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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 AST_INVERT), 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.



next up previous
Next: AST Class Descriptions
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Previous: Width(element) - Line width for a Plot element

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