[Octave-bug-tracker] [bug #46292] printed figure with multiple plots, in absolute positions, is truncated

[Pantxo Diribarne]

Update of bug #46292 (project octave):

                  Status:                    None => Confirmed              

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Follow-up Comment #2:

Hi,

Thanks for your report. Your example is a bit complicated and I think it boils
down to the script bellow:


## Use absolute units for the axes object
hax = axes ("units", "centimeters");
set (gcf, "paperpositionmode", "auto")
print foo.pdf


For OpeznGL based toolkits (I don't know much about gnuplot), the problem is
that when printing we basically have to assume "screenpixels=>points". The
library we use for printing (gl2ps) captures our OpenGL operations and
interprets pixels as points. See this discussion in which I was concerned
about text (*fixed size* as in your example):
http://www.geuz.org/pipermail/gl2ps/2015/000418.html
 
So when using "paperpositionmode"="auto" we want to draw a figure that has the
exact same size as on-screen: if it is X pixels wide on-screen, we have to
redraw it (this is one of the reasons for the flickering) on a canvas that is
(X/screenpixelsperinch*72) wide so that the final figure has the right size.
As people tend to often have screenpixelsperinch>72 this usually means
downsizing the figure. Unfortunately any fixed size object (text or absolute
"units" property) will end-up being magnified in the printout figure.

Are there other issues I didn't notice that your example shows and that mine
neglects?

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