[Interest] Calculate FPS with QGLWidget - paintGL() is not called

[Till Oliver Knoll]

Am 10.02.2012 um 08:56 schrieb Dietrich.Gossen at continental-corporation.com:

> Hi, 
> 
> I am trying to calculate the fps of my application. I know in general how to do it, but my implemented QGLWidget doesn’t work properly. The paintGL() Method doesn’t get called. 
> ...
> And that’s my main.cpp 
> 
>     int main(int argc, char *argv[]) 
>     { 
>         QApplication a(argc, argv); 
>       
>         QGraphicsScene scene
>       
>       
>         QGraphicsView view(&scene); 
>       
>         GLWidget *gl = new GLWidget(); 
>       
>         view.setViewport(gl); 
>         view.setViewportUpdateMode(QGraphicsView::FullViewportUpdate); 
>       
>         view.show(); 
>         
>         return a.exec(); 
>     } 

Is this your actual code? Because you don't add any items to your scene, so there is nothing to paint!

So I guess Qt just clears the background, but doesn't bother calling the QGLWidget's paint method.

Cheers, Oliver
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