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Filename : arithmetic.ts
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export function degrees2radians(n: number) {
  return n * (Math.PI / 180);
}

export function max3(a: number, b: number, c: number) {
  let m = a;
  if (m < b) m = b;
  if (m < c) m = c;
  return m;
}

export function min3(a: number, b: number, c: number) {
  let m = a;
  if (m > b) m = b;
  if (m > c) m = c;
  return m;
}

export function intInRange(value: number, low: number, high: number) {
  if (value > high) value = high;
  if (value < low) value = low;
  return value | 0;
}

export function inRange0to255Rounded(n: number) {
  n = Math.round(n);
  if (n > 255) n = 255;
  else if (n < 0) n = 0;
  return n;
}

export function inRange0to255(n: number) {
  if (n > 255) n = 255;
  else if (n < 0) n = 0;
  return n;
}

export function stableSort<T>(
  arrayToSort: T[],
  callback: (a: T, b: T) => number,
) {
  const type = typeof arrayToSort[0];
  let sorted: T[];

  if (type === 'number' || type === 'string') {
    const ord = Object.create(null);
    for (let i = 0, l = arrayToSort.length; i < l; i++) {
      const val = arrayToSort[i] as unknown as string;
      if (ord[val] || ord[val] === 0) continue;
      ord[val] = i;
    }

    sorted = arrayToSort.sort((a, b) => callback(a, b) || ord[a] - ord[b]);
  } else {
    const ord2 = arrayToSort.slice(0);
    sorted = arrayToSort.sort(
      (a, b) => callback(a, b) || ord2.indexOf(a) - ord2.indexOf(b),
    );
  }

  return sorted;
}