QGraphicsView coordinate system

[edxxgardo]

Hello everybody,

I am dealing with a simple application using a main window with menu bar and tool bar. After that, I set as main widget a QGraphicsView and inside it a QGraphicsScene. What I do is basically design inside QGraphicsScene and it works. But, my problem is that I don't get the size of the View and Scene.
1) I do
scene->setSceneRect(0,0,view->width(), view->height())
to set the scene as big as the view size, that in my case, because I used the showFullScreen() method in the main window, is 640x480. Doing so, I get the scene in the center of the window and the size is a quarter of the main window. Why the scene is not the full size of the view?

2) If I set, for example,
scene->setSceneRect(0,0,view->width()+200, view->height()+200)
then it is bigger as I would want.

My question is how can I do to get the scene the size of the View and why the view->width() does not work as parameter above. I would really appreciate any help, thx

[mcosta]

where you used

scene->setSceneRect(0,0,view->width(), view->height())

scene->setSceneRect(0,0,view->width(), view->height())

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?

you should do in resizeEvent

[d_stranz]

Can also use QGraphicsView::fitInView() with Qt::KeepAspectRatio in the resize event if you don't want distortion due to changes in the width / height ratio on resizing. That also will center the scene in the view.

Note that calling setSceneRect() will change *all* views of the scene, not just the one with focus. So if you have the same scene displayed in more than one window, you want the method I described (which changes only the scaling used by the view, not the scene dimensions), otherwise the scene will look fine in one view, but not in any of the others.

[edxxgardo]

Thx a lot guys, I try it out and see if it works.