Can I render a JPanel to a BufferedImage?

Question

I'm doing some unusual things with laying out components, and would like to be able to render the content of a JPanel directly to a BufferedImage.
I woudl like to
- create a BufferedImage to use as a back buffer
- define a Dimension for my JPanel component and cause it to layout itself to this dimension
- create a graphics on my BufferedImage
- apply an arbitrary AffineTransform to my Graphics2D
- render my JPanel with the Graphics2D
Is there a way to do this? I've been scratching my brain, but can't thin o fhow to render outside of AWT..
Mark McKay
http://www.kitfox.com

Answer 1

No need to subclass anything:
JSplitPane sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
            new JTree(), new JScrollPane(new JTable(20, 5)));
JPanel p = new JPanel(new GridLayout(1,1));
p.add(sp);
p.setBorder(BorderFactory.createTitledBorder("This is a test:"));
JFrame f = new JFrame("App");
f.getContentPane().add(p);
f.pack();
BufferedImage image = new BufferedImage(p.getWidth(), p.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
p.paint(g);
g.dispose();
ImageIO.write(image, "jpeg", new File("test.jpeg"));