Background image in JPanel

[miguel lisboa]

I'm using eclipse 3, and at a given point i've this code - that was suposed to display a background image (yes the jpg does exist at given path):

    private JPanel getJPanelCv() {
    
        if (jPanelCv == null) {
            
...
            
            jLabelNomeCv.setText("Nome da Conven��o");
 
...
 
            jPanelCv = new JPanel() {
 
            public void paintComponent(Graphics g) {
 
                super.paintComponent(g);
/*                
                Color amarelo = new Color(255,255,210);
                
                Color azul = new Color(225,245,255);
                
                Graphics2D g2d = (Graphics2D) g;
                
                GradientPaint gradiente = new GradientPaint (0, 0, azul, 600, 600, amarelo);
                
                g2d.setPaint(gradiente);
                
                g2d.fillRect(0,0, 846, 491);*/
                
                Image imagem = new ImageIcon("img/mar.jpg").getImage();
 
                g.drawImage(imagem, 0, 0, this);
                     
            }
            
        };
            
...    
        
        }
        
        return jPanelCv;
        
    }    

if i use the gradient everything goes fine, but when i chose to use the jpg it does not show up
What am i doing wrong?

TiA

[Michael Dunn]

worked OK for me, but changed to a .gif file in local folder

[miguel lisboa]

thanks, Michael!

so error must be in image path: i created a folder called img that lies inside bin directory: is that correct?

(i confess i tried every single possible location for my jpg and also tried with gif

TiA

[Michael Dunn]

> new ImageIcon("img/mar.jpg").getImage();

java will be looking to find mar.jpg in folder img which is a subfolder
of the current folder

[miguel lisboa]

by current folder you mean bin (classes) or src?

[Michael Dunn]

the folder you are running your program from

eg
your current java file is ImageBackground.java
and it is in the folder
c:\Documents and Settings\ML\Java\ImageBackground

java will look for mar.jpg in
c:\Documents and settings\ML\Java\ImageBackground\img

it may also look in bin, ext, and classpath folders,
but I'm not 100% sure about that - someone else may
be able to confirm.

[miguel lisboa]

thank you again, Michael!

i'm really puzzled with this
as i said earlier, i tried copy/paste my img folder into every reasonable location

[Michael Dunn]

here's the full program I'm working with.

the image shows up both with and without the gradient code.
the image also shows up, as above, when the .gif file
is in the same folder, or in a subfolder

    
import javax.swing.*;
import java.awt.*;
 
class Testing extends JFrame
{
  public Testing()
  {
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(200,200);
    setLocation(200,100);
    JPanel panel = new JPanel(){
      public void paintComponent(Graphics g) {
        super.paintComponent(g);
     /*   Color amarelo = new Color(255,255,210);
        Color azul = new Color(225,245,255);
        Graphics2D g2d = (Graphics2D) g;
        GradientPaint gradiente = new GradientPaint (0, 0, azul, 600, 600, amarelo);
        g2d.setPaint(gradiente);
        g2d.fillRect(0,0, 846, 491);*/
        Image imagem = new ImageIcon("images/test.gif").getImage();
        g.drawImage(imagem, 0, 0, this);}};
    getContentPane().add(panel);
  }
 public static void main(String[] args){new Testing().setVisible(true);}
}

[miguel lisboa]

thanks again for your continuous interest, Michael!

i got the solution from here

as to path, i have my gui code inside bin, in package called gui; inside bin, too, i have a folder called img (with my images): this explains my new path

here's my (working) code:

            jPanelCv = new JPanel() {
 
            public void paintComponent(Graphics g) {
 
               super.paintComponent(g);
                
                Color amarelo = new Color(255,255,210);
                
                Color azul = new Color(225,245,255);
                
                Graphics2D g2d = (Graphics2D) g;
                
                GradientPaint gradiente = new GradientPaint (0, 0, azul, 600, 600, amarelo);
                
                g2d.setPaint(gradiente);
                
                g2d.fillRect(0,0, 846, 491);
                
              //  Image imagem = new ImageIcon("a.jpg").getImage();
                
                Image imagem = null;
                
                try {
                    
                    imagem = ImageIO.read(new java.net.URL(getClass()
                                        
                        .getResource("../img/mar.jpg"), "../img/mar.jpg"));
                
                }
                
                catch(Exception e){
                    
                    System.out.println("n�o h� fundo");
                    
                }
 
                g.drawImage(imagem, 0, 0, this);
                     
            }
            
        };    

this code:

                    Image imagem = new ImageIcon("../img/a.jpg").getImage();    

doesnt work (but dont ask me why)