code: @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;
  	}
docs: Replies if the given region contains the given point.
  
  @param region is the index of the region.
  @param cutX is the cut line of the region parent.
  @param cutY is the cut line of the region parent.
  @param pointX is the coordinate of the point to classify.
  @param pointY is the coordinate of the point to classify.
  @return <code>true</code> if the point is inside the given region,
  otherwise <code>false</code>