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ZoomMap - Zoom coordinates about the origin

Description:
The ZoomMap class implements a Mapping which performs a "zoom" transformation by multiplying all coordinate values by the same scale factor (the inverse transformation is performed by dividing by this scale factor). The number of coordinate values representing each point is unchanged.
Constructor Function:
astZoomMap
Inheritance
The ZoomMap class inherits from the Mapping class.
Attributes
In addition to those attributes common to all Mappings, every ZoomMap also has the following attributes:

  • Zoom: ZoomMap scale factor
Functions
The ZoomMap class does not define any new functions beyond those which are applicable to all Mappings.



next up previous 264
Next: UNIX Command 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
24th May 2011
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2009 Science \& Technology Facilities Council