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ClipOp - Combine Plot clipping limits using a boolean OR?

Description:
This attribute controls how the clipping limits specified for each axis of a Plot (using the astClip function) are combined. This, in turn, determines which parts of the graphical output will be visible.

If the ClipOp attribute of a Plot is zero (the default), graphical output is visible only if it satisfies the clipping limits on all the axes of the clipping Frame (a boolean AND). Otherwise, if ClipOp is non-zero, output is visible if it satisfies the clipping limits on one or more axes (a boolean OR).

An important use of this attribute is to allow areas of a Plot to be left clear (e.g. as a background for some text). To achieve this, the lower and upper clipping bounds supplied to astClip should be reversed, and the ClipOp attribute of the Plot should be set to a non-zero value.

Type:
Integer (boolean).

Class Applicability:
Plot
All Plots have this attribute.



next up previous
Next: Colour(element) - Colour index for a Plot element
Up: AST Attribute Descriptions
Previous: Clean - Remove cards used whilst reading even if an error occurs?

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