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