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MGHGRGRAPH2D__DEFINE

MGHGRGRAPH2D__DEFINE

Class Name


  MGHgrGraph2D

Purpose


  This class implements a 2D graph with a plot area and space for
  axes & annotations. It includes several methods for adding axes,
  plots, and other graphics atoms & models. Most of this
  functionality is inherited from the superclass, MGHgrGraph, but
  the MGHgrGraph2D knows where to put its X & Y axes and how to
  scale them.

Category


  Object graphics.

Superclasses


  MGHgrGraph.

Properties


  The following properties (ie keywords to the Init, GetProperty &
  SetProperty methods) are supported in addition to those inherited
  from MGHgrGraph:
    ALL (Get)
      This property wraps the object's other properties in a structure.
    ASPECT (Init)
      A floating point number specifying the ratio between height and
      width of the plot rectangle (ie. PLOT_RECT[3]/PLOT_RECT[2]). It
      is used only if PLOT_RECT is not specified.
    PLOT_RECT (Init, Get, Set)
      This is a 4-element vector, similar in layout to
      VIEWPLANE_RECT, specifying the location and dimensions in
      normalised coordinates of the "plot rectangle". By default
      axes and plots are drawn around, and plots in, the plot
      rectangle.
    XMARGIN, YMARGIN (Init, Get, Set)
      2-element vectors specifying the width, in normalised
      coordinates, of the margins between the plot and viewplane
      rectanges. Defaults are XMARGIN = [0.375,0.15] and YMARGIN =
      [0.30,0.225].

Methods


  (under construction)
###########################################################################
  Copyright (c) 2000-2012 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, 2000-08:
    - Replaced existing classes MGHgrView, MGHgrGraph,
      MGHgrFixedGraph & MGHgrGraph3D with MGHgrGraph (similar to the
      old MGHgrView), MGHgrGraph2D (merges the old MGHgrGraph &
      MGHgrFixedGraph) and MGHgrGraph3D (similar to the old class of
      the same name but much of the logic has been moved to the
      superclass MGHgrGraph).
    - Moved auto-scaling of DIMENSIONS based on VIEWPLANE_RECT to
      MGHgrGraph.
    - XMARGIN and YMARGIN are no longer stored in the class
      structure but are calculated as needed from VIEWPLANE_RECT and
      PLOT_RECT.
    - Removed the NewText method from this class (which therefore
      now inherits MGHgrGraph::NewText unchanged). The functionality
      previously provided by the TITLE keyword to NewText is now in
      a separate method called NewTitle. The NewTitle method
      requires its "text class" to have an interface very similar to
      IDLgrText, whereas the NewText method can be used with any
      graphics atom class that supports a FONT property and takes up
      to 1 positional parameter in its Init method.
    - Added REVERSE keyword to NewAxis to support creation of
      reverse-direction axes. Doesn't work properly for axis titles,
      or for Z axes because of a bug in IDL 5.4 beta.
    - The NewBackground method now creates an MGHgrBackground, which
      has some properties that make it espacially suitable for this role.
  Mark Hadfield, 2001-11:
    - Updated for IDL 5.5.
    - Added support for ALL property.
  Mark Hadfield, 2008-08:
    - The NewColorBar method now calls the method of the same name
      from the superclass, MGHgrGraph, and has been simplified
      accordingly.
  Mark Hadfield, 2011-08:
    - Added the TICK_ORIENTATION property.



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