import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import java.net.URL;

public class ImageApplet extends Applet implements Runnable, MouseListener {
    volatile Thread runner;
    Vector imageVector = new Vector(), urlVector = new Vector();
    boolean scroll = false;
    int index = 1, yValue = 0;
    boolean drawn = false;
    Graphics g2;
    Image buf;
    int frameDelay = 20, stopDelay = 5000;

    public void init() {
	int i = 1;
	String param;
	while ((param = getParameter("image" + 
				     new Integer(i).toString())) != null) {
	    Image image = getImage(getCodeBase(), param);
	    imageVector.add(image);
	    urlVector.add(null);
	    ++i;
	}
	int j = 1;
	while (j < i) {
	    param = getParameter("url" + 
				 new Integer(j).toString());
	    if (param == null)
		{
		    ++j;
		    continue;
		}
	    URL url = null;
	    try { url = new URL(param); }
	    catch (Exception e)
		{
		    ++j;
		    continue;
		};

	    urlVector.set(j - 1, url);
	    System.err.println(url.toString());
	    ++j;
	}

	buf = createImage(getWidth(), getHeight());
	g2 = buf.getGraphics();
	param = getParameter("framedelay");
	if (param != null)
	    {
		try {
		    frameDelay = Integer.parseInt(param);
		} catch (Exception e) { frameDelay = 20; }
	    }
	param = getParameter("stopdelay");
	if (param != null)
	    {
		try {
		    stopDelay = Integer.parseInt(param);
		} catch (Exception e) { stopDelay = 5000; }
	    }
	addMouseListener(this);
    }

    public void start() {
	runner = new Thread(this);
	runner.start();
    }

    public void stop() {
	runner = null;
    }

    public void paint(Graphics g) {
        update(g);
    }

    public void update(Graphics g) {
	g2.fillRect(0, 0, getWidth(), getHeight());
	if (drawn)
	    g2.drawImage((Image) imageVector.elementAt(index), 0, 0,
			 getWidth(), getHeight(), Color.white, this);
	else {
	    g2.drawImage((Image) imageVector.elementAt(index), 0, 0,
			 getWidth(), getHeight() - yValue, Color.white, this);
	    int index2 = index + 1;
	    if (index2 + 1 > imageVector.size())
		index2 = 0;

	    g2.drawImage((Image) imageVector.elementAt(index2),
			 0, getHeight() - yValue,
			 getWidth(), yValue, Color.white, this);
	}
	g.drawImage(buf, 0, 0, getWidth(), getHeight(), Color.white, this);
    }

    public void run() {

	while(true) {	
	    while (!drawn) {
		try {
		    Thread.sleep(frameDelay);
		} catch (Exception e) { ; }
		++yValue;
		repaint();
		if (yValue > getHeight()) {
		    yValue = 0;
		    drawn = true;
		}
	    }
	    index = (index + 1 < imageVector.size()) ? index + 1 : 0;
	    try {
		Thread.sleep(stopDelay);
	    } catch (Exception e) { ; }
	    drawn = false;
	}
    }

    public void mouseClicked(MouseEvent e) {

	if (e.getY() < getHeight() - yValue)
	    {
		if (urlVector.elementAt(index) != null)
		    {
			getAppletContext().showDocument((URL) urlVector.elementAt(index));
			System.err.println(urlVector.elementAt(index).toString());
			System.err.println(index);
		    }
	    }
	else
	    {
		int num = (index + 1 < imageVector.size()) ? index + 1 : 0;
		if (urlVector.elementAt(num) != null) {
		    getAppletContext().showDocument((URL) urlVector.elementAt(num));
			System.err.println(urlVector.elementAt(num).toString());
			System.err.println(num);
		}
	    }
    }

    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    public void mousePressed(MouseEvent e) {} 
    public void mouseReleased(MouseEvent e) {}
}