QGraphicsView keep aspect ratio of items when scaled

[^NyAw^]

Hi,

I'm trying to use QGraphicsView and QGraphicsScene to do represent a plastic film that is 0.3meter width and 100meter height. In this plastic film there are some marks that I want to show to the user. The problem is that the aspect ratio of the film. Using the "fitInView" method keeping the aspect ratio gets me a view like you can see on the attached image.
keepAspectRatio.PNG
The black line is the rectangle that represents the full scene.

Without keeping the aspect ratio I get what I want but with the problem that the items also don't keep their aspect ratio, so a circle is displayed as an ellipse.

What I need is to show the full scene into the view(sure that will not keep the aspect ratio) but show the items with the original aspect ratio.

Thanks,

P.D.: I don't want the scroll bars to be used. This is why I want to show the full scene fitting the view.

Maybe the use of Qwt will be simple as I only want to let the user to pick the marks to show more information.

[wysota]

One thing is that you can always hide scrollbars if you don't want them. Another thing is that you can pass KeepAspectRatioByExpanding to fitInView.

[^NyAw^]

Hi,

What i need is to full fit the scene into the view but also need to display the items keeping the original aspect ratio. This is, when I add a square rectangle I want it to be displayed square or if I add a circle I want it to be showed as a circle, not an ellipse.

Passing KeepAspectRatioByExpanding the scene will get out of the view limits(as I understand).

Thanks,

[wysota]

I think your requirements are contradictory. You want to display something that doesn't fit your display in a way that it fits your display but without reducing the size in the other dimension at the same time keeping the aspect ratio. This is simply not possible. Either the larger dimension will not fit into the view, the smaller dimension will have to be scaled down or the aspect ration will have to be ignored.