proton-engine/src/math/MathUtil.js

Proton is a simple and powerful javascript particle animation engine.

const PI = 3.1415926;
const INFINITY = Infinity;

const MathUtil = {
  PI: PI,
  PIx2: PI * 2,
  PI_2: PI / 2,
  PI_180: PI / 180,
  N180_PI: 180 / PI,
  Infinity: -999,

  isInfinity(num) {
    return num === this.Infinity || num === INFINITY;
  },

  randomAToB(a, b, isInt = false) {
    if (!isInt) return a + Math.random() * (b - a);
    else return ((Math.random() * (b - a)) >> 0) + a;
  },

  randomFloating(center, f, isInt) {
    return this.randomAToB(center - f, center + f, isInt);
  },

  randomColor() {
    return "#" + ("00000" + ((Math.random() * 0x1000000) << 0).toString(16)).slice(-6);
  },

  randomZone(display) {},

  floor(num, k = 4) {
    const digits = Math.pow(10, k);
    return Math.floor(num * digits) / digits;
  },

  degreeTransform(a) {
    return (a * PI) / 180;
  },

  toColor16(num) {
    return `#${num.toString(16)}`;
  }
};

export default MathUtil;