Question

I’m missing the export file code, but I have no clue as to what I need to add. I have a drawn image in a JPanel -> panel and want to save that image into my desktop. What do I need to add?

JFileChooser chooser = new JFileChooser();
chooser.showOpenDialog(panel);

I’ve added the following code to my paintComponent method:

bi = new BufferedImage(panel.getSize().width,panel.getSize().height,
          BufferedImage.TYPE_INT_ARGB);
g = bi.createGraphics();

And then the Save Button does this… What else am I missing? Or doing incorrectly more so.

JFileChooser chooser = new JFileChooser();
chooser.showSaveDialog(panel);

try{ImageIO.write(bi,"png",new File("test.png"));}catch (Exception ex) {}

Answer 1

You’re question is missing some important information: how are you drawing things on the JPanel? In my opinion, the smart way would be to draw into a BufferedImage, and then simply save the BufferedImage to file using ImageIO.write(...)

Edit
You state:

I’m just drawing polygons onto a class that extends JPanel. I create them via the paintComponent method.

Again, I recommend that you draw them to a BufferedImage, by getting its Graphics context, drawing to the image using this Graphics object, and then disposing the Graphics object. You would display the BufferedImage in your JPanel’s paintComponent(...) method by calling g.drawImage(...). Then if you want to save the drawing, again, simply save the BufferedImage.