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  code and to distribute it in your own products in source and binary forms
  is hereby granted, so long as this copyright notice and this copyright 
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package animTutorial;

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

/**
 * Using Surface and AnimCanvas.  Demonstrates usage of Surface class.  Displays a blank
 * surface and changes the surface color based on button presses. 
 */

public class UsingSurface extends Applet 
{

//	surface size
	static final int SURFACE_WIDTH = 300;
	static final int SURFACE_HEIGHT = 300;

// 	animcanvas
	AnimCanvas canvas;

 
/**
 * Perform necessary initialization.
 */

   	public void init()
   	{
      	System.out.println(getAppletInfo());
      	System.out.println("Initializing applet");   
      
//		setup gui components
//		set borderlayout manager
		setLayout(new BorderLayout());

// 		add the AnimCanvas to the applet
 		canvas = new AnimCanvas(SURFACE_WIDTH, SURFACE_HEIGHT);	
		add("Center", canvas);

//		set up container for buttons
		Panel ButtonPanel = new Panel();
		ButtonPanel.setLayout(new FlowLayout());
				
// 		add buttons
		ButtonPanel.add(new Button("Black"));
		ButtonPanel.add(new Button("Red"));
		ButtonPanel.add(new Button("Green"));
		ButtonPanel.add(new Button("Blue"));
		
		add("South", ButtonPanel);
		
      	System.out.println("Initializing applet: DONE");
   	}


/**
 * Applet start method.
 */

   	public void start() 
   	{
      	System.out.println("Starting the applet");
   	}
   

/**
 * Applet stop method.
 */ 

   	public void stop() 
   	{
      	System.out.println("Stopping the applet");   
   	} 
   
                 
/**
 * Applet destroy method.
 */

   	public void destroy() 
   	{
      	System.out.println("Destroying the applet!");         
   	} 
      
         
/**
 * Return applet info.
 * @return Applet info
 */
      
   	public String getAppletInfo()
   	{
      	return "UsingSurface v.1.0";
   	}     

/**
 * Event Handler for button clicks.  Change surface color.
 * @param evt Event description
 * @param arg String on the face of the button
 */

   	public boolean action(Event evt, Object arg)
   	{
//		change surface color depending on button click
//		use AnimCanvas.getSurface to get access to the surface
//		and then call Surface.setColor to change the color
 		if (arg.equals("Black"))
		{
			canvas.getSurface().setColor(Color.black);
		}
		else if (arg.equals("Red"))
		{
			canvas.getSurface().setColor(Color.red);
		}
		else if (arg.equals("Green"))
		{
			canvas.getSurface().setColor(Color.green);
		}
		else if (arg.equals("Blue"))
		{
			canvas.getSurface().setColor(Color.blue);
		}
		else
//			action not handled so return false
			return false;

//		repaint AnimCanvas to show color change
		canvas.repaint();

//		return true to show that action was handled
		return true;
   	}
   
}  	// applet UsingSurface