Chord diagrams show directed relationships among a group of entities. This example also demonstrates simple interactivity by using mouseover filtering. Layout inspired by Martin Krzywinski's beautiful work on Circos.
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 10px sans-serif; | |
| } | |
| .chord path { | |
| fill-opacity: .67; | |
| stroke: #000; | |
| stroke-width: .5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| // From http://mkweb.bcgsc.ca/circos/guide/tables/ | |
| var matrix = [ | |
| // 16657, 586163, 54119, 112654, 185593, 586163, 570264, 19441, 843876 | |
| [0, 10020, 0, 22500, 0, 0, 0, 2500, 0], // 16657 | |
| [0, 0, 0, 0, 0, 0, 0, 0, 0], // 586163 | |
| [0, 0, 0, 0, 0, 0, 0, 0, 0], // 54119 | |
| [0, 0, 0, 0, 2500, 20000, 0, 0, 0], // 112654 | |
| [2487, 0, 0, 0, 0, 0, 0, 2478, 0], // 570264 | |
| [0, 0, 0, 0, 0, 0, 0, 0, 17500], // 185593 | |
| [0, 0, 0, 9988, 0, 0, 0, 0, 0], // 586163 | |
| [7500, 0, 0, 0, 0, 0, 0, 10000, 0], // 843876 | |
| ]; | |
| var chord = d3.layout.chord() | |
| .padding(.05) | |
| .sortSubgroups(d3.descending) | |
| .matrix(matrix); | |
| var width = 960, | |
| height = 500, | |
| innerRadius = Math.min(width, height) * .41, | |
| outerRadius = innerRadius * 1.1; | |
| var fill = d3.scale.ordinal() | |
| .domain(d3.range(4)) | |
| .range(["#000000", "#FFDD89", "#957244", "#F26223"]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"); | |
| svg.append("g").selectAll("path") | |
| .data(chord.groups) | |
| .enter().append("path") | |
| .style("fill", function(d) { return fill(d.index); }) | |
| .style("stroke", function(d) { return fill(d.index); }) | |
| .attr("d", d3.svg.arc().innerRadius(innerRadius).outerRadius(outerRadius)) | |
| .on("mouseover", fade(.1)) | |
| .on("mouseout", fade(1)); | |
| var ticks = svg.append("g").selectAll("g") | |
| .data(chord.groups) | |
| .enter().append("g").selectAll("g") | |
| .data(groupTicks) | |
| .enter().append("g") | |
| .attr("transform", function(d) { | |
| return "rotate(" + (d.angle * 180 / Math.PI - 90) + ")" | |
| + "translate(" + outerRadius + ",0)"; | |
| }); | |
| ticks.append("line") | |
| .attr("x1", 1) | |
| .attr("y1", 0) | |
| .attr("x2", 5) | |
| .attr("y2", 0) | |
| .style("stroke", "#000"); | |
| ticks.append("text") | |
| .attr("x", 8) | |
| .attr("dy", ".35em") | |
| .attr("transform", function(d) { return d.angle > Math.PI ? "rotate(180)translate(-16)" : null; }) | |
| .style("text-anchor", function(d) { return d.angle > Math.PI ? "end" : null; }) | |
| .text(function(d) { return d.label; }); | |
| svg.append("g") | |
| .attr("class", "chord") | |
| .selectAll("path") | |
| .data(chord.chords) | |
| .enter().append("path") | |
| .attr("d", d3.svg.chord().radius(innerRadius)) | |
| .style("fill", function(d) { return fill(d.target.index); }) | |
| .style("opacity", 1); | |
| // Returns an array of tick angles and labels, given a group. | |
| function groupTicks(d) { | |
| var k = (d.endAngle - d.startAngle) / d.value; | |
| return d3.range(0, d.value, 1000).map(function(v, i) { | |
| return { | |
| angle: v * k + d.startAngle, | |
| label: i % 5 ? null : v / 1000 + "k" | |
| }; | |
| }); | |
| } | |
| // Returns an event handler for fading a given chord group. | |
| function fade(opacity) { | |
| return function(g, i) { | |
| svg.selectAll(".chord path") | |
| .filter(function(d) { return d.source.index != i && d.target.index != i; }) | |
| .transition() | |
| .style("opacity", opacity); | |
| }; | |
| } | |
| </script> |
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