[Octave-bug-tracker] [bug #58479] plottyy print out is different than onscreen appearance

[Pantxo Diribarne]

Follow-up Comment #3, bug #58479 (project octave):

This is most probably a consequence of bug #45600: for display, we specify the
characters size in pixels when it should be in points. So for screens with a
resolution greater than 72 dpi, characters are down scaled on-screen but not
in printout. 

Actually, bug #45600 is on my top list of annoyance, and I recently tried to
solve it (again) but it is very hard do properly: it is easy to fix the size
of characters onscreen, but then you have to circumvent the fact that gl2ps
interprets pixels as points... 

I think the proper way out is to send scaled data to gl2ps using
gl2psAddPolyPrimitive (undocumented, see [1]). This would also let us stop
using the deprecated GL_FEEDBACK render mode (see [2] for motivations behind
gl2psAddPolyPrimitive) and let us solve bug #48689.

For this to happen there is a lot of work though :-).


[1] https://gitlab.onelab.info/gl2ps/gl2ps/-/blob/master/gl2ps.h
[2] http://www.geuz.org/pipermail/gl2ps/2016/000424.html



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