This variation of a force-directed graph uses intermediate nodes in links to create aesthetically-pleasing Bézier curves.
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Curved Links
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .node { | |
| stroke: #fff; | |
| stroke-width: 1.5px; | |
| } | |
| .link { | |
| fill: none; | |
| stroke: #bbb; | |
| } | |
| </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 simulation = d3.forceSimulation() | |
| .force("link", d3.forceLink().distance(10).strength(0.5)) | |
| .force("charge", d3.forceManyBody()) | |
| .force("center", d3.forceCenter(width / 2, height / 2)); | |
| d3.json("miserables.json", function(error, graph) { | |
| if (error) throw error; | |
| var nodes = graph.nodes, | |
| nodeById = d3.map(nodes, function(d) { return d.id; }), | |
| links = graph.links, | |
| bilinks = []; | |
| links.forEach(function(link) { | |
| var s = link.source = nodeById.get(link.source), | |
| t = link.target = nodeById.get(link.target), | |
| i = {}; // intermediate node | |
| nodes.push(i); | |
| links.push({source: s, target: i}, {source: i, target: t}); | |
| bilinks.push([s, i, t]); | |
| }); | |
| var link = svg.selectAll(".link") | |
| .data(bilinks) | |
| .enter().append("path") | |
| .attr("class", "link"); | |
| var node = svg.selectAll(".node") | |
| .data(nodes.filter(function(d) { return d.id; })) | |
| .enter().append("circle") | |
| .attr("class", "node") | |
| .attr("r", 5) | |
| .attr("fill", function(d) { return color(d.group); }) | |
| .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); | |
| simulation.force("link") | |
| .links(links); | |
| function ticked() { | |
| link.attr("d", positionLink); | |
| node.attr("transform", positionNode); | |
| } | |
| }); | |
| function positionLink(d) { | |
| return "M" + d[0].x + "," + d[0].y | |
| + "S" + d[1].x + "," + d[1].y | |
| + " " + d[2].x + "," + d[2].y; | |
| } | |
| function positionNode(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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| { | |
| "nodes": [{ | |
| "title": "Process Map Step 1", | |
| "id": 0, | |
| "x": 695, | |
| "y": 100, | |
| "eventTypeId": null | |
| }, { | |
| "title": "Process Map Step 2", | |
| "id": 1, | |
| "x": 770, | |
| "y": 271, | |
| "eventTypeId": null | |
| }, { | |
| "id": 2, | |
| "title": "", | |
| "x": 842, | |
| "y": 93, | |
| "eventTypeId": null | |
| }, { | |
| "id": 3, | |
| "title": "", | |
| "x": 769, | |
| "y": 447, | |
| "eventTypeId": null | |
| }], | |
| "links": [{ | |
| "source": 0, | |
| "target": 1 | |
| }, { | |
| "source": 2, | |
| "target": 1 | |
| }, { | |
| "source": 1, | |
| "target": 3 | |
| }] | |
| } |
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