code: def offset_to_data(self, off_x, off_y, center=None):
          
          if center is not None:
              self.logger.warning("`center` keyword is ignored and will be deprecated")
  
          arr_pts = np.asarray((off_x, off_y)).T
          return self.tform['data_to_cartesian'].from_(arr_pts).T[:2]
docs: Get the closest coordinates in the data array to those
          in cartesian fixed (non-scaled) canvas coordinates.
  
          Parameters
          ----------
          off_x, off_y : float or ndarray
              Cartesian canvas coordinates.
  
          Returns
          -------
          coord : tuple
              Data coordinates in the form of ``(x, y)``.