[11a0319] | 1 | """ |
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[99d1af6] | 2 | DANSE/SANS file reader |
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[11a0319] | 3 | """ |
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| 4 | |
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[b99ac227] | 5 | """ |
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| 6 | This software was developed by the University of Tennessee as part of the |
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| 7 | Distributed Data Analysis of Neutron Scattering Experiments (DANSE) |
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| 8 | project funded by the US National Science Foundation. |
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| 9 | |
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| 10 | If you use DANSE applications to do scientific research that leads to |
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| 11 | publication, we ask that you acknowledge the use of the software with the |
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| 12 | following sentence: |
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| 13 | |
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| 14 | "This work benefited from DANSE software developed under NSF award DMR-0520547." |
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| 15 | |
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| 16 | copyright 2008, University of Tennessee |
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| 17 | """ |
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| 18 | |
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[11a0319] | 19 | import math |
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[99d1af6] | 20 | import os |
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[11a0319] | 21 | import copy |
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| 22 | import numpy |
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[8d6440f] | 23 | import logging |
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[99d1af6] | 24 | from DataLoader.data_info import Data2D, Detector |
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| 25 | |
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| 26 | # Look for unit converter |
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| 27 | has_converter = True |
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| 28 | try: |
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| 29 | from data_util.nxsunit import Converter |
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| 30 | except: |
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| 31 | has_converter = False |
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[16d8e5f] | 32 | |
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[bb03739] | 33 | class Reader: |
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[11a0319] | 34 | """ |
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| 35 | Example data manipulation |
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| 36 | """ |
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| 37 | ## File type |
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| 38 | type = ["DANSE files (*.sans)|*.sans"] |
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| 39 | ## Extension |
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[b99ac227] | 40 | ext = ['.sans', '.SANS'] |
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[11a0319] | 41 | |
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| 42 | def read(self, filename=None): |
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| 43 | """ |
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| 44 | Open and read the data in a file |
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| 45 | @param file: path of the file |
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| 46 | """ |
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| 47 | |
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| 48 | read_it = False |
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| 49 | for item in self.ext: |
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| 50 | if filename.lower().find(item)>=0: |
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| 51 | read_it = True |
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| 52 | |
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| 53 | if read_it: |
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[8d6440f] | 54 | try: |
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| 55 | datafile = open(filename, 'r') |
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| 56 | except : |
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| 57 | raise RuntimeError,"danse_reader cannot open %s"%(filename) |
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[11a0319] | 58 | |
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| 59 | |
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| 60 | # defaults |
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| 61 | # wavelength in Angstrom |
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| 62 | wavelength = 10.0 |
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| 63 | # Distance in meter |
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| 64 | distance = 11.0 |
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| 65 | # Pixel number of center in x |
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| 66 | center_x = 65 |
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| 67 | # Pixel number of center in y |
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| 68 | center_y = 65 |
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| 69 | # Pixel size [mm] |
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| 70 | pixel = 5.0 |
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| 71 | # Size in x, in pixels |
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| 72 | size_x = 128 |
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| 73 | # Size in y, in pixels |
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| 74 | size_y = 128 |
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| 75 | # Format version |
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| 76 | fversion = 1.0 |
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| 77 | |
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[99d1af6] | 78 | output = Data2D() |
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| 79 | output.filename = os.path.basename(filename) |
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| 80 | detector = Detector() |
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| 81 | output.detector.append(detector) |
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| 82 | |
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| 83 | output.data = numpy.zeros([size_x,size_y]) |
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| 84 | output.err_data = numpy.zeros([size_x,size_y]) |
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| 85 | |
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| 86 | data_conv_q = None |
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| 87 | data_conv_i = None |
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| 88 | |
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| 89 | if has_converter == True and output.Q_unit != '1/A': |
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| 90 | data_conv_q = Converter('1/A') |
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| 91 | # Test it |
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| 92 | data_conv_q(1.0, output.Q_unit) |
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| 93 | |
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| 94 | if has_converter == True and output.I_unit != '1/cm': |
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| 95 | data_conv_i = Converter('1/cm') |
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| 96 | # Test it |
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| 97 | data_conv_i(1.0, output.I_unit) |
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| 98 | |
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[11a0319] | 99 | read_on = True |
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| 100 | while read_on: |
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| 101 | line = datafile.readline() |
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| 102 | if line.find("DATA:")>=0: |
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| 103 | read_on = False |
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| 104 | break |
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| 105 | toks = line.split(':') |
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| 106 | if toks[0]=="FORMATVERSION": |
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| 107 | fversion = float(toks[1]) |
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[99d1af6] | 108 | if toks[0]=="WAVELENGTH": |
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| 109 | wavelength = float(toks[1]) |
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[11a0319] | 110 | elif toks[0]=="DISTANCE": |
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| 111 | distance = float(toks[1]) |
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| 112 | elif toks[0]=="CENTER_X": |
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| 113 | center_x = float(toks[1]) |
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| 114 | elif toks[0]=="CENTER_Y": |
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| 115 | center_y = float(toks[1]) |
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| 116 | elif toks[0]=="PIXELSIZE": |
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| 117 | pixel = float(toks[1]) |
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| 118 | elif toks[0]=="SIZE_X": |
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| 119 | size_x = int(toks[1]) |
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| 120 | elif toks[0]=="SIZE_Y": |
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| 121 | size_y = int(toks[1]) |
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| 122 | |
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| 123 | # Read the data |
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| 124 | data = [] |
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| 125 | error = [] |
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| 126 | if fversion==1.0: |
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| 127 | data_str = datafile.readline() |
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| 128 | data = data_str.split(' ') |
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| 129 | else: |
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| 130 | read_on = True |
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| 131 | while read_on: |
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| 132 | data_str = datafile.readline() |
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| 133 | if len(data_str)==0: |
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| 134 | read_on = False |
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| 135 | else: |
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| 136 | toks = data_str.split() |
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| 137 | try: |
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| 138 | val = float(toks[0]) |
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| 139 | err = float(toks[1]) |
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[99d1af6] | 140 | if data_conv_i is not None: |
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| 141 | val = data_conv_i(val, units=output.y_unit) |
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| 142 | err = data_conv_i(err, units=output.y_unit) |
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[11a0319] | 143 | data.append(val) |
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| 144 | error.append(err) |
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| 145 | except: |
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[8d6440f] | 146 | logging.info("Skipping line:%s,%s" %( data_str,sys.exc_value)) |
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[11a0319] | 147 | |
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| 148 | # Initialize |
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| 149 | x_vals = [] |
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| 150 | y_vals = [] |
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| 151 | ymin = None |
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| 152 | ymax = None |
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| 153 | xmin = None |
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| 154 | xmax = None |
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| 155 | |
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| 156 | # Qx and Qy vectors |
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| 157 | for i_x in range(size_x): |
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| 158 | theta = (i_x-center_x+1)*pixel / distance / 100.0 |
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| 159 | qx = 4.0*math.pi/wavelength * math.sin(theta/2.0) |
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[99d1af6] | 160 | |
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| 161 | if has_converter == True and output.Q_unit != '1/A': |
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| 162 | qx = data_conv_q(qx, units=output.Q_unit) |
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| 163 | |
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[11a0319] | 164 | x_vals.append(qx) |
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| 165 | if xmin==None or qx<xmin: |
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| 166 | xmin = qx |
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| 167 | if xmax==None or qx>xmax: |
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| 168 | xmax = qx |
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| 169 | |
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| 170 | ymin = None |
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| 171 | ymax = None |
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| 172 | for i_y in range(size_y): |
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| 173 | theta = (i_y-center_y+1)*pixel / distance / 100.0 |
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| 174 | qy = 4.0*math.pi/wavelength * math.sin(theta/2.0) |
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[99d1af6] | 175 | |
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| 176 | if has_converter == True and output.Q_unit != '1/A': |
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| 177 | qy = data_conv_q(qy, units=output.Q_unit) |
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| 178 | |
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[11a0319] | 179 | y_vals.append(qy) |
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| 180 | if ymin==None or qy<ymin: |
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| 181 | ymin = qy |
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| 182 | if ymax==None or qy>ymax: |
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| 183 | ymax = qy |
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| 184 | |
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[99d1af6] | 185 | # Store the data in the 2D array |
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[b99ac227] | 186 | itot = 0 |
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| 187 | i_x = 0 |
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| 188 | i_y = -1 |
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| 189 | |
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[11a0319] | 190 | for i_pt in range(len(data)): |
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| 191 | try: |
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[99d1af6] | 192 | value = float(data[i_pt]) |
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[11a0319] | 193 | except: |
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[99d1af6] | 194 | # For version 1.0, the data were still |
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| 195 | # stored as strings at this point. |
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| 196 | logging.info("Skipping entry (v1.0):%s,%s" %(str(data[i_pt]), sys.exc_value)) |
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[11a0319] | 197 | |
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| 198 | # Get bin number |
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[b99ac227] | 199 | if math.fmod(i_pt, size_x)==0: |
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[11a0319] | 200 | i_x = 0 |
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| 201 | i_y += 1 |
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| 202 | else: |
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| 203 | i_x += 1 |
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| 204 | |
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[b99ac227] | 205 | output.data[i_y][i_x] = value |
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| 206 | #output.data[size_y-1-i_y][i_x] = value |
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[11a0319] | 207 | if fversion>1.0: |
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[b99ac227] | 208 | output.err_data[i_y][i_x] = error[i_pt] |
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| 209 | #output.err_data[size_y-1-i_y][i_x] = error[i_pt] |
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[11a0319] | 210 | |
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[99d1af6] | 211 | |
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| 212 | # Store all data ###################################### |
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| 213 | # Store wavelength |
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| 214 | if has_converter==True and output.source.wavelength_unit != 'A': |
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| 215 | conv = Converter('A') |
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| 216 | wavelength = conv(wavelength, units=output.source.wavelength_unit) |
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| 217 | output.source.wavelength = wavelength |
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| 218 | |
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| 219 | # Store distance |
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| 220 | if has_converter==True and detector.distance_unit != 'm': |
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| 221 | conv = Converter('m') |
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| 222 | distance = conv(distance, units=detector.distance_unit) |
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| 223 | detector.distance = distance |
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| 224 | |
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| 225 | # Store pixel size |
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| 226 | if has_converter==True and detector.pixel_size_unit != 'mm': |
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| 227 | conv = Converter('mm') |
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| 228 | pixel = conv(pixel, units=detector.pixel_size_unit) |
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| 229 | detector.pixel_size.x = pixel |
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| 230 | detector.pixel_size.y = pixel |
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| 231 | |
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| 232 | # Store beam center in distance units |
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| 233 | detector.beam_center.x = center_x*pixel |
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| 234 | detector.beam_center.y = center_y*pixel |
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| 235 | |
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| 236 | # Store limits of the image (2D array) |
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| 237 | if has_converter == True and output.Q_unit != '1/A': |
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| 238 | xmin = data_conv_q(xmin, units=output.Q_unit) |
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| 239 | xmax = data_conv_q(xmax, units=output.Q_unit) |
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| 240 | ymin = data_conv_q(ymin, units=output.Q_unit) |
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| 241 | ymax = data_conv_q(ymax, units=output.Q_unit) |
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| 242 | output.xmin = xmin |
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| 243 | output.xmax = xmax |
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| 244 | output.ymin = ymin |
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| 245 | output.ymax = ymax |
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| 246 | |
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| 247 | # Store x and y axis bin centers |
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| 248 | output.x_bins = x_vals |
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| 249 | output.y_bins = y_vals |
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| 250 | |
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| 251 | # Units |
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| 252 | if data_conv_q is not None: |
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| 253 | output.xaxis("\\rm{Q}", output.Q_unit) |
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| 254 | output.yaxis("\\rm{Q}", output.Q_unit) |
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| 255 | else: |
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| 256 | output.xaxis("\\rm{Q}", 'A^{-1}') |
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| 257 | output.yaxis("\\rm{Q}", 'A^{-1}') |
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| 258 | |
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| 259 | if data_conv_i is not None: |
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| 260 | output.zaxis("\\{I(Q)}", output.I_unit) |
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| 261 | else: |
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| 262 | output.zaxis("\\rm{I(Q)}","cm^{-1}") |
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[16d8e5f] | 263 | |
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| 264 | if not fversion>=1.0: |
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[c125e0c] | 265 | raise ValueError,"Danse_reader can't read this file %s"%filename |
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[11a0319] | 266 | else: |
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[8d6440f] | 267 | logging.info("Danse_reader Reading %s \n"%filename) |
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[11a0319] | 268 | return output |
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| 269 | |
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| 270 | return None |
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[99d1af6] | 271 | |
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| 272 | if __name__ == "__main__": |
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| 273 | reader = Reader() |
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| 274 | print reader.read("../test/MP_New.sans") |
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| 275 | |
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