1 # Copyright (C) 2008-2010 Massimo Sandal <devicerandom@gmail.com>
2 # W. Trevor King <wking@drexel.edu>
4 # This file is part of Hooke.
6 # Hooke is free software: you can redistribute it and/or modify it
7 # under the terms of the GNU Lesser General Public License as
8 # published by the Free Software Foundation, either version 3 of the
9 # License, or (at your option) any later version.
11 # Hooke is distributed in the hope that it will be useful, but WITHOUT
12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14 # Public License for more details.
16 # You should have received a copy of the GNU Lesser General Public
17 # License along with Hooke. If not, see
18 # <http://www.gnu.org/licenses/>.
20 """Driver for JPK ForceRobot's velocity clamp data format.
22 This driver is based on JPK's :file:`JPKForceSpec.txt` version 0.12.
23 The specs are freely available from JPK, just email support@jpk.com.
32 from .. import curve as curve
33 from ..util.util import Closing as Closing
34 from ..util.si import join_data_label, split_data_label
35 from . import Driver as Driver
38 class JPKDriver (Driver):
39 """Handle JPK ForceRobot's data format.
42 super(JPKDriver, self).__init__(name='jpk')
44 def is_me(self, path):
45 if os.path.isdir(path):
47 if zipfile.is_zipfile(path): # JPK file versions since at least 0.5
48 with Closing(zipfile.ZipFile(path, 'r')) as f:
49 if 'header.properties' not in f.namelist():
51 with Closing(f.open('header.properties')) as h:
52 if 'jpk-data-file' in h.read():
55 with Closing(open(path, 'r')) as f:
58 headlines.append(f.readline())
59 if headlines[0].startswith('# xPosition') \
60 and headlines[1].startswith('# yPosition'):
64 def read(self, path, info=None):
67 if zipfile.is_zipfile(path): # JPK file versions since at least 0.5
68 return self._read_zip(path, info)
70 return self._read_old(path, info)
72 def _read_zip(self, path, info):
73 with Closing(zipfile.ZipFile(path, 'r')) as f:
75 zip_info = self._zip_info(f)
77 for i in range(len([p for p in f.namelist()
78 if p.endswith('segment-header.properties')])):
79 segments.append(self._zip_segment(f, path, info, zip_info, i))
80 if zip_info['file-format-version'] not in ['0.%d' % i
82 raise NotImplementedError(
83 'JPK file version %s not supported (yet).'
84 % zip_info['file-format-version'])
85 curve_info = self._zip_translate_params(zip_info,
86 segments[0].info['raw info'])
87 for segment in segments: # HACK, should use curve-level spring constant
88 segment.info['spring constant (N/m)'] = \
89 curve_info['spring constant (N/m)']
90 return (segments, curve_info)
92 def _zip_info(self, zipfile):
93 with Closing(zipfile.open('header.properties')) as f:
94 info = self._parse_params(f.readlines())
97 def _zip_segment(self, zipfile, path, info, zip_info, index):
98 prop_file = zipfile.open(os.path.join(
99 'segments', str(index), 'segment-header.properties'))
100 prop = self._parse_params(prop_file.readlines())
102 expected_shape = (int(prop['force-segment-header']['num-points']),)
104 for chan in prop['channels']['list']:
105 chan_info = prop['channel'][chan]
106 channels.append(self._zip_channel(zipfile, index, chan, chan_info))
107 if channels[-1].shape != expected_shape:
108 raise NotImplementedError(
109 'Channel %d:%s in %s has strange shape %s != %s'
110 % (index, chan, zipfile.path,
111 channels[-1].shape, expected_shape))
113 shape=(len(channels[0]), len(channels)),
114 dtype=channels[0].dtype,
115 info=self._zip_translate_segment_params(prop))
116 for i,chan in enumerate(channels):
118 return self._zip_scale_segment(d, path, info)
120 def _zip_channel(self, zipfile, segment_index, channel_name, chan_info):
121 f = zipfile.open(os.path.join(
122 'segments', str(segment_index),
123 chan_info['data']['file']['name']), 'r')
124 assert chan_info['data']['file']['format'] == 'raw', \
125 'Non-raw data format:\n%s' % pprint.pformat(chan_info)
126 assert chan_info['data']['type'] == 'float-data', \
127 'Non-float data format:\n%s' % pprint.pformat(chan_info)
128 data = numpy.frombuffer(
130 dtype=numpy.dtype(numpy.float32).newbyteorder('>'))
131 # '>' (big endian) byte order.
132 # From version 0.3 of JPKForceSpec.txt in the "Binary data" section:
133 # All forms of raw data are stored in chronological order
134 # (the order in which they were collected), and the
135 # individual values are stored in network byte order
136 # (big-endian). The data type used to store the data is
137 # specified by the "channel.*.data.type" property, and is
138 # either short (2 bytes per value), integer (4 bytes), or
139 # float (4 bytes, IEEE format).
143 def _zip_translate_params(self, params, chan_info):
146 #'time':self._time_from_TODO(raw_info[]),
148 force_unit = chan_info['channel']['vDeflection']['conversion-set']['conversion']['force']['scaling']['unit']['unit']
149 assert force_unit == 'N', force_unit
150 force_base = chan_info['channel']['vDeflection']['conversion-set']['conversion']['force']['base-calibration-slot']
151 assert force_base == 'distance', force_base
152 dist_unit = chan_info['channel']['vDeflection']['conversion-set']['conversion']['distance']['scaling']['unit']['unit']
153 assert dist_unit == 'm', dist_unit
155 chan_info['channel']['vDeflection']['conversion-set']['conversion']['force']['scaling']['multiplier'])
156 info['spring constant (N/m)'] = force_mult
159 def _zip_translate_segment_params(self, params):
162 'columns':list(params['channels']['list']),
163 'name':params['force-segment-header']['name']['name'],
165 if info['name'] in ['extend-spm', 'retract-spm', 'pause-at-end-spm']:
166 info['name'] = info['name'][:-len('-spm')]
167 if info['name'] == 'extend':
168 info['name'] = 'approach'
170 raise NotImplementedError(
171 'Unrecognized segment type %s' % info['name'])
174 def _zip_scale_segment(self, segment, path, info):
180 segment.info['raw data'] = data
183 channels = segment.info['raw info']['channels']['list']
184 for i,channel in enumerate(channels):
186 if channel == 'vDeflection':
187 conversion = 'distance'
188 segment = self._zip_scale_channel(
189 segment, channel, conversion=conversion, path=path, info=info)
190 name,unit = split_data_label(segment.info['columns'][i])
191 if name == 'vDeflection':
192 assert unit == 'm', segment.info['columns'][i]
193 segment.info['columns'][i] = join_data_label('deflection', 'm')
194 # Invert because deflection voltage increases as the
195 # tip moves away from the surface, but it makes more
196 # sense to me to have it increase as it moves toward
197 # the surface (positive tension on the protein chain).
199 elif name == 'height':
200 assert unit == 'm', segment.info['columns'][i]
201 segment.info['columns'][i] = join_data_label('z piezo', 'm')
204 def _zip_scale_channel(self, segment, channel_name, conversion=None,
206 channel = segment.info['raw info']['channels']['list'].index(
208 conversion_set = segment.info['raw info']['channel'][channel_name]['conversion-set']
209 if conversion == None:
210 conversion = conversion_set['conversions']['default']
211 if conversion == conversion_set['conversions']['base']:
212 # Our conversion is the base data.
213 if conversion != 'volts':
214 raise NotImplementedError(
215 'unknown units for base channel: %s' % conversion)
216 segment.info['columns'][channel] = join_data_label(
219 conversion_info = conversion_set['conversion'][conversion]
220 if conversion_info['base-calibration-slot'] \
221 != conversion_set['conversions']['base']:
222 # Our conversion is stacked on a previous conversion. Do
223 # the previous conversion first.
224 segment = self._zip_scale_channel(
225 segment, channel_name,
226 conversion_info['base-calibration-slot'],
227 path=path, info=info)
228 if conversion_info['type'] == 'file':
229 # Michael Haggerty at JPK points out that the conversion
230 # information stored in the external file is reproduced in
231 # the force curve file. So there is no need to actually
232 # read `conversion_info['file']`. In fact, the data there
233 # may have changed with future calibrations, while the
234 # information stored directly in conversion_info retains
235 # the calibration information as it was when the experiment
237 pass # Fall through to 'simple' conversion processing.
239 assert conversion_info['type'] == 'simple', conversion_info['type']
240 assert conversion_info['scaling']['type'] == 'linear', \
241 conversion_info['scaling']['type']
242 assert conversion_info['scaling']['style'] == 'offsetmultiplier', \
243 conversion_info['scaling']['style']
244 multiplier = float(conversion_info['scaling']['multiplier'])
245 offset = float(conversion_info['scaling']['offset'])
246 unit = conversion_info['scaling']['unit']['unit']
247 segment[:,channel] = segment[:,channel] * multiplier + offset
248 segment.info['columns'][channel] = join_data_label(channel_name, unit)
251 def _parse_params(self, lines):
255 if line.startswith('#'):
258 # e.g.: force-segment-header.type=xy-position-segment-header
259 fields = line.split('=', 1)
260 assert len(fields) == 2, line
261 setting = fields[0].split('.')
262 sub_info = info # drill down, e.g. info['force-s..']['type']
263 for s in setting[:-1]:
264 if s not in sub_info:
266 sub_info = sub_info[s]
267 if setting[-1] == 'list': # split a space-delimited list
268 sub_info[setting[-1]] = fields[1].split(' ')
270 sub_info[setting[-1]] = fields[1]
273 def _read_old(self, path, info):
274 raise NotImplementedError(
275 "Early JPK files (pre-zip) are not supported by Hooke. Please "
276 "use JPK's `out2jpk-force` script to convert your old files "
277 "to a more recent format before loading them with Hooke.")