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MGHGRBARB__DEFINE

MGHGRBARB__DEFINE

Name


  MGHgrBarb

Purpose


  This class implements a set of wind/current barbs by joining up the
  appropriate vertices in a single IDLgrPolyline.

Category


  Object graphics.

Superclass


  IDLgrModel

Properties


  Properties not recognised by this class are passed to the barb
  object (an IDLgrPolyline). The following properties are supported
  directly
    BARB_COLORS (Init)
      A vector of indexed or RGB colours (ie an [n] or [3,n] byte
      array) specifying the colour of each barb.
    DATAU, DATAV, DATAW (Init)
      These specify the displacement of the tip of each barb from
      its base in the x, y & z directions respectively. Optional,
      default = 0.
    DATAX, DATAY, DATAZ (Init)
      Each of these is a scalar or vector specifying the location
      of the base of each barb. Optional, default = 0.
    NORM_SCALE (Init, Get, Set)
      A 3-element boolean vector specifying how the SCALE property is to
      be interpreted for each direction. If NORM_SCALE is true for a
      given direction, then the corresponding SCALE is interpreted
      as a length in normalised coordinates, otherwise it is
      interpreted as a length in data coordinates (the same ones as used
      for DATA[X,Y,Z]).
    SCALE (Init, Get, Set)
      A 3-element double-precision vector specifying the length of a
      unit velocity vector. This property can be (and often will be)
      passed to Init or GetProperty as a scalar. Default is [1,1,1].

To Do


  - Direct appropriate keywords (e.g. HIDE) to the model rather than
    the atom.
  - Separate colour recalculation from dimension recalculation--you don't
    really need to recalculate all the dimensions when the colour is changed.
  - Sort out arrow head shape for anisotropic data coordinates.
###########################################################################
  Copyright (c) 2013 NIWA:
  http://www.niwa.co.nz/
  Licensed under the MIT open source license:
  http://www.opensource.org/licenses/mit-license.php
###########################################################################

Modification History


  Mark Hadfield, 1998-02:
    Written as MGHgrBarb.
  Mark Hadfield, 1999-05:
    Added DATAZ & BARB_COLORS.
  Mark Hadfield, 2000-07:
    Substantially rewritten. The meaning of the SCALE keyword has
    changed so that it is more logical and extensible to the Z
    dimension--this is NOT BACKWARD-COMPATIBLE. Changed from a
    subclass of IDLgrPolyline to a subclass of IDLgrModel (with
    SELECT_TARGET set) in preparation for supporting symbols. Added
    DATAW property for full 3D support.
  Mark Hadfield, 2001-07:
    Updated for IDL 5.5.
  Mark Hadfield, 2004-07:
    - Renamed MGHgrBarb.
    - Handling of scaling changed: the default is now to scale in data
      coordinates and the NORM_SCALE keyword has been added to support
      the original normalised scaling.
  Mark Hadfield, 2007-09:
    - Fixed bug: single precision calculations used in CalculateDimensions
      methods when the object's DOUBLE property is set.
    - Changed default value of DOUBLE property to 1.
  Mark Hadfield, 2013-10:
    - Implemented arrow heads.



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