/usr/lib/python2.7/dist-packages/sardana/pool/poolcontrollers/DiscretePseudoMotorController.py is in python-sardana 1.2.0-2.
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##############################################################################
##
## This file is part of Sardana
##
## http://www.tango-controls.org/static/sardana/latest/doc/html/index.html
##
## Copyright 2011 CELLS / ALBA Synchrotron, Bellaterra, Spain
##
## Sardana 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.
##
## Sardana 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 Lesser General Public License
## along with Sardana. If not, see <http://www.gnu.org/licenses/>.
##
##############################################################################
"""This module contains the definition of a discrete pseudo motor controller
for the Sardana Device Pool"""
__all__ = ["DiscretePseudoMotorController"]
__docformat__ = 'restructuredtext'
import json
from sardana import DataAccess
from sardana.pool.controller import PseudoMotorController
from sardana.pool.controller import Type, Access, Description
CALIBRATION = 'Calibration'
LABELS = 'Labels'
class DiscretePseudoMotorController(PseudoMotorController):
"""A discrete pseudo motor controller which converts physical motor positions
to discrete values"""
gender = "DiscretePseudoMotorController"
model = "PseudoMotor"
organization = "Sardana team"
image = ""
pseudo_motor_roles = ("OutputMotor",)
motor_roles = ("InputMotor",)
axis_attributes = {CALIBRATION:#type hackish until arrays supported
{Type : str,
Description : 'Flatten list of a list of triples and [min,cal,max]',
Access : DataAccess.ReadWrite,
'fget' : 'get%s' % CALIBRATION,
'fset' : 'set%s' % CALIBRATION},
LABELS:#type hackish until arrays supported
{Type : str,
Description : 'String list with the meaning of each discrete position',
Access : DataAccess.ReadWrite,
'fget' : 'get%s' % LABELS,
'fset' : 'set%s' % LABELS}
}
def __init__(self, inst, props, *args, **kwargs):
PseudoMotorController.__init__(self, inst, props, *args, **kwargs)
self._calibration = None
self._positions = None
self._labels = None
def GetAxisAttributes(self, axis):
axis_attrs = PseudoMotorController.GetAxisAttributes(self, axis)
axis_attrs = dict(axis_attrs)
axis_attrs['Position']['type'] = int
return axis_attrs
def CalcPseudo(self, axis, physical_pos, curr_pseudo_pos):
llabels = len(self._labels)
positions = self._positions
calibration = self._calibration
lcalibration = len(calibration)
value = physical_pos[0]
#case 0: nothing to translate, only round about integer the attribute value
if llabels == 0:
return int(value)
#case 1: only uses the labels. Available positions in POSITIONS
elif lcalibration == 0:
value = int(value)
try: positions.index(value)
except: raise Exception("Invalid position.")
else: return value
#case 1+fussy: the physical position must be in one of the defined
#ranges, and the DiscretePseudoMotor position is defined in labels
elif llabels == lcalibration:
for fussyPos in calibration:
if value >= fussyPos[0] and value <= fussyPos[2]:
return positions[calibration.index(fussyPos)]
#if the loop ends, current value is not in the fussy areas.
raise Exception("Invalid position.")
else:
raise Exception("Bad configuration on axis attributes.")
def CalcPhysical(self, axis, pseudo_pos, curr_physical_pos):
#If Labels is well defined, the write value must be one this struct
llabels = len(self._labels)
positions = self._positions
calibration = self._calibration
lcalibration = len(calibration)
value = pseudo_pos[0]
#case 0: nothing to translate, what is written goes to the attribute
if llabels == 0:
return value
#case 1: only uses the labels. Available positions in POSITIONS
elif lcalibration == 0:
self._log.debug("Value = %s", value)
try: positions.index(value)
except: raise Exception("Invalid position.")
return value
#case 1+fussy: the write to the to the DiscretePseudoMotorController
#is translated to the central position of the calibration.
elif llabels == lcalibration:
self._log.debug("Value = %s", value)
try: destination = positions.index(value)
except: raise Exception("Invalid position.")
self._log.debug("destination = %s", destination)
calibrated_position = calibration[destination][1]#central element
self._log.debug("calibrated_position = %s", calibrated_position)
return calibrated_position
def getLabels(self,axis):
#hackish until we support DevVarDoubleArray in extra attrs
labels = self._labels
positions = self._positions
labels_str = ""
for i in range(len(labels)):
labels_str += "%s:%d "%(labels[i],positions[i])
return labels_str[:-1]#remove the final space
def setLabels(self,axis,value):
#hackish until we support DevVarStringArray in extra attrs
labels = []
positions = []
for pair in value.split():
l,p = pair.split(':')
labels.append(l)
positions.append(int(p))
if len(labels) == len(positions):
self._labels = labels
self._positions = positions
else:
raise Exception("Rejecting labels: invalid structure")
def getCalibration(self,axis):
return json.dumps(self._calibration)
def setCalibration(self,axis,value):
try:
self._calibration = json.loads(value)
except:
raise Exception("Rejecting calibration: invalid structure")
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