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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<title>Streamgraph</title> |
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<style> |
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body { |
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font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; |
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margin: auto; |
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position: relative; |
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width: 960px; |
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} |
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button { |
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position: absolute; |
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right: 10px; |
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top: 10px; |
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} |
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</style> |
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<button onclick="transition()">Update</button> |
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<script src="//d3js.org/d3.v3.min.js"></script> |
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<script> |
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var n = 20, // number of layers |
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m = 200, // number of samples per layer |
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stack = d3.layout.stack().offset("wiggle"), |
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layers0 = stack(d3.range(n).map(function() { return bumpLayer(m); })), |
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layers1 = stack(d3.range(n).map(function() { return bumpLayer(m); })); |
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var width = 960, |
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height = 500; |
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var x = d3.scale.linear() |
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.domain([0, m - 1]) |
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.range([0, width]); |
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var y = d3.scale.linear() |
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.domain([0, d3.max(layers0.concat(layers1), function(layer) { return d3.max(layer, function(d) { return d.y0 + d.y; }); })]) |
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.range([height, 0]); |
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var color = d3.scale.linear() |
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.range(["#aad", "#556"]); |
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var area = d3.svg.area() |
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.x(function(d) { return x(d.x); }) |
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.y0(function(d) { return y(d.y0); }) |
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.y1(function(d) { return y(d.y0 + d.y); }); |
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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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svg.selectAll("path") |
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.data(layers0) |
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.enter().append("path") |
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.attr("d", area) |
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.style("fill", function() { return color(Math.random()); }); |
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function transition() { |
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d3.selectAll("path") |
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.data(function() { |
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var d = layers1; |
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layers1 = layers0; |
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return layers0 = d; |
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}) |
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.transition() |
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.duration(2500) |
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.attr("d", area); |
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} |
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// Inspired by Lee Byron's test data generator. |
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function bumpLayer(n) { |
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function bump(a) { |
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var x = 1 / (.1 + Math.random()), |
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y = 2 * Math.random() - .5, |
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z = 10 / (.1 + Math.random()); |
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for (var i = 0; i < n; i++) { |
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var w = (i / n - y) * z; |
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a[i] += x * Math.exp(-w * w); |
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} |
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} |
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var a = [], i; |
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for (i = 0; i < n; ++i) a[i] = 0; |
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for (i = 0; i < 5; ++i) bump(a); |
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return a.map(function(d, i) { return {x: i, y: Math.max(0, d)}; }); |
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} |
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</script> |
