AffineTransform¶
- class astropy.coordinates.AffineTransform(transform_func, fromsys, tosys, priority=1, register_graph=None)[source]¶
Bases:
BaseAffineTransform
A coordinate transformation specified as a function that yields a 3 x 3 cartesian transformation matrix and a tuple of displacement vectors.
See
Galactocentric
for an example.- Parameters:
- transform_func
callable()
A callable that has the signature
transform_func(fromcoord, toframe)
and returns: a (3, 3) matrix that operates onfromcoord
in a Cartesian representation, and aCartesianRepresentation
with (optionally) an attached velocityCartesianDifferential
to represent a translation and offset in velocity to apply after the matrix operation.- fromsysclass
The coordinate frame class to start from.
- tosysclass
The coordinate frame class to transform into.
- priority
float
orint
The priority if this transform when finding the shortest coordinate transform path - large numbers are lower priorities.
- register_graph
TransformGraph
orNone
A graph to register this transformation with on creation, or
None
to leave it unregistered.
- transform_func
- Raises:
TypeError
If
transform_func
is not callable