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

[Ethan M. <eam...@gm...>]

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".