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package animTutorial;

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

/**
 * UsingStaticDataSprites.  Demonstrates usage of StaticDataSprite class.  
 * Displays a street scene composed of three sprites and an Elvis sprite.
 * Transparency color of Elvis Sprite's SingleImage changes with button clicks.
 */

public class UsingStaticDataSprites extends Applet 
{

//	surface size
	static final int SURFACE_WIDTH = 500;
	static final int SURFACE_HEIGHT = 480;

//	initial sprite positions
//	These coordinates are for the top left corner of the sprite, using the 
//	coordinate system of the surface.  The origin is at the top left corner
//	of the surface.
//	Sprites that have a lower z are drawn in front of the other sprites.
//	WARNING: z does not show prespective.  If Sprite A has a lower z than Sprite B,
//	Sprite A will be drawn in front of Sprite B.  But if you keep increasing Sprite
//	B's z coordinate, Sprite B will NOT get smaller, like it is getting further from you.
	static final int SKY_X = 0;
	static final int SKY_Y = 0;
	static final int SKY_Z = 500;

// 	Sprites can be placed at negative x and y (so the top left corner of the
//  sprite is placed to the left and above the top left corner of the surface)
//	z cannot be negative.
	static final int MIDDLE_X = -120;  
	static final int MIDDLE_Y = 0;
	static final int MIDDLE_Z = 400;

	static final int FLOOR_X = -170;
	static final int FLOOR_Y = 405;
	static final int FLOOR_Z = 300;

	static final int ELVIS_X = 120;
	static final int ELVIS_Y = 165;
	static final int ELVIS_Z = 200;
		
//	file locations for sprite images
	static final String SKY_FILE = "../images/Sky.gif";
	static final String MIDDLE_FILE = "../images/Middle.gif";
	static final String FLOOR_FILE = "../images/Floor.gif";
	static final String ELVIS_FILE = "../images/Ewave1.gif";

//	StaticDataSprites for the applet.  Every visible object in your
//	display is a sprite.
	StaticDataSprite Sky;
	StaticDataSprite Middle;
	StaticDataSprite Floor;
	StaticDataSprite Elvis;

//	awt.Image for Elvis Sprite
	Image ElvisImage;

//	SingleImage for Elvis Sprite
	SingleImage ElvisSource = null;
							 
// 	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("Set Transparency"));
		ButtonPanel.add(new Button("Clear Transparency"));
		
		add("South", ButtonPanel);

//		initialize sprites
		InitSprites();

      	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 "UsingStaticDataSprites v.1.0";
   	}     


/**
 * Event Handler for button clicks.  Set/Clear transparency color.
 * @param evt Event description
 * @param arg String on the face of the button
 */

   	public boolean action(Event evt, Object arg)
   	{
//		set SingleImage transparency depending on button click
 		if (arg.equals("Set Transparency"))
		{
			setTransparency(ElvisImage, ElvisSource);			
		}
		else if (arg.equals("Clear Transparency"))
		{
			ElvisSource.clearTransparency();			
		}
		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;
   	}


/** 
 * Initialize sprites:
 *		Create awt.Image using getImage
 *		Create SingleImage
 *		Set transparancy in SingleImage (if necessary)
 *		Create Sprite
 *		Set Sprite's destination surface
 *		Position Sprite
 */

 	private void InitSprites()
	{
//		awt.Image for SingleImage
		Image image;

//		SingleImage for sprite
		SingleImage spriteSource = null;

//		Initialize Sky sprite
//		create awt.Image
		image = getImage(getDocumentBase(), SKY_FILE);

		try
		{
//			instantiate SingleImage			
			spriteSource = new SingleImage(image);
		}
		catch(InterruptedException e)
		{
			throw new AnimInternalError("Image load timed out");
		}

//		instantiate the sprite
		Sky = new StaticDataSprite();
		Sky.setData(spriteSource);

//		set sprite to surface
		Sky.setDestination(canvas.getSurface());

//		position sprite
		Sky.setPosition(new Point3D(SKY_X, SKY_Y, SKY_Z));

//		Initialize Middle sprite
//		create awt.Image
		image = getImage(getDocumentBase(), MIDDLE_FILE);

		try
		{
//			instantiate SingleImage			
			spriteSource = new SingleImage(image);
		}
		catch(InterruptedException e)
		{
			throw new AnimInternalError("Image load timed out");
		}

//		Set transparency for SingleImage
		setTransparency(image, spriteSource);

//		instantiate the sprite
		Middle = new StaticDataSprite();
		Middle.setData(spriteSource);

//		set sprite to surface
		Middle.setDestination(canvas.getSurface());

//		position sprite
		Middle.setPosition(new Point3D(MIDDLE_X, MIDDLE_Y, MIDDLE_Z));


//		Initialize Floor sprite
//		create awt.Image
		image = getImage(getDocumentBase(), FLOOR_FILE);

		try
		{
//			instantiate SingleImage			
			spriteSource = new SingleImage(image);
		}
		catch(InterruptedException e)
		{
			throw new AnimInternalError("Image load timed out");
		}

//		Set transparency for SingleImage
		setTransparency(image, spriteSource);

//		instantiate the sprite
		Floor = new StaticDataSprite();
		Floor.setData(spriteSource);

//		set sprite to surface
		Floor.setDestination(canvas.getSurface());

//		position sprite
		Floor.setPosition(new Point3D(FLOOR_X, FLOOR_Y, FLOOR_Z));

//		Initialize Elvis sprite
//		create awt.Image
		ElvisImage = getImage(getDocumentBase(), ELVIS_FILE);

		try
		{
//			instantiate SingleImage			
			ElvisSource = new SingleImage(ElvisImage);
		}
		catch(InterruptedException e)
		{
			throw new AnimInternalError("Image load timed out");
		}

//		Set transparency for SingleImage
		setTransparency(ElvisImage, ElvisSource);

//		instantiate the sprite
		Elvis = new StaticDataSprite();
		Elvis.setData(ElvisSource);

//		set sprite to surface
		Elvis.setDestination(canvas.getSurface());

//		position sprite
		Elvis.setPosition(new Point3D(ELVIS_X, ELVIS_Y, ELVIS_Z));
	}


/**
 * Set transparency color of spriteSource to the color of the 
 * first pixel in spriteImage.                
 * @param spriteImage Retrieve color of first pixel in this image
 * @param spriteSource Set transparency color of this singleImage
 */

	private static void setTransparency(Image spriteImage, SingleImage spriteSource)
	{
//		first pixel of spriteImage	
		int pixel[] = new int[1];
//		PixelGrabber that retrives first pixel
		PixelGrabber pg = new PixelGrabber(spriteImage,   	// image
														0, 	// x
														0, 	// y
														1, 	// width
														1, 	// height
														pixel, // array to hold the pixels 
														0, 	// offset into array of pixel(0,0)
														1	// pitch
													 );

//		retrieve pixel
    	try 
    	{
       		pg.grabPixels();
		} 
    	catch (InterruptedException e) 
    	{
        	throw new AnimInternalError("PixelGrabber interrupted");
        }

//		determine pixel color
		Color color = new Color(pixel[0]);
//		set spritesource transparency color
		spriteSource.setTransparencyColor(color);    	 				   		
	}	  

   
}  	// applet UsingStaticDataSprites