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

public class MyApplet extends JApplet implements MouseMotionListener 
{ 
  Graphics2D MyGraphics2D; 

  public void init() 
  { 
    MyGraphics2D = (Graphics2D)getGraphics(); 
    addMouseMotionListener(this); 
  } 

  public void mouseDragged(MouseEvent ev) 
  { 
    MyGraphics2D.draw(new Line2D.Double(ev.getX(), ev.getY(), ev.getX() + 1, ev.getY())); 
  } 

  public void mouseMoved(MouseEvent ev) { } 
}