This is supposed to be an answer to this question.
It combines this example with the use of invisible nodes.
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August 29, 2015 13:57
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Using Invisible Nodes
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .link { | |
| stroke: black; | |
| stroke-width: 2px; | |
| } | |
| .node { | |
| stroke: white; | |
| stroke-width: 2px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <script> | |
| var width = 960, height = 500, colors = d3.scale.category10(); | |
| var n = 200, | |
| k = 7, | |
| nodes = d3.range(n).map(function (num) { return {type: num % k, charge: -50} }), | |
| links = d3.range(1,n).map(function (a) { return {source: nodes[0], target: nodes[a]} }); | |
| nodes[0].fixed = true; | |
| nodes[0].x = 480; | |
| nodes[0].y = 250; | |
| var invisibleNodes = d3.range(k).map(function () { return {charge: -1000} }), | |
| invisibleLinks = invisibleNodes.map(function (a) { return {source: 0, target: a} }); | |
| var force = d3.layout.force() | |
| .size([width, height]) | |
| .nodes(nodes.concat(invisibleNodes)) | |
| .links(invisibleLinks) | |
| .charge(function (d) { return d.charge }) | |
| .on("tick", tick) | |
| .start(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svgLinks = svg.selectAll(".link").data(links) | |
| .enter().append("line") | |
| .attr("class", "link") | |
| svgNodes = svg.selectAll(".node").data(nodes) | |
| .enter().append("circle") | |
| .attr("class", "node") | |
| .attr("r", 8) | |
| .style("fill", function (d) { return colors(d.type) }) | |
| .call(force.drag); | |
| function tick(e) { | |
| var k = .3 * e.alpha; | |
| // Push nodes toward their designated focus. | |
| nodes.forEach(function(o, i) { | |
| o.y += (invisibleNodes[o.type].y - o.y) * k; | |
| o.x += (invisibleNodes[o.type].x - o.x) * k; | |
| }); | |
| svgNodes | |
| .attr("cx", function(d) { return d.x }) | |
| .attr("cy", function(d) { return d.y }); | |
| svgLinks | |
| .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 }); | |
| }; | |
| </script> |
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