IgorReader.py @ b4293d2

ESS_GUIESS_GUI_DocsESS_GUI_batch_fittingESS_GUI_bumps_abstractionESS_GUI_iss1116ESS_GUI_iss879ESS_GUI_iss959ESS_GUI_openclESS_GUI_orderingESS_GUI_sync_sascalccostrafo411magnetic_scattrelease-4.1.1release-4.1.2release-4.2.2release_4.0.1ticket-1009ticket-1094-headlessticket-1242-2d-resolutionticket-1243ticket-1249ticket885unittest-saveload

Last change on this file since b4293d2 was ad8034f, checked in by Jae Cho <jhjcho@…>, 13 years ago
updated dataloader calls
Property mode set to `100644`
File size: 10.7 KB

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1
2	############################################################################
3	#This software was developed by the University of Tennessee as part of the
4	#Distributed Data Analysis of Neutron Scattering Experiments (DANSE)
5	#project funded by the US National Science Foundation.
6	#If you use DANSE applications to do scientific research that leads to
7	#publication, we ask that you acknowledge the use of the software with the
8	#following sentence:
9	#This work benefited from DANSE software developed under NSF award DMR-0520547.
10	#copyright 2008, University of Tennessee
11	#############################################################################
12
13	"""
14	IGOR 2D reduced file reader
15	"""
16
17	import os
18	#import sys
19	import numpy
20	import math
21	#import logging
22	from sans.dataloader.data_info import Data2D
23	from sans.dataloader.data_info import Detector
24	from sans.dataloader.manipulations import reader2D_converter
25
26	# Look for unit converter
27	has_converter = True
28	try:
29	from data_util.nxsunit import Converter
30	except:
31	has_converter = False
32
33	class Reader:
34	""" Simple data reader for Igor data files """
35	## File type
36	type_name = "IGOR 2D"
37	## Wildcards
38	type = ["IGOR 2D files (.ASC)\|.ASC"]
39	## Extension
40	ext=['.ASC', '.asc']
41
42	def read(self,filename=None):
43	""" Read file """
44	if not os.path.isfile(filename):
45	raise ValueError, \
46	"Specified file %s is not a regular file" % filename
47
48	# Read file
49	f = open(filename,'r')
50	buf = f.read()
51
52	# Instantiate data object
53	output = Data2D()
54	output.filename = os.path.basename(filename)
55	detector = Detector()
56	if len(output.detector)>0: print str(output.detector[0])
57	output.detector.append(detector)
58
59	# Get content
60	dataStarted = False
61
62
63	lines = buf.split('\n')
64	itot = 0
65	x = []
66	y = []
67
68	ncounts = 0
69
70	xmin = None
71	xmax = None
72	ymin = None
73	ymax = None
74
75	i_x = 0
76	i_y = -1
77	i_tot_row = 0
78
79	isInfo = False
80	isCenter = False
81
82	data_conv_q = None
83	data_conv_i = None
84
85	if has_converter == True and output.Q_unit != '1/A':
86	data_conv_q = Converter('1/A')
87	# Test it
88	data_conv_q(1.0, output.Q_unit)
89
90	if has_converter == True and output.I_unit != '1/cm':
91	data_conv_i = Converter('1/cm')
92	# Test it
93	data_conv_i(1.0, output.I_unit)
94
95	for line in lines:
96
97	# Find setup info line
98	if isInfo:
99	isInfo = False
100	line_toks = line.split()
101	# Wavelength in Angstrom
102	try:
103	wavelength = float(line_toks[1])
104	except:
105	msg = "IgorReader: can't read this file, missing wavelength"
106	raise ValueError, msg
107
108	#Find # of bins in a row assuming the detector is square.
109	if dataStarted == True:
110	try:
111	value = float(line)
112	except:
113	# Found a non-float entry, skip it
114	continue
115
116	# Get total bin number
117
118	i_tot_row += 1
119	i_tot_row=math.ceil(math.sqrt(i_tot_row))-1
120	#print "i_tot", i_tot_row
121	size_x = i_tot_row#192#128
122	size_y = i_tot_row#192#128
123	output.data = numpy.zeros([size_x,size_y])
124	output.err_data = numpy.zeros([size_x,size_y])
125
126	#Read Header and 2D data
127	for line in lines:
128	# Find setup info line
129	if isInfo:
130	isInfo = False
131	line_toks = line.split()
132	# Wavelength in Angstrom
133	try:
134	wavelength = float(line_toks[1])
135	except:
136	msg = "IgorReader: can't read this file, missing wavelength"
137	raise ValueError, msg
138	# Distance in meters
139	try:
140	distance = float(line_toks[3])
141	except:
142	msg = "IgorReader: can't read this file, missing distance"
143	raise ValueError, msg
144
145	# Distance in meters
146	try:
147	transmission = float(line_toks[4])
148	except:
149	msg = "IgorReader: can't read this file, "
150	msg += "missing transmission"
151	raise ValueError, msg
152
153	if line.count("LAMBDA")>0:
154	isInfo = True
155
156	# Find center info line
157	if isCenter:
158	isCenter = False
159	line_toks = line.split()
160
161	# Center in bin number: Must substrate 1 because
162	#the index starts from 1
163	center_x = float(line_toks[0])-1
164	center_y = float(line_toks[1])-1
165
166	if line.count("BCENT")>0:
167	isCenter = True
168
169
170	# Find data start
171	if line.count("***")>0:
172	dataStarted = True
173
174	# Check that we have all the info
175	if wavelength == None \
176	or distance == None \
177	or center_x == None \
178	or center_y == None:
179	msg = "IgorReader:Missing information in data file"
180	raise ValueError, msg
181
182	if dataStarted == True:
183	try:
184	value = float(line)
185	except:
186	# Found a non-float entry, skip it
187	continue
188
189	# Get bin number
190	if math.fmod(itot, i_tot_row)==0:
191	i_x = 0
192	i_y += 1
193	else:
194	i_x += 1
195
196	output.data[i_y][i_x] = value
197	ncounts += 1
198
199	# Det 640 x 640 mm
200	# Q = 4pi/lambda sin(theta/2)
201	# Bin size is 0.5 cm
202	#REmoved +1 from theta = (i_x-center_x+1)*0.5 / distance
203	# / 100.0 and
204	#REmoved +1 from theta = (i_y-center_y+1)*0.5 /
205	# distance / 100.0
206	#ToDo: Need complete check if the following
207	# covert process is consistent with fitting.py.
208	theta = (i_x-center_x)*0.5 / distance / 100.0
209	qx = 4.0math.pi/wavelength math.sin(theta/2.0)
210
211	if has_converter == True and output.Q_unit != '1/A':
212	qx = data_conv_q(qx, units=output.Q_unit)
213
214	if xmin==None or qx<xmin:
215	xmin = qx
216	if xmax==None or qx>xmax:
217	xmax = qx
218
219	theta = (i_y-center_y)*0.5 / distance / 100.0
220	qy = 4.0math.pi/wavelength math.sin(theta/2.0)
221
222	if has_converter == True and output.Q_unit != '1/A':
223	qy = data_conv_q(qy, units=output.Q_unit)
224
225	if ymin==None or qy<ymin:
226	ymin = qy
227	if ymax==None or qy>ymax:
228	ymax = qy
229
230	if not qx in x:
231	x.append(qx)
232	if not qy in y:
233	y.append(qy)
234
235	itot += 1
236
237
238	theta = 0.25 / distance / 100.0
239	xstep = 4.0math.pi/wavelength math.sin(theta/2.0)
240
241	theta = 0.25 / distance / 100.0
242	ystep = 4.0math.pi/wavelength math.sin(theta/2.0)
243
244	# Store all data ######################################
245	# Store wavelength
246	if has_converter==True and output.source.wavelength_unit != 'A':
247	conv = Converter('A')
248	wavelength = conv(wavelength, units=output.source.wavelength_unit)
249	output.source.wavelength = wavelength
250
251	# Store distance
252	if has_converter==True and detector.distance_unit != 'm':
253	conv = Converter('m')
254	distance = conv(distance, units=detector.distance_unit)
255	detector.distance = distance
256
257	# Store transmission
258	output.sample.transmission = transmission
259
260	# Store pixel size
261	pixel = 5.0
262	if has_converter==True and detector.pixel_size_unit != 'mm':
263	conv = Converter('mm')
264	pixel = conv(pixel, units=detector.pixel_size_unit)
265	detector.pixel_size.x = pixel
266	detector.pixel_size.y = pixel
267
268	# Store beam center in distance units
269	detector.beam_center.x = center_x*pixel
270	detector.beam_center.y = center_y*pixel
271
272
273	# Store limits of the image (2D array)
274	xmin =xmin-xstep/2.0
275	xmax =xmax+xstep/2.0
276	ymin =ymin-ystep/2.0
277	ymax =ymax+ystep/2.0
278	if has_converter == True and output.Q_unit != '1/A':
279	xmin = data_conv_q(xmin, units=output.Q_unit)
280	xmax = data_conv_q(xmax, units=output.Q_unit)
281	ymin = data_conv_q(ymin, units=output.Q_unit)
282	ymax = data_conv_q(ymax, units=output.Q_unit)
283	output.xmin = xmin
284	output.xmax = xmax
285	output.ymin = ymin
286	output.ymax = ymax
287
288	# Store x and y axis bin centers
289	output.x_bins = x
290	output.y_bins = y
291
292	# Units
293	if data_conv_q is not None:
294	output.xaxis("\\rm{Q_{x}}", output.Q_unit)
295	output.yaxis("\\rm{Q_{y}}", output.Q_unit)
296	else:
297	output.xaxis("\\rm{Q_{x}}", 'A^{-1}')
298	output.yaxis("\\rm{Q_{y}}", 'A^{-1}')
299
300	if data_conv_i is not None:
301	output.zaxis("\\rm{Intensity}", output.I_unit)
302	else:
303	output.zaxis("\\rm{Intensity}","cm^{-1}")
304
305	# Store loading process information
306	output.meta_data['loader'] = self.type_name
307	output = reader2D_converter(output)
308
309	return output
310
311	if __name__ == "__main__":
312	reader = Reader()
313	print reader.read("../test/MAR07232_rest.ASC")
314

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source: sasview/sansdataloader/src/sans/dataloader/readers/IgorReader.py @ b4293d2

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