[Qt-interest] Saving image rendered in openGL widget in different resolutions

[anjani gupta]

Hi,

I tried using QGLWidget::renderPixmap( ), but I am getting black image, it does not display rendered widgets.

Code snippet:
 <code>
 QGLWidget* main_window;
 //Assign value to main_window
 ...
 main_window->raise();
 main_window->repaint();
 QPixmap image = main_window->renderPixmap(800,600);
 image.save("filename","JPG"));
 </code>

This saves an empty black image in 'filename.jpg'
Thanks in advance!

Regards,
Anjani


--- On Fri, 2/13/09, Fabio Dago <fabio.dago at sir.to.it> wrote:
From: Fabio Dago <fabio.dago at sir.to.it>
Subject: Re: [Qt-interest] Saving image rendered in openGL widget in different resolutions
To: anjanigupta_dce at yahoo.com, qt-interest at trolltech.com
Date: Friday, February 13, 2009, 9:02 PM

You can use this:

QPixmap QGLWidget::renderPixmap <qglwidget.html#renderPixmap> ( int w =
0, int h = 0, bool useContext = false )

Regards.

Fabio

anjani gupta ha scritto:
> Hi,
>  I want to save openGL image rendered on main window in different file
formats with different resolutions.
> To save image in different format, I am using the following code:
>  <code>
> QGLWidget* main_window;
> //Assign value to main_window
> ...
> main_window->raise();
> main_window->repaint();
> QPixmap image = QPixmap::grabWindow(main_window->winId());
> image.save("filename","TIF"));
> </code>
>  I want to save image in different resolutions.Is there some efficient way
to save image in different resolutions?
>  Thanks in advance!
>  Regards,
> Anjani
> 
> 
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