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#/*##########################################################################
# Copyright (C) 2008-2013 European Synchrotron Radiation Facility
#
# This file is part of the PyMca X-ray Fluorescence Toolkit developed at
# the ESRF by the Software group.
#
# This file 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 2 of the License, or (at your
# option) any later version.
#
# PyMca 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.
#
#############################################################################*/
import os
import sys
import re
import struct
import numpy
import copy
from PyMca import DataObject
DEBUG = 0
SOURCE_TYPE = "EdfFileStack"
class OmnicMap(DataObject.DataObject):
'''
Class to read OMNIC .map files
It reads the spectra into a DataObject instance.
This class info member contains all the parsed information.
This class data member contains the map itself as a 3D array.
'''
def __init__(self, filename):
'''
Parameters:
-----------
filename : str
Name of the .map file.
It is expected to work with OMNIC versions 7.x and 8.x
'''
DataObject.DataObject.__init__(self)
if sys.platform == 'win32':
fid = open(filename, 'rb')
else:
fid = open(filename, 'r')
data = fid.read()
fid.close()
try:
omnicInfo = self._getOmnicInfo(data)
except:
omnicInfo = None
self.sourceName = [filename]
if sys.version < '3.0':
searchedChain = "Spectrum "
else:
searchedChain = bytes("Spectrum ", 'utf-8')
firstByte = data.index(searchedChain)
s = data[firstByte:(firstByte + 100 - 16)]
if sys.version >= '3.0':
s = str(s)
if DEBUG:
print("firstByte = %d" % firstByte)
print("s1 = %s " % s)
exp = re.compile('(-?[0-9]+\.?[0-9]*)')
tmpValues = exp.findall(s)
spectrumIndex = int(tmpValues[0])
self.nSpectra = int(tmpValues[1])
if "X = " in s:
xPosition = float(tmpValues[2])
yPosition = float(tmpValues[3])
else:
# I have to calculate them from the scan
xPosition, yPosition = self.getPositionFromIndexAndInfo(0, omnicInfo)
if DEBUG:
print("spectrumIndex, nSpectra, xPosition, yPosition = %d %d %f %f" %\
(spectrumIndex, self.nSpectra, xPosition, yPosition))
if sys.version < '3.0':
chain = "Spectrum"
else:
chain = bytes("Spectrum", 'utf-8')
secondByte = data[(firstByte + 1):].index(chain)
secondByte += firstByte + 1
if DEBUG:
print("secondByte = ", secondByte)
self.nChannels = int((secondByte - firstByte - 100) / 4)
if DEBUG:
print("nChannels = %d" % self.nChannels)
self.firstSpectrumOffset = firstByte - 16
#fill the header
self.header = []
oldXPosition = xPosition
oldYPosition = yPosition
self.nRows = 0
for i in range(self.nSpectra):
offset = int(firstByte + i * (100 + self.nChannels * 4))
if sys.version < '3.0':
s = data[offset:(offset + 100 - 16)]
else:
s = str(data[offset:(offset + 100 - 16)])
tmpValues = exp.findall(s)
spectrumIndex = int(tmpValues[0])
if "X = " in s:
xPosition = float(tmpValues[2])
yPosition = float(tmpValues[3])
else:
#I have to calculate them from the scan
xPosition, yPosition = self.getPositionFromIndexAndInfo(i, omnicInfo)
if (abs(yPosition - oldYPosition) > 1.0e-6) and\
(abs(xPosition - oldXPosition) < 1.0e-6):
break
self.nRows = self.nRows + 1
if DEBUG:
print("DIMENSIONS X = %f Y=%d" %\
((self.nSpectra * 1.0) / self.nRows, self.nRows))
#arrange as an EDF Stack
self.info = {}
self.__nFiles = int(self.nSpectra / self.nRows)
self.data = numpy.zeros((self.__nFiles, self.nRows, self.nChannels),
dtype=numpy.float32)
self.__nImagesPerFile = 1
offset = firstByte - 16 + 100 # starting position of the data
delta = 100 + self.nChannels * 4
fmt = "%df" % self.nChannels
for i in range(self.__nFiles):
for j in range(self.nRows):
# this approach is inneficient when compared to a direct
# data readout, but it allows to deal with nan at the source
tmpData = numpy.zeros((self.nChannels,), dtype=numpy.float32)
tmpData[:] = struct.unpack(fmt,\
data[offset:(offset + delta - 100)])
finiteData = numpy.isfinite(tmpData)
self.data[i, j, finiteData] = tmpData[finiteData]
offset = int(offset + delta)
shape = self.data.shape
for i in range(len(shape)):
key = 'Dim_%d' % (i + 1,)
self.info[key] = shape[i]
self.info["SourceType"] = SOURCE_TYPE
self.info["SourceName"] = self.sourceName
self.info["Size"] = self.__nFiles * self.__nImagesPerFile
self.info["NumberOfFiles"] = self.__nFiles * 1
self.info["FileIndex"] = 0
self.info["Channel0"] = 0.0
if omnicInfo is not None:
self.info['McaCalib'] = [omnicInfo['First X value'] * 1.0,
omnicInfo['Data spacing'] * 1.0,
0.0]
else:
self.info["McaCalib"] = [0.0, 1.0, 0.0]
self.info['OmnicInfo'] = omnicInfo
def _getOmnicInfo(self, data):
'''
Parameters:
-----------
data : The contents of the .map file
Returns:
--------
A dictionnary with acquisition information
'''
#additional information
fmt = "I" # unsigned long in 32-bit
offset = 372 # 93*4 unsigned integers
infoBlockIndex = (struct.unpack(fmt, data[offset:(offset + 4)])[0] - 204) / 4.
infoBlockIndex = int(infoBlockIndex)
#infoblock is the position of the information block
offset = infoBlockIndex * 4
#read 13 unsigned integers
nValues = 13
fmt = "%dI" % nValues
values = struct.unpack(fmt, data[offset:(offset + 4 * nValues)])
ddict = {}
ddict['Number of points'] = values[0]
ddict['Number of scan points'] = values[6]
ddict['Interferogram peak position'] = values[7]
ddict['Number of sample scans'] = values[8]
ddict['Number of FFT points'] = values[10]
ddict['Number of background scans'] = values[12]
offset = (infoBlockIndex + 3) * 4
nFloats = 47
fmt = "%df" % nFloats
vFloats = struct.unpack(fmt, data[offset:(offset + 4 * nFloats)])
lastX = vFloats[0]
firstX = vFloats[1]
ddict['First X value'] = firstX
ddict['Last X value'] = lastX
ddict['Identifier for start indices of spectra'] = vFloats[14]
ddict['Laser frequency'] = vFloats[16]
ddict['Data spacing'] = (lastX - firstX) / (ddict['Number of points'] - 1.0)
ddict['Background gain'] = vFloats[10]
if DEBUG:
for key in ddict.keys():
print(key, ddict[key])
ddict.update(self.getMapInformation(data))
return ddict
def getMapInformation(self, data):
'''
Internal method to help finding spectra coordinates
Parameters:
-----------
data : Contents of the .map file
Returns:
--------
Dictionnary with map gemoetrical acquisition parameters
'''
#look for the chain 'Position'
if sys.version < '3.0':
chain = 'Position'
else:
chain = bytes('Position', 'utf-8')
offset = data.index(chain)
positions = [offset]
while True:
try:
a = data[(offset + 1):].index(chain)
offset = a + offset + 1
positions.append(offset)
except ValueError:
break
ddict = {}
#map description position
if (positions[1] - positions[0]) == 66: # reverse engineered magic number :-)
mapDescriptionOffset = positions[0] - 90
mapDescription = struct.unpack('6f', data[mapDescriptionOffset:mapDescriptionOffset + 24])
y0, y1, deltaY, x0, x1, deltaX = mapDescription
ddict['First map location'] = [x0, y0]
ddict['Last map location'] = [x1, y1]
ddict['Mapping stage X step size'] = deltaX
ddict['Mapping stage Y step size'] = deltaY
ddict['Number of spectra'] = abs((1 + ((y1 - y0) / deltaY)) * (1 + ((x1 - x0) / deltaX)))
if DEBUG:
for key in ddict.keys():
print(key, ddict[key])
return ddict
def getOmnicInfo(self):
"""
Returns a dictionnary with the parsed OMNIC information
"""
return copy.deepcopy(self.info['OmnicInfo'])
def getPositionFromIndexAndInfo(self, index, info=None):
'''
Internal method to obtain the position at which a spectrum
was acquired
Parameters:
-----------
index : int
Index of spectrum
info : Dictionnary
Information recovered with _getOmnicInfo
Returns:
--------
x, y : floats
Position at which the spectrum was acquired.
'''
if info is None:
return 0.0, 0.0
ddict = info
#first variation on X and then on Y
try:
x0, y0 = ddict['First map location']
except KeyError:
return 0.0, 0.0
x1, y1 = ddict['Last map location']
deltaX = ddict['Mapping stage X step size']
deltaY = ddict['Mapping stage Y step size']
nX = int(1 + ((x1 - x0) / deltaX))
x = x0 + (index % nX) * deltaX
y = y0 + int(index / nX) * deltaY
return x, y
if __name__ == "__main__":
filename = None
if len(sys.argv) > 2:
DEBUG = int(sys.argv[2])
if len(sys.argv) > 1:
filename = sys.argv[1]
elif os.path.exists("SambaPhg_IR.map"):
filename = "SambaPhg_IR.map"
if filename is not None:
w = OmnicMap(filename)
print(type(w))
print(type(w.data[0:10]))
print(w.data[0:10])
print("shape = ", w.data.shape)
print(type(w.info))
print("INFO = ", w.info['OmnicInfo'])
else:
print("Please supply input filename")
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