public class Rhombus extends Quadrilateral {
    private double sideLength;
    public Rhombus (Point p1, Point p2, Point p3, Point p4) throws Exception {
        super(p1, p2, p3, p4);
        double s12 = p1.distTo(p2);
        if (s12!=p2.distTo(p3) || s12!=p3.distTo(p4) || s12!=p4.distTo(p1))
            throw new Exception ("Rhombus with unequal sides.");
        sideLength = s12;
    }
    public Rhombus (Point p, double sideLength, double theta) {
        super (p,
               new Point(p.x+sideLength*Math.cos(theta), p.y+sideLength*Math.sin(theta)),
               new Point(p.x+sideLength*(Math.cos(theta)+1.), p.y+sideLength*Math.sin(theta)),
               new Point(p.x+sideLength, p.y));
        this.sideLength = sideLength;
    }
    public double getSideLength() {
        return sideLength;
    }
}
// Local Variables:
// c-basic-offset:  4
// indent-tabs-mode: nil
// compile-command: "javac *.java; java TestQuad"
// End: