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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> /* set the CSS */ |
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.node circle { |
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fill: #fff; |
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stroke: steelblue; |
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stroke-width: 3px; |
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} |
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.node text { font: 12px sans-serif; } |
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.node--internal text { |
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text-shadow: 0 1px 0 #fff, 0 -1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff; |
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} |
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.link { |
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fill: none; |
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stroke: #ccc; |
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stroke-width: 2px; |
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} |
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</style> |
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<body> |
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<!-- load the d3.js library --> |
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<script src="https://d3js.org/d3.v4.min.js"></script> |
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<script> |
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// set the dimensions and margins of the diagram |
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var margin = {top: 20, right: 90, bottom: 30, left: 90}, |
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width = 660 - margin.left - margin.right, |
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height = 500 - margin.top - margin.bottom; |
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// declares a tree layout and assigns the size |
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var treemap = d3.tree() |
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.size([height, width]); |
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// load the external data |
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d3.json("treeData.json", function(error, treeData) { |
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if (error) throw error; |
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// assigns the data to a hierarchy using parent-child relationships |
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var nodes = d3.hierarchy(treeData, function(d) { |
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return d.children; |
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}); |
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// maps the node data to the tree layout |
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nodes = treemap(nodes); |
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// append the svg object to the body of the page |
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// appends a 'group' element to 'svg' |
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// moves the 'group' element to the top left margin |
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var svg = d3.select("body").append("svg") |
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.attr("width", width + margin.left + margin.right) |
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.attr("height", height + margin.top + margin.bottom), |
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g = svg.append("g") |
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.attr("transform", |
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"translate(" + margin.left + "," + margin.top + ")"); |
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// adds the links between the nodes |
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var link = g.selectAll(".link") |
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.data( nodes.descendants().slice(1)) |
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.enter().append("path") |
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.attr("class", "link") |
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.attr("d", function(d) { |
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return "M" + d.y + "," + d.x |
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+ "C" + (d.y + d.parent.y) / 2 + "," + d.x |
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+ " " + (d.y + d.parent.y) / 2 + "," + d.parent.x |
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+ " " + d.parent.y + "," + d.parent.x; |
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}); |
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// adds each node as a group |
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var node = g.selectAll(".node") |
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.data(nodes.descendants()) |
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.enter().append("g") |
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.attr("class", function(d) { |
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return "node" + |
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(d.children ? " node--internal" : " node--leaf"); }) |
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.attr("transform", function(d) { |
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return "translate(" + d.y + "," + d.x + ")"; }); |
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// adds the circle to the node |
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node.append("circle") |
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.attr("r", 10); |
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// adds the text to the node |
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node.append("text") |
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.attr("dy", ".35em") |
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.attr("x", function(d) { return d.children ? -13 : 13; }) |
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.style("text-anchor", function(d) { |
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return d.children ? "end" : "start"; }) |
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.text(function(d) { return d.data.name; }); |
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}); |
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</script> |
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</body> |
