package edu.ucsb.cs56.S11.pconrad.lab03;
/**
 * Circle extends Ellipse2D to make it easier to draw circles
 * because the parameters to the constructor are more convenient
 * 
 * @author P. Conrad  
 * @version for UCSB CS56, S11, 04/11/2011
 */
public class Circle extends java.awt.geom.Ellipse2D.Double
{ 
    /**
     * Constructor for objects of class Circle
     * @param x    x coordinate of center of circle
     * @param y    y coordinate of center of circle
     * @param r    radius of circle
     */
    public Circle(double x, double y, double r)
    {
        // invoke the super class constructor,
        // i.e. the one for Ellipse2D.Double, which takes
        // upper-left-x, upper-left-y (of the bounding box)
        // width, and height
        
        super( x - r, y - r,   /* upper left corner of bounding box */
               r * 2,  r * 2); /* width and height are double the radius */
    }
    
}