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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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.link { |
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stroke: #000; |
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stroke-width: 1.5px; |
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} |
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.node { |
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fill: #000; |
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stroke: #fff; |
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stroke-width: 1.5px; |
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} |
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</style> |
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<body> |
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<script src="http://d3js.org/d3.v3.min.js"></script> |
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<script> |
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var width = 960, |
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height = 500, |
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linkDistance = 120; |
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var color = d3.scale.category10(); |
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var idGenerator = 0; |
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var nodes = [ { id: idGenerator++, x: width / 2, y: height / 2 } ], |
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links = []; |
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var force = d3.layout.force() |
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.nodes(nodes) |
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.links(links) |
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.charge(-400) |
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.linkDistance(linkDistance) |
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.size([width, height]) |
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.on("tick", tick); |
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var svg = d3.select("body").append("svg") |
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.attr("width", width) |
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.attr("height", height); |
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start(); |
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function expandChildren(source) { |
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force.stop(); |
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var newLinks = []; |
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var childCount = 10; |
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for ( var i = 0; i < childCount; i++ ) |
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{ |
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var target = { |
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id: idGenerator++, |
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x: source.x + linkDistance * Math.sin( 2 * Math.PI * i / childCount ), |
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y: source.y + linkDistance * Math.cos( 2 * Math.PI * i / childCount ) |
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}; |
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var newLink = { |
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source: source, |
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target: target |
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}; |
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newLinks.push( newLink ); |
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} |
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svg.selectAll("circle.node") |
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.data(newLinks.map( function(d) { return d.target; } ), function(d) { return d.id; } ) |
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.enter() |
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.append("circle") |
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.attr("class", "node new") |
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.attr("r", 8) |
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.attr("cx", source.x ) |
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.attr("cy", source.y ); |
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svg.selectAll(".link") |
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.data(newLinks, function(d) { return d.source.id + "-" + d.target.id; } ) |
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.enter() |
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.insert("line", ".node" ) |
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.attr("class", "link" ) |
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.attr("x1", function(d) { return d.source.x; } ) |
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.attr("y1", function(d) { return d.source.y; } ) |
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.attr("x2", function(d) { return d.source.x; } ) |
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.attr("y2", function(d) { return d.source.y; } ); |
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var transition = svg.transition() |
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.duration(1000); |
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transition.selectAll("circle.node") |
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.attr("cx", function(d) { return d.x; } ) |
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.attr("cy", function(d) { return d.y; } ); |
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transition.selectAll("line.link") |
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.attr("x2", function(d) { return d.target.x; }) |
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.attr("y2", function(d) { return d.target.y; }); |
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transition |
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.each("end", function() { |
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for ( var i = 0; i < newLinks.length; i++ ) |
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{ |
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var link = newLinks[i]; |
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nodes.push( link.target ); |
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links.push( link ); |
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} |
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start(); |
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svg.selectAll(".node").on("click", expandChildren); |
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} ); |
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} |
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svg.selectAll(".node").on("click", expandChildren); |
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function start() { |
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var node = svg.selectAll(".node") |
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.data(force.nodes(), function(d) { return d.id;}); |
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node.enter() |
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.append("circle") |
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.attr("class", "node") |
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.attr("r", 8); |
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node.exit().remove(); |
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var link = svg.selectAll(".link") |
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.data(force.links(), function(d) { return d.source.id + "-" + d.target.id; }); |
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link.enter() |
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.insert("line", ".node") |
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.attr("class", "link"); |
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link.exit().remove(); |
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force.start(); |
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} |
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function tick() { |
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svg.selectAll(".node") |
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.attr("cx", function(d) { return d.x; }) |
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.attr("cy", function(d) { return d.y; }) |
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svg.selectAll(".link") |
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.attr("x1", function(d) { return d.source.x; }) |
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.attr("y1", function(d) { return d.source.y; }) |
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.attr("x2", function(d) { return d.target.x; }) |
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.attr("y2", function(d) { return d.target.y; }); |
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} |
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</script> |
