Multiple QPainters on QImage

[wysota]

Why do you want to repaint the image during every paintEvent? If nothing changed, the image doesn't have to be repainted. Implement a render method for your content that takes a QPainter* as an argument and when you want to repaint the image call it on the image's painter. In the paintEvent call it again but on the widget's painter.

[fire]

Why do you want to repaint the image during every paintEvent? If nothing changed, the image doesn't have to be repainted. Implement a render method for your content that takes a QPainter* as an argument and when you want to repaint the image call it on the image's painter. In the paintEvent call it again but on the widget's painter.

Although I have it set up as a rotating picture, I plan to change the code to read new pixel data from a file source and place it at the top of the picture.

I would also like to be able to place the updated images to another widget and/or save it to a file, hence why I wanted a place holder (the QImage object) for the new image data.

[wysota]

But it doesn't answer why you repaint the image in the paintEvent and not elsewhere. The paintEvent may be called for instance when something obscures your widget. There is no point in redrawing the image in such a situation.