| 1 | import os, sys |
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| 2 | import pylab |
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| 3 | from copy import deepcopy |
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| 4 | import math,logging |
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| 5 | class Reader: |
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| 6 | """ Simple data reader for Igor data files """ |
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| 7 | ext=['.ASC'] |
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| 8 | def __init__(self, filename=None): |
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| 9 | """ Init |
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| 10 | @param filename: Name of Igor data file to read |
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| 11 | """ |
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| 12 | self.file = filename |
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| 13 | self.x = [] |
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| 14 | self.y = [] |
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| 15 | self.image = [] |
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| 16 | |
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| 17 | # Detector info |
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| 18 | self.wavelength = 0.0 |
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| 19 | self.distance = 0.0 |
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| 20 | self.center_x = 63.5 |
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| 21 | self.center_y = 63.5 |
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| 22 | |
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| 23 | def read(self,filename=None): |
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| 24 | """ Read file """ |
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| 25 | # Check if the file is there |
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| 26 | self.file=filename |
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| 27 | if not os.path.isfile(self.file): |
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| 28 | raise ValueError, \ |
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| 29 | "Specified file %s is not a regular file" % self.file |
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| 30 | |
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| 31 | # Read file |
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| 32 | f = open(self.file,'r') |
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| 33 | buf = f.read() |
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| 34 | |
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| 35 | # Get content |
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| 36 | dataStarted = False |
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| 37 | |
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| 38 | |
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| 39 | lines = buf.split('\n') |
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| 40 | itot = 0 |
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| 41 | self.x = [] |
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| 42 | self.y = [] |
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| 43 | self.image = [] |
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| 44 | |
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| 45 | ncounts = 0 |
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| 46 | |
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| 47 | #x = pylab.arange(0, 128, 1) |
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| 48 | #y = pylab.arange(0, 128, 1) |
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| 49 | x = pylab.arange(-.5, .5, 1.0/128) |
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| 50 | y = pylab.arange(-.5, .5, 1.0/128) |
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| 51 | X, Y = pylab.meshgrid(x, y) |
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| 52 | Z = deepcopy(X) |
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| 53 | |
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| 54 | xmin = None |
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| 55 | xmax = None |
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| 56 | ymin = None |
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| 57 | ymax = None |
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| 58 | |
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| 59 | i_x = 0 |
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| 60 | i_y = -1 |
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| 61 | |
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| 62 | isInfo = False |
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| 63 | isCenter = False |
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| 64 | for line in lines: |
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| 65 | |
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| 66 | # Find setup info line |
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| 67 | if isInfo: |
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| 68 | isInfo = False |
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| 69 | line_toks = line.split() |
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| 70 | # Wavelength in Angstrom |
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| 71 | try: |
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| 72 | wavelength = float(line_toks[1]) |
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| 73 | except: |
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| 74 | raise ValueError,"IgorReader: can't read this file, missing wavelength" |
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| 75 | # Distance in meters |
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| 76 | try: |
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| 77 | distance = float(line_toks[3]) |
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| 78 | except: |
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| 79 | raise ValueError,"IgorReader: can't read this file, missing distance" |
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| 80 | |
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| 81 | if line.count("LAMBDA")>0: |
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| 82 | isInfo = True |
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| 83 | |
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| 84 | # Find center info line |
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| 85 | if isCenter: |
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| 86 | isCenter = False |
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| 87 | line_toks = line.split() |
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| 88 | # Center in bin number |
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| 89 | center_x = float(line_toks[0]) |
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| 90 | center_y = float(line_toks[1]) |
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| 91 | |
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| 92 | if line.count("BCENT")>0: |
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| 93 | isCenter = True |
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| 94 | |
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| 95 | |
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| 96 | # Find data start |
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| 97 | if line.count("***")>0: |
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| 98 | dataStarted = True |
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| 99 | |
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| 100 | # Check that we have all the info |
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| 101 | if wavelength == None \ |
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| 102 | or distance == None \ |
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| 103 | or center_x == None \ |
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| 104 | or center_y == None: |
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| 105 | raise ValueError, "IgorReader:Missing information in data file" |
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| 106 | |
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| 107 | if dataStarted == True: |
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| 108 | try: |
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| 109 | value = float(line) |
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| 110 | except: |
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| 111 | continue |
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| 112 | |
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| 113 | # Get bin number |
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| 114 | if math.fmod(itot, 128)==0: |
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| 115 | i_x = 0 |
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| 116 | i_y += 1 |
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| 117 | else: |
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| 118 | i_x += 1 |
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| 119 | |
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| 120 | Z[i_y][i_x] = value |
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| 121 | ncounts += 1 |
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| 122 | |
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| 123 | # Det 640 x 640 mm |
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| 124 | # Q = 4pi/lambda sin(theta/2) |
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| 125 | # Bin size is 0.5 cm |
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| 126 | theta = (i_x-center_x+1)*0.5 / distance / 100.0 |
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| 127 | qx = 4.0*math.pi/wavelength * math.sin(theta/2.0) |
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| 128 | if xmin==None or qx<xmin: |
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| 129 | xmin = qx |
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| 130 | if xmax==None or qx>xmax: |
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| 131 | xmax = qx |
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| 132 | |
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| 133 | theta = (i_y-center_y+1)*0.5 / distance / 100.0 |
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| 134 | qy = 4.0*math.pi/wavelength * math.sin(theta/2.0) |
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| 135 | if ymin==None or qy<ymin: |
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| 136 | ymin = qy |
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| 137 | if ymax==None or qy>ymax: |
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| 138 | ymax = qy |
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| 139 | |
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| 140 | |
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| 141 | if not qx in self.x: |
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| 142 | self.x.append(qx) |
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| 143 | if not qy in self.y: |
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| 144 | self.y.append(qy) |
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| 145 | |
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| 146 | itot += 1 |
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| 147 | |
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| 148 | |
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| 149 | theta = 0.25 / distance / 100.0 |
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| 150 | xstep = 4.0*math.pi/wavelength * math.sin(theta/2.0) |
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| 151 | |
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| 152 | theta = 0.25 / distance / 100.0 |
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| 153 | ystep = 4.0*math.pi/wavelength * math.sin(theta/2.0) |
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| 154 | |
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| 155 | # Store q max |
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| 156 | if xmax>ymax: |
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| 157 | self.qmax = xmax |
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| 158 | else: |
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| 159 | self.qmax = ymax |
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| 160 | |
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| 161 | #config.printEVT("Read %g points from file %s" % (ncounts, self.file)) |
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| 162 | |
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| 163 | self.wavelength = wavelength |
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| 164 | self.distance = distance*1000.0 |
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| 165 | self.center_x = center_x |
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| 166 | self.center_y = center_y |
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| 167 | logging.info("IgorReader reading %s"%self.file) |
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| 168 | return Z, xmin-xstep/2.0, xmax+xstep/2.0, ymin-ystep/2.0, ymax+ystep/2.0 |
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| 169 | |
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