1 # Copyright (C) 2010 W. Trevor King <wking@drexel.edu>
3 # This file is part of Hooke.
5 # Hooke is free software: you can redistribute it and/or
6 # modify it under the terms of the GNU Lesser General Public
7 # License as published by the Free Software Foundation, either
8 # version 3 of the License, or (at your option) any later version.
10 # Hooke is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU Lesser General Public License for more details.
15 # You should have received a copy of the GNU Lesser General Public
16 # License along with Hooke. If not, see
17 # <http://www.gnu.org/licenses/>.
19 """The `curve` module provides :class:`Curve` and :class:`Data` for
27 class NotRecognized (ValueError):
28 def __init__(self, curve):
29 self.__setstate__(curve)
31 def __getstate__(self):
34 def __setstate__(self, data):
35 if isinstance(data, Curve):
36 msg = 'Not a recognizable curve format: %s' % data.path
37 super(NotRecognized, self).__init__(msg)
40 class Data (numpy.ndarray):
41 """Stores a single, continuous data set.
43 Adds :attr:`info` :class:`dict` to the standard :class:`numpy.ndarray`.
45 See :mod:`numpy.doc.subclassing` for the peculiarities of
46 subclassing :class:`numpy.ndarray`.
48 def __new__(self, subtype, shape, dtype=numpy.float, buffer=None, offset=0,
49 strides=None, order=None, info=None):
50 """Create the ndarray instance of our type, given the usual
51 input arguments. This will call the standard ndarray
52 constructor, but return an object of our type.
54 obj = np.ndarray.__new__(subtype=subtype, shape=shape, dtype=dtype,
55 buffer=buffer, offset=offset, strides=strides,
57 # add the new attribute to the created instance
61 # Finally, we must return the newly created object:
64 def __array_finalize__(self, obj):
65 """Set any extra attributes from the original object when
66 creating a new view object."""
67 # reset the attribute from passed original object
68 self.info = getattr(obj, 'info', {})
69 # We do not need to return anything
73 """A grouped set of :class:`Data` runs from the same file with metadata.
75 For an approach/retract force spectroscopy experiment, the group
76 would consist of the approach data and the retract data. Metadata
77 would be the temperature, cantilever spring constant, etc.
79 Two important :attr:`info` settings are `filetype` and
80 `experiment`. These are two strings that can be used by Hooke
81 commands/plugins to understand what they are looking at.
83 * `.info['filetype']` should contain the name of the exact
84 filetype defined by the driver (so that filetype-speciofic
85 commands can know if they're dealing with the correct filetype).
86 * `.info['experiment']` should contain an instance of a
87 :class:`hooke.experiment.Experiment` subclass to identify the
88 experiment type. For example, various
89 :class:`hooke.driver.Driver`\s can read in force-clamp data, but
90 Hooke commands could like to know if they're looking at force
91 clamp data, regardless of their origin.
93 def __init__(self, path, info=None):
94 #the data dictionary contains: {name of data: list of data sets [{[x], [y]}]
101 self.name = os.path.basename(path)
103 def identify(self, drivers):
104 """Identify the appropriate :class:`hooke.driver.Driver` for
105 the curve file (`.path`).
107 for driver in drivers:
108 if driver.is_me(self.path):
109 self.driver = driver # remember the working driver
111 raise NotRecognized(self)
114 """Use the driver to read the curve into memory.
116 data,info = self.driver.read(self.path)
118 for key,value in info.items():
119 self.info[key] = value
122 """Release memory intensive :attr:`.data`.