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

public class Canvas extends JPanel {
    /**
     * Our basic shape, in canonical orientation, centered at 0, 0
     */
    private Rectangle2D rect = new Rectangle2D.Double (-25, -25, 50, 50); 

    private Main parent;

    public Canvas (Main parent) {
	this.parent = parent;
    }

    public void paintComponent (Graphics g) { 
	super.paintComponent(g);
	Graphics2D g2 = (Graphics2D) g;

	int nboxes = parent.getFrameNumber(); 

	for (int ibox=0; ibox<nboxes; ibox++) { 
	    g2.setTransform (new AffineTransform()); 
	    g2.translate (100+2*ibox, 100+2*ibox); 
	    g2.rotate (ibox/10.); 
	    g2.draw (rect); 
	}

	g2.setTransform (new AffineTransform()); 
    }
}