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34 lines
883 B
34 lines
883 B
1 year ago
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import {linearish} from "./linear";
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export default function diverging(interpolator) {
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var x0 = 0,
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x1 = 0.5,
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x2 = 1,
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k10 = 1,
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k21 = 1,
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clamp = false;
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function scale(x) {
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var t = 0.5 + ((x = +x) - x1) * (x < x1 ? k10 : k21);
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return interpolator(clamp ? Math.max(0, Math.min(1, t)) : t);
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}
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scale.domain = function(_) {
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return arguments.length ? (x0 = +_[0], x1 = +_[1], x2 = +_[2], k10 = x0 === x1 ? 0 : 0.5 / (x1 - x0), k21 = x1 === x2 ? 0 : 0.5 / (x2 - x1), scale) : [x0, x1, x2];
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};
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scale.clamp = function(_) {
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return arguments.length ? (clamp = !!_, scale) : clamp;
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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.copy = function() {
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return diverging(interpolator).domain([x0, x1, x2]).clamp(clamp);
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};
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return linearish(scale);
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}
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