CompositeTransform¶
-
class
astropy.coordinates.
CompositeTransform
(transforms, fromsys, tosys, priority=1, register_graph=None, collapse_static_mats=True)[source] [edit on github]¶ Bases:
astropy.coordinates.CoordinateTransform
A transformation constructed by combining together a series of single-step transformations.
Note that the intermediate frame objects are constructed using any frame attributes in
toframe
orfromframe
that overlap with the intermediate frame (toframe
favored overfromframe
if there’s a conflict). Any frame attributes that are not present use the defaults.Parameters: - transforms : sequence of
CoordinateTransform
objects The sequence of transformations to apply.
- fromsys : class
The coordinate frame class to start from.
- tosys : class
The coordinate frame class to transform into.
- priority : number
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.- collapse_static_mats : bool
If
True
, consecutiveStaticMatrixTransform
will be collapsed into a single transformation to speed up the calculation.
Methods Summary
__call__
(fromcoord, toframe)Does the actual coordinate transformation from the fromsys
class to thetosys
class.Methods Documentation
-
__call__
(fromcoord, toframe)[source] [edit on github]¶ Does the actual coordinate transformation from the
fromsys
class to thetosys
class.Parameters: - fromcoord : fromsys object
An object of class matching
fromsys
that is to be transformed.- toframe : object
An object that has the attributes necessary to fully specify the frame. That is, it must have attributes with names that match the keys of the dictionary that
tosys.get_frame_attr_names()
returns. Typically this is of classtosys
, but it might be some other class as long as it has the appropriate attributes.
Returns: - tocoord : tosys object
The new coordinate after the transform has been applied.
- transforms : sequence of