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Posted to fop-users@xmlgraphics.apache.org by Rodolphe VAGNER <ro...@eurodoc-sofilog.com> on 2002/03/26 17:20:13 UTC
ohm symbol not supproted ?
I try a fop transformation in UTF-16 with ohm symbol (greek omega capital letter)
and I find a ' O ' in the pdf result, but µ is supported !!
Can someone help ?
Re: ohm symbol not supproted ?
Posted by "J.Pietschmann" <j3...@yahoo.de>.
I just discovered that FOP 0.20.3 will map greek characters
if the Symbol font is selected, and no longer shows random
other glyphs if some other font is selected.
J.Pietschmann
Re: ohm symbol not supproted ?
Posted by "J.Pietschmann" <j3...@yahoo.de>.
Rodolphe VAGNER wrote:
> Do you mean that it's a problem from Acrobat which can't reconize the
> glyphs,
> or a FOP problem to convert letters to glyphs that acrobat will reconize ?
Well, neither. Or both depending on your mindset.
Fonts map characters to glyphs. Usually, a certain font
(implementation) maps only a very small subset of the
unicode characters. For example, the generally available
Helvetica fonts usually map only the printable characters
defined also by ISO-Latin-1 (iso-8859-1). If you have
such a Helvetica font, and the text is actually greek
(codepoints somewhere in the range U+0300 to U+03FF),
there are no glyphs to show.
The second problem is that PDF doesn't use Unicode.
Characters are simply indizes into the char-to-glyph
mapping table provided by the font. FOP converts the
Unicode characters from the FO source into such indizes.
Some fonts have a mapping table which is utilized by
FOP, sometimes with manual adjustments. In some other
circumstances FOP apparently resorts to simple calculations.
The PDF renderer happily displays whatever glyph it finds
for the index computed by FOP in the current font, or a "#"
if the position is undefined.
The situation is further complicated by the fact that a lot
of Unicode characters have the same or very similar glyphs,
for example uppercase latin A and uppercase greek alpha are
often indistinguishable. This raises expectations which can't
always be met, if there is no mapping, FOP won't map the
source character to the glyph's index even if you see the
appropriate glyph in the font.
> More over I found this in the docs of FOP, and it seams to mean that
> the Symbols (so almost one out of the two omegas) should be displayed
> properly :
> " FOP (building PDF files) normally supports only the base 14 font package
> defined in the Adobe PDF specification. That includes the following fonts:
> Helvetica, Times, Courier, Symbol and ZapfDingbats. "
I don't know what mappings are predefined. It may even depend
both on the environment where your FOP binary has been built
and the environment where your generated PDF is viewed.
Experimentation sometimes helps a bit.
Actually, the Ohm symbol is shown correctly, if you select the
proper font (Symbol).
Does this help?
J.Pietschmann
Re: ohm symbol not supproted ?
Posted by Rodolphe VAGNER <ro...@eurodoc-sofilog.com>.
Do you mean that it's a problem from Acrobat which can't reconize the
glyphs,
or a FOP problem to convert letters to glyphs that acrobat will reconize ?
More over I found this in the docs of FOP, and it seams to mean that
the Symbols (so almost one out of the two omegas) should be displayed
properly :
" FOP (building PDF files) normally supports only the base 14 font package
defined in the Adobe PDF specification. That includes the following fonts:
Helvetica, Times, Courier, Symbol and ZapfDingbats. "
----- Original Message -----
From: "J.Pietschmann" <j3...@yahoo.de>
To: <fo...@xml.apache.org>
Sent: Tuesday, March 26, 2002 9:56 PM
Subject: Re: ohm symbol not supproted ?
> Rodolphe VAGNER wrote:
> > I try a fop transformation in UTF-16 with ohm symbol (greek omega
> > capital letter)
> > and I find a ' O ' in the pdf result, but µ is supported !!
>
> Did you use codepoint U+03A9 (GREE CAPITAL LETTER OMEGA) or
> U+2126 (OHM SIGN)? I get a # for the first (meaning unknown
> glyph mapping) and a W for the latter in the standard font
> (which happens to occupy the same position in the mapping table
> as the upper case omega). Selecting the Symbol font
> <fo:inline font-family="Symbol">ΩΩ</fo:inline>
> still results in a # for the first and the expected glyph
> for the latter.
> Get a font with glyphs for greek letters and look at the
> instructions in the docs directory for installing it if
> you need greek letters.
>
> J.Pietschmann
>
Re: ohm symbol not supproted ?
Posted by "J.Pietschmann" <j3...@yahoo.de>.
Rodolphe VAGNER wrote:
> I try a fop transformation in UTF-16 with ohm symbol (greek omega
> capital letter)
> and I find a ' O ' in the pdf result, but µ is supported !!
Did you use codepoint U+03A9 (GREE CAPITAL LETTER OMEGA) or
U+2126 (OHM SIGN)? I get a # for the first (meaning unknown
glyph mapping) and a W for the latter in the standard font
(which happens to occupy the same position in the mapping table
as the upper case omega). Selecting the Symbol font
<fo:inline font-family="Symbol">ΩΩ</fo:inline>
still results in a # for the first and the expected glyph
for the latter.
Get a font with glyphs for greek letters and look at the
instructions in the docs directory for installing it if
you need greek letters.
J.Pietschmann