Re: [Gnuplot-info] pdfcairo: superscript in legend shifts text baseline

[Elias A. <eli...@gm...>]

On 05/22/2015 01:17 PM, Tatsuro MATSUOKA wrote:
> I have tested on pdfcairo, pngcairo and wxt terminal on gnuplot 5.1
> (cvs, 2015-05-19) (windows version) and upload a zip archived file.
>
> http://www.geocities.co.jp/tmgpltwin/Files/Files.html#0064
>
> 0064 test.zip, 105,699 bytes, 2015-05-22, zip archived test files on
> cairobased terminals on gnuplot 5.1

Thank you.  Meanwhile, I have also done some more analysis,
using three variables: terminal (png/pdf), font (default font /
Carlito), and gnuplot version (4.6 / 5.0).  Carlito
<http://www.tug.dk/FontCatalogue/carlito/> is the font I use in the plot
that originally led me to post.  With wxt, I get the same results as
with pdfcairo.

First, in the png terminal I do not see the effect.  All the legend
entries are identically vertically aligned w.r.t. their lines.  (Compare
nosuper.png and default-5.0.png.)

With the pdf terminal, the superscripted legend entry is placed further
down.  The space between legend lines is not changed.  (Compare
nosuper.pdf and default-5.0.pdf.)  The shift is larger in 4.6 than in 5.0.

The effect also seems larger with Carlito than with the default font. 
What is more, with the default font, the legend text (without 
superscripts) is approximately centered vertically w.r.t. the line.  But 
for some reason, when using Carlito, it is considerably off-center.

In your plots, I see the same behavior in the pdf and wxt versions, but
curiously enough, the shift also happens in your png version.

You can find my plots at 
<ftp://ftp.tugraz.at/outgoing/assmann/baseline.zip>:

  * {carlito,default}*: plots as mentioned above
  * ruler-*: same, with rulers added for clarity
  * nosuper.*: without any superscripts
  * optcond_origu.pdf: this is my “real” plot; I think this is actually 
a better illustration of the problem than the simple test


	Elias