Example of a Waffle Chart (or square pie chart) made with d3.js. More info of waffle charts on this post of eagereyes blog, of Robert Kosara: http://eagereyes.org/blog/2008/engaging-readers-with-square-pie-waffle-charts
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Waffle Chart
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| age | population | |
|---|---|---|
| <10 | 2704659 | |
| 10-20 | 4499890 | |
| 21-30 | 2159981 | |
| 31-40 | 3853788 | |
| 41-50 | 14106543 | |
| 51-60 | 8819342 | |
| 61-70 | 612463 | |
| 71-80 | 144320 | |
| 81-90 | 3730220 | |
| >90 | 5234961 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 18px Arial; | |
| } | |
| p { | |
| margin: 0; | |
| } | |
| #waffle { | |
| margin-bottom: 30px; | |
| } | |
| #legend { | |
| font: 13px Arial; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <div id="title"> | |
| <p>A measure, by age population</p> | |
| </div> | |
| <div id="waffle"> | |
| </div> | |
| <div id="legend"> | |
| </div> | |
| </body> | |
| <script> | |
| var total = 0; | |
| var width, | |
| height, | |
| widthSquares = 20, | |
| heightSquares = 5, | |
| squareSize = 25, | |
| squareValue = 0, | |
| gap = 1, | |
| theData = []; | |
| var color = d3.scale.category10(); | |
| d3.csv("data.csv", function(error, data) | |
| { | |
| //total | |
| total = d3.sum(data, function(d) { return d.population; }); | |
| //value of a square | |
| squareValue = total / (widthSquares*heightSquares); | |
| //remap data | |
| data.forEach(function(d, i) | |
| { | |
| d.population = +d.population; | |
| d.units = Math.floor(d.population/squareValue); | |
| theData = theData.concat( | |
| Array(d.units+1).join(1).split('').map(function() | |
| { | |
| return { squareValue:squareValue, | |
| units: d.units, | |
| population: d.population, | |
| groupIndex: i}; | |
| }) | |
| ); | |
| }); | |
| width = (squareSize*widthSquares) + widthSquares*gap + 25; | |
| height = (squareSize*heightSquares) + heightSquares*gap + 25; | |
| var waffle = d3.select("#waffle") | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .selectAll("div") | |
| .data(theData) | |
| .enter() | |
| .append("rect") | |
| .attr("width", squareSize) | |
| .attr("height", squareSize) | |
| .attr("fill", function(d) | |
| { | |
| return color(d.groupIndex); | |
| }) | |
| .attr("x", function(d, i) | |
| { | |
| //group n squares for column | |
| col = Math.floor(i/heightSquares); | |
| return (col*squareSize) + (col*gap); | |
| }) | |
| .attr("y", function(d, i) | |
| { | |
| row = i%heightSquares; | |
| return (heightSquares*squareSize) - ((row*squareSize) + (row*gap)) | |
| }) | |
| .append("title") | |
| .text(function (d,i) | |
| { | |
| return "Age range: " + data[d.groupIndex].age + " | " + d.population + " , " + d.units + "%" | |
| }); | |
| //add legend with categorical data | |
| var legend = d3.select("#legend") | |
| .append("svg") | |
| .attr('width', 300) | |
| .attr('height', 200) | |
| .append('g') | |
| .selectAll("div") | |
| .data(data) | |
| .enter() | |
| .append("g") | |
| .attr('transform', function(d,i){ return "translate(0," + i*20 + ")";}); | |
| legend.append("rect") | |
| .attr("width", 18) | |
| .attr("height", 18) | |
| .style("fill", function(d, i) { return color(i)}); | |
| legend.append("text") | |
| .attr("x", 25) | |
| .attr("y", 13) | |
| .text( function(d) { return d.age}); | |
| //add value of a unit square | |
| var legend2 = d3.select("#legend") | |
| .select('svg') | |
| .append('g') | |
| .attr('transform', "translate(100,0)"); | |
| legend2.append("text") | |
| .attr('y', '14') | |
| .attr('font-size', '18px') | |
| .text("Total: " + total) | |
| .attr("fill", "#444444"); | |
| }); | |
| </script> | |
| </html> |
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Nicely done!