docs: @Pure
  	static boolean contains(int region, double cutX, double cutY, double pointX, double pointY) {
  		switch (IcosepQuadTreeZone.values()[region]) {
  		case SOUTH_WEST:
  			return pointX <= cutX && pointY <= cutY;
  		case SOUTH_EAST:
  			return pointX >= cutX && pointY <= cutY;
  		case NORTH_WEST:
  			return pointX <= cutX && pointY >= cutY;
  		case NORTH_EAST:
  			return pointX >= cutX && pointY >= cutY;
  		case ICOSEP:
  			return true;
  		default:
  		}
  		return false;
  	}