[Octave-bug-tracker] [bug #49243] printing causes error when figure axes has color "none"

[Dan Sebald]

URL:
  <http://savannah.gnu.org/bugs/?49243>

                 Summary: printing causes error when figure axes has color
"none"
                 Project: GNU Octave
            Submitted by: sebald
            Submitted on: Sat 01 Oct 2016 09:27:40 PM GMT
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

The following illustrates the problem:


octave:60> close all
octave:61> graphics_toolkit ('gnuplot')
octave:62> figure(1)
octave:63> plot([-10:10],[-10:10].^2,'o-')octave:64> set(gca, 'color',
'none')octave:65> print('-dpdflatexstandalone','-color','test')
ans =  1
hax = [](0x1)
ans = 0
error: 'n' undefined near line 412 column 15
error: called from
    print at line 412 column 12
octave:65> graphics_toolkit ('fltk')
octave:66> figure(2)
octave:67> plot([-10:10],[-10:10].^2,'o-')
octave:68> set(gca, 'color', 'none')
octave:69> print('-dpdflatexstandalone','-color','test')
ans =  2
hax = [](0x1)
ans = 0
error: 'n' undefined near line 412 column 15
error: called from
    print at line 412 column 12
octave:69>  findall (2, "-depth", 1, "type", "axes", "-not", "tag",
"legend")ans = -80.669
octave:70>  findall (2, "-depth", 1, "type", "axes", "-not", "tag", "legend",
"-not", "color", "none")
ans = [](0x1)
octave:71> 


The code that is causing the error is this hunk from print.m:


    if (do_hardcopy)
      ## Set background to white for all top-level axes objects
      hax = findall (opts.figure, "-depth", 1, "type", "axes",
                                  "-not", "tag", "legend",
                                  "-not", "color", "none");
      m = numel (props);
      for n = 1:numel(hax)
        props(m+n).h = hax(n);
        props(m+n).name = "color";
        props(m+n).value{1} = get(hax(n), "color");
        set (hax(n), "color", "white");
      endfor
      nfig += n;
    endif


As shown in line octave:70 above, the result of the find all is an empty set
because of the "-not","color","none" setting.  We should consider if that
"color" "none" should in fact exclude printing, but also decide what to do
rather than let an error be thrown.





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