Movable QGraphicsItem not rendering properly

[RUH27]

Hello, I copied one of the codes in this tutorial: https://www.pythonguis.com/tutorials/pyqt-qgraphics-vector-graphics/, the one where setting flag that makes item movable. When I run the code and move with the circle it renders too slow, however, when I take a printscreen, everything looks right (not as in the photo bellow). In NVIDIA control panels I tried to change the setup of vertical synchronisation but with no success. Thanks for advice.

[RUH27]

Luckily, ChatGPT has an answer: just this line

view.setViewportUpdateMode(QGraphicsView.ViewportUpdateMode.FullViewportUpdate) # Update the full viewport

[mfitzp]

Glad you found a solution @RUH27 although that's not really a "fix", in that it has performance impacts for most normal uses. You normally only want to turn that on when you have many thousands of small objects in the view.

Can you let me know which version of Qt/PySide/PyQt you're using? I suspect this is a bug in the version, would be good to test & isolate it.