[Qt-interest] adding a magnifying glass effect to QGraphicsView

[Andy Brice]

I want to add a magnifying glass effect to a QGraphicsView, similar to this:
http://labs.trolltech.com/blogs/2009/10/07/magnifying-glass/

It seems I can use a similar approach, using QGraphicsScene::render() to 
draw a x2 scaled pixmap into a msak on top of the QGraphicsView. Is that 
the best approach, or is there a simpler/better one?

I note the 'deform' example uses a different approach via QPainterPath. 
Would that work with a QGraphicsView?

best regards

Andy Brice
http://www.perfecttableplan.com
http://www.successfulsoftware.net