[Qt4-preview-feedback] Zooming with a rubber band

[sergio cavalcante]

People,

I have a widget with a QGraphicsView where I load an image using these
comands:

QGraphicsScene* scene = new QGraphicsScene;
scene->addPixmap(QPixmap(strPath));

ui.graphicsView_2->setScene(scene);
ui.graphicsView_2->setInteractive(true);

I need to make a zoom tool which, using a ruber band, I could zoom the
selected area.
so I set the QGraphicsView this way:
ui.graphicsView_2->setDragMode(QGraphicsView::RubberBandDrag);

And the band appears automatically, whithout subclassing the GraphicsView
and handling mouse events.

So I Googled a lot, and I've found a way to zoom the rubber band selected
area:

QPolygonF selectionPoly = mapToScene(selectionRect);
fitInView(QRectF(selectionPoly.boundingRect());

It really works? If yes, where do I need to put this code to work correctly?

Thanks for any help!

Best Regards,
------------------------------
Sérgio Cavalcante
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