/**
 * @(#)Circle.java
 *
 *
 * @author 
 * @version 1.00 2011/3/7
 */

package net.davidwills.cmis345.shapes;

public class Circle {

    public static final double PI = 3.141592;
    
    protected double r;
    
    //no-arg ctor.  unit circle
    public Circle() {
        r = 1.0;	
    }
    
    public Circle(double r) {
    	checkRadius(r);
    	this.r = r;
    }
    
    //copy ctor
    public Circle(Circle that) {
        this.r = that.r;
    }
    
    public double getRadius() {
    	return r;
    }
    
    public void setRadius(double r) {
    	checkRadius(r);
	this.r = r;
    }
    
    protected void checkRadius(double r) {
    	if (r < 0)
    	    throw new IllegalArgumentException("radius cannot be negative");
    }
    
    public Circle bigger(Circle that) {
    	if (this.r > that.r)
    	    return this;
    	else
    	    return that;
    }
    
    public static Circle bigger(Circle a, Circle b) {
    	if (a.r < b.r)
    	    return a;
    	else
    	    return b;
    }
}