An example of multiple pie (donut) charts created with D3. The data is represented as a two-dimensional array of numbers; each row in the array is mapped to a pie chart. Thus, each pie represents the relative value of a number (such as 1,013) within its rows. Note that in this dataset, the totals for each row are not equal.
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February 20, 2016 05:53
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Pie Multiples
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| text-align: center; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| // Define the data as a two-dimensional array of numbers. If you had other | |
| // data to associate with each number, replace each number with an object, e.g., | |
| // `{key: "value"}`. | |
| var data = [ | |
| [11975, 5871, 8916, 2868], | |
| [ 1951, 10048, 2060, 6171], | |
| [ 8010, 16145, 8090, 8045], | |
| [ 1013, 990, 940, 6907] | |
| ]; | |
| // Define the margin, radius, and color scale. The color scale will be | |
| // assigned by index, but if you define your data using objects, you could pass | |
| // in a named field from the data object instead, such as `d.name`. Colors | |
| // are assigned lazily, so if you want deterministic behavior, define a domain | |
| // for the color scale. | |
| var m = 10, | |
| r = 100, | |
| z = d3.scale.category20c(); | |
| // Insert an svg element (with margin) for each row in our dataset. A child g | |
| // element translates the origin to the pie center. | |
| var svg = d3.select("body").selectAll("svg") | |
| .data(data) | |
| .enter().append("svg") | |
| .attr("width", (r + m) * 2) | |
| .attr("height", (r + m) * 2) | |
| .append("g") | |
| .attr("transform", "translate(" + (r + m) + "," + (r + m) + ")"); | |
| // The data for each svg element is a row of numbers (an array). We pass that to | |
| // d3.layout.pie to compute the angles for each arc. These start and end angles | |
| // are passed to d3.svg.arc to draw arcs! Note that the arc radius is specified | |
| // on the arc, not the layout. | |
| svg.selectAll("path") | |
| .data(d3.layout.pie()) | |
| .enter().append("path") | |
| .attr("d", d3.svg.arc() | |
| .innerRadius(r / 2) | |
| .outerRadius(r)) | |
| .style("fill", function(d, i) { return z(i); }); | |
| </script> |
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