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  This is a utility routine to calculate the scaling vector required to position a
  graphics primitive of specified range at a specific position in an arbitray coordinate
  system. The scaling vector is given as a two-element array like this::
    scalingVector = [translationFactor, scalingFactor]
  The scaling vector should be used with the [XYZ]COORD_CONV keywords of a graphics object
  or model. For example, if you wanted to scale an X axis into the coordinate range of
  -0.5 to 0.5, you might type something like this::
    xAxis->GetProperty, Range=xRange
    xScale = cgNormalize(xRange, Position=[-0.5, 0.5])
    xAxis, XCoord_Conv=xScale


    Graphics Utility


    range: in, required
      A two-element vector specifying the data range.


    position: in, optional, type=float
      A two-element vector specifying the location in the coordinate system you
      are scaling into. The vector [0.0,1.0] is used by default if Position is not


    Here is how to use this program::
      xAxis->GetProperty, Range=xRange
      xScale = cgNormalize(xRange, Position=[-0.5, 0.5])
      xAxis, XCoord_Conv=xScale


      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 by: David W. Fanning, OCT 1997.
      Fixed a problem with illegal divide by zero. 21 April 2005. DWF.
      Fixed a problem when range[0] is greater than range[1]. 11 July 2006. DWF.
      Renamed to FSC_Normalize to avoid conflicts with 10,000 other programs named NORMALIZE. 17 October 2008. DWF.
      Renamed to cgNormalize 6 February 2013. DWF.
      The number I chose (1e-12) to fix the illegal divide by zero problem was too large. I'm now using
          1d-25 instead. 9 September 2013. DWF.


    Copyright (c)1997-2013, Fanning Software Consulting, Inc.

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