Example showing how to use multiple sets of multiple foci and toggle between them. Uses d3v4. Based on the answer to this question/answer (v3) on stack overflow and on the canonical force layout by Mike Bostock.
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April 18, 2018 04:14
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D3.force, multiple sets of multiple foci
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .links line { | |
| stroke: #999; | |
| stroke-opacity: 0.6; | |
| } | |
| .nodes circle { | |
| stroke: #fff; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <svg width="960" height="600"></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"); | |
| var color = d3.scaleOrdinal(d3.schemeCategory20); | |
| var nodes = d3.range(100).map(function() { | |
| var node = {}; | |
| node.groupA = Math.floor(Math.random()*5); | |
| node.groupB = Math.floor(Math.random()*2); | |
| return node; | |
| }) | |
| var fociA = [{x:200,y:250},{x:350,y:250},{x:500,y:250},{x:650,y:250},{x:800,y:250}] | |
| var fociB = [{x:400,y:100},{x:600,y:300}]; | |
| var simulation = d3.forceSimulation() | |
| .force("link", d3.forceLink().id(function(d) { return d.id; })) | |
| .force("charge", d3.forceManyBody()) | |
| .force("center", d3.forceCenter(width / 2, height / 2)); | |
| var node = svg.append("g") | |
| .attr("class", "nodes") | |
| .selectAll("circle") | |
| .data(nodes) | |
| .enter().append("circle") | |
| .attr("r", 5) | |
| .attr("fill", function(d) { return color(d.groupA); }) | |
| .call(d3.drag() | |
| .on("start", dragstarted) | |
| .on("drag", dragged) | |
| .on("end", dragended)); | |
| node.append("title") | |
| .text(function(d) { return d.id; }); | |
| simulation | |
| .nodes(nodes) | |
| .on("tick", ticked); | |
| var current = "groupA"; | |
| var buttons = svg.selectAll(null) | |
| .data(["groupA","groupB"]) | |
| .enter() | |
| .append("g") | |
| .attr("transform",function(d,i) { return "translate("+(i*120+50)+","+50+")"; }) | |
| .on("click", function(d) { | |
| if(d != current) { | |
| current = d; | |
| simulation.alpha(0.228); | |
| simulation.restart(); | |
| } | |
| }) | |
| .style("cursor","pointer") | |
| buttons.append("rect") | |
| .attr("width",100) | |
| .attr("height",50) | |
| .attr("fill","lightgrey") | |
| buttons.append("text") | |
| .text(function(d) { return d; }) | |
| .attr("dy", 30) | |
| .attr("dx", 50) | |
| .style("text-anchor","middle"); | |
| function ticked() { | |
| var k = this.alpha() * 0.3; | |
| // nudge nodes to proper foci: | |
| if(current == "groupA" ) { | |
| nodes.forEach(function(n, i) { | |
| n.y += (fociA[n.groupA].y - n.y) * k; | |
| n.x += (fociA[n.groupA].x - n.x) * k; | |
| }); | |
| } | |
| else { | |
| nodes.forEach(function(n, i) { | |
| n.y += (fociB[n.groupB].y - n.y) * k; | |
| n.x += (fociB[n.groupB].x - n.x) * k; | |
| }); | |
| } | |
| node | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return 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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