/* WhiteNoise Applet
 * (C) 2000 by Mark Ganson
 * Freeware
 * http://www.bigfoot.com/~java4free
 *
 * You can modify this code for your own purposes, but please leave the above
 * copyright lines in place and provide your own "modified by:" lines below.
 *
 * 
 */


import java.awt.*;
import java.applet.*;
import java.util.Random;
import java.net.*;

public class WhiteNoise extends Applet implements Runnable{

	Image imagePrettyCool = null;
	Image imageVisibleLink = null;
	Image imageBackground = null;
	Image imageLink = null;
	Image imageLink2 = null;
	Thread threadAnimate = null;
	Image imageOffScreen = null;
	final int NUMIMAGES = 12;
	Image myImages[] = new Image[NUMIMAGES];
	int nCurrentImage = 0;
	boolean bRunning = false;
	boolean bImagesReady = false;
	boolean bImagePreparationBegan = false;
	Graphics graphicsOffScreen = null;
	int nDelay = 50; //very short delay
	int nImageWidth = 100;
	int nImageHeight = 85;
	Random random;
	int nGranularity = 1;
	Button statusButton;
	Button nameButton;
	Button authorButton;
	Button siteButton;
	Image imageBuffer;
	Graphics graphicBuffer;
	AudioClip audioClip = null;

	public void init(){

		setBackground(Color.white);
		
		imagePrettyCool = getImage(getCodeBase(), "prettycool.gif");
		imageBackground = getImage(getCodeBase(), "tvimage.gif");
		imageLink = getImage(getCodeBase(), "whitenoiselink.gif"); //blue hyperlink image
		imageLink2 = getImage(getCodeBase(), "whitenoiselink2.gif"); //red hyperlink image
		MediaTracker tracker = new MediaTracker(this);
		tracker.addImage(imageBackground, 0);
		tracker.addImage(imageLink, 0);
		tracker.addImage(imageLink2, 0);
		tracker.addImage(imagePrettyCool, 0);
		try {
			tracker.waitForAll();
		} catch (InterruptedException ie){

		}
		
		imageVisibleLink = imageLink;
		random = new Random();
		nameButton = new Button  ("WhiteNoise Applet, by Mark Ganson");

		siteButton = new Button("http://www.bigfoot.com/~java4free");

		setLayout(new BorderLayout());
		add(nameButton, "North");

		add(siteButton, "South");


		statusButton = new Button("Scanning available channels:  ");
		add(statusButton, "Center");
		
		imageBuffer = createImage(100+nImageWidth * 2, 100+nImageHeight * 2);
		graphicBuffer = imageBuffer.getGraphics();

	}

   public void start() {
        //Start animating!
		bRunning = true;
		threadAnimate = new Thread(this);
		threadAnimate.start();
		
  
    }
	public void stop(){
		bRunning = false;
		threadAnimate = null;
		graphicsOffScreen = null;
		imageOffScreen = null;
		graphicBuffer = null;
		audioClip.stop();
	}

  public void run() {
        //Just to be nice, lower this thread's priority
        //so it can't interfere with other processing going on.
        Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
 
        //Remember the starting time.
        long startTime = System.currentTimeMillis();

        //This is the animation loop.
        while (Thread.currentThread() == threadAnimate) {
            
            

            //Display it.

			if (!bImagePreparationBegan){
				initializeImages();
				try{
					audioClip = getAudioClip(new URL(getCodeBase(), "white.au"));
				} catch (MalformedURLException me){
					System.out.println(me.toString());
				}
				
				audioClip.loop();
				remove(nameButton);
				remove(siteButton);
				remove(statusButton);
			} else {
				repaint();
			}



            //Delay depending on how far we are behind.
            try {
                startTime += nDelay;
                Thread.sleep(Math.max(0, 
                                      startTime-System.currentTimeMillis()));
            } catch (InterruptedException e) {
                break;
            }
        }
    }



	int getRandomPrimaryColor(){
		int nRetVal = (int)(random.nextFloat() * 255);


		return nRetVal;

	}

	Color nextColor(){
		int nPrimaryColor = getRandomPrimaryColor();
		return new Color(nPrimaryColor, nPrimaryColor, nPrimaryColor);
	}

	public void initializeImages(){

		
		bImagePreparationBegan = true;
		bImagesReady = false;
		for (int i=0; i<NUMIMAGES; i++){
			
			String strLabel = "Scanning available channels:  " + new Integer(NUMIMAGES-1 -i).toString();
			if (i==NUMIMAGES-1){
				statusButton.setForeground(Color.red);
				strLabel = "Please check antenna connection!";

			}
			statusButton.setLabel(strLabel);
			myImages[i] = createImage(nImageWidth, nImageHeight);
			graphicsOffScreen = myImages[i].getGraphics();

			for (int x=0; x < nImageWidth; x+=nGranularity){
				for (int y=0; y < nImageHeight; y+=nGranularity){
					graphicsOffScreen.setColor(nextColor());
					graphicsOffScreen.fillRect(x, y, nGranularity, nGranularity);
				}
			}		
		}
		bImagesReady = true;
	}

	public boolean mouseExit(Event e, int x, int y){

		imageVisibleLink = imageLink;
		return true;


	}

	public boolean mouseUp(Event e, int x, int y){
		if (y > 200){
			try {
				getAppletContext().showDocument(new URL("http://www.bigfoot.com/~java4free"), "_blank");
			} catch (MalformedURLException me){

			}	
			return true;
		} else {
			if (bRunning){
				stop();
			} else {
				start();
			}
			return true;
		}

	}


	public boolean mouseMove(Event e, int x, int y){

		if (y > 200){
			Cursor myHandCursor = new Cursor(Cursor.HAND_CURSOR);
			setCursor(myHandCursor);
			imageVisibleLink = imageLink2;
			return true;
		} else if (y < 200 && x > 250) {
			imageVisibleLink = imagePrettyCool;
			return true;
		} else {
			setCursor(Cursor.getDefaultCursor());
			imageVisibleLink = imageLink;
			return true;
		}

	}

	public boolean action(Event e, Object arg){

		if (e.target==siteButton){
			try {
				getAppletContext().showDocument(new URL("http://www.bigfoot.com/~java4free"), "_blank");
			} catch (MalformedURLException me){

			}
			return true;
		} else {
			return false;
		}
	}

	public void paint(Graphics g){
		
	}

	public void update(Graphics g){

		if (imageBuffer == null || graphicBuffer == null){
			imageBuffer = createImage(100+ nImageWidth * 2, 100+nImageHeight * 2);
			graphicBuffer = imageBuffer.getGraphics();
		}



		
		if (nCurrentImage < NUMIMAGES-4){

			graphicBuffer.drawImage(myImages[nCurrentImage], 25, 25, null);
			graphicBuffer.drawImage(myImages[nCurrentImage+1], 25+nImageWidth,25, null);
			graphicBuffer.drawImage(myImages[nCurrentImage+2], 25+nImageWidth, 25+nImageHeight, null);
			graphicBuffer.drawImage(myImages[nCurrentImage+3], 25, 25+nImageHeight, null);
			graphicBuffer.drawImage(imageBackground, 0, 0, null);
			graphicBuffer.drawImage(imageVisibleLink, 0, 200, null);
			g.drawImage(imageBuffer, 0, 0, null);
			nCurrentImage++;
			
		} else {
			nCurrentImage = 0;
		}

	}

}