Re: [Gnuplot-info] png terminal will not print different font size except for the default

[Jon <dev...@gm...>]

Thank you very much for your information. But I cannot catch the main idea
there. I am not familiar with libgd or fontconfig at all. Could you please
give a more detailed explanation and guide me more closely? I showed
version long and it returned the following, maybe it helps you to identify
the issue for me.

        G N U P L O T
        Version 4.2 patchlevel 6
        last modified Sep 2009
        System: Linux 2.6.32-220.el6.x86_64

        Copyright (C) 1986 - 1993, 1998, 2004, 2007 - 2009
        Thomas Williams, Colin Kelley and many others

        Type `help` to access the on-line reference manual.
        The gnuplot FAQ is available from http://www.gnuplot.info/faq/

        Send bug reports and suggestions to <
http://sourceforge.net/projects/gnuplot>

Compile options:
-READLINE  +LIBREADLINE  +HISTORY  +BACKWARDS_COMPATIBILITY  +BINARY_DATA
+GD_PNG  +GD_JPEG  +GD_TTF  +GD_GIF  +ANIMATION
-NOCWDRC  +X11  +X11_POLYGON  +MULTIBYTE  +USE_MOUSE  +HIDDEN3D_QUADTREE
+DATASTRINGS  +HISTOGRAMS  +OBJECTS  +STRINGVARS  +MACROS  +IMAGE

DRIVER_DIR     = "/usr/libexec/gnuplot/4.2"
GNUPLOT_PS_DIR = "/usr/share/gnuplot/4.2/PostScript"
HELPFILE       = "/usr/share/gnuplot/4.2/gnuplot.gih"




On Thu, Apr 16, 2015 at 6:11 PM, Ethan Merritt <eam...@gm...> wrote:

> On Thu, Apr 16, 2015 at 3:05 PM, Jon <dev...@gm...> wrote:
> > could you please give me your configure file relevant to gnuplot?
> >
> > What I am using are copied from online as
> >
> > export GDFONTPATH=/usr/share/fonts/liberation
> > export GNUPLOT_DEFAULT_GDFONT=LiberationSans-Regular
> >
> > which does exist under the specific directory but obviously not perfect.
> How
> > to check whether these are compatible with my current version of gnuplot?
> >
> > Thanks,
> >
> >
> >
> > On Thu, Apr 16, 2015 at 4:18 PM, Ethan Merritt <eam...@gm...>
> wrote:
> >>
> >> I do not know why/how your system is [mis]configured so that it does
> >> not find fonts by default, but you can use the environmental variable
> >> GDFONTPATH to give libgd a new list of directories to use for font
> >> lookup.  Of course it will only find fonts that are actually present
> >> in those directories.
>
> I don't think the gnuplot version is relevant here.  The only thing
> that matters is libgd.
>
> I think that all versions of libgd will accept a font by path and
> filename (as you show in your export commands above).  libgd versions
> newer than (I think) 2.0.35 will also accept a font specified by its
> face name, in which case the system fontconfig utility is used to
> search for it. In either case gnuplot just passes through the
> requested font name and size to libgd; it doesn't do any font
> management by itself.
>
> It is in principle possible to have a copy of libgd that doesn't
> support TrueType or OpenType fonts, but I haven't seen such a thing
> since last century.   This is tested at the time gnuplot is configured
> and the result is indicated by defining (or not) the symbol
> HAVE_GD_TTF in file config.h.  You can also check this from inside
> gnuplot by typing "show version long" and looking for the string
> "+GD_TTF".
>