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1.1     ! maekawa     1: GNUPLOT 3.3 for OS/2 v 2.0
        !             2: ==========================
        !             3:
        !             4: 1) Introduction
        !             5: ===============
        !             6:
        !             7: This file discusses the version of GNUPLOT 3.3 implemented for OS/2 2.0.
        !             8:
        !             9: The command line interface of GNUPLOT is retained, while graphics output is
        !            10: plotted in a Presentation Manager Window. The GNUPLOT command line
        !            11: appears in another text-mode window on the screen.
        !            12:
        !            13: The PM window has facilities for printing the plot on the default printer,
        !            14: for changing the fonts used on the plot, and for switching between different
        !            15: ways of plotting the lines (with colour, as dot/dashed lines, or both).
        !            16:
        !            17: The command line window offers the usual GNUPLOT interface. Both Unix-style
        !            18: and DOS-style editing keys are supported.
        !            19:
        !            20: The GNUPLOT program was compiled with the emx version of the GNU compiler.
        !            21: It supports the shell command (type 'exit' to return to GNUPLOT), can pipe
        !            22: datafiles through external commands using '<', and supports command-line
        !            23: substitution. It runs the full set of demonstration programs supplied in
        !            24: the GNUPLOT source code distribution without problems.
        !            25:
        !            26: The GNUPLOT 3.3 port to OS/2 differs slightly from the 3.2 port, in that
        !            27: the PM driver is started from GNUPLOT, rather than the other way round.
        !            28: This means that the program name will have to be changed in the program
        !            29: object that runs GNUPLOT, if you install 3.3 over 3.2.
        !            30: This change does however make the GNUPLOT command line accessible to programs
        !            31: that pipe commands to GNUPLOT.
        !            32:
        !            33:
        !            34: 2) Running GNUPLOT
        !            35: ==================
        !            36:
        !            37: GNUPLOT can be run from the command line of an OS/2 session (preferrably
        !            38: a windowed command session, so that the command line and the displayed
        !            39: graph can be viewed at the same time), or can be set up as a program object
        !            40: in the WPS.
        !            41:
        !            42: GNUPLOT starts up as a command line session which accepts the usual
        !            43: GNUPLOT input. The Presentation Manager window for graphics display
        !            44: is only opened when the first 'plot' or 'splot' command is entered.
        !            45:
        !            46: If GNUPLOT is set up as a program object, it can be configured for
        !            47: 'drag and drop' in the usual way, by specifying '%*' as the program
        !            48: parameter.
        !            49:
        !            50: The PM window has facilities for printing the plot, for changing
        !            51: the fonts used in the plot, and so on. These of course are handled
        !            52: through the usual PM interface.
        !            53: In addition, you can 'drop' a font onto the window to change the font.
        !            54:
        !            55: The usual GNUPLOT commands can also be used to produce output on
        !            56: supported devices.
        !            57:
        !            58: Settings and the positions and sizes of the windows can be saved in
        !            59: the file gnushell.ini. This file is saved in the program's working
        !            60: directory; several different directories can be set up (as program
        !            61: objects) with different options, if you wish.
        !            62:
        !            63: GNUPLOT can be run with the PM display window maximised: clicking on
        !            64: the 'GNUPLOT' menu item (or pressing 'ESC') will bring the GNUPLOT
        !            65: window to the foreground; it will disappear again when plotting begins.
        !            66:
        !            67: GNUPLOT itself communicates with the PM display window (which is a
        !            68: separate program) through a named pipe. Plotting commands are sent to
        !            69: the PM window which produces the plot when all commands have been received.
        !            70:
        !            71: 3) The port of GNUPLOT to OS/2
        !            72: ==============================
        !            73:
        !            74: Changes to the code have been kept minimal. Besides the obvious addition
        !            75: of the PM driver code, the following are the major changes:
        !            76:
        !            77: 1) Addition of code in readline.c to map keypad keys to editing functions,
        !            78:    to duplicate the MS-DOS mode of editing the command line. (See GNUPLOT manual,
        !            79:    page 2.)
        !            80:
        !            81: The rest of the changes are associated with defining the use of the OS2
        !            82: conditional value, and setting system-dependent stuff like names, signal
        !            83: handling, and end-of-line handling (LF vs CR+LF).
        !            84:
        !            85: See the file patches.os2 for changes to the GNUPLOT source.
        !            86:
        !            87: 4) gnupmdrv.exe
        !            88: ===============
        !            89:
        !            90: Gnupmdrv.exe is the 'outboard' driver for GNUPLOT. It is a multithreaded
        !            91: PM program.
        !            92:
        !            93: Roger Fearick
        !            94: fearick@physci.uct.ac.za
        !            95: 5 November 1992