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14 lines
602 B
14 lines
602 B
3 years ago
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// `Math.scale` method implementation
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// https://rwaldron.github.io/proposal-math-extensions/
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module.exports = Math.scale || function scale(x, inLow, inHigh, outLow, outHigh) {
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var nx = +x;
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var nInLow = +inLow;
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var nInHigh = +inHigh;
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var nOutLow = +outLow;
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var nOutHigh = +outHigh;
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// eslint-disable-next-line no-self-compare -- NaN check
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if (nx != nx || nInLow != nInLow || nInHigh != nInHigh || nOutLow != nOutLow || nOutHigh != nOutHigh) return NaN;
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if (nx === Infinity || nx === -Infinity) return nx;
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return (nx - nInLow) * (nOutHigh - nOutLow) / (nInHigh - nInLow) + nOutLow;
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};
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