This variation of a force-directed graph uses intermediate nodes in links to create aesthetically-pleasing Bézier curves.
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Curved Links
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .node { | |
| stroke: #fff; | |
| stroke-width: 1.5px; | |
| } | |
| .link { | |
| fill: none; | |
| stroke: #bbb; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var color = d3.scale.category20(); | |
| var force = d3.layout.force() | |
| .linkDistance(10) | |
| .linkStrength(2) | |
| .size([width, height]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("/mbostock/raw/4062045/miserables.json", function(error, graph) { | |
| if (error) throw error; | |
| var nodes = graph.nodes.slice(), | |
| links = [], | |
| bilinks = []; | |
| graph.links.forEach(function(link) { | |
| var s = nodes[link.source], | |
| t = nodes[link.target], | |
| i = {}; // intermediate node | |
| nodes.push(i); | |
| links.push({source: s, target: i}, {source: i, target: t}); | |
| bilinks.push([s, i, t]); | |
| }); | |
| force | |
| .nodes(nodes) | |
| .links(links) | |
| .start(); | |
| var link = svg.selectAll(".link") | |
| .data(bilinks) | |
| .enter().append("path") | |
| .attr("class", "link"); | |
| var node = svg.selectAll(".node") | |
| .data(graph.nodes) | |
| .enter().append("circle") | |
| .attr("class", "node") | |
| .attr("r", 5) | |
| .style("fill", function(d) { return color(d.group); }) | |
| .call(force.drag); | |
| node.append("title") | |
| .text(function(d) { return d.name; }); | |
| force.on("tick", function() { | |
| link.attr("d", function(d) { | |
| return "M" + d[0].x + "," + d[0].y | |
| + "S" + d[1].x + "," + d[1].y | |
| + " " + d[2].x + "," + d[2].y; | |
| }); | |
| node.attr("transform", function(d) { | |
| return "translate(" + d.x + "," + d.y + ")"; | |
| }); | |
| }); | |
| }); | |
| </script> |
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