Function getMappedPositionPart

source/part.js:34–66

(position, pity = [0, 0])

export const PART_OUTSIDE_PITY_SCALE = 1.0;
export const getMappedPositionPart = (position, pity = [0, 0]) => {
  const [x, y] = position;
  const [px, py] = pity.map((axis) => Math.min(0.25, axis));

  if (x <= 0.0 - px * PART_OUTSIDE_PITY_SCALE)
    return makePart(PART_TYPE.OUTSIDE);
  if (x >= 1.0 + px * PART_OUTSIDE_PITY_SCALE)
    return makePart(PART_TYPE.OUTSIDE);
  if (y <= 0.0 - py * PART_OUTSIDE_PITY_SCALE)
    return makePart(PART_TYPE.OUTSIDE);
  if (y >= 1.0 + py * PART_OUTSIDE_PITY_SCALE)
    return makePart(PART_TYPE.OUTSIDE);

  // Left Edge
  if (x <= 0.0 + px) {
    if (y <= 0.0 + py) return makePart(PART_TYPE.CORNER, 0);
    if (y >= 1.0 - py) return makePart(PART_TYPE.CORNER, 2);
    return makePart(PART_TYPE.EDGE, 1);
  }

  // Right Edge
  if (x >= 1.0 - px) {
    if (y <= 0.0 + py) return makePart(PART_TYPE.CORNER, 1);
    if (y >= 1.0 - py) return makePart(PART_TYPE.CORNER, 3);
    return makePart(PART_TYPE.EDGE, 2);
  }

  // Top + Bottom Edges
  if (y <= 0.0 + py) return makePart(PART_TYPE.EDGE, 0);
  if (y >= 1.0 - py) return makePart(PART_TYPE.EDGE, 3);

  return makePart(PART_TYPE.INSIDE);
};