public void add(double x, double y) {
		if (isEmpty()) {
			setBounds(x, y, 0, 0);
			return;
		}
		double x2 = Math.max(x + myWidth, x);
		double y2 = Math.max(y + myHeight, y);
		xc = Math.min(x, xc);
		yc = Math.min(y, yc);
		myWidth = x2 - xc;
		myHeight = y2 - yc;
	}