[Octave-bug-tracker] [bug #62287] Plotting: printing to pdf raises error for non-initialized parameter papersize_points

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?62287>

                 Summary: Plotting: printing to pdf raises error for
non-initialized parameter papersize_points
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Mon 11 Apr 2022 11:46:15 AM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 6.3.0
         Discussion Lock: Any
        Operating System: Any

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Details:

This bug exists since 6.3.0 and is persistent also in 7.1.0.

With 6.3.0 release a new warning message was integrated into printing pdfs to
file in private function 
octave/7.1.0/m/plot/util/private/__print_parse_opts__.m.



The attached example (file test_plot_71.m) yields the following error
message:
error: 'papersize_points' undefined near line 502, column 14
error: called from
    __print_parse_opts__ at line 503 column 9
    print at line 420 column 8
    test_plot_71 at line 37 column 1

Papersize_points are only initialized in this private function, if parameter
canvas_size is empty. However, if this value is set, the call to set
papersize_points never is executed and therefore the intended warning message
fails.

Printing png files is possible.


Since this warning messages was not there in releases prior to 6.3.0, I guess
there are two ways to fix the issue:
1) remove warning message and related if condition in line 498
2) initialize papersize_points correctly. For this solution I have attached
the changes (File bug_papersize.patch) in order to keep the warning. 

However, overall it is unclear to me how this variable is used at all besides
issueing a warning. Papersize_position is not part of the returned structure
arg_st.






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File Attachments:


-------------------------------------------------------
Date: Mon 11 Apr 2022 11:46:15 AM UTC  Name: test_plot_71.m  Size: 1KiB   By:
None

<http://savannah.gnu.org/bugs/download.php?file_id=53071>
-------------------------------------------------------
Date: Mon 11 Apr 2022 11:46:15 AM UTC  Name: bug_papersize.patch  Size: 1KiB  
By: None

<http://savannah.gnu.org/bugs/download.php?file_id=53072>

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