/* Applet imager places multiple images on main image 3/31/97*/

import java.awt.*;
import java.awt.image.*;

public class imager extends java.applet.Applet {
    Image image[] = new Image[20] ; // up to 20 images
    Dimension imdim[] = new Dimension[20] ;
    public int images;   // number of images to show.
    public int currentImage;
    public String imagefile[] = new String[20] ;
    Image imb, imo;
    int  w, h, wback, hback, wo, ho;
    int red, green, blue ;
    int xov, yov;     // position of overlay image on main image.
    int xm, ym;      // position of previous mouse position.
    String cols, hexcols ;
       Graphics offGr;
       Image offIm;
    int [] thispixel = new int[1] ;
    Label l1 = new Label("   Overlay Position:                          ") ;
    Label l2 = new Label("   Mouse Position:                            ") ;
    Label l3, l4;
    Font f = new Font("TimesRoman", Font.PLAIN, 12);
    FontMetrics fm=getFontMetrics(f) ;
    MediaTracker tracker ;
    Color bgcolor = Color.white;
       
    public void init () { 
       for (images=0; images<20; images++) {     // get files from Parameters
             imagefile[images]= getParameter("im"+images) ;
             //System.out.println("Valid image: images") ;
              if(imagefile[images]==null)
                break;
              image[images]=getImage(getCodeBase(), imagefile[images]) ;
            }
           images-- ;
            if (images==0) {
              System.out.println("**** no files found **** ") ;
              System.exit(1) ;
             }
            //System.out.println("Image Count: "+images) ;

           setFont(f) ;
           l1.setForeground(Color.yellow) ;
           l1.setBackground(new Color(0,0,150)) ;
             l2.setForeground(Color.yellow) ;
             l2.setBackground(new Color(0,0,150)) ;
           w  = this.size().width;    //applet width
           h  = this.size().height;   //applet height             
           // imb = getImage(getCodeBase(), "back.gif") ;
           tracker = new MediaTracker(this) ;
           //tracker.addImage(imb, 0) ;      
            for (int j =0; j<=images; j++) 
              tracker.addImage(image[j], 0) ;
 
           setLayout(new FlowLayout()) ;

        try{
          tracker.waitForID(0) ;
           }
         catch(InterruptedException e) { 
           return;
           }

     for (int j=0; j<=images; j++) {
       imdim[j] = new Dimension(image[j].getWidth(this), image[j].getHeight(this)) ;
      }   

     currentImage=0 ;
     imo=image[0];  //initial overlay image.
      wo = imdim[0].width ;    // overlay image dimensions.
      ho = imdim[0].height ;
   // wback= imb.getWidth(this) ;   // background image dimensions.
   // hback =  imb.getHeight(this) ;
        wback=w;
        hback=h/2;
    offIm = createImage(wback, hback );  // create buffer for backgnd image.
    offGr = offIm.getGraphics();

   xov = (wback-wo)/2 ;  // upper left corner of initial centered overlay.
   yov = (hback - ho)/2 ;

   add(l1) ;
   add(l2) ;
   // l3=new Label("Background  Image Size:  "+wback +" X " + hback +"  ") ;
   l4=new Label("Overlay  Image Size:  "+wo  +" X " + ho +"  ")  ;
   // add(l3) ;
   add(l4) ;

  }


  public Insets insets() {
       return new Insets(h-6*fm.getHeight(),1,1,1) ;
     }


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


    public void paint (Graphics g) {
       // offGr.drawImage(imb,0,0,this) ;      // overwrite complete screen.
        offGr.fillRect(0,0,wback,hback) ;
        offGr.drawImage(imo,xov,yov,this) ;
        g.drawImage (offIm, 0,0, this);
       l1.setText("   Overlay Position: " + xov + ", " +yov) ;
       l2.setText("   Mouse Position: " + xm + ", " +ym) ;
    }

   public boolean mouseDown(Event evt, int x, int y) {
     xm=x;
     ym=y;
    repaint() ;
    return true ;
    }

    public boolean mouseDrag(Event evt, int x, int y) { 
       if ( (xm>=xov)&&(xm<=(xov+wo))&&(ym>=yov)&&(ym<=(yov+ho)) ) {  //mouse on image?
         xov += (x-xm) ;        // do a relative displacement of image.
         yov += (y-ym) ;
         xm=x  ;         ym=y ;
      }
        else {
            xm=x;
           ym=y;
         }
     repaint() ;
     return true ;
  }

 public boolean keyDown(Event ev, int key) {
   if ( (char)key == 'i' || (char)key =='I') {  
      xov = (wback-wo)/2 ;  // reset to center.
      yov = (hback - ho)/2 ;
     repaint() ;
   }

  else
   if ( (char)key == '+' ) {    // scroll images forward. 
       if (currentImage!=images) 
        changeImage(++currentImage) ;
    }
  else   
   if ( (char)key == '-' ) {   // scroll images backward.
       if (currentImage!=0)
        changeImage(--currentImage) ;
    }
    return true;
 }


 public void changeImage(int i) {
    currentImage=i;     // if called from outside applet.
     if(i<0 || i>images)
       return ;
      imo = image[i] ;
      wo = imdim[i].width ;    // overlay image dimensions.
      ho = imdim[i].height ;
      xov = (wback-wo)/2 ;  // reset to center.
      yov = (hback - ho)/2 ;
    l4.setText("Overlay  Image Size:  "+wo  +" X " + ho +"  ")  ;
     repaint() ;
  } 

   public String getAppletInfo() {
   return "Copyright 1997 Michel Gallant";
  } 



}