next up previous
Next: UNIX Command Descriptions
Up: AST Class Descriptions
Previous: WinMap - Map one window on to another by scaling and shifting each axis

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
Next: UNIX Command Descriptions
Up: AST Class Descriptions
Previous: WinMap - Map one window on to another by scaling and shifting each axis

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