// Fig. 11.4: MyCanvas.java
// Using a customized Canvas object.
import java.applet.Applet;
import java.awt.*;

public class MyCanvas extends Applet {
   private Panel p;
   private CustomCanvas c;
   private Button circle, square;

   public void init()
   {
      c = new CustomCanvas();   // instantiate canvas
      c.setBackground( Color.green );

      square = new Button( "Square" );
      square.addActionListener(
         new ButtonHandler( c, CustomCanvas.SQUARE ) );
      circle = new Button( "Circle" );
      circle.addActionListener(
         new ButtonHandler( c, CustomCanvas.CIRCLE ) );

      p = new Panel();
      p.setLayout( new GridLayout( 2, 1 ) );
      p.add( circle );
      p.add( square );

      setLayout( new BorderLayout() );
      add( p, BorderLayout.WEST );  
      add( c, BorderLayout.CENTER );    // add canvas
   }
}