package visual.statik.described;

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;

/**
 * A JPanel that performs constructive area geometryt operations
 * on an Ellipse2D and a Rectangle2D
 *
 * @author  Prof. David Bernstein, James Madison University
 * @version 1.0
 */
public class   ConstructiveAreaGeometryCanvas 
       extends JComponent
{
    private Ellipse2D        ellipse;
    private Rectangle2D      rectangle;
    private String           op;


    private static final Color GOLD  =new Color(194,161, 77);
    private static final Color PURPLE=new Color( 69,  0,132);

    
    /**
     * Default Constructor
     */
    public ConstructiveAreaGeometryCanvas()
    {
	ellipse   = new Ellipse2D.Double(20, 20, 100, 100);
	rectangle = new Rectangle2D.Double(60, 40, 200, 200); 


	op = "Outline";
    }



    /**
     * Paint this Component
     *
     * @param g   The rendering engine to use
     */
    public void paint(Graphics g)
    {
	Area               e, r;
	Graphics2D         g2;


	g2 = (Graphics2D)g;

	if (op.equalsIgnoreCase("Outline"))
        {
	    g2.setPaint(Color.BLACK);
	    g2.draw(ellipse);
	    g2.draw(rectangle);

	}
        else
        {
//[1.
	    e = new Area(ellipse);
	    r = new Area(rectangle);
	    
	    if      (op.equalsIgnoreCase("Union"))        
		           e.add(r);
	    else if (op.equalsIgnoreCase("Intersection")) 
		           e.intersect(r);
	    else if (op.equalsIgnoreCase("Difference"))   
		           e.subtract(r);
	    else                                          
		           e.exclusiveOr(r);
	    
	    g2.setPaint(GOLD);
	    g2.fill(e);
	    g2.setPaint(PURPLE);
	    g2.draw(e);
//]1.
	}
    }


    /**
     * Set the CAG operation (Outline, Union, Intersection,
     * Difference, or Symmetric_Difference)
     *
     * @op  The operation
     */
    public void setOperation(String op)
    {
	this.op = op;
    }
}