Is there a way to convert a JPanel (that has not yet been displayed) to a BufferedImage?
thanks,
Jeff
+4
A:
From the BufferedImage you can create a graphics object, which you can use to call paint on the JPanel, something like:
public BufferedImage createImage(JPanel panel) {
int w = panel.getWidth();
int h = panel.getHeight();
BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bi.createGraphics();
panel.paint(g);
return bi;
}
You may need to make sure you set the size of the panel first.
Tom
2009-08-28 20:46:06
nice, thanks. is there a way i can figure out what the panel size should be (maybe its preferred size)?
Jeff Storey
2009-08-28 20:49:26
I believe it's preferred size, or current size, as long as it has been rendered already. There are problems if it has not been rendered already - I cannot remember the exact specifics, but I remember running into similar properties when implementing a printing system.
aperkins
2009-08-28 20:59:46
Yep, the preferred size works, but as you said, it doesn't render if the panel isn't displayed yet, which doesn't really help me too much. Is there a way to "render" it but not display it on the screen? Basically I'm building a component that needs to get written to an image but not displayed.
Jeff Storey
2009-08-28 21:09:12
If you use panel.printAll(g) then it should work.
Russ Hayward
2009-08-28 22:15:32
Hmm..that printAll still doesn't work if the component hasn't been made visible yet.
Jeff Storey
2009-08-28 22:40:53
A:
Basically I'm building a component that needs to get written to an image but not displayed
ScreenImage explains how to do what you want.
camickr
2009-08-28 21:28:58
A:
Take a look at BasicTableUI. The cell renderer is drawn on image without showing and then drawn on visible table component.
Rastislav Komara
2009-08-29 06:31:21