import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.util.*;

class RotateCanvas extends Canvas implements Runnable {
	
Image[] img;

ActionListener[] al;
int countListeners = 0;
boolean done = false;
int curNum = 0;
Color sfondo;

public final static int MAX_LISTENERS = 10;
	
public RotateCanvas(Image image, Color sfondo) {
	super();
	img = new Image[4];
	this.sfondo = sfondo;
	this.img[0] = image;
	al = new ActionListener[MAX_LISTENERS];
	Thread t = new Thread(this);
	t.start();
}

public void run() {
	PixelGrabber pg = new PixelGrabber(img[0], 0, 0, img[0].getWidth(null), img[0].getHeight(null), true);
	try {
		pg.grabPixels();
	} catch(InterruptedException e) { }
	int[] pix = (int[]) pg.getPixels();
	int[] copy = new int[pix.length];
	
	int w = img[0].getHeight(null);
	int h = img[0].getWidth(null);
	int count = 0;
	for(int col = (w-1); col>=0; col-=1) {
		for(int riga = 0; riga<h; riga++) {
			copy[col + riga*w] = pix[count++];
		}
	}
	MemoryImageSource mis = new MemoryImageSource(w, h, copy, 0, w);
	img[1] = createImage(mis);
	MediaTracker mt = new MediaTracker(this);
	mt.addImage(img[1], 0);
	try {
		mt.waitForAll();
	} catch(InterruptedException e) { }
	pix = copy;
	
	copy = new int[pix.length];
	w = img[1].getHeight(null);
	h = img[1].getWidth(null);
	count = 0;
	for(int col = (w-1); col>=0; col-=1) {
		for(int riga = 0; riga<h; riga++) {
			copy[col + riga*w] = pix[count++];
		}
	}
	mis = new MemoryImageSource(w, h, copy, 0, w);
	img[2] = createImage(mis);
	mt = new MediaTracker(this);
	mt.addImage(img[2], 0);
	try {
		mt.waitForAll();
	} catch(InterruptedException e) { }
	pix = copy;

	copy = new int[pix.length];
	w = img[2].getHeight(null);
	h = img[2].getWidth(null);
	count = 0;
	for(int col = (w-1); col>=0; col-=1) {
		for(int riga = 0; riga<h; riga++) {
			copy[col + riga*w] = pix[count++];
		}
	}
	mis = new MemoryImageSource(w, h, copy, 0, w);
	img[3] = createImage(mis);
	mt = new MediaTracker(this);
	mt.addImage(img[3], 0);
	try {
		mt.waitForAll();
	} catch(InterruptedException e) { }
	pix = copy;
		
	ActionEvent ae = new ActionEvent(this, 0, "Immagini pronte!");
	for(int i=0; i<countListeners; i++) {
		al[i].actionPerformed(ae);
	}	
	done = true;
	repaint();
}

public void update(Graphics g) { paint(g); }
public void paint(Graphics g) {
	if(!done) {
		g.setColor(sfondo);
		g.fillRect(0, 0, getSize().width, getSize().height);
		g.setColor(Color.yellow);
		g.drawString("Preparazione delle immagini.", 20, getSize().height/2 - 10);
		g.drawString("Attendere prego...", 20, getSize().height/2 + 10);
		g.setColor(Color.cyan);
		g.drawString("MindFlavor :-)", 5, getSize().height-20);
	} else {
		g.setColor(sfondo);
		g.fillRect(0, 0, getSize().width, getSize().height);
		g.drawImage(img[curNum], 0, 0, null);
	}
}

public void rotate() {
	if(++curNum >= 4)
		curNum = 0;
	repaint();
}

public void addActionListener(ActionListener listener) throws TooManyListenersException {
	if(countListeners >= MAX_LISTENERS)
		throw new TooManyListenersException("Massimo == " + MAX_LISTENERS);
	else
		al[countListeners++] = listener;
}
	
	

}