QGraphicsview with bad resolution

[raphael_]

Dear all, I have a question about the QGraphics framework. In the case there is already a thread I am sorry, but I did not find one..

If I paint on a QGraphicsscene the lines with width=1 look much thicker than when I paint a line to a widget with a pixmap.

I tried

view->scale(0.5,0.5);

view->scale(0.5,0.5);

To copy to clipboard, switch view to plain text mode 

but then the line thickness depends on the position.

The Renderhints and the Antialiasing had no influence.

Can somebody give me a hint or an approach who to solve the problem. At the end I would like to have diagrams with a high resolution.