Pen thickness in pixel for QGraphicsItem

[jj382]

Hi,

How can I specify the thickness of the the QPainter's QPen in QGraphicsItem in terms of pixels (fixed) regardless of scene transformation? QGraphicsItem::ItemIgnoresTransformation would ignore all transformations. I would like to set only thickness of QPainter's pen.

As an edit:

Example would be equivalence to a QGraphicsLineItem with a constant line thickness (specified in pixels) even with zooming in/out.