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MGH_PLAYER__DEFINE

MGH_PLAYER__DEFINE

Class


  MGH_Player

Purpose


  A window for displaying & managing picture sequences.

Category


      Widgets, Object Graphics.

Properties


  The following properties (ie keywords to the Init, GetProperty &
  SetProperty methods) are supported:
    CUMULATIVE (Init, Get, Set)
      The number of frames to superpose on each display. Default is 1.
      If CUMULATIVE is zero or negative then all frames up to the
      current one are superposed.
    N_FRAMES (Get)
      The number of frames currently managed by the animator.
    SLAVE (Init, Get, Set)
      Set this property to specify that the player will be
      controlled externally.
###########################################################################
  Copyright (c) 2001-2012 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 2001-07.
    Written.
  Mark Hadfield 2004-04:
    Several changes to the code that exports animations to
    bitmap-oriented animation formats:
      - Removed facility to save an animation in PPM_SEQUENCE
        form. Image sequences can be created in other ways,
      - Added method WriteAnimationToAVIFile to produce AVI movies
        using the IDL_AVI DLM. See also the new function MGH_AVI_REGISTERED.
  Mark Hadfield 2005-01:
    Fixed bug in WriteAnimationToAVIFile: when USE_RANGE property is set and
    frames are skipped, empty frames are being left in the AVI file.
  Mark Hadfield 2006-05:
    - The WriteAnimationToAVIFile method now uses the MGHaviWriteFile class,
      which provides an interface to Olgeg Kornilov's AVI DLL.
    - The menu item that supports MPEG output has been deleted, as MPEG
      output from the IDLgrMPEG object is pretty awful.
  Mark Hadfield 2007-10:
    - The WriteAnimationToAVIFile method now forces the output buffer size
      to be a multiple of 8 (previously 4) to supprt a wider range of codecs.
  Mark Hadfield 2010-01:
    - When AVI files are written via the EvenMenuBar method, an hourglass is
      now showned and the frames are not displayed. This reduces time taken
      by ~ 40%.
  Mark Hadfield 2010-10:
    - Added menu entries to write a single frame to a PDF file, using the
      MGH_Window object's WritePictureToPDF method, which uses the IDLgrPDF
      class, added in IDL 8.0.
  Mark Hadfield 2010-11:
    - Added WriteAnimationToPDFFile method and corresponding menu entries
      to write the animation to a multi-page PDF files, using the multi-page
      capability of the IDLgrPDF class, added in IDL 8.0.1.
  Mark Hadfield 2011-10:
    - Removed all remaining MPEG-related code.
  Mark Hadfield 2011-11:
    - The player will now export animations in AVI format with a choice of 2
      codecs: MSVC (Win32 only) and MPEG4 (IDL 8.1 on all platforms). A
      QUALITY keyword has been added to WriteAnimationToVideoFile allowing the
      target bit rate to be set as a fraction of the bit rate required to
      render the images in uncompressed form. The default QUALITY is currently
      0.15, which seems to work OK for MPEG4.
    - Removed "Tools/Clipboard Viewer" menu item, as the clipboard viewer is
      not available in recent versions of Windows.
  Mark Hadfield 2012-02:
    - Code in EventMenuBar cleaned up.
  Mark Hadfield 2013-11:
    - Removed support for the AVI DLL and the MSVC codec.
  Mark Hadfield, 2014-09:
    - The resolution for "hi-res" images and image sequences is now
      set by the HIGH_RESOLUTION property inherited from MGH _Window.
      The default value is reduced from 2.54/360 to the MGH_Window default,
      currently 2.54/240.



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