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CmpMap - Compound Mapping   

Description:
A CmpMap is a compound Mapping which allows two component Mappings (of any class) to be connected together to form a more complex Mapping. This connection may either be "in series" (where the first Mapping is used to transform the coordinates of each point and the second mapping is then applied to the result), or "in parallel" (where one Mapping transforms the earlier coordinates for each point and the second Mapping simultaneously transforms the later coordinates).

Since a CmpMap is itself a Mapping, it can be used as a component in forming further CmpMaps. Mappings of arbitrary complexity may be built from simple individual Mappings in this way.

Constructor Function:
astCmpMap

Inheritance
The CmpMap class inherits from the Mapping class.

Attributes
The CmpMap class does not define any new attributes beyond those which are applicable to all Mappings.

Functions
The CmpMap class does not define any new functions beyond those which are applicable to all Mappings.



next up previous
Next: DssMap - Map points using a Digitised Sky Survey plate solution
Up: AST Class Descriptions
Previous: CmpFrame - Compound Frame

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 211
R.F. Warren-Smith & D.S. Berry
30th April 2003
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2003 Central Laboratory of the Research Councils