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How-To: Update a Pie Chart (Part 2)
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Pie Chart</title> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?2.5.0"></script> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js?2.5.0"></script> | |
| <style type="text/css"> | |
| body { | |
| font: 10px sans-serif; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| var data1 = [53245, 28479, 19697, 24037, 40245], | |
| data2 = [200, 200, 200, 200, 200], | |
| data = data1; | |
| var w = 960, | |
| h = 500, | |
| r = Math.min(w, h) / 2, | |
| color = d3.scale.category20(), | |
| donut = d3.layout.pie().sort(null), | |
| arc = d3.svg.arc().innerRadius(r - 100).outerRadius(r - 20); | |
| var svg = d3.select("body").append("svg:svg") | |
| .attr("width", w) | |
| .attr("height", h) | |
| .append("svg:g") | |
| .attr("transform", "translate(" + w / 2 + "," + h / 2 + ")"); | |
| var arcs = svg.selectAll("path") | |
| .data(donut(data)) | |
| .enter().append("svg:path") | |
| .attr("fill", function(d, i) { return color(i); }) | |
| .attr("d", arc) | |
| .each(function(d) { this._current = d; }); | |
| d3.select(window).on("click", function() { | |
| data = data === data1 ? data2 : data1; // swap the data | |
| arcs = arcs.data(donut(data)); // recompute the angles and rebind the data | |
| arcs.transition().duration(750).attrTween("d", arcTween); // redraw the arcs | |
| }); | |
| // Store the currently-displayed angles in this._current. | |
| // Then, interpolate from this._current to the new angles. | |
| function arcTween(a) { | |
| console.log(this); | |
| console.log(this._current); | |
| var i = d3.interpolate(this._current, a); | |
| this._current = i(0); | |
| return function(t) { | |
| return arc(i(t)); | |
| }; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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