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Force-Directed Tree
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| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/force-directed-tree |
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| { | |
| "nodes": [ | |
| {"name": "d3"}, | |
| {"name": "d3.svg"}, | |
| {"name": "d3.svg.area"}, | |
| {"name": "d3.svg.line"}, | |
| {"name": "d3.scale"}, | |
| {"name": "d3.scale.linear"}, | |
| {"name": "d3.scale.ordinal"} | |
| ], | |
| "links": [ | |
| {"source": 0, "target": 1}, | |
| {"source": 1, "target": 2}, | |
| {"source": 1, "target": 3}, | |
| {"source": 0, "target": 4}, | |
| {"source": 4, "target": 5}, | |
| {"source": 4, "target": 6} | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| circle { | |
| stroke-width: 1.5px; | |
| } | |
| line { | |
| stroke: #999; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500, | |
| radius = 6; | |
| var fill = d3.scale.category20(); | |
| var force = d3.layout.force() | |
| .charge(-120) | |
| .linkDistance(30) | |
| .size([width, height]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("graph.json", function(error, json) { | |
| if (error) throw error; | |
| var link = svg.selectAll("line") | |
| .data(json.links) | |
| .enter().append("line"); | |
| var node = svg.selectAll("circle") | |
| .data(json.nodes) | |
| .enter().append("circle") | |
| .attr("r", radius - .75) | |
| .style("fill", function(d) { return fill(d.group); }) | |
| .style("stroke", function(d) { return d3.rgb(fill(d.group)).darker(); }) | |
| .call(force.drag); | |
| force | |
| .nodes(json.nodes) | |
| .links(json.links) | |
| .on("tick", tick) | |
| .start(); | |
| function tick(e) { | |
| var k = 6 * e.alpha; | |
| // Push sources up and targets down to form a weak tree. | |
| link | |
| .each(function(d) { d.source.y -= k, d.target.y += k; }) | |
| .attr("x1", function(d) { return d.source.x; }) | |
| .attr("y1", function(d) { return d.source.y; }) | |
| .attr("x2", function(d) { return d.target.x; }) | |
| .attr("y2", function(d) { return d.target.y; }); | |
| node | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }); | |
| } | |
| }); | |
| </script> |
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