import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class Prog39 
       extends Applet
       implements MouseListener, 
                  MouseMotionListener {
  int x0, y0;
  Graphics g;
  public void init() {
    x0=0; y0=0;
    g = getGraphics();
    addMouseListener(this);
    addMouseMotionListener(this);
  }
  public void mousePressed(MouseEvent e){
    int x,y;
    x = e.getX();
    y = e.getY();
    x0=x; y0=y;
  }
  public void mouseDragged(MouseEvent e){
    int x,y;
    x = e.getX();
    y = e.getY();
    g.drawLine(x0, y0, x, y);
    x0=x; y0=y;
  }
  public void mouseEntered(MouseEvent e) {}
  public void mouseExited(MouseEvent e) {}
  public void mouseClicked(MouseEvent e) {}
  public void mouseReleased(MouseEvent e) {}
  public void mouseMoved(MouseEvent e) {}
}