[Octave-bug-tracker] [bug #50267] FLTK: annotation only works if an axes already exists

[Rik]

URL:
  <http://savannah.gnu.org/bugs/?50267>

                 Summary: FLTK: annotation only works if an axes already
exists
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Thu 09 Feb 2017 11:15:01 AM PST
                Category: Octave Function
                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:

For some reason, hopefully trivial to find, the annotation command displays a
blank window if the existing figure doesn't have an axes object.

Code to reproduce:


close all
graphics_toolkit fltk
h = annotation ("rectangle", [0.2 0.7 0.2 0.2])


A new figure is created, and h holds a graphics object handle, but nothing is
displayed.  By contrast, Qt works.


close all
graphics_toolkit qt
h = annotation ("rectangle", [0.2 0.7 0.2 0.2])


It is enough to add an axes to have this work


close all
graphics_toolkit fltk
h = annotation ("rectangle", [0.2 0.7 0.2 0.2])
hax = axes


The issue seems to be that when there is no handlevisible, axes object below
the figure Octave believes that nothing needs to be drawn.





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