A dendrogram is a node-link diagram that places leaf nodes of the tree at the same depth. In this example, the classes (leaf nodes) are aligned on the right edge, with the packages (internal nodes) to the left. Data shows the Flare class hierarchy, courtesy Jeff Heer.
Compare to this Cartesian layout.
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>Flare Dendrogram</title> | |
| <style> | |
| .node circle { | |
| fill: #fff; | |
| stroke: steelblue; | |
| stroke-width: 1.5px; | |
| } | |
| .node { | |
| font: 10px sans-serif; | |
| } | |
| .link { | |
| fill: none; | |
| stroke: #ccc; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <script> | |
| var radius = 960 / 2; | |
| var cluster = d3.layout.cluster() | |
| .size([360, radius - 120]); | |
| var diagonal = d3.svg.diagonal.radial() | |
| .projection(function(d) { return [d.y, d.x / 180 * Math.PI]; }); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", radius * 2) | |
| .attr("height", radius * 2) | |
| .append("g") | |
| .attr("transform", "translate(" + radius + "," + radius + ")"); | |
| d3.json("https://gist.githubusercontent.com/deenar/c16ac22e53165aad50d5/raw/7f5f4cb610ee3f299018c2058362603bb3519d0f/flare.json", function(error, root) { | |
| if (error) throw error; | |
| var nodes = cluster.nodes(root); | |
| var link = svg.selectAll("path.link") | |
| .data(cluster.links(nodes)) | |
| .enter().append("path") | |
| .attr("class", "link") | |
| .attr("d", diagonal); | |
| var node = svg.selectAll("g.node") | |
| .data(nodes) | |
| .enter().append("g") | |
| .attr("class", "node") | |
| .attr("transform", function(d) { return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")"; }) | |
| node.append("circle") | |
| .attr("r", 4.5); | |
| node.append("text") | |
| .attr("dy", ".31em") | |
| .attr("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; }) | |
| .attr("transform", function(d) { return d.x < 180 ? "translate(8)" : "rotate(180)translate(-8)"; }) | |
| .text(function(d) { return d.name; }); | |
| }); | |
| d3.select(self.frameElement).style("height", radius * 2 + "px"); | |
| </script> |
