Re: [Gnuplot-info] C++ interface to gnuplot

[Lee D. <le...@ea...>]

Hans-Bernhard Bröker wrote:
> Lee Duke wrote:
>> I'm trying to access gnuplot from within C++. I'd like to be able to 
>> pass standard commands to the gnuplot interface and get plots that I 
>> can either view, save to a file, or print. Is there a reasonably easy 
>> and painless way to do this in some platform-independent way?
>
> There cannot be a truly platform-independent way of doing that, 
> because platform dependence sets in before you can even run an 
> external program, much less redirect its inputs or outputs.
>
> As portable as it gets is what N. Devilla's C interfacing library 
> supports.  That should be usable from C++, too.
>
Thanks, Hans.

Actually, I found what I was looking for "plplot-config"

Using that I can set up my configure.in file:

    PLPLOTCONFIG=plplot-config
    AC_ARG_WITH(plplot-config,
    [[  --with-plplot-config=""    Use the given path to plplot-config
    when determining
                                   plplot  configuration; defaults to
    "plplot-config"]],
    [
        if test "$withval" != "yes" -a "$withval" != ""; then
            PLPLOTCONFIG=$withval
        fi
    ])

    plplotversion=0

    AC_DEFUN([PLPLOTTEST],
    [
        AC_REQUIRE([AC_PROG_AWK])
        AC_MSG_CHECKING([plplot  version])
        if plplotversion=`$PLPLOTCONFIG --version`; then
            AC_MSG_RESULT([$plplotversion])
        else
            AC_MSG_RESULT([not found])
            AC_MSG_ERROR([plplot  is required. Try --with-plplot-config.])
        fi])

    # Call PLPLOTTEST func
    PLPLOTTEST

    # Verify minimus requires
    vers=`echo $plplotversion | $AWK 'BEGIN { FS = "."; } { printf "%
    d", ($1 * 1000 + $2) * 1000 + $3;}'`
    if test -n "$vers" && test "$vers" -ge 5006001; then
        PLPLOT_CPPFLAGS="`$PLPLOTCONFIG --cflags`"
        PLPLOT_CXXFLAGS="`$PLPLOTCONFIG --cflags`"
        PLPLOT_LIBS="`$PLPLOTCONFIG --libs --with-c++`"
    else
        AC_MSG_ERROR([plplot  5.6.1 or newer is required])
    fi

    AC_SUBST(PLPLOT_LIBS)

    CPPFLAGS="$CPPFLAGS   $PLPLOT_CPPFLAGS"
    CXXFLAGS="$CXXFLAGS $PLPLOT_CXXFLAGS"

Then in my "Makefile.am" file I add:

    myprogramname_LDDFLAGS = $(PLPLOT_LIBS)

And then I have a platform independent configuration. After running
    autoscan
    aclocal
    automake
    autoconf
    ./configure
    make

I am in business.