deltaX = deltaY = 40.
# move line
aSession.startOperation()
-aLineStartPoint.setValue(aLineStartPoint.x() + deltaX,
+anArcStartPoint.setValue(aLineStartPoint.x() + deltaX,
aLineStartPoint.y() + deltaY)
-aLineEndPoint.setValue(aLineEndPoint.x() + deltaX,
+anArcEndPoint.setValue(aLineEndPoint.x() + deltaX,
aLineEndPoint.y() + deltaY)
aSession.finishOperation()
# check that arc's points are moved also