This example shows how to link nodes in a force-directed graph using a named identifier rather than a numeric index.
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March 13, 2023 22:04
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Link Nodes by Name
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| license: gpl-3.0 |
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| { | |
| "nodes": [ | |
| {"id": "red"}, | |
| {"id": "orange"}, | |
| {"id": "yellow"}, | |
| {"id": "green"}, | |
| {"id": "blue"}, | |
| {"id": "violet"} | |
| ], | |
| "links": [ | |
| {"source": "red", "target": "yellow"}, | |
| {"source": "red", "target": "blue"}, | |
| {"source": "red", "target": "green"} | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .node { | |
| stroke: #000; | |
| stroke-width: 1.5px; | |
| } | |
| .link { | |
| stroke: #999; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <svg width="960" height="500"></svg> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var simulation = d3.forceSimulation() | |
| .force("charge", d3.forceManyBody().strength(-200)) | |
| .force("link", d3.forceLink().id(function(d) { return d.id; }).distance(40)) | |
| .force("x", d3.forceX(width / 2)) | |
| .force("y", d3.forceY(height / 2)) | |
| .on("tick", ticked); | |
| var link = svg.selectAll(".link"), | |
| node = svg.selectAll(".node"); | |
| d3.json("graph.json", function(error, graph) { | |
| if (error) throw error; | |
| simulation.nodes(graph.nodes); | |
| simulation.force("link").links(graph.links); | |
| link = link | |
| .data(graph.links) | |
| .enter().append("line") | |
| .attr("class", "link"); | |
| node = node | |
| .data(graph.nodes) | |
| .enter().append("circle") | |
| .attr("class", "node") | |
| .attr("r", 6) | |
| .style("fill", function(d) { return d.id; }); | |
| }); | |
| function ticked() { | |
| link.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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