Handle the DefineShape tag.

def _handle_tag_defineshape(self):
        """Handle the DefineShape tag."""
        obj = _make_object("DefineShape")
        obj.ShapeId = unpack_ui16(self._src)
        obj.ShapeBounds = self._get_struct_rect()
        obj.Shapes = self._get_struct_shapewithstyle(1)
        return obj