A polar area diagram of world religions with a color legend. This is similar to a pie chart, but with constant angles, varying area proportional to data. This is example 29 from the screencast Splitting Charts.
forked from curran's block: Religions Pie Chart
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>D3 Example</title> | |
| <script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <script src="//cdnjs.cloudflare.com/ajax/libs/d3-legend/1.1.0/d3-legend.js"></script> | |
| <link href='https://fonts.googleapis.com/css?family=Open+Sans' rel='stylesheet' type='text/css'> | |
| <style> | |
| .axis text { | |
| font-family: 'Open Sans', sans-serif; | |
| font-size: 32pt; | |
| } | |
| .axis path, .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .color-legend text { | |
| font-family: 'Open Sans', sans-serif; | |
| font-size: 29pt; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var outerWidth = 960; | |
| var outerHeight = 500; | |
| var margin = { left: 11, top: 75, right: 377, bottom: 88 }; | |
| var radiusMax = 231; | |
| var xColumn = "name"; | |
| var colorColumn = "religion"; | |
| var radiusColumn = "population"; | |
| var innerWidth = outerWidth - margin.left - margin.right; | |
| var innerHeight = outerHeight - margin.top - margin.bottom; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", outerWidth) | |
| .attr("height", outerHeight); | |
| var g = svg.append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| var xAxisG = g.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + innerHeight + ")"); | |
| var pieG = g.append("g"); | |
| var colorLegendG = g.append("g") | |
| .attr("class", "color-legend") | |
| .attr("transform", "translate(595, -36)"); | |
| var xScale = d3.scale.ordinal().rangePoints([0, innerWidth]); | |
| var radiusScale = d3.scale.sqrt().range([0, radiusMax]); | |
| var colorScale = d3.scale.category10(); | |
| var xAxis = d3.svg.axis().scale(xScale).orient("bottom") | |
| .outerTickSize(0); | |
| var pie = d3.layout.pie(); | |
| var arc = d3.svg.arc(); | |
| var colorLegend = d3.legend.color() | |
| .scale(colorScale) | |
| .shapePadding(3) | |
| .shapeWidth(40) | |
| .shapeHeight(40) | |
| .labelOffset(4); | |
| function render(data){ | |
| xScale.domain(data.map( function (d){ return d[xColumn]; })); | |
| radiusScale.domain([0, d3.max(data, function (d){ return d[radiusColumn]; })]); | |
| colorScale.domain(data.map(function (d){ return d[colorColumn]; })); | |
| pie.value(function (){ return 1; }); | |
| arc.outerRadius(function(d) { | |
| return radiusScale(d.data[radiusColumn]); | |
| }); | |
| var pieData = pie(data); | |
| pieG.attr("transform", "translate(" + innerWidth / 2 + "," + innerHeight / 2 + ")"); | |
| var slices = pieG.selectAll("path").data(pieData); | |
| slices.enter().append("path"); | |
| slices | |
| .attr("d", arc) | |
| .attr("fill", function (d){ return colorScale(d.data[colorColumn]); }); | |
| slices.exit().remove(); | |
| xAxisG.call(xAxis); | |
| colorLegendG.call(colorLegend); | |
| } | |
| function type(d){ | |
| d.name = "World"; | |
| d.population = +d.population; | |
| return d; | |
| } | |
| d3.csv("religionWorldTotals.csv", type, render); | |
| </script> | |
| </body> | |
| </html> |
| religion | population | |
|---|---|---|
| Christian | 2173100000 | |
| Muslim | 1598360000 | |
| Unaffiliated | 1126280000 | |
| Hindu | 1032860000 | |
| Buddhist | 487320000 | |
| Folk Religions | 404890000 | |
| Other Religions | 57770000 | |
| Jewish | 13640000 |
