Name: yyT116575 Date: 11/03/2000


java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

Following code bugs on 16bpp colormode@win2k. Works great on 32bpp colour.
Sourcecode :

/*
<applet height=320 width=640 code=bugdemo.class></applet>
Demonstration applet for Windows Appletviewer image scaling on 16bpp displaycards
Tero R?nkk?
Geological survey of Finland
###@###.### / ###@###.###


problem: If you use 16bpp display `(high color) on windows (windows 2000 atleast)
with appletviewer you'll get wrong colours on scaled (resized image).
It works correctly on IE+Javaplugin and in 32bpp colour mode.
You can change colour mode by pressing right mouse button on your
desktop -> properties -> settings.

Bigger image on applet is scaled image of smaller one on top of it. You
can draw on bigger image and see.

*/



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



public class bugdemo extends Applet {
private Image drawingImage;
private Image zoomedImage;
private Image currentImage;
private Graphics drawingImageGraphics;
private Graphics zoomedImageGraphics;
private Graphics currentImageGraphics;

private Color bColor = new Color(110, 153, 107); // Colours of background and foreground
private Color fColor = new Color(200,50,50);

private static int ORIGINALXSIZE = 100;
private static int ORIGINALYSIZE = 50;
private static int ZOOM = 4; // How much do we want to zoom?
private static int ZOOMAREAXLOC = 102; //location of zoomed image
private static int ZOOMAREAYLOC = 125;
private static int ORIGINALIMAGEXLOC = 260; //Location of original image
private static int ORIGINALIMAGEYLOC = 64;
private int tempX;
private int tempY;
private int tempXM;
private int tempYM;


public void init(){

drawingImage = createImage( ORIGINALXSIZE , ORIGINALYSIZE );
currentImage = createImage( ORIGINALXSIZE , ORIGINALYSIZE );
drawingImageGraphics = drawingImage.getGraphics();
zoomedImage = createImage( ORIGINALXSIZE * ZOOM , ORIGINALYSIZE * ZOOM );
zoomedImageGraphics = zoomedImage.getGraphics();
currentImageGraphics = currentImage.getGraphics();
currentImageGraphics.setColor(bColor);
currentImageGraphics.fillRect(0,0,ORIGINALXSIZE,ORIGINALYSIZE); //Clear rect
  drawingImageGraphics.setColor(bColor);
drawingImageGraphics.fillRect(0,0,ORIGINALXSIZE,ORIGINALYSIZE); //Clear rect
currentImageGraphics.setColor(fColor);
drawingImageGraphics.setColor(fColor);


this.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseReleased(MouseEvent e) {
This_mouseReleased(e);
}
public void mousePressed(MouseEvent e) {
This_mousePressed(e);
      }
});
this.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
public void mouseMoved(MouseEvent e) {
         This_mouseMoved(e);
}
       public void mouseDragged(MouseEvent e) {
This_mouseDragged(e);
       }
});


}


public void paint(Graphics g)
{
g.drawImage(drawingImage ,ORIGINALIMAGEXLOC , ORIGINALIMAGEYLOC ,null);

zoomedImageGraphics.drawImage(drawingImage,0,0,ORIGINALXSIZE *ZOOM,ORIGINALYSIZE * ZOOM,null);
g.drawImage(zoomedImage ,ZOOMAREAXLOC , ZOOMAREAYLOC ,null);

}

//Update using double buffering
public void update(Graphics g) {
Graphics offgc;
Image offscreen = null;
Rectangle box = g.getClipRect();

// create the offscreen buffer and associated Graphics
offscreen = createImage(box.width, box.height);
offgc = offscreen.getGraphics();
// clear the exposed area
offgc.setColor(getBackground());
offgc.fillRect(0, 0, box.width, box.height);
offgc.setColor(getForeground());
// do normal redraw
offgc.translate(-box.x, -box.y);
paint(offgc);
// transfer offscreen to window
g.drawImage(offscreen, box.x, box.y, this);
}

private void drawPoint(int x, int y){
drawingImageGraphics.drawLine( (x - ZOOMAREAXLOC + 1) /
(ZOOM ) , (y - ZOOMAREAYLOC + 1 ) / (ZOOM ),(x - ZOOMAREAXLOC + 1) / (ZOOM ) ,
(y - ZOOMAREAYLOC + 1 ) / (ZOOM ));
this.repaint(x - (ZOOM + 1) ,y - (ZOOM + 1) ,ZOOM * 3,ZOOM * 3);
}



//EVENTHANDLERS
 
///////////////////////////////////////////////////////////////////////////////////////////////
 
void This_mouseReleased(MouseEvent e) {
currentImageGraphics.drawImage(drawingImage,0,0,null);
this.repaint();
}
 
void This_mousePressed(MouseEvent e){
int x = e.getX();
int y = e.getY();
if ( x > ZOOMAREAXLOC && x < (ZOOMAREAXLOC + (ORIGINALXSIZE *
ZOOM)) && y > ZOOMAREAYLOC && y < (ZOOMAREAYLOC + (ORIGINALYSIZE * ZOOM))) {
drawingImageGraphics.drawImage(currentImage,0,0,null);
tempX = e.getX();
tempY = e.getY();
drawPoint(tempX,tempY);

}

}
 
void This_mouseDragged(MouseEvent e){

int x = e.getX();
int y = e.getY();
if ( x > ZOOMAREAXLOC && x < (ZOOMAREAXLOC + (ORIGINALXSIZE *
ZOOM)) && y > ZOOMAREAYLOC && y < (ZOOMAREAYLOC + (ORIGINALYSIZE * ZOOM))) {
drawPoint(x,y);
} //END IF
}

void This_mouseMoved(MouseEvent e){
int x = e.getX();
int y = e.getY();
tempXM = e.getX();
tempYM = e.getY();
if ( x > ZOOMAREAXLOC && x < (ZOOMAREAXLOC + (ORIGINALXSIZE *
ZOOM)) && y > ZOOMAREAYLOC && y < (ZOOMAREAYLOC + (ORIGINALYSIZE * ZOOM))) {
drawingImageGraphics.drawImage(currentImage,0,0,null);
drawPoint(x,y);
this.repaint();
}

}

} //END CLASS
(Review ID: 109849)
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