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Negated - Region negation flag

Description:
This attribute controls whether a Region represents the "inside" or the "outside" of the area which was supplied when the Region was created. If the attribute value is zero (the default), the Region represents the inside of the original area. However, if it is non-zero, it represents the outside of the original area. The value of this attribute may be toggled using the astNegate function.

Note, whether the boundary is considered to be inside the Region or not is controlled by the Closed attribute. Changing the value of the Negated attribute does not change the value of the Closed attribute. Thus, if Region is closed, then the boundary of the Region will be inside the Region, whatever the setting of the Negated attribute.

Type:
Integer (boolean).
Class Applicability:
Region
All Regions have this attribute.


next up previous 264
Next: Nframe - Number of Frames in a FrameSet
Up: AST Attribute Descriptions
Previous: NegLon - Display negative longitude values?

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