Re: Usage of "{}" as default fontname for gnuplot

[Ben Abbott]

On Feb 17, 2011, at 3:18 AM, Benjamin Lindner wrote:

>> Please see the bug report of why this change was made
>> 
>> https://savannah.gnu.org/bugs/index.php?32118
>> 
>> No I didn't test under windows, so didn't see this issue. However making
>> the change you suggest will make the issue with the TeX interpreter
>> under gnuplot come back
> 
> I can't quite follow the reasoning in the bug report, nor can I
> reproduce the problem - perhaps I am missing something?
> 
> Here is what I tried:
> 
> With both 4.4.2 and a recent 4.5.0 CVS gnuplot:
>    set term windows enhanced
>    set label 1 "{/Symbol address@hidden e^{-x} dx" at  1.0,0.5 left
>    plot x
> works as expected.
>    set label 1 "{/Symbol address@hidden e^{-x} dx" at  1.0,0.5 left font ",20"
> also works as expected - the whole string is now printed with fontsize 20
> The same goes for the wxt terminal, and for the postscript terminal.
> 
> So I don't see why you have to issue font "{},20" - it's AFAICS not
> valid gnuplot syntax. And it exposes the here reported bug that
> rotated ylabel text is no longer rotated - and others:
> Try the following:
> 
> set term post enhanced font "Helvetica,14"
> set output "test.ps"
> set ylabel "foo in mm^2" font ",10"
> set label 1 "{/Symbol address@hidden e^{-x} dx" at  1.0,0.5 left font ",20"
> plot x
> set output
> 
> set output "test2.ps"
> set ylabel "foo in mm^2" font "{},10"
> set label 1 "{/Symbol address@hidden e^{-x} dx" at  1.0,0.5 left font "{},20"
> plot x
> set output
> 
> I see that test.ps looks fine, but test2.ps has the wrong font for
> both the ylabel and the text label.
> 
> I also tested your example in the bug report.
>   set(gca,"fontname","*");
>   text(0.5,0.5,'\int_0^x e^(-x) dx','fontsize',20)
> and
>   set (gca, "fontname", "Arial")
>   text(0.5,0.5,'\int_0^x e^(-x) dx','fontsize',20)
> both yield the same (correct) result - where the correct result is
> that only the "(" parenthesis is displayed as superscript.
> And both yield the same result with either the "{},20" or the ",20"
> font setting.
> 
> So I am - back at the start - a bit confused as to the original bug report.
> What did you see without the "{}" font setting?
> 
> benjamin

The original report by Michael Godfrey indicates that when using the FLTK 
backend and the fontname "*", that TeX style exponentiation did not work. There 
was no problem for the gnuplot backend.

Did you try the examples for the FLTK backend?

Ben