public class Rectangle extends Quadrilateral {
    private double width, height;
    public Rectangle(Point p1, Point p2, Point p3, Point p4) {
	super(p1, p2, p3, p4);
	width = p1.distTo(p2);
	height = p2.distTo(p3);
	// should check that all angles are right angles via slopes neg recip
	// or check both widths equal, both heights equal, both diags equal
    }
    public Rectangle(Point p1, Point p3) { // Sides parallel to the axes
	super(p1, new Point(p3.x,p1.y), p3, new Point(p1.x,p3.y));
	width = Math.abs(p1.x-p3.x);
	height = Math.abs(p1.y-p3.y);
	// Nothing to check
    }
    public double getWidth() {
	return width;
    }
    public double getHeight() {
	return height;
    }
    public double area() {
	return width * height;
    }
}
// Local Variables:
// c-basic-offset:  4
// compile-command: "javac Rectangle.java"
// End: