//********************************************************************************
// Panorama.java
//
// Java 1.1
//
// (c) 2000 Maeda Mameo     http://hw001.gate01.com/frog/
//********************************************************************************

import java.applet.Applet;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Image;

import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import java.awt.image.ImageObserver;

//********************************************************************************

public class Panorama extends Applet implements Runnable, MouseListener, MouseMotionListener{

	private int theWidth, theHeight, argWidth, argHeight, mouseX, mouseY;
	private Image imageOff, argImage;
	private Graphics gOff;

	private Thread theThread;

//********************************************************************************

	public void init(){
		Dimension d;

		argHeight = 0;
		mouseY = -1;

		d = getSize();
		theWidth = d.width;
		theHeight = d.height;
		imageOff = createImage( theWidth, theHeight);
		gOff = imageOff.getGraphics();

		argImage = getImage( getDocumentBase(), getParameter( "image"));
		if( prepareImage( argImage, this)){
			argWidth = argImage.getWidth( this);
			argHeight = argImage.getHeight( this);
		}

		addMouseListener( this);
		addMouseMotionListener( this);
	}

	public void start(){ theThread = new Thread( this); theThread.start();}
	public void stop(){ theThread.stop(); theThread = null;}

	public void update( Graphics g){ paint( g);}
	public void paint( Graphics g){	g.drawImage( imageOff, 0, 0, this);}

	public boolean imageUpdate( Image img, int infoflags, int x, int y, int width, int height){
		if( img == argImage && ( infoflags & ImageObserver.ALLBITS) != 0){
			argWidth = argImage.getWidth( this);
			argHeight = argImage.getHeight( this);
			return false;
		}
		return true;
	}

	public void mouseClicked( MouseEvent e){}
	public void mouseEntered( MouseEvent e){ mouseX = e.getX(); mouseY = e.getY();}
	public void mouseExited( MouseEvent e){ mouseY = -1;}
	public void mousePressed( MouseEvent e){}
	public void mouseReleased( MouseEvent e){}
	public void mouseMoved( MouseEvent e){ mouseX = e.getX(); mouseY = e.getY();}
	public void mouseDragged( MouseEvent e){}

//********************************************************************************

	public void run(){
		int x, y, peepX, peepY, vx;
		String s;
		FontMetrics fm;

		s = "loading...";
		fm = gOff.getFontMetrics();
		x = ( theWidth - fm.stringWidth( s)) / 2;
		y = ( theHeight + fm.getMaxAscent()) / 2;

		while( argHeight == 0){
			gOff.setColor( Color.gray);
			gOff.fillRect( 0, 0, theWidth, theHeight);
			repaint();
			sleeper( 200);
			gOff.setColor( Color.black);
			gOff.drawString( s, x, y);
			repaint();
			sleeper( 300);
		}

		peepX = peepY = vx = 0;

		while( true){
			if( 0 <= mouseY){
				vx = ( 1200 * mouseX / theWidth - 600);
				peepY += ( 1200 * mouseY / theHeight - 600);
			} else{
				if( vx < 300) vx += 3; else vx -= 3;
			}
			peepX += vx;
			
			if( peepX < 0) peepX += argWidth * 100;
			if( argWidth * 100 <= peepX) peepX -= argWidth * 100;
			if( peepY < 0) peepY = 0;
			if( ( argHeight - theHeight) * 100 < peepY) peepY = ( argHeight - theHeight) * 100;

			x = peepX / 100;
			y = peepY / 100;

			if( x < argWidth - theWidth)
				gOff.drawImage( argImage, 0, 0, theWidth, theHeight, x, y, x + theWidth, y + theHeight, Color.gray, this);
			else{
				gOff.drawImage( argImage, 0, 0, argWidth - x, theHeight, x, y, argWidth, y + theHeight, Color.gray, this);
				gOff.drawImage( argImage, argWidth - x, 0, theWidth, theHeight, 0, y, theWidth - argWidth + x, y + theHeight, Color.gray, this);
			}
			repaint();
			sleeper( 20);
		}
	}

//********************************************************************************

	private void sleeper( long t){ try{ Thread.sleep( t);} catch( InterruptedException e){};}

//********************************************************************************

}