I'm using a QPainter to get some graphics on a window. Unfortunately every time the .paintEvent is run, the whole window is cleared. How can I draw without clearing? I.e. how do I leave the stuff from previous paint event untouched?
I'm using Qt4
I'm using a QPainter to get some graphics on a window. Unfortunately every time the .paintEvent is run, the whole window is cleared. How can I draw without clearing? I.e. how do I leave the stuff from previous paint event untouched?
I'm using Qt4
In Qt3, set the Qt::WNoAutoErase
flag from the WidgetFlags enum to avoid that the window is cleared on each paint event.
You can set this flag by passing it to the QWidget constructor.
You need to set the backgroundMode
by using the setBackgroundMode
setter. The Qt::NoBackground
enum is what you are searching for.