61 lines
1.5 KiB
JavaScript
61 lines
1.5 KiB
JavaScript
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"use strict";
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{
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const defineMath = (name, assignment) => {
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var configurable = typeof assignment === "function" ? true : false;
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var writable = typeof assignment === "function" ? true : false;
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var enumerable = typeof assignment === "function" ? true : false;
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Object.defineProperty(Math, name, {
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configurable: configurable,
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enumerable: enumerable,
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writable: writable,
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value: assignment
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});
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};
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defineMath("DEG_PER_RAD", Math.PI / 180);
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defineMath("RAD_PER_DEG", 180 / Math.PI);
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const f32A = new Float32Array(1);
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defineMath("scale", function scale(x, inLow, inHigh, outLow, outHigh) {
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if (arguments.length === 0) {
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return NaN;
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}
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if (Number.isNaN(x) ||
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Number.isNaN(inLow) ||
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Number.isNaN(inHigh) ||
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Number.isNaN(outLow) ||
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Number.isNaN(outHigh)) {
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return NaN;
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}
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if (x === Infinity ||
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x === -Infinity) {
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return x;
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}
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return (x - inLow) * (outHigh - outLow) /
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(inHigh - inLow) + outLow;
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});
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defineMath("fscale", function fscale(x, inLow, inHigh, outLow, outHigh) {
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f32A[0] = Math.scale(x, inLow, inHigh, outLow, outHigh);
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return f32A[0];
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});
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defineMath("clamp", function clamp(x, lower, upper) {
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return Math.min(upper, Math.max(lower, x));
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});
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defineMath("radians", function radians(degrees) {
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return degrees * Math.DEG_PER_RAD;
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});
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defineMath("degrees", function degrees(radians) {
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return radians * Math.RAD_PER_DEG;
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});
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}
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