[Qt-interest] QGraphicsScene problem

[Patric]

Apparently QGraphicsItem is calling the timer. Maybe moveBy() works with timer I don't know. 
But moveBy() is called from my second thread, and the scene object is located in the main thread. 
  ----- Original Message ----- 
  From: Scott Aron Bloom 
  To: qt-interest at trolltech.com 
  Sent: Saturday, August 29, 2009 11:44 AM
  Subject: Re: [Qt-interest] QGraphicsScene problem


  Put a breakpoint in QObject at the warning message.  Then see who is calling the timer.

  Somewhere in your code there is a timer kicking off

   

  Scott

   

  From: Patric [mailto:userqt at gmail.com] 
  Sent: Saturday, August 29, 2009 1:40 AM
  To: Scott Aron Bloom; qt-interest at trolltech.com
  Subject: Re: [Qt-interest] QGraphicsScene problem

   

  I don't have any timers. 

  But I have found that when the item's moveBy() functions is called, the warning is given. 

   

  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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