Hi all, I tested the removing graphic items on PyQt4 and C++ Qt4. It works correctly. The time for the removing items not increases exponentially. I think, PySide contains a bug with the garbage collection or something similar.
> Hi everyone, > > My program should work with a great number of graphic items in the > graphic scene QGraphicsScene. There are hundred thousand homogeneous > items similar to QGraphicsRectItem. The items can be removed or added at > the runtime. All the items sometimes are removed from the scene. > > I have noticed that if I want to remove all the items from the scene > using “clear” method or in the loop using “removeItem” method (“clear” > works much longer), I have to wait for a long time the operation > completing, if the cleaning is used not for the first time. In this > case, the item removing, unlike the element adding that is always the > same, is extremely slow. Such a situation occurs when there are more > than several thousand items (more than 10 000). The time for the > removing items increases exponentially (see the pictures with the > attached plots). Also I have written a simple test example (please, find > the attached example), demonstrating this problem. > > At present I use PySide, version 1.2.1 (Qt 4.8.5) and Python 2.7.6 > x86/x64 on OS Windows 7 x64. > > CPU: Intel Core 2 Quad 6600 > RAM: 6 Gb > > -- > Best regards, > Evgeny -- Best regards, Evgeny _______________________________________________ PySide mailing list PySide@qt-project.org http://lists.qt-project.org/mailman/listinfo/pyside
