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52 lines
1.3 KiB
52 lines
1.3 KiB
import {ascending, bisect, quantile as threshold} from "d3-array";
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import {slice} from "./array";
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export default function quantile() {
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var domain = [],
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range = [],
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thresholds = [];
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function rescale() {
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var i = 0, n = Math.max(1, range.length);
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thresholds = new Array(n - 1);
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while (++i < n) thresholds[i - 1] = threshold(domain, i / n);
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return scale;
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}
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function scale(x) {
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if (!isNaN(x = +x)) return range[bisect(thresholds, x)];
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}
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scale.invertExtent = function(y) {
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var i = range.indexOf(y);
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return i < 0 ? [NaN, NaN] : [
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i > 0 ? thresholds[i - 1] : domain[0],
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i < thresholds.length ? thresholds[i] : domain[domain.length - 1]
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];
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};
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scale.domain = function(_) {
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if (!arguments.length) return domain.slice();
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domain = [];
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for (var i = 0, n = _.length, d; i < n; ++i) if (d = _[i], d != null && !isNaN(d = +d)) domain.push(d);
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domain.sort(ascending);
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return rescale();
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};
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scale.range = function(_) {
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return arguments.length ? (range = slice.call(_), rescale()) : range.slice();
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};
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scale.quantiles = function() {
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return thresholds.slice();
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};
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scale.copy = function() {
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return quantile()
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.domain(domain)
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.range(range);
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};
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return scale;
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}
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