Apply Image as background to JPanel [RESOLVED]

How can I apply an image as a background to a JPanel? I can do this fine with the graphic object, but it's drawing is temporary... so I thought of getting to do a new class extending JPanel...

what I got so far is this:

Code:

---

package rukupaint;
import javax.swing.*;
import java.awt.*;
import java.util.*;

public class clsPaintPanel extends JPanel {
   
    /** Creates a new instance of clsPaintPanel */
    public clsPaintPanel() {
    }

    protected void paintComponent (Graphics g) {
        super.paintComponent (g);

        if (this.image != null) {
            Graphics2D g2d = (Graphics2D) g;
            int iw = this.image.getWidth(this);
            int ih = this.image.getHeight(this);
            int w = iw != 0 ? iw : 1;
            int h = ih != 0 ? ih : 1;
            double sx = ((double) getWidth()) / ((double) w);
            double sy = ((double) getHeight()) / ((double) h);
            AffineTransform at = new AffineTransform ();

            if (this.maintainAspectRatio) {
                sx = sy = Math.max(sx, sy);
            }
           
            at.scale(sx, sy);
            g2d.drawImage(this.image, at, this);
        }
    }
}

---

I've seen this on another forum, I do not claim the code to be mine, I just need to understand how to logically solve my problem...

But there doesn't seem to be an "image" property to the JPanel...

help on this would be appreciated!!! :)

(By the way if there is some object I havn't seen that runs a background picture property, don't hesitate sharing the class/object, thx!!!)

you should add

Code:

---

private Image image;
    private boolean maintainAspectRatio;

---

Quote:

---

Originally Posted by Ruku

How can I apply an image as a background to a JPanel? I can do this fine with the graphic object, but it's drawing is temporary... so I thought of getting to do a new class extending JPanel...

what I got so far is this:

Code:

---

package rukupaint;
import javax.swing.*;
import java.awt.*;
import java.util.*;

public class clsPaintPanel extends JPanel {
   
    /** Creates a new instance of clsPaintPanel */
    public clsPaintPanel() {
    }

    protected void paintComponent (Graphics g) {
        super.paintComponent (g);

        if (this.image != null) {
            Graphics2D g2d = (Graphics2D) g;
            int iw = this.image.getWidth(this);
            int ih = this.image.getHeight(this);
            int w = iw != 0 ? iw : 1;
            int h = ih != 0 ? ih : 1;
            double sx = ((double) getWidth()) / ((double) w);
            double sy = ((double) getHeight()) / ((double) h);
            AffineTransform at = new AffineTransform ();

            if (this.maintainAspectRatio) {
                sx = sy = Math.max(sx, sy);
            }
           
            at.scale(sx, sy);
            g2d.drawImage(this.image, at, this);
        }
    }
}

---

I've seen this on another forum, I do not claim the code to be mine, I just need to understand how to logically solve my problem...

But there doesn't seem to be an "image" property to the JPanel...

help on this would be appreciated!!! :)

(By the way if there is some object I havn't seen that runs a background picture property, don't hesitate sharing the class/object, thx!!!)

---

You paint the image... Simply add this class and use it in your other class.

Still can't solve this, sorry if I've been unclear... What I want is just to draw an image that sticks to the object... such as .net's picturebox...

since there is no picturebox in Java I thought of using a jPanel, but when I move a window over what I've drawned the image disapears!

So how can I do this sticky image thing? :ehh:

:wave:


To ComputerJy: My class is working, yeah I forgot some declarations in the code i've pasted...!!

To System_Error: I did, but what happens is that all my image gets white and nothing is drawned... o_O

I found this link. it might be usefull

thx for the link... but I don't understand what exacly makes the image sticky within the paintComponent(Graphics g) sub.... o_O

(Graphics2D g2d = (Graphics2D) g;)

looks like the 2 most important lines are:

super.paintComponent(g);
g2d.drawImage(this.image, at, this);

buuut it doesn't quite work... nothing gets drawned... :ehh:

Did you change the file name?

uh, no, what filename? :ehh:

I got my class with the constructor working well... :confused:

the only thing I didn't get is that ImageFill class within the link you gave me... can't find it... and I've imported everythin' they did...

In their code, the image is captured from a file "background.jpg" in the constructor, make sure you change that file to a valid image file.

Code:

---

    protected void paintComponent(Graphics g) {
        try {
            super.paintComponent(g);
            g.drawImage(image, 0, 0, this);
        }
        catch (Exception ex) {
        }
    }

---

got everything working...!

I just needed to call the repaint(); method and everything was good!!! :rolleyes:


:wave: