code: def _start_path(self, sp):
          
          path = sp.add_path(w=self._dx, h=self._dy)
          path.add_moveTo(
              *self._local_to_shape(
                  self._start_x, self._start_y
              )
          )
          return path
docs: Return a newly created `a:path` element added to *sp*.
  
          The returned `a:path` element has an `a:moveTo` element representing
          the shape starting point as its only child.