// Fig. 22.2: OvalPanel.java
// A customized JPanel class.
import java.awt.Graphics;
import java.awt.Dimension;
import javax.swing.JPanel;

public class OvalPanel extends JPanel 
{
   private int diameter = 10; // default diameter of 10

   // draw an oval of the specified diameter
   public void paintComponent( Graphics g )
   {
      super.paintComponent( g );

      g.fillOval( 10, 10, diameter, diameter ); // draw circle
   } // end method paintComponent

   // validate and set diameter, then repaint 
   public void setDiameter( int newDiameter )
   {
      // if diameter invalid, default to 10
      diameter = ( newDiameter >= 0 ? newDiameter : 10 );
      repaint(); // repaint panel
   } // end method setDiameter

   // used by layout manager to determine preferred size
   public Dimension getPreferredSize()
   {
      return new Dimension( 200, 200 );
   } // end method getPreferredSize

   // used by layout manager to determine minimum size
   public Dimension getMinimumSize()
   {
      return getPreferredSize();
   } // end method getMinimumSize
} // end class OvalPanel

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