Created
May 5, 2017 02:09
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D3 Force Directed Graph Layout
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| <!DOCTYPE html> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| .link line {stroke: black;} | |
| .node circle {stroke: black; fill: white;} | |
| .node text {text-anchor: middle; font-size: 20px} | |
| </style> | |
| <svg width="300" height="300"></svg> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var simulation = d3.forceSimulation() | |
| .force("link", d3.forceLink().distance(75) | |
| .id(function(d) { return d.value;})) | |
| .force("charge", d3.forceManyBody()) | |
| .force("center", d3.forceCenter(width / 2, height / 2)); | |
| var nodes = [ | |
| {"value": 4}, | |
| {"value": 8}, | |
| {"value": 15}, | |
| {"value": 16}, | |
| {"value": 23}, | |
| {"value": 42} | |
| ]; | |
| simulation.nodes(nodes) | |
| var links = [ | |
| {"source": 8, "target": 4}, | |
| {"source": 16, "target": 4}, | |
| {"source": 16, "target": 8}, | |
| {"source": 23, "target": 8}, | |
| {"source": 23, "target": 15}, | |
| {"source": 42, "target": 4}, | |
| {"source": 42, "target": 15}, | |
| {"source": 42, "target": 23} | |
| ]; | |
| simulation.force("link").links(links); | |
| var linksel = svg.append("g") | |
| .attr("class", "link") | |
| .selectAll("line").data(links).enter().append("line") | |
| var nodesel = svg.selectAll(".node") | |
| .data(nodes) | |
| .enter().append("g") | |
| .attr("class", "node") | |
| .call(d3.drag() | |
| .on("start", dragstarted) | |
| .on("drag", dragged) | |
| .on("end", dragended)); | |
| nodesel.append("circle") | |
| .attr("r",20); | |
| nodesel.append("text") | |
| .attr("transform","translate(0,6)") | |
| .text(function (d) { return d.value; }); | |
| // replace "tick" with "end" for static layout | |
| simulation.on("tick", ticked); | |
| function ticked() { | |
| linksel.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; }); | |
| nodesel.attr("transform", function(d) { | |
| return "translate(" + d.x + "," + d.y + ")"; | |
| }); | |
| } | |
| function dragstarted(d) { | |
| if (!d3.event.active) simulation.alphaTarget(0.3).restart(); | |
| d.fx = d.x; | |
| d.fy = d.y; | |
| } | |
| function dragged(d) { | |
| d.fx = d3.event.x; | |
| d.fy = d3.event.y; | |
| } | |
| function dragended(d) { | |
| if (!d3.event.active) simulation.alphaTarget(0); | |
| d.fx = null; | |
| d.fy = null; | |
| } | |
| </script> |
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