R help - Jul 2014 - Include plotting symbals pch 16 and 17 into captions / text in pdf graph

Hi

I want to include the plotting symbols pch=16 and pch=17 in text in
the graph used as labels.

This works:

--8<---------------cut here---------------start------------->8---
plot(0:1,0:1, type="n")
points(0.2, 1, pch=16)
mtext(
        text = "pch=16 (\U25CF)",
        side = 3,
        at   = 0.2,
        line = 1,
    )
points(0.8, 1, pch=17)
mtext(
        text = "pch=17 (\U25B2)",
        side = 3,
        at   = 0.8,
        line = 1
    )
--8<---------------cut here---------------end--------------->8---

But I would need this as a pdf and in Calibri font, which does not
include the UTF symbol \U25B2 (the triangle). I got that far:

--8<---------------cut here---------------start------------->8---

cairo_pdf("utftext.pdf", family="Calibri")
plot(0:1,0:1, type="n")
points(0.2, 1, pch=16)
mtext(
        text = "pch=16 (\U25CF)",
        side = 3,
        at   = 0.2,
        line = 1,
    )
points(0.8, 1, pch=17)
mtext(
        text = "pch=17 (\U25B2)",
        side = 3,
        at   = 0.8,
        line = 1
    )
dev.off()
--8<---------------cut here---------------end--------------->8---

which results in the attached pdf (hope it comes through). If not: the
utf symbol for the upward error is displayed as an empty square with a
question mark in it).

Is there a way that I can show the plotting symbol pch=17 in the caption
when using this font?

Thanks,

Rainer

-- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology,
UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa

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