from .afm_data import AFMData
from .afm_segment import AFMSegment
__all__ = ["AFMForceDistance"]
[docs]class AFMForceDistance(AFMData):
"""Base class for AFM force-distance data
A force-distance dataset consists of an approach and
a retract curve.
"""
def __init__(self, *args, **kwargs):
super(AFMForceDistance, self).__init__(*args, **kwargs)
#: Dictionary-like interface to the approach segment
self.appr = AFMSegment(self._raw_data, self._data, segment=0)
#: Dictionary-like interface to the retract segment
self.retr = AFMSegment(self._raw_data, self._data, segment=1)
def __setitem__(self, key, value):
super(AFMForceDistance, self).__setitem__(key, value)
if key == "segment":
# The user changed the segment, which means we have to clear
# the segment cache.
self.appr.clear_cache()
self.retr.clear_cache()
@property
def modality(self):
"""Imaging modality"""
return "force-distance"