reusable legend
Created
April 26, 2018 17:20
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legend
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| license: mit |
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| d3.legend = function() { | |
| // Defaults | |
| var t = [0, 0], | |
| cb = null, | |
| colors = d3.scaleOrdinal() | |
| .domain(["A", "B", "C", "D"]) | |
| .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b"]); | |
| var box = 38, | |
| padding = 2, | |
| dx = box + padding; | |
| function legend(selection) { | |
| selection.each(function() { | |
| var legend = d3.select(this).selectAll(".legend") | |
| .data( colors.domain().slice().reverse() ) | |
| .enter().append("g") | |
| .attr("class", "legend") | |
| .attr("transform", function(d, i) { return "translate(" + t[0] + "," + (t[1] + i * dx) + ")"; }); | |
| legend.append("rect") | |
| .attr("x", 0 ) | |
| .attr("width", box) | |
| .attr("height", box) | |
| .style("fill", colors); | |
| legend.append("text") | |
| .attr("x", - 2 * padding ) | |
| .attr("y", box / 2) | |
| .attr("dy", ".35em") | |
| .style("text-anchor", "end") | |
| .style("font-size", "0.8em") | |
| .text(function(d) { return d; }); | |
| if (typeof cb == "function") cb(); | |
| }) | |
| } | |
| legend.translate = function(_) { | |
| if (!arguments.length) return t; | |
| t = _; | |
| return legend; | |
| }; | |
| legend.colors = function(_) { | |
| if (!arguments.length) return colors; | |
| colors = _; | |
| return legend; | |
| }; | |
| legend.cb = function(_) { | |
| if (!arguments.length) return cb; | |
| cb = _; | |
| return legend; | |
| }; | |
| return legend; | |
| } |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>legend</title> | |
| <style> | |
| body { | |
| font-family:'Helvetica Neue', Helvetica, Arial, sans-serif; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script> | |
| <script src="d3.legend.js"></script> | |
| <script> | |
| var margin = {top: 50, right: 50, bottom: 50, left: 50}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.bottom - margin.top; | |
| var colors = d3.scaleThreshold() | |
| .domain([.3, .4, .6, .8, 1, 2, 3, 4, 5]) | |
| .range(d3.schemeYlOrBr[9]) | |
| var legend = d3.legend() | |
| .translate([ width / 4 , height / 4 ]) | |
| .colors(colors) | |
| .cb(function() { console.log("Done!"); }); | |
| d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")") | |
| .call(legend); | |
| </script> |
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