QGraphicsItem::NoCache => no antialiasing

Hi,

I'm using the QGraphicsView to display a graph and when I use 'QGraphicsItem::NoCache' for drawing some curves I have no antialiasing.

What is strange is that with other options I have the antialiasing. Of course I also set 'painter->setRenderHint(QPainter::Antialiasing, true);' in the paint method and use 'setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);' on the GraphicsView !

Do you know I have no antialiasing, curves looks stranges ?

Thanks