Re: Print plots without GUI

[Ben Abbott]

On Jan 18, 2012, at 3:14 PM, Philip Nienhuis wrote:

> Ben Abbott wrote:
>> On Jan 17, 2012, at 5:14 PM, PhilipNienhuis wrote:
>> 
>>> malleor wrote
>>> 
>>>> bpabbott wrote
>>>> 
>>>>> Which operating system are you running ?
>>>>> 
>>>>> And which graphics toolkit are your using ?
>>>> 
>>>> I'm running Win7 x64, using Octave 3.4.3 i686-pc-mingw32 and
>>>> /available_graphics_toolkits/ says I've got FLTK and gnuplot with it.
>>>> (Note that /graphics_toolkit/ has no argument-less version in Octave
>>>> 3.4.3.) Apparently I've been using *FLTK* there since the following code
>>>> works fine:
>>>> 
>>>> octave:1>  graphics_toolkit('gnuplot')
>>>> octave:2>  figure(1, 'visible', false)
>>>> octave:3>  plot(1:10,1:10)
>>>> octave:4>  print test.png
>>>> octave:5>
>>>> 
>>>> and the following fails hard:
>>>> 
>>>> octave:1>  graphics_toolkit('fltk')
>>>> octave:2>  figure(1, 'visible', false)
>>>> octave:3>  plot(1:10,1:10)
>>>> panic: Segmentation violation -- stopping myself...
>>>> attempting to save variables to `octave-core'...
>>>> save to `octave-core' complete
>>>> 
>>>> I haven't been able to solve this myself. Any suggestions?
>>>> 
>>>> Regards,
>>>> malleor
>>> 
>>> Confirmed on Windows XP SP3 (older) with Octave-3.4.3-MinGW (same as yours).
>>> 
>>> But with Octave-3.6.0-MinGW on the same system, it all works OK.
>>> 
>>> So waiting for a prepackaged 3.6.0 version is all I can suggest at the
>>> moment.
>>> (I put my 3.6.0 together from Tatsuro's building pieces but I wouldn't
>>> suggest non-testers and non-developers to try the same.)
>>> 
>>> Philip
>> 
>> Philip,
>> 
>> Does Octave-3.6.0-MinGW actually produce a figure when the fltk toolkit is 
>> active and the figure is hidden ?
>> 
>>      graphics_toolkit flkt
>>      close all
>>      figure (1, "visible", false)
>>      plot (rand (3))
>>      print test.png
>> 
>> Ben
> 
> If I input
> 
>   figure (1, "visible', true)
> 
> after the plot command the plot shows up. So yes, a hidden plot is produced.
> I can switch the plot window on and off at will using true or false in this 
> command.
> 
> However, as long as the figure is hidden, no printed plot can be produced. 
> Octave returns awfully quick to the prompt then compared to when the plot is 
> shown.
> 
> Philip

Ok. Good, that is how I thought it was supposed to work for all platforms.

The fltk toolkit has some problems on MacOS X and Windows. Unfortunately, those 
on MacOS and Windows have little expertise with the fltk toolkit, so the 
problems linger.

I'm hoping we can work on these sort of problems at OctConf 2012.

        http://www.octave.org/wiki/index.php?title=OctConf_2012

Ben