[Octave-bug-tracker] [bug #49215] gnuplot toolkit window position jumps with colormap() upon first draw

[Dan Sebald]

URL:
  <http://savannah.gnu.org/bugs/?49215>

                 Summary: gnuplot toolkit window position jumps with
colormap() upon first draw
                 Project: GNU Octave
            Submitted by: sebald
            Submitted on: Wed 28 Sep 2016 06:32:39 PM GMT
                Category: Plotting with gnuplot
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate 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:

There was recently a "position" option added to qt and wxt terminals in
gnuplot.  That's nice, but the consequence is that sometimes the window is
initially drawn in the default gnuplot location then jumps immediately to the
prescribed position.  For example, with gnuplot/qt-term I am using imshow(),
and imshow() calls the following:

colormap(gray());

Similary,

figure();

will cause a jump as well.  Try something like

[exit]
[launch]
colormap(gray());

So, I'm wondering if we can take out some initial draw or add some missing
position property at the start that will get rid of that window jump.

As a side note, the fact that position applies to X11, Windows, (and now) qt,
wxt is already noted at one location in the code, so the following redundancy
can be removed.


diff --git a/scripts/plot/util/__gnuplot_drawnow__.m
b/scripts/plot/util/__gnuplot_drawnow__.m
--- a/scripts/plot/util/__gnuplot_drawnow__.m
+++ b/scripts/plot/util/__gnuplot_drawnow__.m
@@ -237,8 +237,8 @@ function enhanced = gnuplot_set_term (pl
               set (0, "units", units);
             end_unwind_protect
             if (all (screen_size > 0))
-              ## For X11/Windows, set the figure positon as well as the size
-              ## gnuplot position is UL, Octave's is LL (same for
screen/window)
+              ## Set the figure positon as well as the size gnuplot position
+              ## is UL, Octave's is LL (same for screen/window)
               gnuplot_pos(2) = screen_size(2) - gnuplot_pos(2) -
gnuplot_size(2);
               gnuplot_pos = max (gnuplot_pos, 1);
               size_str = sprintf ("%s position %d,%d", size_str,






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