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<!DOCTYPE html> |
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<head> |
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<meta charset="utf-8"> |
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<script src="//d3js.org/d3.v4.min.js"></script> |
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<link href="//fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet" type="text/css"> |
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<style> |
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.link { |
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fill: none; |
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stroke: #4fb9b5; |
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} |
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.glow { |
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/* This trick adds a heavy white shadow around the text. */ |
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text-shadow: |
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-1px -1px 3px white, |
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-1px 1px 3px white, |
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1px -1px 3px white, |
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1px 1px 3px white; |
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} |
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text { |
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font-family: "Open Sans", sans-serif; |
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pointer-events: none; |
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} |
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</style> |
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</head> |
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<body> |
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<script> |
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var width = 960, |
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height = 950, |
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svg = d3.select("body").append("svg") |
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.attr("width", width) |
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.attr("height", height), |
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g = svg.append("g"), |
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cluster = d3.cluster() |
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.size([2 * Math.PI, width / 2 - 150]) |
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fontSize = d3.scaleSqrt() |
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.range([30, 7]); |
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svg.append("rect") |
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.attr("width", width) |
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.attr("height", height) |
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.style("fill", "none") |
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.style("pointer-events", "all") |
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.call(d3.zoom() |
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.scaleExtent([1 / 2, 4]) |
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.on("zoom", zoomed)); |
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function zoomed() { |
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g.attr("transform", d3.event.transform); |
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} |
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d3.json("countryHierarchy.json", function (data){ |
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var hierarchy = d3.hierarchy(data); |
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cluster(hierarchy); |
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var descendants = hierarchy.descendants(); |
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fontSize.domain(d3.extent(descendants, function (d){ return d.depth; })) |
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var link = g.selectAll(".link") |
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.data(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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if(d.parent === descendants[0]){ |
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return "M" + project(d.x, d.y) |
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+ " " + project(d.parent.x, d.parent.y); |
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} else { |
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return "M" + project(d.x, d.y) |
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+ "C" + project(d.x, (d.y + d.parent.y) / 2) |
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+ " " + project(d.parent.x, (d.y + d.parent.y) / 2) |
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+ " " + project(d.parent.x, d.parent.y); |
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} |
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}); |
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var node = g.selectAll(".node") |
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.data(descendants) |
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.enter().append("g") |
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.attr("transform", function(d) { |
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return "translate(" + project(d.x, d.y) + ")"; |
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}); |
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node.append("text") |
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.text(function (d){ |
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return d.data.data.id; |
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}) |
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.attr("font-size", function (d){ |
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return fontSize(d.depth) + "pt"; |
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}) |
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.attr("transform", function(d) { |
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var theta = -d.x / Math.PI * 180 + 90; |
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if(d.x > Math.PI){ |
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theta += 180; |
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} |
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if(d.depth !== 3 && Math.abs(theta) < 30){ |
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theta = 0; |
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} |
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if(d.depth > 1){ |
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return "rotate(" + theta + ")"; |
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} else { |
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return ""; |
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} |
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}) |
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.attr("text-anchor", function (d){ |
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if(d.depth === 3){ |
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return (d.x > Math.PI) ? "end" : "start"; |
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} else { |
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return "middle"; |
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} |
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}) |
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.attr("dx", function (d){ |
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if(d.depth === 3){ |
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return (d.x > Math.PI) ? "-2px" : "2px"; |
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} else { |
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return "0px"; |
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} |
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}) |
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.classed("glow", function (d){ |
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return d.depth !== 3; |
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}) |
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.attr("alignment-baseline", "central"); |
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}); |
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function project(theta, r){ |
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return [ |
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width / 2 + r * Math.sin(theta), |
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height / 2 + r * Math.cos(theta) + 4 |
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] |
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} |
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</script> |
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</body> |