code: def sceneRect( self ):
          
          pos     = self.scenePos()
          rect    = self.rect()
          return QRectF(pos.x(), pos.y(), rect.width(), rect.height())
docs: Returns the scene geometry for this node by resolving any \
          inheritance position data since QGraphicsItem's return \
          relative-space positions.
          
          :return     <QRectF>