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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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button { |
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position: absolute; |
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left: 10px; |
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top: 10px; |
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} |
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h3::after |
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{ |
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transform:"translate(20,5)" |
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} |
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</style> |
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<button onclick="transition()">Update</button> |
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<h3>SalesLog</h3> |
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<svg width="960" height="500"></svg> |
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<script src="https://d3js.org/d3.v4.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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k = 10; // number of bumps per layer |
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var stack = d3.stack().keys(d3.range(n)).offset(d3.stackOffsetWiggle), |
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layers0 = stack(d3.transpose(d3.range(n).map(function() { return bumps(m, k); }))), |
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layers1 = stack(d3.transpose(d3.range(n).map(function() { return bumps(m, k); }))), |
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layers = layers0.concat(layers1); |
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var svg = d3.select("svg"), |
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width = +svg.attr("width"), |
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height = +svg.attr("height"); |
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var x = d3.scaleLinear() |
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.domain([0, m - 1]) |
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.range([0, width]); |
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var y = d3.scaleLinear() |
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.domain([d3.min(layers, stackMin), d3.max(layers, stackMax)]) |
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.range([height, 0]); |
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var z = d3.interpolateCool; |
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var area = d3.area() |
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.x(function(d, i) { return x(i); }) |
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.y0(function(d) { return y(d[0]); }) |
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.y1(function(d) { return y(d[1]); }); |
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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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.attr("fill", function() { return z(Math.random()); }); |
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function stackMax(layer) { |
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return d3.max(layer, function(d) { return d[1]; }); |
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} |
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function stackMin(layer) { |
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return d3.min(layer, function(d) { return d[0]; }); |
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} |
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function transition() { |
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var t; |
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d3.selectAll("path") |
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.data((t = layers1, layers1 = layers0, layers0 = t)) |
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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 bumps(n, m) { |
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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 < m; ++i) bump(a, n); |
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return a; |
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} |
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function bump(a, n) { |
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var x = 1 / (0.1 + Math.random()), |
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y = 2 * Math.random() - 0.5, |
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z = 10 / (0.1 + 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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</script> |