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  draws a big image scaled to its width-height as specified
Thu Feb 07, 2013 8:43 pm 

draws a big image scaled to its width and height as specified in applet tag.
java code
/*
* Copyright (c) 1995-1997 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
/*
* 1.0 code.
*/

import java.applet.*;
import java.awt.*;
import java.awt.image.ImageObserver;

public class ImageUpdater extends Applet {
/*
* Written by Jim Graham.
* This applet draws a big image scaled to its width and height as
* specified in the <APPLET> tag, and a small image scaled by the
* same ratio as the big image and positioned in the center of it.
*/
Image bigimg, smallimg;
int smallx, smally, smallw, smallh;
boolean sizeknown = false;
boolean errored = false;

public void init() {
bigimg = getImage(getCodeBase(), "../Big.gif");
smallimg = getImage(getCodeBase(), "../Small.gif");
positionImages();
}

public boolean imageUpdate(Image theimg, int infoflags,
int x, int y, int w, int h) {
if ((infoflags & (ERROR)) != 0) {
errored = true;
}
if ((infoflags & (WIDTH | HEIGHT)) != 0) {
positionImages();
}
boolean done = ((infoflags & (ERROR | FRAMEBITS | ALLBITS)) != 0);
// Repaint immediately if we are done, otherwise batch up
// repaint requests every 100 milliseconds
repaint(done ? 0 : 100);
return !done;
}

public synchronized void positionImages() {
Dimension d = size();
int bigw = bigimg.getWidth(this);
int bigh = bigimg.getHeight(this);
smallw = smallimg.getWidth(this);
smallh = smallimg.getHeight(this);
if (bigw < 0 || bigh < 0 || smallw < 0 || smallh < 0) {
return;
}
smallw = smallw * d.width / bigw;
smallh = smallh * d.height / bigh;
smallx = (d.width - smallw) / 2;
smally = (d.height - smallh) / 2;
sizeknown = true;
}

public synchronized void paint(Graphics g) {
Dimension d = size();
int appw = d.width;
int apph = d.height;
if (errored) {
// The images had a problem - just draw a big red rectangle
g.setColor(Color.red);
g.fillRect(0, 0, appw, apph);
return;
}
// Scale the big image to the width and height of the applet
g.drawImage(bigimg, 0, 0, appw, apph, this);
if (sizeknown) {
// Scale the small image to the central region calculated above.
g.drawImage(smallimg, smallx, smally, smallw, smallh, this);
}
}
}




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