import java.applet.*;
import java.awt.event.*;
import java.awt.*;

public class Main extends Applet implements KeyListener
{
     Graphics bufferGraphics;
     Image offscreen;
     Dimension dim;
     int squareX;
     int squareY;
     Image back;
     

     public void init() 
     {
          dim = getSize();
          requestFocus();
          back = getImage(getDocumentBase(),"bg.jpg");
          
          offscreen = createImage(dim.width,dim.height);
          bufferGraphics = offscreen.getGraphics();
     }

      public void paint(Graphics g) 
     {
    	  
          bufferGraphics.clearRect(0,0,dim.width,dim.width);
          bufferGraphics.drawImage(back,0,0,this); 
          
          bufferGraphics.setColor(Color.red);
          bufferGraphics.drawString("Double-buffered",10,10);

          bufferGraphics.fillRect(squareX,squareY,20,20);
          g.drawImage(offscreen,0,0,this);
     }


     public void update(Graphics g)
     {
          paint(g);
     }
 
     public void keyPressed(KeyEvent e) {
    	 if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
    		 squareX++;
    		 repaint();
    	 }
 
     }
     
     public void keyReleased(KeyEvent e) {

    	 
     }
     
     public void keyTyped(KeyEvent e) {
    	 
    	 
     }

 }