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 _getpixel_w()           Get a pixel value (window coords)

 #include   <graph.h>

 short _getpixel_w(wx, wy);
  double wx, wy;        Window coordinates of the pixel

    _getpixel_w() is the window coordinates version of _getpixel();
    it gets the pixel value at coordinates (wx, wy). See _getpixel()
    for more information.

    Portability:     MS-DOS only, true MDPA, CGA, EGA, MCGA, or VGA video
                     compatibles

    Returns:         The current color index of the pixel if
                     successful; -1 otherwise.