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MGHGRBACKGROUND__DEFINE

MGHGRBACKGROUND__DEFINE

Class Name


  MGHgrBackground

Purpose


  This class is just an IDLgrPolygon with a couple of changes that
  make it suitable to be the background (selection target) in an
  MGHgrGraph:
    - The GetProperty keywords XRANGE, YRANGE and ZRANGE return
      undefined values. This means that the background object is
      ignored when fitting axes around atoms.
    - The DEPTH_WRITE_DISABLE property is set to 1 to allow this
      pbject to be overdrawn.
    - If the SetProperty keywords XCOORD_CONV, YCOORD_CONV or
      ZCOORD_CONV are invoked (and the DATA keyword is not) then the
      DATA array is adjusted to maintain a constant position in
      normalised coordinates.
###########################################################################
  This software is provided subject to the following conditions:
  1. NIWA makes no representations or warranties regarding the
    accuracy of the software, the use to which the software may
    be put or the results to be obtained from the use of the
    software. Accordingly NIWA accepts no liability for any loss
    or damage (whether direct of indirect) incurred by any person
    through the use of or reliance on the software.
  2. NIWA is to be acknowledged as the original author of the
    software where the software is used or presented in any form.
###########################################################################

Modification History


  Mark Hadfield, 2000-08:
    Written.
  Mark Hadfield, 2003-06:
    Updated for IDL 6.0: Init method added, setting the default value of
    DEPTH_WRITE_DISABLE to 1.



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