code: def _add_sp(self, autoshape_type, x, y, cx, cy):
          
          id_ = self._next_shape_id
          name = '%s %d' % (autoshape_type.basename, id_-1)
          sp = self._grpSp.add_autoshape(
              id_, name, autoshape_type.prst, x, y, cx, cy
          )
          return sp
docs: Return newly-added `p:sp` element as specified.
  
          `p:sp` element is of *autoshape_type* at position (*x*, *y*) and of
          size (*cx*, *cy*).