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| <!DOCTYPE html> | |
| <svg width="960" height="500"><g transform="translate(360,250)"></g></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var formatPercent = d3.format(".0%"), | |
| formatNumber = d3.format(".0f"); | |
| var threshold = d3.scaleThreshold() | |
| .domain([0.11, 0.22, 0.33, 0.50]) | |
| .range(["#fee5d9", "#fcae91", "#fb6a4a", "#de2d26", "#a50f15"]); | |
| var x = d3.scaleLinear() | |
| .domain([0, 1]) | |
| .range([0, 240]); | |
| var xAxis = d3.axisBottom(x) | |
| .tickSize(13) | |
| .tickValues(threshold.domain()) | |
| .tickFormat(function(d) { return d === 0.5 ? formatPercent(d) : formatNumber(100 * d); }); | |
| var g = d3.select("g").call(xAxis); | |
| g.select(".domain") | |
| .remove(); | |
| g.selectAll("rect") | |
| .data(threshold.range().map(function(color) { | |
| var d = threshold.invertExtent(color); | |
| if (d[0] == null) d[0] = x.domain()[0]; | |
| if (d[1] == null) d[1] = x.domain()[1]; | |
| return d; | |
| })) | |
| .enter().insert("rect", ".tick") | |
| .attr("height", 8) | |
| .attr("x", function(d) { return x(d[0]); }) | |
| .attr("width", function(d) { return x(d[1]) - x(d[0]); }) | |
| .attr("fill", function(d) { return threshold(d[0]); }); | |
| g.append("text") | |
| .attr("fill", "#000") | |
| .attr("font-weight", "bold") | |
| .attr("text-anchor", "start") | |
| .attr("y", -6) | |
| .text("Population density"); | |
| </script> |
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