This demonstrates how to produce a static force-directed graph layout with d3-force. Rather than updating the graph with each tick, we run the graph a fixed number of times, and then display it once. To avoid freezing the user interface, it may be desirable to compute the force-directed layout in a web worker.
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Static Force Layout + dragging
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <svg width="960" height="500"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"), | |
| g = svg.append("g").attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"); | |
| var n = 100, | |
| nodes = d3.range(n).map(function(i) { return {index: i}; }), | |
| links = d3.range(n).map(function(i) { return {source: i, target: (i + 3) % n}; }); | |
| var simulation = d3.forceSimulation(nodes) | |
| .force("charge", d3.forceManyBody().strength(-80)) | |
| .force("link", d3.forceLink(links).distance(20).strength(1).iterations(10)) | |
| .force("x", d3.forceX()) | |
| .force("y", d3.forceY()) | |
| .stop(); | |
| var loading = svg.append("text") | |
| .attr("dy", "0.35em") | |
| .attr("text-anchor", "middle") | |
| .attr("font-family", "sans-serif") | |
| .attr("font-size", 10) | |
| .text("Simulating. One moment please…"); | |
| var dragstarted = function(d) { | |
| if (!d3.event.active) { | |
| simulation.alpha(.5); | |
| simulation.alphaTarget(0.1).restart(); | |
| } | |
| d.fx = d.x; | |
| d.fy = d.y; | |
| } | |
| var dragged = function (d) { | |
| d.fx = d3.event.x; | |
| d.fy = d3.event.y; | |
| } | |
| var dragended = function(d) { | |
| if (!d3.event.active) simulation.alphaTarget(0.0001); | |
| d.fx = null; | |
| d.fy = null; | |
| } | |
| var ticked = function() { | |
| g.selectAll("line") | |
| .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; }); | |
| g.selectAll('circle') | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }) | |
| console.log(simulation.alpha()); | |
| } | |
| // Use a timeout to allow the rest of the page to load first. | |
| d3.timeout(function() { | |
| loading.remove(); | |
| // See https://github.com/d3/d3-force/blob/master/README.md#simulation_tick | |
| for (var i = 0, n = Math.ceil(Math.log(simulation.alphaMin()) / Math.log(1 - simulation.alphaDecay())); i < n; ++i) { | |
| simulation.tick(); | |
| } | |
| g.append("g") | |
| .attr("stroke", "#000") | |
| .attr("stroke-width", 1.5) | |
| .selectAll("line") | |
| .data(links) | |
| .enter().append("line") | |
| .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; }); | |
| g.append("g") | |
| .attr("stroke", "#fff") | |
| .attr("stroke-width", 1.5) | |
| .selectAll("circle") | |
| .data(nodes) | |
| .enter().append("circle") | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }) | |
| .attr("r", 4.5) | |
| .call(d3.drag() | |
| .on("start", dragstarted) | |
| .on("drag", dragged) | |
| .on("end", dragended) | |
| ); | |
| simulation.on("tick", ticked); | |
| }); | |
| </script> |
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