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

public class Example02 extends Applet
   implements MouseListener, MouseMotionListener {

   Vector< Point > listOfPositions = new Vector< Point >();

   public void init() {
      setBackground( Color.black );

      addMouseListener( this );
      addMouseMotionListener( this );
   }

   public void mouseEntered( MouseEvent e ) { }
   public void mouseExited( MouseEvent e ) { }
   public void mouseClicked( MouseEvent e ) { }
   public void mousePressed( MouseEvent e ) { }
   public void mouseReleased( MouseEvent e ) { }
   public void mouseMoved( MouseEvent e ) {

      if ( listOfPositions.size() >= 50 ) {
         listOfPositions.removeElementAt( 0 );
      }

      listOfPositions.addElement( new Point( e.getX(), e.getY() ) );

      repaint();
      e.consume();
   }
   public void mouseDragged( MouseEvent e ) { }

   public void paint( Graphics g ) {
      g.setColor( Color.white );
      for ( int j = 1; j < listOfPositions.size(); ++j ) {
         Point A = listOfPositions.elementAt( j-1 );
         Point B = listOfPositions.elementAt( j );
         g.drawLine( A.x, A.y, B.x, B.y );
      }
   }
}