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