Combination of mbostock's Pie Chart Example Gist and ZJONSSON's d3.legend Gist. Useful to me when data labels are too big to write over the pie chart itself. Probably obvious to veterans, but here it is anyway.
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Pie Chart with Legend
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| // d3.legend.js | |
| // (C) 2012 [email protected] | |
| // MIT licence | |
| (function() { | |
| d3.legend = function(g) { | |
| g.each(function() { | |
| var g= d3.select(this), | |
| items = {}, | |
| svg = d3.select(g.property("nearestViewportElement")), | |
| legendPadding = g.attr("data-style-padding") || 5, | |
| lb = g.selectAll(".legend-box").data([true]), | |
| li = g.selectAll(".legend-items").data([true]) | |
| lb.enter().append("rect").classed("legend-box",true) | |
| li.enter().append("g").classed("legend-items",true) | |
| svg.selectAll("[data-legend]").each(function() { | |
| var self = d3.select(this) | |
| items[self.attr("data-legend")] = { | |
| pos : self.attr("data-legend-pos") || this.getBBox().y, | |
| color : self.attr("data-legend-color") != undefined ? self.attr("data-legend-color") : self.style("fill") != 'none' ? self.style("fill") : self.style("stroke") | |
| } | |
| }) | |
| items = d3.entries(items).sort(function(a,b) { return a.value.pos-b.value.pos}) | |
| li.selectAll("text") | |
| .data(items,function(d) { return d.key}) | |
| .call(function(d) { d.enter().append("text")}) | |
| .call(function(d) { d.exit().remove()}) | |
| .attr("y",function(d,i) { return i+"em"}) | |
| .attr("x","1em") | |
| .text(function(d) { ;return d.key}) | |
| li.selectAll("circle") | |
| .data(items,function(d) { return d.key}) | |
| .call(function(d) { d.enter().append("circle")}) | |
| .call(function(d) { d.exit().remove()}) | |
| .attr("cy",function(d,i) { return i-0.25+"em"}) | |
| .attr("cx",0) | |
| .attr("r","0.4em") | |
| .style("fill",function(d) { console.log(d.value.color);return d.value.color}) | |
| // Reposition and resize the box | |
| var lbbox = li[0][0].getBBox() | |
| lb.attr("x",(lbbox.x-legendPadding)) | |
| .attr("y",(lbbox.y-legendPadding)) | |
| .attr("height",(lbbox.height+2*legendPadding)) | |
| .attr("width",(lbbox.width+2*legendPadding)) | |
| }) | |
| return g | |
| } | |
| })() |
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| age | population | |
|---|---|---|
| <5 | 2704659 | |
| 5-13 | 4499890 | |
| 14-17 | 2159981 | |
| 18-24 | 3853788 | |
| 25-44 | 14106543 | |
| 45-64 | 8819342 | |
| ≥65 | 612463 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 10px sans-serif; | |
| } | |
| .arc path { | |
| stroke: #fff; | |
| } | |
| .legend rect { | |
| fill:white; | |
| stroke:black;} | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="d3.legend.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500, | |
| radius = Math.min(width, height) / 2; | |
| var color = d3.scale.ordinal() | |
| .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]); | |
| var arc = d3.svg.arc() | |
| .outerRadius(radius - 10) | |
| .innerRadius(0); | |
| var pie = d3.layout.pie() | |
| .sort(null) | |
| .value(function(d) { return d.population; }); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"); | |
| d3.csv("data.csv", function(error, data) { | |
| data.forEach(function(d) { | |
| d.population = +d.population; | |
| }); | |
| var g = svg.selectAll(".arc") | |
| .data(pie(data)) | |
| .enter().append("g") | |
| .attr("class", "arc"); | |
| g.append("path") | |
| .attr("d", arc) | |
| .attr("data-legend", function(d) { return d.data.age; }) | |
| .attr("data-legend-pos", function(d, i) { return i; }) | |
| .style("fill", function(d) { return color(d.data.age); }); | |
| g.append("text") | |
| .attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; }) | |
| .attr("dy", ".35em") | |
| .style("text-anchor", "middle"); | |
| var padding = 20, | |
| legx = radius + padding, | |
| legend = svg.append("g") | |
| .attr("class", "legend") | |
| .attr("transform", "translate(" + legx + ", 0)") | |
| .style("font-size", "12px") | |
| .call(d3.legend); | |
| }); | |
| </script> |
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