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118 lines
3.7 KiB
118 lines
3.7 KiB
/* ------------------------------------------------------------------------------ |
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* |
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* # D3.js - multiple nested pie charts |
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* |
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* Demo d3.js multiple pie charts setup with nesting |
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* |
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* Version: 1.0 |
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* Latest update: August 1, 2015 |
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* |
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* ---------------------------------------------------------------------------- */ |
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$(function () { |
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// Initialize chart |
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pieMultipleNested('#d3-pie-nesting', 110, 10); |
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// Chart setup |
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function pieMultipleNested(element, radius, margin) { |
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// Basic setup |
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// ------------------------------ |
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// Main variables |
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var marginTop = 20; |
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// Colors |
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var colors = d3.scale.category20c(); |
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// Load data |
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// ------------------------------ |
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d3.csv("assets/demo_data/d3/pies/pies_nesting.csv", function(flights) { |
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// Nest the flight data by originating airport |
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var airports = d3.nest() |
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.key(function(d) { return d.origin; }) |
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.entries(flights); |
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// Create chart |
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// ------------------------------ |
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// Insert an svg element (with margin) for each row in our dataset |
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var svg = d3.select(element) |
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.selectAll("svg") |
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.data(airports) |
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.enter() |
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.append("svg") |
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.attr("width", (radius + margin) * 2) |
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.attr("height", (radius + margin + marginTop) * 2) |
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.append("g") |
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.attr("transform", "translate(" + (radius + margin) + "," + (radius + margin + marginTop) + ")"); |
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// Construct chart layout |
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// ------------------------------ |
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// Arc |
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var arc = d3.svg.arc() |
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.innerRadius(0) |
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.outerRadius(radius); |
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// Pie |
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var pie = d3.layout.pie() |
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.value(function(d) { return +d.count; }) |
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.sort(function(a, b) { return b.count - a.count; }); |
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// |
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// Append chart elements |
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// |
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// Add a label for the airport |
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svg.append("text") |
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.attr("dy", ".35em") |
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.attr("y", -130) |
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.style("text-anchor", "middle") |
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.style("font-weight", 500) |
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.text(function(d) { return d.key; }); |
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// Pass the nested values to the pie layout |
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var g = svg.selectAll("g") |
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.data(function(d) { return pie(d.values); }) |
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.enter() |
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.append("g") |
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.attr("class", "d3-arc"); |
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// Add a colored arc path, with a mouseover title showing the count |
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g.append("path") |
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.attr("d", arc) |
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.style("stroke", "#fff") |
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.style("fill", function(d) { return colors(d.data.carrier); }) |
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.append("title") |
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.text(function(d) { return d.data.carrier + ": " + d.data.count; }); |
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// Add a label to the larger arcs, translated to the arc centroid and rotated |
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g.filter(function(d) { return d.endAngle - d.startAngle > .2; }).append("text") |
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.attr("dy", ".35em") |
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.attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")rotate(" + angle(d) + ")"; }) |
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.style("fill", "#fff") |
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.style("font-size", 12) |
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.style("text-anchor", "middle") |
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.text(function(d) { return d.data.carrier; }); |
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// Computes the label angle of an arc, converting from radians to degrees |
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function angle(d) { |
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var a = (d.startAngle + d.endAngle) * 90 / Math.PI - 90; |
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return a > 90 ? a - 180 : a; |
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} |
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}); |
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} |
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});
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