// Fig. 11.4: CustomCanvas.java
// A customized Canvas class.
import java.awt.*;

public class CustomCanvas extends Canvas {
   public final static int CIRCLE = 1, SQUARE = 2;
   private int shape;

   public void paint( Graphics g )
   {
      if ( shape == CIRCLE )
         g.fillOval( 50, 10, 60, 60 );
      else if ( shape == SQUARE )
         g.fillRect( 50, 10, 60, 60 );
   }

   public void draw( int s )
   {
      shape = s;
      repaint();
   }
}