Re: EXC_BAD_ACCESS [was: persistent listeners]

[Ben Abbott]

On Mar 13, 2011, at 11:31 AM, logari81 wrote:

> On Sun, 2011-03-13 at 11:20 -0400, Ben Abbott wrote:
>> On Mar 12, 2011, at 5:06 PM, logari81 wrote:
>> 
>>> Yes your last change would cancel my intention in my previous change.
>>> The idea is that the lines:
>>> 
>>> ||    if (uimenu->items_to_show ())
>>> ||      show_menubar ();
>>> ||    else
>>> ||      hide_menubar ();
>>> 
>>> should be before the first allocation of the canvas:
>>> 
>>> ||      // This allows us to have a valid OpenGL context right away.
>>> ||      canvas->mode (FL_DEPTH | FL_DOUBLE );
>>> ||      if (fp.is_visible ())
>>> ||        {
>>> ||          show ();
>>> ||          if (fp.get_currentaxes ().ok())
>>> ||            show_canvas ();
>>> ||          else
>>> ||            hide_canvas ();
>>> ||        }
>>> 
>>> otherwise, at least with my fltk version, the first time anything is
>>> plotted is vertically shifted by the menu bar height which was very
>>> annoying.
>>> 
>>> So we have to find some other solution. Maybe Shai could give us a hint.
>>> 
>>> Kostas
>> 
>> I'm not certain, but it sounds like a problem I have seen on MacOS.
>> 
>> In my case, I was unable to see the menu bar and the status bar at the same 
>> time. In each of these cases, the plot was shifted vertically.
>> 
>> I was able to fix this by uninstalling fltk-aqua-1.1.10. The package for 
>> fltk-aqua-shlibs-1.1.10 remains installed.
>> 
>> Ben
> 
> hmm, should I revert the first half of my problematic changeset in hg
> until we find a better solution?
> 
> Unfortunately I do not have a deep understanding of how fltk+OpenGL
> works so that I can propose a reliable way for fixing these canvas
> initialization issues.
> 
> Kostas

I checked on Ubuntu, the problematic changset produces a core-dump for ...

        graphics_toolkit fltk
        figure (1, "visible", "off")

... as Soren had expected.

I think it best to revert 12483.

I'm still curious about the vertical shift. I used the simple script below to 
verify that I no longer have a vertical shift.

        x = repmat (0:0.1:1, 11, 1);
        figure (1)
        plot ([x, x'], [x', x])
        axis off
        set (gca, "position", [0 0 1 1])

With 12483 reverted I don't see a shift.  I've attached a pdf that looks the 
same as what is displayed.

Ben

test_shift.pdf
Description: Adobe PDF document