Redraw only selected items in QgraphicsScene.

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Graphics view automatically only redraws those items which have been modified. You can tweak the exact behaviour using update modes and item caching.

thanks for reply, wysota.
You're right, i know Qtgui say like you too. But if you have got 2 QgraphicsItems, and their bounding rect is the same, when you call update function to redraw the first item, second item will be redrawn too. I have tested it, and this is my problem.
Sorry for my bad english.
Thanks.