QGraphicsView performance problem

[yuazhen]

Hi Forums,
There are a lot of items in the QGraphicsScene has been set to a QGraphicsView which uses a QGLWidget as the viewport. When update one of item in the scene, it will takes a lot of time to re-paint all of items in the scene even their contents are staying un-changed. It can lower down the framerate. How can I get the higher performance with this kind of scene? Can anybody help me?

[rokemoon]

You can have a look this presentation from DevDays 2010 about Graphics Framework.
Here they are: "1":http://developer.qt.nokia.com/videos/watch/performance_do_graphics_the_right_way "2":http://developer.qt.nokia.com/videos/watch/qt_graphicsview_in_depth
In this presentation says about some tip and tricks of graphics view framework.

[yuazhen]

[quote author="rokemoon" date="1320830557"]You can have a look this presentation from DevDays 2010 about Graphics Framework.
Here they are: "1":http://developer.qt.nokia.com/videos/watch/performance_do_graphics_the_right_way "2":http://developer.qt.nokia.com/videos/watch/qt_graphicsview_in_depth
In this presentation says about some tip and tricks of graphics view framework.[/quote]
Thanks for your advice.

[rokemoon]

Always welcome.