CircleDrawer example

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
/*
  <applet code="CircleDrawer1" width=300 height=300>
  </applet>
*/

public class CircleDrawer1 extends Applet
{
public void init()
{
    setForeground(Color.blue);
    addMouseMotionListener(new CircleListener());
}
}


 class CircleListener extends MouseMotionAdapter
{
    private int radius=10;
    public void mouseDragged(MouseEvent me)
    {
        Applet app=(Applet)me.getSource();
        Graphics g=app.getGraphics();
        g.fillOval(me.getX()-radius, me.getY()-radius,2*radius,2*radius);
    }
}