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    <p>The source code is on lines 2997- on <a href="http://%20https://github.com/mbostock/d3/blob/master/d3.v2.js" rel="nofollow">d3.v2.js</a>:</p> <pre><code>d3.scale.category20c = function() { return d3.scale.ordinal().range(d3_category20c); }; </code></pre> <p>Which is calling:</p> <pre><code>// lines 2894-2896 d3.scale.ordinal = function() { return d3_scale_ordinal([], {t: "range", x: []}); }; </code></pre> <p>Which then calls </p> <pre><code>// lines 2903-2905 function scale(x) { return range[((index.get(x) || index.set(x, domain.push(x))) - 1) % range.length]; } </code></pre> <p>The parameter passed in, <code>x</code> is set to <code>d3_category20c</code> which assigns colors from the list of 20 available colors seen below:</p> <pre><code>["#3182bd", "#6baed6", "#9ecae1", "#c6dbef", "#e6550d", "#fd8d3c", "#fdae6b", "#fdd0a2", "#31a354", "#74c476", "#a1d99b", "#c7e9c0", "#756bb1", "#9e9ac8", "#bcbddc", "#dadaeb", "#636363", "#969696", "#bdbdbd", "#d9d9d9"] </code></pre> <p>Stepping through the code I see the colors assigned like this (based on the category passed in):</p> <pre><code>cluster = 0 #3182bd graph = 1 #6baed6 optimization = 2 #9ecae1 animate = 3 #c6dbef interpolate = 4 #e6550d converters = 5 #fd8d3c data = 6 #fdae6b display = 7 #fdd0a2 flex = 8 #31a354 physics = 9 #74c476 query = 10 #a1d99b methods = 11 #c7e9c0 scale = 12 #756bb1 util = 13 #9e9ac8 heap = 14 #bcbddc math = 15 #dadaeb palette = 16 #636363 axis = 17 #969696 controls = 18 #bdbdbd render = 19 #d9d9d9 events = 0 #3182bd legend = 1 #6baed6 etc... </code></pre> <p>Note, it's using the mod operator so it can keep assigning colors if the number of passed in categories exceeds the range of 20 colors.</p> <p>Note, the colors for <code>d3_category20c</code> are defined in <a href="https://github.com/mbostock/d3/blob/master/src/scale/category.js" rel="nofollow">category.js</a>, lines 48-54.</p>
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