How can I make size of QGraphicsScene smaller?

[aamer4yu]

Hey wysota,,,, he cud also use QGraphicsScene::itemsBoundingRect instead of calculating the united on boiunding rects himself , isnt it ???

[wysota]

Yes, of course. It could be a bit slower though, but unless there are many many items in the scene, it shouldn't matter.

[troorl_ua]

Thanks, It's works =)
I used

scene->setSceneRect(0, 0, scene->itemsBoundingRect().width() + offset, scene->itemsBoundingRect().height() + offset);

scene->setSceneRect(0, 0, scene->itemsBoundingRect().width() + offset, scene->itemsBoundingRect().height() + offset);

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It's slow, but I don't know other way

[wysota]

As I mentioned before, cache the result from a previous call and update it when an item is moved (based on the move itself).

[Bitto]

Prefer this:

scene->setSceneRect(scene->itemsBoundingRect());

scene->setSceneRect(scene->itemsBoundingRect());

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The itemsBoundingRect() function finds the actual bounding rect, and that might not be at (0, 0). If you force the scene rect to be (0, 0, width, height), you're bound to have items outside the scene.