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  The purpose of cgDisplay is to open a graphics window on the display, or in the
  PostScript device, or in the Z-graphics buffer, depending upon the current graphics
  device. In PostScript a window of the proper aspect ratio is created with PSWindow.
  Using cgDisplay to open "windows" will allow you to more easily write device-independent
  IDL programs.




    pxsize: in, optional, type=integer, default=640
        The X size of the graphics window created. By default, 640.
    pysize: in, optional, type=integer, default=512
        The Y size of the graphics window created. By default, 512.


    aspect, in, optional, type=float
        Set this keyword to create a window with this aspect ratio (ysize/xsize).
        If aspect is greater than 1, then the ysize will be used in the aspect
        ratio calculation. If the aspect is less than or equal to 1, then the
        xsize will be used in the aspect ratio calculation of the final window size.
        If the input to the ASPECT keyword is an image, then the aspect ratio will
        be calculated from the image itself.
    color: in, optional, type=string/integer, default='white'
        If this keyword is a string, the name of the data color. By default, 'white'.
        Color names are those used with cgColor. Otherwise, the keyword is assumed
        to be a color index into the current color table. The color is not used if
        the "window" is opened in PostScript on the Z-graphics buffer.
    force: in, optional, type=boolean, default=0
        Because of the way cgDisplay is designed to work in many devices and in resizeable
        graphics windows, it is sometimes the case that it won't create a window for you.
        If you set this keyword, a graphics window will be created while in any device that
        supports graphics windows.
    free: in, optional, type=boolean, default=0
        Set this keyword to open a window with a free or unused window index number.
        This keyword applied only to graphics windows created on the computer display.
    match: in, optional, type=boolean, default=0
        If this keyword is set, the new display window will match the size of the current
        display window, if there is one.
    wid: in, optional, type=integer, default=0
        The window index number of the IDL graphics window to create.
    window: in, optional, type=integer, default=0
        Because I want to use cgDisplay everywhere, including in resizeable graphics
        windows, and I don't want it opening windows then, it first checks to be sure
        there are no resizeable graphics windows on the display before it creates a window.
        Setting this keyword will overrule this check and create a normal IDL graphics window
        on the display. This will allow you to open a normal graphics window at the same
        time a resizeable graphics window exists on the display.
    xsize: in, optional, type=integer, default=640
        The X size of the graphics window created. By default, 640. The PXSIZE parameter
        is used in preference to the XSIZE keyword value.
    ysize: in, optional, type=integer, default=512
        The Y size of the graphics window created. By default, 512. The PYSIZE parameter
        is used in preference to the YSIZE keyword value.
    _extra: in, optional, type=any
        Any keywords supported by the WINDOW command are allowed.


    Use like the IDL WINDOW command::
      IDL> cgDisplay, XSIZE=500 YSIZE=400
      IDL> cgDisplay, 500, 500, WID=1, COLOR='gray'


          David W. Fanning
          1645 Sheely Drive
          Fort Collins, CO 80526 USA
          Phone: 970-221-0438
          E-mail: david@idlcoyote.com
          Coyote's Guide to IDL Programming: http://www.idlcoyote.com


    Change History::
        Written, 15 November 2010. DWF.
        Changes so that color variables don't change type. 23 Nov 2010. DWF.
        Moved the window index argument to the WID keyword. 9 Dec 2010. DWF.
        Modified to produce a window in PostScript and the Z-buffer, too. 15 Dec 2010. DWF.
        Added the FREE keyword. 3 January 2011. DWF.
        I made a change that allows you to call cgDisplay inside a program that is
          going to be added to a cgWindow. The program will not open a graphics window
          if the current graphics window ID is found in a list of cgWindow window IDs.
          It is now possible to use cgDisplay in any graphics program, even those that
          will be run in cgWindow. 17 Nov 2011. DWF.
        Added ASPECT keyword. 18 Nov 2011. DWF.
        Allowed the window ASPECT to be set with an image argument. 25 Nov 2011. DWF.
        Now use Scope_Level to always create a display when cgDisplay is called from
          the main IDL level. 7 Feb 2012. DWF.
        Added FORCE and MATCH keywords. 16 Feb 2012. DWF.


    Copyright (c) 2010-2012, Fanning Software Consulting, Inc.

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