private Point[] genSelection(Point base, Point[] rel) {
		Point[] selection = new Point[4];
		selection[0] = base;
		int x = base.getX();
		int y = base.getY();
		for (int i = 0; i < rel.length; i++) {
			selection[i+1] = new Point(x+rel[i].getX(), y+rel[i].getY());
		}
		return selection;
	}