How do I store the current image of my JPanel?

Question

I wanted to store the current look of my JPanel in order to re-use it as the background for the next iterations of my game loop. I've tried several things that were mentionned on the Internet, but I wanted to do it in a very simple way. I'm currently using this to story the current Image of the JPanel:

if(needImage){
                Graphics g = tmp.getGraphics();
                g = getGraphics();
                needImage = false;
            }

and this to draw it:

 g.drawImage(tmp, 0, 0, this.getWidth(), this.getHeight(), null);

Any ideas ?

Edit:

I tried this method, found at Can I create a BufferedImage from a JPanel...:

   private BufferedImage getScreenShot(JPanel panel){
        BufferedImage bi = new BufferedImage(
            panel.getWidth(), panel.getHeight(), BufferedImage.TYPE_INT_ARGB);
        panel.paint(bi.getGraphics());
        return bi;
    }

But it doesn't work right. I'm drawing 1 pixel large rectangles in a loop, in order to draw lines when using the move keys, but it seems to only capture the last point with this method.

g.setColor(new Color(hexaR, hexaV, hexaB));
g.fillRect(x, y, 1, 1);

I've taken some screenshots to show you the result: Original:

Original Image

Image after some modification

As you can see, the original image as been deleted, but it remains the final dots of the "cursor" (x and y inputs of the keyboard). Basically, what I want it to do is to stop the drawing of the lines when I press space, but I want to be able to look where the dots I'm moving are.

I don't know if it clear or not, please tell me. I'll try my best to provide clearer explanations.

Why do you think `getGraphics` gives you the current image of the JPanel? `Graphics` is a drawing environment, not an image. — RealSkeptic, Nov 18 '15 at 19:54
Create a BufferedImage, use its Graphics content to "print" the component — MadProgrammer, Nov 18 '15 at 19:55
For better help sooner, post a [MCVE] or [Short, Self Contained, Correct Example](http://www.sscce.org/). — Andrew Thompson, Nov 19 '15 at 02:02
As an aside, if there is a common BG to different frames of a game, I would draw the BG to a `BufferedImage`, and draw the image to the panel for each frame of the game animation. I feel the code seen here is taking the wrong approach to achieve the stated goal. — Andrew Thompson, Nov 19 '15 at 02:04
@ManojKumar Now that's a classy edit. I was hoping you'd have the good sense to embed the images when doing the edit. :) — Andrew Thompson, Nov 19 '15 at 04:19
@AndrewThompson Drawing the BG to a BufferedImage and painting it for each frame is exactly what I want to do. But rather than the expected result, my image gets reset and the only thing that's printed is the last point drawn. — Noxilex, Nov 19 '15 at 10:01
*"But rather than the expected result,.."* Time to take this up to the next level, with my most common 'copy/paste comment'... ;) For better help sooner, post a [MCVE] or [Short, Self Contained, Correct Example](http://www.sscce.org/). Provide a complete (short) example that will run and display the problem, and I'm sure the solution will become clear to someone that happens by the question. — Andrew Thompson, Nov 19 '15 at 11:05

How do I store the current image of my JPanel?

0 Answers0