Re: Visual comparison of plot files

[Ben Abbott]

On Jul 3, 2014, at 4:52 AM, Andreas Weber <address@hidden> wrote:

> On 30.06.2014 19:51, Rik wrote:
> 
>>> * gnuplot + ftlk: fill_01_1, fill_02_1:
>>>  hidden edges keep visible in matlab, not with fltk or gnuplot
>> 
>> Are they visible on screen?  Matlab also uses gl2ps, I think, to print
>> things and there are some differences between what is rendered on-screen
>> and what is rendered in the png file.  If I run demo ('fill', 1) in FLTK
>> then the on-screen image shows the hidden edge.  It is only the printed
>> version that differs. 
> 
> No, in ML they are invisible on screen. When printing to PNG or JPEG the
> hidden line becomes visible, when printing to ps it invisible (same
> output like on-screen and gnuplot+fltk).
> 
> Btw, you mentioned gl2ps: As you know we can print with fltk without a
> mapped window https://savannah.gnu.org/bugs/?33180 and as I read from
> the comments this is due to gl2ps which needs a mapped window in order
> to print. If ML also uses gl2ps, how are they able to print without
> window or display when started with -nodisplay?
> 
> -- Andy

I don't know if Matlab specifically uses gl2ps, but my impression (?) is that 
they use an equivalent approach.

However, Matlab has three methods for rendering a figure.  The default method 
is not OpenGL based.

set (gcf, 'renderer')
[ {painters} | zbuffer | OpenGL | None ]

Ben