RubberBand zoom implementation for images

[cdemirkir]

Hi everyone
I'd like to implement a RubberBand zoom for an image viewer. I'd be grateful to anyone who lead me to the design information or an implementation of such a zoom function.

Sincerely
Cem

[jpn]

Take image viewer example (http://doc.trolltech.com/4.3/widgets-imageviewer.html) as a playground. See QRubberBand example usage in its docs. All what is left is to calculate a suitable scale factor and scroll bar values in mouseReleaseEvent(). :)

[Bitto]

Or use QGraphicsView - it's got a nifty function called QGraphicsView::fitInView() that many people use to implement rubberband zooming.

[aamer4yu]

Ya Bitto is right... but dont forget to convert the view cordinates to scene cordinates as fitInView() takes scene cordinates.

[ber_44]

This subject is also running in another thread:
http://www.qtcentre.org/forum/f-qt-programming-2/t-draw-rubberband-line-3596.html