// Triptych.java
//adapted from Deitel
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Triptych extends JApplet {

    private JPanel buttonPanel;
    private CustomPanel[] myPanels;
    private JButton circleButton, squareButton;
    private JLabel infoLabel;

   public void init()
   {
       infoLabel = new JLabel( "Triptych Randomis" );

       myPanels = new CustomPanel[3];
       JPanel myPanelsPanel = new JPanel();
       myPanelsPanel.setLayout( new GridLayout(1,3, 4,4) );
       for (int i=0; i<3; i++) {
	   myPanels[i] = new CustomPanel();   
	   myPanels[i].setBackground( new Color(
		  (int)(Math.random()*256),
		  (int)(Math.random()*256),
		  (int)(Math.random()*256) ));
	   myPanelsPanel.add( myPanels[i] );
       }
				      
      // set up squareButton
      squareButton = new JButton( "Square" );
      squareButton.addActionListener(
         new ActionListener() {  // anonymous inner class 
            // draw a square
            public void actionPerformed( ActionEvent event )
            {
               myPanels[(int)(Math.random()*3)].draw( CustomPanel.SQUARE );
            }
         } // end anonymous inner class
      ); // end call to addActionListener

      circleButton = new JButton( "Circle" );
      circleButton.addActionListener(
         new ActionListener() {  // anonymous inner class 
            // draw a circle
            public void actionPerformed( ActionEvent event )
            {
               myPanels[(int)(Math.random()*3)].draw( CustomPanel.CIRCLE );
            }
         } // end anonymous inner class
      ); // end call to addActionListener

      // set up panel containing buttons
      buttonPanel = new JPanel();
      buttonPanel.setLayout( new GridLayout( 1, 2 ) );
      buttonPanel.add( circleButton );
      buttonPanel.add( squareButton );

      // attach button panel & custom drawing area to content pane
      Container container = getContentPane();
      container.add( infoLabel, BorderLayout.NORTH );  
      container.add( myPanelsPanel, BorderLayout.CENTER );  
      container.add( buttonPanel, BorderLayout.SOUTH );
   } 

}


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

   // use shape to draw an oval or rectangle
   public void paintComponent( Graphics g )
   {
      super.paintComponent( g );
      int w=getWidth();
      int h=getHeight();
      for (int i=1; i<100; i++)
	  g.drawLine((int)(Math.random()*w-w/4),
		     (int)(Math.random()*h-h/4),
		     (int)(Math.random()*w+w/4),
		     (int)(Math.random()*h+h/4));

      if ( shape == CIRCLE )
         g.fillOval( 50, 10, 60, 60 );
      else if ( shape == SQUARE )
         g.fillRect( 50, 10, 60, 60 );
   }

   // set shape value and repaint CustomPanel
   public void draw( int shapeToDraw )
   {
      shape = shapeToDraw;
      repaint();
   }

} // end class CustomPanel