package zoom2;

import java.applet.Applet;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.CropImageFilter;
import java.awt.MediaTracker;
import java.net.URL;
import java.net.MalformedURLException;


public class Zoom2 extends Applet implements ActionListener, Runnable 
{
Object iLCK = new Object();
MediaTracker md;
Image srcImg=null,wriImg=null;
Dimension srcSz=null,apltSz=null;
String mess_str=null;
Thread thread;
//boolean thread_stop=false;
int srcW,srcH;
private PxlImage Pxim=null;

	public void actionPerformed(ActionEvent e) {
	
	}

	public void run() 
	{
	CropImageFilter crop=null;
	int ci,stage;
		
	  while(true) {
		if (md.isErrorAny()) {
		  mess_str = "[ERROR] status=" + 
		  md.statusID(0, false);
		  repaint();
		  return;
		  }
		 else if (md.checkAll(true)) {
		  break;
		  }
		 try {
		  Thread.sleep(100);
		  }
		 catch (InterruptedException e) {
		  e.printStackTrace();
		  }
		}
	  srcW=srcImg.getWidth(null);
	  srcH=srcImg.getHeight(null);
	  srcSz =new Dimension(srcW,srcH);
	  //prev_loop();

      Pxim=new PxlImage(srcImg);
      Pxim.create_cropBuffer(apltSz.width,apltSz.height);
	  repliScale(0);
	  stage=0;
	  mess_str = null;
	  while(true) {
		if (mess_str!=null) break;
		// Do something...
		stage=do_repaint(stage);
		if (stage==2) break;
		
        sleeper(stage);
		}//while(1){...
	}


	 private void sleeper(int stage)
	 {
	 int sleeptime;
     
	  while(true) {
	   if (stage==0) { sleeptime=500; break; } 
	   if (stage==1) { sleeptime=50; break; } 
	   sleeptime=100; break;
	   }
    
	 try { Thread.sleep(sleeptime); }
	 catch (InterruptedException e) {
	   e.printStackTrace();
	   }
	
	 }



	//synchronized int do_repaint(int stage) 
	int do_repaint(int stage) 
	{
	int ci;
		
	 if (stage==0) {
	   stage=repliScale(stage);
	   }
	  else {
	   ci=get_croppedImage(1,1);
	   if (ci!=0x0000) {
		 stage=2; return(stage);
		 }
	   } 
	 repaint();
		 
	return(stage);
	}
	
	
	private int  preX=0,preY=0;
	private int  direX=1,direY=1;
	private int get_croppedImage(int x, int y)
	{
    int endf;
    Image wri2Img;
    
	 endf=0x0000;
	 preX+=x*direX;
	 preY+=y*direY;
	 if ((preX+apltSz.width)>=srcW) { preX=srcW-apltSz.width; direX=-1; } 
	 if (preX<0) { preX=0; direX=1; } 
	 if ((preY+apltSz.height)>=srcH) { preY=srcH-apltSz.height; direY=-1; } 
	 if (preY<0) { preY=0; direY=1; } 
	
     //wri2Img=Pxim.get_croppedImage(preX,preY,srcW-x,srcH-y);
     synchronized (iLCK) { 
       wriImg=Pxim.get_croppedImage(preX,preY);
   	   }  
       //System.out.println("executing...");
	 
    return(endf);
	}
    
    
	private int rStep=5;
	public int repliScale(int stage)
	{
     
     synchronized (iLCK) { 
       wriImg=Pxim.get_croppedImage_stepby(0,0,rStep);
       }  
	 if (rStep<=1) return(stage+1); // Go next step
	 rStep--;
       
	return(stage);	
	}
    
    
	public void destroy() 
	{
	}

	public void init() 
	{
	String file,tmp;
	URL url=null;
      
	 mess_str = "init() start...";	
	 setVisible(true);
	 // show() is deprecated

	 file=getParameter("file");
	 if (file == null) { file="dummy.jpg";}

	 tmp=getParameter("url");
	 if (tmp == null) { url=getDocumentBase(); }
	  else { 
	   try { url=new URL(tmp); }
	   catch (MalformedURLException e) {
		e.printStackTrace();
		}
	   } 
	 srcImg = getImage(url, file);
	  
	 md = new MediaTracker(this);
	 md.addImage(srcImg, 0);
	 mess_str = "Loading NOW...";	
	 
	 apltSz=getSize();
	 // applet•� : apltSz.width
	 //       �‚ �F apltSz.height
	
	return;
	}

		
	public void start() 
	{
	 if (thread == null) {
	   thread = new Thread(this);
	   thread.start();
	   }
	}


	public void stop()
	{
	 //if (thread != null) {
	 //  thread.stop();
	 //  thread = null;
	 //  }
	 mess_str="stop() is called";
	}


	//public synchronized void paint(Graphics g) 
	public void paint(Graphics g) 
	{
	if ((wriImg==null)&&(mess_str==null)) {
	  mess_str="wriImg is null";
	  }

	if (mess_str != null) {
	  if (apltSz==null) return;
	  g.setColor(Color.black);
	  g.fillRect(0, 0, 
		apltSz.width-1, apltSz.height-1);
	  g.setColor(Color.cyan);
	  g.drawString(mess_str, 10, 20);
	  }
	 else {
	  synchronized (iLCK) {   
        //g.drawImage(wriImg, 0, 0, this);
		g.drawImage(wriImg, 0, 0, null);
		}
	  }
	}


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


	public void prev_loop()
	{
		wriImg=srcImg;
	}
    
}