-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
Simon Urbanek
Sent: 29 January, 2009 16:29
To: Yan Wong
Cc: [email protected]
Subject: Re: [R-SIG-Mac] Possible mac-specific bug in svg
(cairo) graphics
Yan,
On Jan 28, 2009, at 6:33 , Yan Wong wrote:
On 27 Jan 2009, at 16:16, Simon Urbanek wrote:
I think you got the corresponding response to your post before -
Apologies: I didn't see that reponse.
cairographics cannot locate an italic version of the font -
switching to a font which has the desired traits will produce the
desired output, e.g.:
svg("test.svg", width=4,4,8)
par(family="Arial")
plot.new()
text(0.5,0.5,labels=expression(italic("This should be in
italics")))
dev.off()
Thanks. I tried this with family="Arial", family="Times",
family="serif", family="sans", family="Verdana", and
family="mono",
and they all come out as bold.
I guess if this doesn't happen on other systems, then is must be a
problem with my R or system setup. Unfortunately I don't have
another system to try this out on.
Ah, sorry, my bad - I forgot that you're on 10.4 and I was testing
with 10.5. I do remember that 10.4 is missing italics from several
default fonts (e.g. Helvetica). You can enable fontconfig
debug using
FC_DEBUG=1 -- that will at least tell you what fontconfig found.
To make things worse, FreeType on Mac is quite buggy and screws up
numbering of fonts within a container which results in incorrect
styles - it is something we try to work around, but if FT recognizes
the wrong style we can't do anything about it. From what I can see
this is what happens -- the main difference between 10.4 and 10.5 is
that Arial and friends are supplied as (rf-style) font suitcases in
10.4 which is what FT has trouble dealing with. In 10.5 they come as
individual fonts which FT can deal with just fine.
I know that this is catching straws, but of one the few fonts that
come as TTF in 10.4 is "Euphemia UCAS", so this will produce italic
output even on 10.4:
svg("test.svg", width=4,4,8)
par(family="Euphemia UCAS")
plot.new()
text(0.5,0.5,labels=expression(italic("This should be in italics")))
dev.off()
Although this is a nuisance, working around bugs in 3rd party
libraries on older systems is not high on my priority list, os I
cannot promise anything, but maybe I'll get to it...
The italic versions of Arial, Time, and Verdana are all available,
according to Font Book.
All styles are in a single file and FT picks the wrong one,
unfortunately.
Have you any suggestions as to how I could try and find out
what is
going on here? Can I activate some sort of debugging or
verbose mode
in Cairographics?
FC_DEBUG=1 may help, but FT/cairographics don't have any
debugging env
vars AFAIR.
Cheers,
Simon
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