[Qt-interest] QGraphicsView QThread

[Fred Duarte]

I have not tried this approach(Graphics update with QThreads), but seems a
cool solution. Do you have this code published anywhere?

And for the problem you're having, it may require a more detailed
thread safety mechanism. Not just a mutex in the update() method.

-- 
Frederico Duarte

On Mon, Mar 30, 2009 at 12:03 PM, Bas Terwijn <B.Terwijn at uva.nl> wrote:

>
> hi all,
>
> I am trying for some time to use QGraphicsView in a multi-threaded
> application where in the main thread I create an QGraphicsView object
> and run the event loop while in a seperate QThread I create and and
> change many QGraphicsItems that are to be visualized in the main thread.
> For thread safety I use a mutex to synchronize the (overloaded)
> QGraphicsView::update() method and all changes to the QGraphicsItems.
>
> My approach doesn't work. I find that the QGraphicsView doesn't update,
> even when I send signals which I think should start the
> QGraphicsView::updateScene() from the main thread. I also experience
> core dumps.
>
> Did anybody find a way to use QGraphicsView to visualize QGraphicsItems
> that are changed by a seperate QThread?
>
> Thank you for your time,
> Bas Terwijn
>
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