fltk does not work on cygwin version octave-6.4.0

Wed Jun 22 10:37:46 GMT 2022

> ----- Original Message -----
> From: "Tatsuro MATSUOKA" 
> To: "Marco Atzeri"; "cygwin
> Date: 2022年06月22日 水 12:53
> Subject: Re: fltk does not work on cygwin version octave-6.4.0
> > > ----- Original Message -----
> > > From: "Marco Atzeri" 
> > > To: "cygwin
> > > Date: 2022年06月22日 水 02:06
> > > Subject: Re: fltk does not work on cygwin version octave-6.4.0
> > > On 21.06.2022 07:15, Tatsuro MATSUOKA wrote:
> > > > fltk does not work on cygwin version octave-6.4.0
> > > > 
> > > > octave:1> graphics_toolkit fltk
> > > > octave:2> plot(1:10);
> > > > Insufficient GL support
> > > > error: unable to plot due to insufficient OpenGL support
> > > > 
> > > > plot windows flashes and disappear immediately
> > > > 
> > > > fltk graphics_toolkit works octave on native windows.
> > > > 
> > > > Tasuro
> > > > 
> > > > 
> > > 
> > > Hi Tatsuro,
> > > 
> > > in general the fltk interface is a deprecated one
> > > and upstream was talking to remove it.
> > > 
> > > It never performed good enough on any platform and
> > > has a serious bug of rounding.
> > > 
> > > My suggestion for toolkits:
> > > 
> > > with octave-cli use gnuplot
> > > with octave use QT
> > > 
> > > Regards
> > > Marco
> > 
> > Unfortunately in my PC, we cannot see plot on qt because plot window is (case --gui) or black (case --no-gui).
> Sorry I forgot to write a word.
>> Unfortunately in my PC, we cannot see plot on qt because plot window is white (case --gui) or black (case --no-gui).
>> Tatsuro
Is the below related to the issue?
>> __opengl_info__
warning: __opengl_info__: can not obtain OpenGL information
warning: called from
 __opengl_info__ at line 69 column 5
Similar behaviors happen qt graphics on octave-7.1.0 on native Windows.
Tatsuro