/* MouseDown3 draws a circle where the mouse
          is clicked. Notice that this example overrides
          the update() method to prevent the automatic
          erasing of the background. */




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



       public class MouseDown3 extends Applet {

         int x;
         int y;


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


         public boolean mouseDown(Event evt, int x, int y) {
           this.x = x;
           this.y = y;
           repaint();           // request to be repainted
           return true;
        }



         public void update(Graphics g) {  // override to avoid
           paint(g);                       // erasing background
         }


         public void paint(Graphics g) {
           g.setColor(Color.red);
           g.fillOval( x, y, 25, 25);
         }

       }