Background picture to famous "ImageTest" applet - Is it supid Question?

Question

I would like to see what Pholser will say about this. :)
Is this a dumest question or what ?
Thanks in advance
basisdba
------------------ Repeated----------------------------------------
Hi to all,
I am not sure if you could help on this one or not, but
will be happy to see any responding on this :))
This is the example that I have worked on:
http://java.sun.com/applets/other/ImageTest/index.html
I am trying to add a sold background to this, is this possible?
Thanks in advance
Regards,

Answer 1

Hi Sam and all of you,
Sorry for the delay I am very bussy daily as SAP adminstrator,
if you know what I mean :)
You both are right but with some minor corrections.
You guys are all great after all...
I attached ImageTest.java demo sample with this modification to the
background only...I am trying to add extra code into it to allow
NOT only BLUE/RED swap color but also some more colors, how can I do
that? How can I add black, green, yellow and so on...(stupid nah :) )
Why in the hell "Java Tech.." make the color defining so hard? :)
Or it would be nice to have a 16 color table to choose from...
Thanks again to all of you and I also rewarded your points based
on the most recent "white house" logic! :)))))
Regards,
------------------------------- Start of the code
/*Modified only ImageTest.java Demo
import java.lang.Math.*; // for Spray
import java.awt.*; // note to self - imports CURSOR class
import javax.swing.*; // for ui
import java.awt.image.*; // for images
import java.applet.*; // for sounds
import java.awt.event.*; // for events
import java.net.*; // URL
import java.net.URL;
import java.util.Vector;
import java.awt.geom.*; // for Line2D
import java.util.*; // used for the Vector in the flood fill method
import java.util.StringTokenizer;
public class ImageTest extends Applet {
//Init
public void init()
// Image bg0 = applet.getImage(applet.getDocumentBase(),"images/bg0.gif");
setLayout(new BorderLayout());
add("Center", new ImagePanel(this));
add("North", new ImageHelp());
setVisible(true);
public String getAppletInfo()
return "A simple image manipulation tool.";
class ImageHelp extends Panel {
public ImageHelp() {
setLayout(new GridLayout(6, 1)); //Grid 5 Row and 1 column
//m
// add(new Button("Move"));
//m
add(new Label("test",
Label.CENTER));
add(new Label("Image Move: < > ^ v, or with [L]eft/[R]ight/p/[D]own",
Label.CENTER));
add(new Label("Image Resize: +/-",
Label.CENTER));
add(new Label("Color Filter: T key",
Label.CENTER));
add(new Label("Change Alpha: (Shift)+/-",
Label.CENTER));
add(new Label("Rotate Image: (Shift)<> or (Shift)[L]eft/[R]ight",
Label.CENTER));
System.out.println("");
class ImagePanel extends Panel
Applet applet;
public ImagePanel(Applet app) {
applet = app;
setLayout(new BorderLayout());
Panel grid = new Panel();
grid.setLayout(new GridLayout(1, 1)); //first(row), second (column)
add("Center", grid);
     Image bg0 = applet.getImage(applet.getDocumentBase(),"images/bg0.gif");
     Image fg0 = applet.getImage(applet.getDocumentBase(),"images/ff001.gif");
     grid.add(new ImageCanvas(applet, fg0, bg0, 1.0));
     setBounds(0, 0, 20, 20);
class ImageCanvas
extends Canvas
implements ImageObserver, KeyListener, MouseListener,
MouseMotionListener, FocusListener {
double hmult = 0;
int xadd = 0;
int yadd = 0;
int xprev = 0;
int yprev = 0;
int imgw = -1;
int imgh = -1;
int xoff = 0;
int yoff = 0;
int scalew = -1;
int scaleh = -1;
boolean focus = false;
boolean usefilter = false;
static final int numalphas = 9;
int alpha = numalphas - 1;
static final int numrotations = 8;
int rotation = 0;
ImageFilter colorfilter;
ImageFilter alphafilters[] = new ImageFilter[numalphas];
RotateFilter rotfilters[] = new RotateFilter[numrotations];
Image origimage;
Image curimage, backimage;
Applet applet;
     public BufferedImage currentImage, oldImage, tempImage, storedImage;
Image bg0, bg1, bg2, bgImage;
     public URL URL_STRING;
private int picNo = 0;
public void init()
try {
     bg0 = new ImageIcon(new URL(URL_STRING +"images/bg0.gif")).getImage();
     bg1 = new ImageIcon(new URL(URL_STRING +"images/bg1.gif")).getImage();
     catch (Exception exc)
     {//imgLoad = "Image failed to load";
public ImageCanvas(Applet app, Image img,Image bg0,double mult) {
applet = app;
origimage = img;
backimage = bg0;
hmult = mult;
pickImage();
setBounds(0, 0, 100, 100);
addMouseListener(this);
addMouseMotionListener(this);
addKeyListener(this);
addFocusListener(this);
//1.1 event handling
public void focusGained(FocusEvent e) {
focus = true;
repaint();
public void focusLost(FocusEvent e) {
focus = false;
repaint();
public void keyPressed(KeyEvent e) {
public void keyTyped(KeyEvent e) {
char key = e.getKeyChar();
switch(key)
case 't':
case 'T':
usefilter = !usefilter;
pickImage();
repaint();
e.consume();
break;
case '^':
case '6':
case 'u':
case 'U':
yadd -= 5;
repaint();
e.consume();
break;
case 'v':
case 'V':
case 'd':
case 'D':
yadd += 5;
repaint();
e.consume();
break;
case '>':
case 'R':
rotation--;
if (rotation < 0) {
rotation = numrotations - 1;
pickImage();
scalew = scaleh = -1;
repaint();
e.consume();
break;
case '.':
case 'r':
xadd += 5;
repaint();
e.consume();
break;
case '<':
case 'L':
rotation++;
if (rotation >= numrotations) {
rotation = 0;
pickImage();
scalew = scaleh = -1;
repaint();
e.consume();
break;
case ',':
case 'l':
xadd -= 5;
repaint();
e.consume();
break;
case '+':
if (++alpha > numalphas - 1) {
alpha = numalphas - 1;
pickImage();
repaint();
e.consume();
break;
case '=':
hmult *= 1.2;
scalew = scaleh = -1;
repaint();
e.consume();
break;
case '-':
hmult /= 1.2;
scalew = scaleh = -1;
repaint();
e.consume();
break;
case '_':
if (--alpha < 0) {
alpha = 0;
pickImage();
repaint();
e.consume();
break;
public void keyReleased(KeyEvent e) {
public void mouseClicked(MouseEvent e) {
public void mousePressed(MouseEvent e) {
xprev = e.getX();
yprev = e.getY();
e.consume();
public void mouseReleased(MouseEvent e) {
e.consume();
public void mouseEntered(MouseEvent e) {
requestFocus();
e.consume();
public void mouseExited(MouseEvent e) {
public void mouseDragged(MouseEvent e) {
int x = e.getX();
int y = e.getY();
xadd += x - xprev;
yadd += y - yprev;
xprev = x;
yprev = y;
repaint();
e.consume();
public void mouseMoved(MouseEvent e) {
     //method selects a random image for the child to draw on or colour in
     public void backGroundImage(){
public void paint(Graphics g) {
g.drawImage(backimage, 0, 0, this);
Rectangle r = getBounds();
int hlines = r.height / 10;
int vlines = r.width / 10;
if (imgw < 0) {
imgw = curimage.getWidth(this);
imgh = curimage.getHeight(this);
if (imgw < 0 || imgh < 0) {
return;
if (scalew < 0) {
if (rotation == 0) {
scalew = imgw;
scaleh = imgh;
} else {
Rectangle rect = new Rectangle(0, 0, imgw, imgh);
rotfilters[rotation].transformBBox(rect);
xoff = rect.x;
yoff = rect.y;
scalew = rect.width;
scaleh = rect.height;
scalew = (int) (scalew * hmult);
scaleh = (int) (scaleh * hmult);
xoff = (imgw - scalew) / 2;
yoff = (imgh - scaleh) / 2;
if (imgw != scalew || imgh != scaleh) {
g.drawImage(curimage, xadd + xoff, yadd + yoff,
scalew, scaleh, this);
} else {
g.drawImage(curimage, xadd + xoff, yadd + yoff, this);
static final long updateRate = 100;
public synchronized boolean imageUpdate(Image img, Image bg0,int infoflags,
int x, int y, int w, int h) {
if (img != curimage) {
return false;
boolean ret = true;
boolean dopaint = false;
long updatetime = 0;
if ((infoflags & WIDTH) != 0) {
imgw = w;
dopaint = true;
if ((infoflags & HEIGHT) != 0) {
imgh = h;
dopaint = true;
if ((infoflags & (FRAMEBITS | ALLBITS)) != 0) {
dopaint = true;
ret = false;
} else if ((infoflags & SOMEBITS) != 0) {
dopaint = true;
updatetime = updateRate;
if ((infoflags & ERROR) != 0) {
ret = false;
if (dopaint) {
repaint(updatetime);
return ret;
public synchronized Image pickImage() {
ImageProducer src = origimage.getSource();
if (alpha != numalphas - 1) {
ImageFilter imgf = alphafilters[alpha];
if (imgf == null) {
int alphaval = (alpha * 255) / (numalphas - 1);
imgf = new AlphaFilter(alphaval);
alphafilters[alpha] = imgf;
src = new FilteredImageSource(src, imgf);
if (rotation != 0) {
RotateFilter imgf = rotfilters[rotation];
if (imgf == null) {
double angle = (2 * Math.PI * rotation) / numrotations;
imgf = new RotateFilter(angle);
rotfilters[rotation] = imgf;
src = new FilteredImageSource(src, imgf);
if (usefilter) {
if (colorfilter == null) {
colorfilter = new RedBlueSwapFilter();
src = new FilteredImageSource(src, colorfilter);
Image choice;
if (src == origimage.getSource()) {
choice = origimage;
} else {
choice = applet.createImage(src);
if (curimage != choice) {
if (curimage != null && curimage != origimage) {
curimage.flush();
curimage = choice;
return choice;
class RedBlueSwapFilter extends RGBImageFilter {
public RedBlueSwapFilter() {
canFilterIndexColorModel = true;
public void setColorModel(ColorModel model) {
if (model instanceof DirectColorModel) {
DirectColorModel dcm = (DirectColorModel) model;
int rm = dcm.getRedMask();
int gm = dcm.getGreenMask();
int bm = dcm.getBlueMask();
int am = dcm.getAlphaMask();
int bits = dcm.getPixelSize();
dcm = new DirectColorModel(bits, bm, gm, rm, am);
substituteColorModel(model, dcm);
consumer.setColorModel(dcm);
} else {
super.setColorModel(model);
public int filterRGB(int x, int y, int rgb)
return ((rgb & 0xFF000000)) | ((rgb & 0xff00ff00)|((rgb & 0xff0000) >> 16)| ((rgb & 0xff) << 16)); //
//return ((rgb & 0xff00ff00)|((rgb & 0xff0000) >> 16)| ((rgb & 0xff) << 16)); //
class AlphaFilter extends RGBImageFilter {
ColorModel origmodel;
ColorModel newmodel;
int alphaval;
public AlphaFilter(int alpha) {
alphaval = alpha;
canFilterIndexColorModel = true;
public int filterRGB(int x, int y, int rgb) {
int alpha = (rgb >> 24) & 0xff;
alpha = alpha * alphaval / 255;
return ((rgb & 0x00ffffff) | (alpha << 24));
//------------------------------- End of the code