[Qt-interest] QGraphicsScene problem

[Sean Harmer]

Hi,

On Saturday 29 Aug 2009 09:40:14 Patric wrote:
> I don't have any timers.
> But I have found that when the item's moveBy() functions is called, the
> warning is given.
What thread does your scene and items have affinity with? Main or worker?

Personally I would just get your worker thread to emit signals that tell the 
items where to move to rather than having the worker thread move the items 
directly which is what it sounds like you are doing form the limited 
information.

This keeps your game logic code in the worker thread but keeps the GUI stuff 
in the main thread where it has to live.

Can you post some example code that reproduces the problem?

Have you tried doing this without using threads?

Sean

>
> The scene is in the main thread, the worker thread possesses a pointer to
> the scene. And the worker thread is trying to move the item's in the scene
> around. ----- Original Message -----
>   From: Scott Aron Bloom
>   To: qt-interest at trolltech.com
>   Sent: Saturday, August 29, 2009 11:21 AM
>   Subject: Re: [Qt-interest] QGraphicsScene problem
>
>
>   The timer is owned/constructed in one theread, and is being
> started/stoped by the worker thread.
>
>
>
>   Try calling moveToThread to move the timers into the worker thread.
>
>
>
>   Scott
>
>
>
>   From: qt-interest-bounces at trolltech.com
> [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Patric Sent:
> Saturday, August 29, 2009 1:11 AM
>   To: qt-interest at trolltech.com
>   Subject: [Qt-interest] QGraphicsScene problem
>
>
>
>   Hello guys,
>
>   I have QGraphicsScene here with items on it.
>
>
>
>   I have manual control (i.e. keyboard events) and also auto control
> (through a thread which makes all the calculations where these QPixmapItems
> should interact).
>
>
>
>   When I control them, everything is OK.
>
>   But when I start the auto control, i.e. my thread which simulates the
> actions, I'm observing a very strange behaviour. It's a game actually, it's
> turn based.
>
>   So somethimes the objects on the board are just not moving on their
> turns.
>
>
>
>   I have implemented this simulation engine with the technique used in the
> Mandelbrot example.
>
>
>
>   In my MainWindow class I have instance of the engine thread, and when
> some button in the GUI is pressed MainWindow calls a method in the thread
> (directly), which wakes the thread.
>
>   And I'm getting this shit :
>
>
>
>   QObject::killTimer: timers cannot be stopped from another thread
>
>   QObject::startTimer: timers cannot be started from another thread
>
>   QObject::killTimer: timers cannot be stopped from another thread
>
>   QObject::startTimer: timers cannot be started from another thread
>
>   QObject::killTimer: timers cannot be stopped from another thread
>
>   QObject::startTimer: timers cannot be started from another thread
>
>
>
>   Any ideas why ?
>
>
>
>   Regards,
>
>   Patric
>
>
>
>   p.s.:in the end of the thread's run method there is sleep call also.
>
>
>
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>
>
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