Source code for astropy.visualization.transform

# Licensed under a 3-clause BSD style license - see LICENSE.rst


__all__ = ['BaseTransform', 'CompositeTransform']


[docs]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)
[docs]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
[docs] 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)