def _get_value(self):
        """
        Return two delegating variables. Each variable should contain
        a value attribute with the real value.
        """
        x, y = self._point.x, self._point.y
        self._px, self._py = self._item_point.canvas.get_matrix_i2i(self._item_point,
                                                                    self._item_target).transform_point(x, y)
        return self._px, self._py
Return two delegating variables. Each variable should contain
        a value attribute with the real value.