Getting the bounds of a windows

Hello all,
I have a jpanel application that i'm creating and i need to take -in some way- the bounds of the panel window (the window that my drawings etc are being displayed). I've tried the "getBounds" method returning a rectangle but all the values of that rectangle were 0. Do you have an idea how to get the bounds of the window at any moment i need them?
Friendly yours,
-John

JFrame.getBounds() works fine for me. Your frame must of course be visible.

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Hello, I have a problem with getting the bounds of a drawn image on a panel...Since it is drawn as graphics, i tried getClipBounds and since my class extends JPanel i tried to get the bounds from the panel but neither of them worked properly. It only gets the bounds of a jframe that contains the panel.Then i tried to put the panel in a layeredpane and then a container; but this time the image disappeared completely. Hope someone can help or tell me what I am doing wrong. Thanks in advance. Here is the code below:
By the way what I am trying to do in this code is basically zooming the image in and out by dragging or the mouse wheel. But I need to get the bounds so that I can use this.
* To change this template, choose Tools | Templates
* and open the template in the editor.
* @author Admin
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.awt.geom.AffineTransform;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.Point2D;
import javax.swing.JFrame;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
public class ZoomDemo extends JPanel {
AffineTransform tx = new AffineTransform();
String imagePath = "D:/Documents and Settings/Admin/Belgelerim/tsrm/resim.jpg";
Image image = Toolkit.getDefaultToolkit().getImage(imagePath);
int width = image.getWidth(this);
int height = image.getHeight(this);
int scrwidth = Toolkit.getDefaultToolkit().getScreenSize().width;
int scrheight = Toolkit.getDefaultToolkit().getScreenSize().height;
double zoomfac = 1.0;
int xAdj;
int yAdj;
int prevY;
double scale = 1.0;
Point pt;
public static int x;
public static int y;
public static int w;
public static int h;
public ZoomDemo() {
this.addMouseWheelListener(new ZoomHandler());
this.addMouseListener(new ZoomHandler());
this.addMouseMotionListener(new ZoomHandler());
repaint();
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.drawImage(image, tx, this);
// x =    (int) g2.getClipBounds().getX();
// y=     (int) g2.getClipBounds().getY();
// w=     (int) g2.getClipBounds().getWidth();
// h=     (int) g2.getClipBounds().getHeight();
// System.out.println(x+" "+y+" "+w+" "+h);
// public int getRectx(){
//    return x;
//public int getRecty(){
//    return y;
//public int getRectw(){
//    return w;
//public int getRecth(){
//    return h;
private class ZoomHandler implements MouseWheelListener,MouseListener, MouseMotionListener {
public void mousePressed(MouseEvent e){
    System.out.println("Mouse Pressed");
xAdj = e.getX();
yAdj = e.getY();
prevY = getY();
public void mouseDragged(MouseEvent e){
       System.out.println("Mouse Dragged");
boolean zoomed = false;
if(e.getY()<prevY){
     zoomfac = zoomfac + 0.1;
     prevY = e.getY();
     zoomed = true;
else if(e.getY()>prevY){
     zoomfac = zoomfac - 0.1;
     prevY = e.getY();
     zoomed = true;
   scale = zoomfac;
Point2D p1 = new Point((int)xAdj-(width/2),(int)yAdj-(height/2));
Point2D p2 = null;
try {
p2 = tx.inverseTransform(p1, null);
} catch (NoninvertibleTransformException ex) {
// should not get here
ex.printStackTrace();
return;
tx.setToIdentity();
tx.translate(p1.getX(), p1.getY());
tx.scale(scale, scale);
tx.translate(-p2.getX(), -p2.getY());
tx.transform(p1, p2);
ZoomDemo.this.revalidate();
ZoomDemo.this.repaint();
public void mouseWheelMoved(MouseWheelEvent e) {
if (e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL) {
Point2D p1 = e.getPoint();
Point2D p2 = null;
try {
p2 = tx.inverseTransform(p1, null);
} catch (NoninvertibleTransformException ex) {
// should not get here
ex.printStackTrace();
return;
scale -= (0.1 * e.getWheelRotation());
scale = Math.max(0.1, scale);
tx.setToIdentity();
tx.translate(p1.getX(), p1.getY());
tx.scale(scale, scale);
tx.translate(-p2.getX(), -p2.getY());
ZoomDemo.this.revalidate();
ZoomDemo.this.repaint();
        public void mouseClicked(MouseEvent e) {
            //throw new UnsupportedOperationException("Not supported yet.");
        public void mouseReleased(MouseEvent e) {
            //throw new UnsupportedOperationException("Not supported yet.");
        public void mouseEntered(MouseEvent e) {
           // throw new UnsupportedOperationException("Not supported yet.");
        public void mouseExited(MouseEvent e) {
           // throw new UnsupportedOperationException("Not supported yet.");
        public void mouseMoved(MouseEvent e) {
           // throw new UnsupportedOperationException("Not supported yet.");
public static void main(String[] args) {
//SwingUtilities.invokeLater(new ZoomDemo());
int scrwidth = Toolkit.getDefaultToolkit().getScreenSize().width;
int scrheight = Toolkit.getDefaultToolkit().getScreenSize().height;
JFrame f = new JFrame("Zoom");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(scrwidth , scrheight);
//JLayeredPane lp = new JLayeredPane();
//f.add(lp);
ZoomDemo zd = new ZoomDemo();
zd.getBounds();
f.add(zd);
//int x = (int) zd.getX();
//int y = (int) zd.getY();
//int w = (int) zd.getWidth();
//int h = (int) zd.getHeight();
//System.out.println(x+" "+y+" "+w+" "+h);
//zd.setBounds(x ,y ,w ,h );
//lp.add(zd, JLayeredPane.DEFAULT_LAYER);
//f.setLocationRelativeTo(null);
f.setVisible(true);
//lp.setVisible(true);
//zd.setVisible(true);
}Edited by: .mnemonic. on May 26, 2009 11:07 PM
Edited by: .mnemonic. on May 27, 2009 11:00 AM

You'll need a stable point in the component to track and orient to the scaling transform(s).
From this you can construct whatever you need in the way of image location and size.
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import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
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    /** MouseAdapter okay in j2se 1.6+ */
    private MouseInputAdapter mia = new MouseInputAdapter() {
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        final int SCALE_STEP = 20;
        double scale = 1.0;
        double lastStep;
        public void mousePressed(MouseEvent e) {
            Point p = e.getPoint();
            center.setLocation(p);
            //System.out.printf("center = [%3d, %3d]%n", p.x, p.y);
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            repaint();
        public void mouseDragged(MouseEvent e) {
            // scale up/down with relative vertical motion
            int step = (e.getY() - center.y)/SCALE_STEP;
            if(step != lastStep) {
                scale += SCALE_INC*((step < lastStep) ? -1 : 1);
                //System.out.printf("step = %3d scale = %.3f%n", step, scale);
                setTransform(scale);
                lastStep = step;
                repaint();
}

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Getting the bounds of a windows

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