reusable legend
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March 10, 2017 01:12
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legend
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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="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.scaleOrdinal() | |
.domain( ["A", "B", "C", "D"] ) | |
.range(["#fe9929", "#ec7014", "#cc4c02", "#8c2d04"]); | |
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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