On 2010-04-05 14:18-0700 David MacMahon wrote:
> Example 6 on the PLplot website shows centered dots for codes 92 and
> 95 rather than the expected backslash ('\') and underscore ('_').
> Code 94 shows as a degree symbol rather than a circumflex ('^'), but
> at least that matches PGPLOT (see http://www.astro.caltech.edu/~tjp/
> pgplot/hershey.html).
>
> FWIW, the docs for plpoin say "If code is between 32 and 127, the
> symbol is simply the corresponding printable ASCII character in the
> default font."
Hi Dave:
Thanks, for your good issue-spotting abilities. The issue is that our
Hershey fonts don't have correct glyphs for this region (see the results of
examples/x06c -dev xwin), and we simply propagated that error (displayed in
example 7 for -dev xwin) to our PostScript and TT fonts translation tables.
I have partially fixed this issue locally, but I am still searching for one
stubborn glyph and trying to correlate what is output in example 7 (which we
use to check changes to fonts/plhershey-unicode.csv which controls the
translation of Hershey index to unicode) and what is output in example 6.
Talk about many obfuscating levels of translation! That code is a nest of
snakes.
I will commit when done and the result should look good for our TTF devices
(e.g., all our cairo and qt devices) and our PostScript devices.
After that commit, the Hershey font error will remain for our devices that
still use Hershey fonts. I don't care since I don't use such devices any
more for critical work. If you do care, I will be happy to accept your
patch. Our Hershey fonts can be regenerated from the code in the fonts
subdirectory if you specify the -DBUILD_HERSHEY_FONTS=ON option. However,
you would have to figure out the format contained in the various *.c files
and fix the drawing data corresponding to codes 92, 94, and 95.
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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