[Qt-interest] How enforce aspect ratio of QGLWidget in QLayout?

[Ed Sutton]

On Sep 10, 2010, at 12:24 PM, Jason H wrote:

> Qxt's QxtLetterBox widget (container for any QWidget)

Wow, that was easy!

Thank you for turning me on to Qxt !!!

-Ed

> 
> 
> 
> 
> ----- Original Message ----
> From: Ed Sutton <ESutton at fescorp.com>
> To: Qt-interest Interest <qt-interest at trolltech.com>
> Sent: Fri, September 10, 2010 9:24:43 AM
> Subject: [Qt-interest] How enforce aspect ratio of QGLWidget in QLayout?
> 
> When main window is resized, I want to enforce the aspect ratio of video 
> displayed in a QGLWidget.  My first attempt implemented this in 
> GLWidget::resizeGL() by adjusting the glViewport width and height.  This sort of 
> worked but left black bars at either the top or side and when I changed channels 
> to a new aspect ration video, it would not fix itself because no resize called.
> 
> I think the correct approach must be to control the size of the GLWidget rather 
> than the glViewport.  Do I need to implement this is the BorderLayout that the 
> GLWidget was added to?
> 
> Thanks in advance for any tips or direction,
> 
> -Ed
> 
> /// Widget to handle reception of video and render as a OpenGl 2-D texture
> class GLWidget : public QGLWidget
> {
> protected:
>   // storage for one texture - the video frame bitmap
>   GLuint m_texture[1];
>   int m_width;
>   int m_height;
>   void initializeGL();
>   void paintGL();
>   void resizeGL(int width, int height);
> };
> 
> 
> // Border layout contains a channel selector to the right of the video window
> class BorderLayout : public QLayout
> {
> };
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> 


-Ed