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7ffff7d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | # Licensed under a 3-clause BSD style license - see LICENSE.rst
__all__ = ['BaseTransform', 'CompositeTransform']
class BaseTransform:
"""
A transformation object.
This is used to construct transformations such as scaling, stretching, and
so on.
"""
def __add__(self, other):
return CompositeTransform(other, self)
class CompositeTransform(BaseTransform):
"""
A combination of two transforms.
Parameters
----------
transform_1 : :class:`astropy.visualization.BaseTransform`
The first transform to apply.
transform_2 : :class:`astropy.visualization.BaseTransform`
The second transform to apply.
"""
def __init__(self, transform_1, transform_2):
super().__init__()
self.transform_1 = transform_1
self.transform_2 = transform_2
def __call__(self, values, clip=True):
return self.transform_2(self.transform_1(values, clip=clip), clip=clip)
@property
def inverse(self):
return self.__class__(self.transform_2.inverse,
self.transform_1.inverse)
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