These donut charts are constructed from a CSV file storing the populations of various age groups in different states. (As a practical note, a normalized stacked area chart facilitates easier comparison of values.) The chart employs a number of D3 features:
xxxxxxxxxx<meta charset="utf-8"><style>body { font: 10px sans-serif;}svg { padding: 10px 0 0 10px;}.arc { stroke: #fff;}</style><body><script src="//d3js.org/d3.v3.min.js"></script><script>var radius = 74, padding = 10;var color = d3.scale.ordinal() .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);var arc = d3.svg.arc() .outerRadius(radius) .innerRadius(radius - 30);var pie = d3.layout.pie() .sort(null) .value(function(d) { return d.population; });d3.csv("data.csv", function(error, data) { if (error) throw error; color.domain(d3.keys(data[0]).filter(function(key) { return key !== "State"; })); data.forEach(function(d) { d.ages = color.domain().map(function(name) { return {name: name, population: +d[name]}; }); }); var legend = d3.select("body").append("svg") .attr("class", "legend") .attr("width", radius * 2) .attr("height", radius * 2) .selectAll("g") .data(color.domain().slice().reverse()) .enter().append("g") .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; }); legend.append("rect") .attr("width", 18) .attr("height", 18) .style("fill", color); legend.append("text") .attr("x", 24) .attr("y", 9) .attr("dy", ".35em") .text(function(d) { return d; }); var svg = d3.select("body").selectAll(".pie") .data(data) .enter().append("svg") .attr("class", "pie") .attr("width", radius * 2) .attr("height", radius * 2) .append("g") .attr("transform", "translate(" + radius + "," + radius + ")"); svg.selectAll(".arc") .data(function(d) { return pie(d.ages); }) .enter().append("path") .attr("class", "arc") .attr("d", arc) .style("fill", function(d) { return color(d.data.name); }); svg.append("text") .attr("dy", ".35em") .style("text-anchor", "middle") .text(function(d) { return d.State; });});</script> https://d3js.org/d3.v3.min.js