QGraphicsView and QGraphicsItem: don´t scale item when scaling the view rect

Question

I am using Qt´s QGraphicsView - and QGraphicsItem-subclasses. is there a way to not scale the graphical representation of the item in the view when the

Answer 1

The following solution worked perfectly for me:

void MyDerivedQGraphicsItem::paint(QPainter *painter, const StyleOptionGraphicsItem *option, QWidget *widget)
{
    double scaleValue = scale()/painter->transform().m11();
    painter->save();
    painter->scale(scaleValue, scaleValue);
    painter->drawText(...);
    painter->restore();
    ...
}

We can also multiply the scaleValue by other mesures we want to keep its size constant outside the save/restore environment.

    QPointF ref(500, 500);
    QPointF vector = scaleValue * QPointF(100, 100);
    painter->drawLine(ref+vector, ref-vector);