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Changes Introduced in V1.8-2

The following describes the most significant changes which have occurred in the AST library between versions V1.7 and V1.8-2:

1.
The SkyFrame class has a new attribute called NegLon which allows longitude values to be displayed in the range $-\pi$ to $+\pi$, instead of the usual range zero to $2.\pi$.

2.
Some new routines (AST_ANGLE, AST_AXANGLE, AST_RESOLVE, AST_OFFSET2, AST_AXOFFSET, AST_AXDISTANCE) have been added to the Frame class to allow navigation of the coordinate space to be performed without needing to know the underlying geometry of the co-ordinate system (for instance, whether it is Cartesian or spherical).

Note, version 1.8-1 contained many of these facilities, but some have been changed in version 1.8-2. Particularly, positions angles are now referred to the second Frame axis for all classes of Frames (including SkyFrames), and the AST_BEAR routine has been replaced by AST_AXANGLE.



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Next: Changes Introduced in V1.8-3
Up: Changes and New Features
Previous: Changes Introduced in V1.7

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
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