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astInvert - Invert a Mapping   

Description:
This function inverts a Mapping by reversing the boolean sense of its Invert attribute. If this attribute is zero (the default), the Mapping will transform coordinates in the way specified when it was created. If it is non-zero, the input and output coordinates will be inter-changed so that the direction of the Mapping is reversed. This will cause it to display the inverse of its original behaviour.

Synopsis:
void astInvert( AstMapping *this )

Parameters:
this
Pointer to the Mapping.



next up previous
Next: astIsA<Class> - Test membership of a class by an Object
Up: AST Function Descriptions
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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