[Octave-bug-tracker] [bug #36052] Incorrect font in eps output produced by the gnuplot backend

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?36052>

                 Summary: Incorrect font in eps output produced by the gnuplot
backend
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sat 31 Mar 2012 10:40:56 AM UTC
                Category: Plotting with gnuplot
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: Moreno Marzolla
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.1
        Operating System: GNU/Linux

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Details:

Consider the following code snipped:


set(gcf,"paperorientation","landscape");
papersize=[5 4] * 0.85; 
margin=[0 0];
set(gcf,"papersize",papersize);
set(gcf,"paperposition", [margin papersize-margin*2]);
plot([1:10],[1:10],";Foobar;");
xlabel("Foo");
ylabel("Bar");
title("Foobar plot");
print("plot.eps","-depsc2","-debug");


Using octave 3.2.3 (ubuntu 10.04), the gnuplot backend produces the attached
file plot.eps.correct, which is correct.

The same script with octave 3.6.1 (manually compiled from the tarball
available at octave.org) produces the attached file plot.eps.wrong: note that
the font used for title and axis labels is courier instead of helvetica. 

By looking at octave-print-commands.log, I observe that Octave 3.2.3 outputs
something like:


set title "Foobar plot" font ",12" enhanced;
set xlabel "Foo" textcolor rgb "#000000" font ",12" enhanced rotate by
0.000000;
unset x2label;
set ylabel "Bar" textcolor rgb "#000000" font ",12" enhanced rotate by
90.000000;


wihle Octave 3.6.1 outputs something like:


set title "Foobar plot" font "{},20" enhanced;
set xlabel "Foo" textcolor rgb "#000000" font "{},20" enhanced rotate by
0.000000;
unset x2label;
set ylabel "Bar" textcolor rgb "#000000" font "{},20" enhanced rotate by
90.000000;


I believe that the problem lies in the font specification 


font "{},20"


To fix the wrong font name, the following workaround may work (it seems to
work in this specific case, I am not claiming it is the correct fix to this
problem): in scripts/plot/private/__go_draw_axes__.m, around line 2231,
replace


function [f, s, fnt, it, bld] = get_fontname_and_size (t)
  if (isempty (t.fontname) || strcmp (t.fontname, "*"))
    fnt = "{}";
  else
    fnt = t.fontname;
  endif


with


function [f, s, fnt, it, bld] = get_fontname_and_size (t)
  if (isempty (t.fontname) || strcmp (t.fontname, "*"))
    fnt = "";
  else
    fnt = t.fontname;
  endif


Using the patch above, Octave 3.6.1 produces the attached file
plot.eps.better, which looks better. 

The font is a bit large, but this is not a bug (I actually prefer larger fonts
since labels are more readable using the default plot size). The font can be
manually reduced using:


print("plot.eps","-depsc2","-F:6","-debug");




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File Attachments:


-------------------------------------------------------
Date: Sat 31 Mar 2012 10:40:56 AM UTC  Name: plot.eps.correct  Size: 22kB  
By: None

<http://savannah.gnu.org/bugs/download.php?file_id=25527>
-------------------------------------------------------
Date: Sat 31 Mar 2012 10:40:56 AM UTC  Name: plot.eps.wrong  Size: 22kB   By:
None

<http://savannah.gnu.org/bugs/download.php?file_id=25528>
-------------------------------------------------------
Date: Sat 31 Mar 2012 10:40:56 AM UTC  Name: plot.eps.better  Size: 22kB   By:
None

<http://savannah.gnu.org/bugs/download.php?file_id=25529>

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