'Returns how offsets are applied for the collection.  If
*offset_position* is \'screen\', the offset is applied after the
master transform has been applied, that is, the offsets are in
screen coordinates.  If offset_position is \'data\', the offset
is applied before the master transform, i.e., the offsets are
in data coordinates.'

def get_offset_position(self):

    return self._offset_position
