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import {ascending, bisect, quantile} from "d3-array"; |
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import {identity} from "./continuous.js"; |
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import {initInterpolator} from "./init.js"; |
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export default function sequentialQuantile() { |
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var domain = [], |
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interpolator = identity; |
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function scale(x) { |
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if (x != null && !isNaN(x = +x)) return interpolator((bisect(domain, x, 1) - 1) / (domain.length - 1)); |
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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 (let d of _) if (d != null && !isNaN(d = +d)) domain.push(d); |
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domain.sort(ascending); |
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return scale; |
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}; |
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scale.interpolator = function(_) { |
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return arguments.length ? (interpolator = _, scale) : interpolator; |
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}; |
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scale.range = function() { |
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return domain.map((d, i) => interpolator(i / (domain.length - 1))); |
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}; |
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scale.quantiles = function(n) { |
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return Array.from({length: n + 1}, (_, i) => quantile(domain, i / n)); |
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}; |
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scale.copy = function() { |
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return sequentialQuantile(interpolator).domain(domain); |
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}; |
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return initInterpolator.apply(scale, arguments); |
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} |
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