[PyQt] QPainter

[lucaberto at libero.it]

Hello using pyqt3 for paint when i click one qbutton i do as follow

gr = QPainter(self.frame3)
gr.drawLine(30,10,30,490)
and the line is draw. 

if i do the same with pyqt4 nothing is draw can you explain me how to proceed

Regards

Luca

In both i use qtdesigner and eric