silphius/app/util/math.js

export const {
  abs,
  acos,
  acosh,
  asin,
  asinh,
  atan,
  atanh,
  atan2,
  ceil,
  cbrt,
  expm1,
  clz32,
  cos,
  cosh,
  exp,
  floor,
  fround,
  hypot,
  imul,
  log,
  log1p,
  log2,
  log10,
  max,
  min,
  round,
  sign,
  sin,
  sinh,
  sqrt,
  tan,
  tanh,
  trunc,
  E,
  LN10,
  LN2,
  LOG10E,
  LOG2E,
  PI,
  SQRT1_2,
  SQRT2,
} = Math;

export function clamp(n, min, max) {
  return Math.max(min, Math.min(max, n));
}

export function distance({x: lx, y: ly}, {x: rx, y: ry}) {
  const xd = lx - rx;
  const yd = ly - ry;
  return Math.sqrt(xd * xd + yd * yd);
}

export function intersects(l, r) {
  if (l.x0 > r.x1) return false;
  if (l.y0 > r.y1) return false;
  if (l.x1 < r.x0) return false;
  if (l.y1 < r.y0) return false;
  return true;
}

export function normalizeVector({x, y}) {
  if (0 === y && 0 === x) {
    return {x: 0, y: 0};
  }
  const k = 1 / Math.sqrt(x * x + y * y);
  return {x: x * k, y: y * k};
}

export function random() {
  return Math.random();
}