Your example is not reproducible, but png() does support transparent
backgrounds and you did not specify one (by bg="transparent"). The
native method on a Mac would be png(type="quartz"): have you tried
that?
Yes, there are known problems with cairo font handling on Macs: some
of them have been overcome in R's builtin cairo support, including in
the default type="cairo" for png.
Given that 'cairo' (as in cairographics.org, their preference is not
to capitalize) is a third-party graphics system, it is rather
ambiguous as to whether you meant R's builtin support or the
contributed package Cairo (library(Cairo) appears nowhere in your
code): I am presuming the latter for which incorrect use of italics is
a known (and reported) problem.
Finally, Cairo is a contributed package, and the posting guide
suggests writing to the author/maintainer first. As that is Simon U,
he does read this list but in many other instances that would not be
the case.
On Thu, 4 Mar 2010, Ben Madin wrote:
G'day all,
I am using Cairo to produce output graphics (mainly png), but don't seem to be
able to figure out how to stop the text being rendered in italics.
I am using 10.6.2, and R version 2.10.1 Patched (2010-02-01 r51089).
Using this produces the output as I anticipated (with upright text)
png('outputs/reports_by_province2.png')
barplot(outbreaks.summary$Provinces,names.arg=outbreaks.summary$Year, ylab='Number
of provinces reporting outbreaks', cex.axis=1, cex.names=1) -> tmp
Using this produces a nicer image (the transparent background is important),
but the text is all italicised
Cairo(950,450, 'outputs/reports_by_province.png')
barplot(outbreaks.summary$Provinces,names.arg=outbreaks.summary$Year, ylab='Number
of provinces reporting outbreaks', cex.axis=1.2, cex.names=1.2) -> tmp
I can change the family, ie :
par('family')
[1] "serif"
but Cairo doesn't seem to respect it (I'm actually wanting Helvetica so it
doesn't matter), but I can't fix the font (and I note from the docs:
fonts see pdf, ignored, Cairo automatically detects and embeds fonts
)
So I'm wondering if it is just my installation, a known issue or I've missed
the workaround (using CairoFonts hasn't changed it).
cheers
Beb
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Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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