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Zoom - ZoomMap scale factor

Description:
This attribute holds the ZoomMap scale factor, by which coordinate values are multiplied (by the forward transformation) or divided (by the inverse transformation). This factor is set when a ZoomMap is created, but may later be modified. The default value is unity.

Note that if a ZoomMap is inverted (e.g. by using astInvert), then the reciprocal of this zoom factor will, in effect, be used.

Type:
Double precision.
Class Applicability:
ZoomMap
All ZoomMaps have this attribute.
Notes:
  • The Zoom attribute may not be set to zero.



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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