def addAnnotationItem(self, item: QGraphicsItem, pos: QPointF):
scene = self.scene()
if scene is None:
return
if isinstance(item, (ArrowItem, RectItem, EllipseItem)):
item.setPen(
QPen(Qt.black, scene.getDefaultPenSizeFromRect(),
Qt.SolidLine))
self._undo_stack.push(AddCommand(item, scene))
item.setPos(pos)
scene.annotationAdded.emit(item)
return item
