Source code for mxcubecore.HardwareObjects.Resolution

# -*- coding: utf-8 -*-
#
#  Project name: MXCuBE
#  https://github.com/mxcube
#
#  This file is part of MXCuBE software.
#
#  MXCuBE is free software: you can redistribute it and/or modify
#  it under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  MXCuBE is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU Lesser General Public License for more details.
#
#  You should have received a copy of the GNU General Lesser Public License
#  along with MXCuBE. If not, see <http://www.gnu.org/licenses/>.
"""Resolution concrete implementation.
Example xml file:
<object class="Resolution">
  <username>Resolution</username>
  <actuator_name>resolution</actuator_name>
  <tolerance>1e-4</tolerance>
  <!-- optional -->
  <object href="/pilatus" role="detector"/>
</object>

"""

from mxcubecore.HardwareObjects.abstract.AbstractResolution import AbstractResolution

__copyright__ = """ Copyright © 2010-2020 by the MXCuBE collaboration """
__license__ = "LGPLv3+"


class Resolution(AbstractResolution):
    """Resolution as motor"""

    def set_value(self, value, timeout=None):
        """Set the resolution.
        Args:
            value(float): target value [Å]
            timeout(float): optional - timeout [s],
                             if timeout is None: wait forever (default).
        """
        # The precision depends on the difference between the current
        # resolution and the target value - the smaller the difference,
        # the better the precision.
        # We move twice to get the closet possible to the requested resolution.
        super().set_value(value, timeout)
        super().set_value(value, timeout)