Click anywhere to generate a new random graph.
- The nodes are colored by the number of their neighbors.
- Nodes with higher number of neighbours are bigger.
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Save blackhalt/3777f161e43fb4bbe4bfb762e6967efe to your computer and use it in GitHub Desktop.
Random Graph Generator
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .link {stroke: black;} | |
| .node {stroke: white; stroke-width: 3px;} | |
| </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 = 20, // number of nodes | |
| m = 22, // number of links | |
| charge = -1000; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mousedown", create); | |
| create(); | |
| function create () { | |
| svg.selectAll(".link, .node").remove(); | |
| randomGraph(n, m, charge); | |
| } | |
| function randomGraph (n, m, charge) { //creates a random graph on n nodes and m links | |
| var nodes = d3.range(n).map(Object), | |
| list = randomChoose(unorderedPairs(d3.range(n)), m), | |
| links = list.map(function (a) { return {source: a[0], target: a[1]} }); | |
| var force = d3.layout.force() | |
| .size([width, height]) | |
| .nodes(nodes) | |
| .links(links) | |
| .charge(charge) | |
| .on("tick", tick) | |
| .start(); | |
| var svgLinks = svg.selectAll(".link").data(links) | |
| .enter().append("line") | |
| .attr("class", "link"); | |
| var svgNodes = svg.selectAll(".node").data(nodes) | |
| .enter().append("circle") | |
| .attr("class", "node") | |
| .attr("r", 3) | |
| .style("fill", "white"); | |
| svgNodes.transition().duration(800) | |
| .attr("r", function (d) { return 3 + 3 * d.weight }) | |
| .style("fill", function (d) { return colors(d.weight) }); | |
| svgLinks.transition().duration(800) | |
| .style("stroke-width", 3); | |
| function tick () { | |
| 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 }); | |
| } | |
| } | |
| function randomChoose (s, k) { // returns a random k element subset of s | |
| var a = [], i = -1, j; | |
| while (++i < k) { | |
| j = Math.floor(Math.random() * s.length); | |
| a.push(s.splice(j, 1)[0]); | |
| }; | |
| return a; | |
| } | |
| function unorderedPairs (s) { // returns the list of all unordered pairs from s | |
| var i = -1, a = [], j; | |
| while (++i < s.length) { | |
| j = i; | |
| while (++j < s.length) a.push([s[i],s[j]]) | |
| }; | |
| return a; | |
| } | |
| </script> |
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