code: def _compute_bounds(self, axis, view):
          
          is_vertical = self._is_vertical
          pos = self._pos
          if axis == 0 and is_vertical:
              return (pos[0, 0], pos[0, 0])
          elif axis == 1 and not is_vertical:
              return (self._pos[0, 1], self._pos[0, 1])
  
          return None
docs: Return the (min, max) bounding values of this visual along *axis*
          in the local coordinate system.