A.) read about QGraphicsView.
B.) If you simply want to paint the layer on a widget you should read about QPainter and how you can set the opacity etc. QPainter::setOpacity().
Advanced user
Re: creating surfaces
A.) read about QGraphicsView.
B.) If you simply want to paint the layer on a widget you should read about QPainter and how you can set the opacity etc. QPainter::setOpacity().
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