Qt-interest Archive, September 2007
Re: How to use widget rendering in QThread?
Message 1 in thread
> 2) in a separate thread, render a scene into a QImage, and when the
> thread is done, post the QImage to the widget to use
Brad,
Let you know that the problem got solved by following your 2nd suggestion.
In the processing of a second thread, a signal is emitted, which is
connected to a slot in the GUI thread by Qt::BlockingQueuedConnection.
This type of connection is new, which was introduced in Qt 4.3.0.
Here is the application using communication between threads:
http://hopf.chem.brandeis.edu/yanglingfa/Qt/OOXML/directImg/#thread
Thank you very much,
Lingfa
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Message 2 in thread
> My approach has been to do one of two things:
>
> 1) throttle updates by using a timer or timestamp so that updates
> only happen as fast as a certain FPS threshold
> 2) in a separate thread, render a scene into a QImage, and when the
> thread is done, post the QImage to the widget to use
>
Brad,
Let you know that the problem got solved by following your 2nd suggestion.
In the processing of a second thread, a signal is emitted, which is
connected to a slot in the GUI thread by Qt::BlockingQueuedConnection.
This type of connection is new, which was introduced in Qt 4.3.0.
Thank you very much,
Lingfa
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