visit(function(node, x0, y0, x1, y1) { | |
| node.x0 = x0, node.y0 = y0; | |
| node.x1 = x1, node.y1 = y1; | |
| nodes.push(node); | |
| }); | |
| return nodes; | |
| } | |
| </script> |
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