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force layout with multiple links between nodes
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.5.0/lodash.min.js"></script> | |
| <script src="https://d3js.org/d3.v3.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| path { | |
| fill: none; | |
| stroke-width: 3; | |
| } | |
| circle { | |
| stroke: white; | |
| stroke-width: 2; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| // DATA | |
| var nodes = [{}, {}, {}, {}, {}, {}, {}]; | |
| var links = [ | |
| // one link | |
| { source: 0, target: 1 }, | |
| // two links | |
| { source: 1, target: 2 }, | |
| { source: 1, target: 2 }, | |
| // three links | |
| { source: 2, target: 3 }, | |
| { source: 2, target: 3 }, | |
| { source: 2, target: 3 }, | |
| // four links | |
| { source: 3, target: 4 }, | |
| { source: 3, target: 4 }, | |
| { source: 3, target: 4 }, | |
| { source: 3, target: 4 }, | |
| // five links | |
| { source: 4, target: 5 }, | |
| { source: 4, target: 5 }, | |
| { source: 4, target: 5 }, | |
| { source: 4, target: 5 }, | |
| { source: 4, target: 5 }, | |
| // twenty links | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 }, | |
| { source: 5, target: 6 } | |
| ]; | |
| // DATA FORMATTING | |
| _.each(links, function(link) { | |
| // find other links with same target+source or source+target | |
| var same = _.where(links, { | |
| 'source': link.source, | |
| 'target': link.target | |
| }); | |
| var sameAlt = _.where(links, { | |
| 'source': link.target, | |
| 'target': link.source | |
| }); | |
| var sameAll = same.concat(sameAlt); | |
| _.each(sameAll, function(s, i) { | |
| s.sameIndex = (i + 1); | |
| s.sameTotal = sameAll.length; | |
| s.sameTotalHalf = (s.sameTotal / 2); | |
| s.sameUneven = ((s.sameTotal % 2) !== 0); | |
| s.sameMiddleLink = ((s.sameUneven === true) && (Math.ceil(s.sameTotalHalf) === s.sameIndex)); | |
| s.sameLowerHalf = (s.sameIndex <= s.sameTotalHalf); | |
| s.sameArcDirection = s.sameLowerHalf ? 0 : 1; | |
| s.sameIndexCorrected = s.sameLowerHalf ? s.sameIndex : (s.sameIndex - Math.ceil(s.sameTotalHalf)); | |
| }); | |
| }); | |
| var maxSame = _.chain(links) | |
| .sortBy(function(x) { | |
| return x.sameTotal; | |
| }) | |
| .last() | |
| .value().sameTotal; | |
| _.each(links, function(link) { | |
| link.maxSameHalf = Math.floor(maxSame / 3); | |
| }); | |
| // FORCE | |
| var width = 960, | |
| height = 500; | |
| var force = d3.layout.force() | |
| .nodes(nodes) | |
| .links(links) | |
| .size([width, height]) | |
| .linkDistance(100) | |
| .charge(-200) | |
| .on('tick', tick) | |
| .start(); | |
| // for a static force uncomment the following | |
| // for ( var i = (nodes.length * nodes.length * nodes.length); i > 0; --i ) { | |
| // force.tick(); | |
| // } | |
| // force.stop(); | |
| // RENDER | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var path = svg.append("g").selectAll("path") | |
| .data(force.links()) | |
| .enter().append("path") | |
| .style("stroke", function(d) { | |
| return d3.scale.category20().range()[d.sameIndex - 1]; | |
| }); | |
| var circle = svg.append("g").selectAll("circle") | |
| .data(force.nodes()) | |
| .enter().append("circle") | |
| .attr("r", 8) | |
| .call(force.drag); | |
| // TICK | |
| function tick(d) { | |
| circle.attr("transform", function(d) { | |
| return "translate(" + d.x + "," + d.y + ")"; | |
| }); | |
| path.attr("d", linkArc); | |
| } | |
| // ARC CALCULATION | |
| // some more info: http://stackoverflow.com/questions/11368339/drawing-multiple-edges-between-two-nodes-with-d3 | |
| function linkArc(d) { | |
| var dx = (d.target.x - d.source.x), | |
| dy = (d.target.y - d.source.y), | |
| dr = Math.sqrt(dx * dx + dy * dy), | |
| unevenCorrection = (d.sameUneven ? 0 : 0.5), | |
| arc = ((dr * d.maxSameHalf) / (d.sameIndexCorrected - unevenCorrection)); | |
| if (d.sameMiddleLink) { | |
| arc = 0; | |
| } | |
| return "M" + d.source.x + "," + d.source.y + "A" + arc + "," + arc + " 0 0," + d.sameArcDirection + " " + d.target.x + "," + d.target.y; | |
| } | |
| </script> | |
| </body> |
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