Need to display image on JPanel

Question

Hello
I am trying to implement a graphical version of the Knights Tour. I am done with the algorithm part of the problem itself. I am having problem with displaying the chess board. Although seemingly straightforward the images will not display on the JPanel. Below is a sample of what I am trying to do. Can anyone explain why the code does not work even though it seems okay. Thanks and best regards.
import javax.swing.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
public class test extends JFrame { 
public test(){ 
panel pane = new panel();
getContentPane().add(pane);
public static void main(String[]args){   
test tst = new test();
tst.setSize(500,500);
tst.show();
public class panel extends JPanel{   // inner class
private Image img;
private ImageIcon icon;
public panel(){
icon = new ImageIcon("cross.gif");
img = icon.getImage();
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
System.out.println("I am here");
g.drawImage(img,40,40,this);
}

Answer 1

package com.lc.util.swing ;
import java.awt.Color ;
import java.awt.Graphics ;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Dimension ;
import java.awt.image.ImageObserver ;
import javax.swing.JPanel;
import javax.swing.border.Border;
* Panel displaying an {@link Image}.
* <ul>
* <li>8 positions,</li>
* <li>
* can stretch image for filling the whole available area, or diminish
* its size if too large in width or height,
* </li>
* <li>respects borders (as defined by
* {@link javax.swing.JComponent#setBorder( javax.swing.border.Border ) JComponent.setBorder}
* </li>
* </ul>
* @author Laurent Caillette
* @version $Revision: 1.1.1.1 $ $Date: 2002/02/19 22:12:04 $
public class JImagePanel extends JPanel {
public JImagePanel() {
imageObserver = this ;
* Constructeur assignant une image.
public JImagePanel( Image image ) {
this() ;
setImage( image ) ;
private Image image ;
private ImageObserver imageObserver ;
public void setImage( Image image ) {
this.image = image ;
adjustPreferredSize();
public void setBorder( Border newBorder ) {
super.setBorder( newBorder ) ;
adjustPreferredSize() ;
private void adjustPreferredSize() {
if( image != null ) {
int w = image.getWidth( imageObserver ) ;
int h = image.getHeight( imageObserver ) ;
Border border = getBorder() ;
if( border != null ) {
Insets insets = border.getBorderInsets( this ) ;
if( insets != null ) {
w += ( insets.left + insets.right ) ;
h += ( insets.top + insets.bottom ) ;
Dimension dim = new Dimension( w, h ) ;
this.setPreferredSize( dim ) ;
private int placement = CENTER ;
public int getPlacement() { return placement ; }
public void setPlacement( int placement ) {
if( ( placement < CENTER ) || ( placement > STRETCH ) ) {
throw new IllegalArgumentException( "Unsupported placement value" ) ;
this.placement = placement ;
public void paint( Graphics gr ) {
// x of Image to draw
int x ;
// y of Image to draw
int y ;
// width of Image to draw
int iw ;
// height of Image to draw
int ih ;
// thickness of left border
int bl = 0 ;
// thickness of upper border
int bt = 0 ;
// thickness of right border
int br = 0 ;
// thickness of lower border
int bb = 0 ;
// width of drawable area
int pw = this.getWidth() ;
// height of drawable area
int ph = this.getHeight() ;
// Handle borders
Insets insets = null ;
Border border = getBorder() ;
if( border != null ) {
insets = getBorder().getBorderInsets( this ) ;
if( insets != null ) {
bl = insets.left ;
br = insets.right ;
bb = insets.bottom ;
bt = insets.top ;
pw = pw - bl - br ;
ph = ph - bt - bb ;
// Always display background, for supporting transparency.
super.paint( gr ) ;
if( image != null ) {
iw = image.getWidth( imageObserver ) ;
ih = image.getHeight( imageObserver ) ;
if( ( placement == STRETCH ) ||
( iw > pw ) ||
( ih > ph )
gr.drawImage(image, bl, bt, pw, ph, imageObserver ) ;
} else {
iw = image.getWidth( imageObserver ) ;
ih = image.getHeight( imageObserver ) ;
switch( placement ) {
case CENTER :
x = ( pw - iw ) / 2 ;
y = ( ph - ih ) / 2 ;
break ;
case NORTH :
x = ( pw - iw ) / 2 ;
y = 0 ;
break ;
case NORTHEAST :
x = pw - iw ;
y = 0 ;
break ;
case EAST :
x = pw - iw ;
y = (ph - ih ) / 2 ;
break ;
case SOUTHEAST :
x = pw - iw ;
y = ph - ih ;
break ;
case SOUTH :
x = ( pw - iw ) / 2 ;
y = ph - ih ;
break ;
case SOUTHWEST :
x = 0 ;
y = ph - ih ;
break ;
case WEST :
x = 0 ;
y = ( ph - ih ) / 2 ;
break ;
case NORTHWEST :
x = 0 ;
y = 0 ;
break ;
default :
throw new IllegalArgumentException(
"Unsupported placement value" ) ;
// Add border offset
x += bl ;
y += bt ;
gr.drawImage( image, x, y, this ) ;
public final static int CENTER = 0 ;
public final static int NORTH = 1 ;
public final static int NORTHEAST = 2 ;
public final static int EAST = 3 ;
public final static int SOUTHEAST = 4 ;
public final static int SOUTH = 5 ;
public final static int SOUTHWEST = 6 ;
public final static int WEST = 7 ;
public final static int NORTHWEST = 8 ;
public final static int STRETCH = 9 ;