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

public class Canvas extends JPanel {
    // Remember in ivar so can redraw
    ImageIcon icon1, icon2; 

    Canvas () {
	icon1 = new ImageIcon ("redBall.gif"); 
	icon2 = new ImageIcon ("blueBall.gif"); 
    }

    // This is our draw callback
    public void paintComponent (Graphics g) { 
	super.paintComponent(g);
	
	icon1.paintIcon (this, g, 100, 100); 
	icon2.paintIcon (this, g, 200, 200); 

	g.drawLine (50, 50, 100, 50); 
    }
}