Hi,
AFAICT, you need to use a Cairo device for being able to display some
Unicode
characters in a plot.
From my experience, the CairoPDF() from library(Cairo) does not work
(and I don't understand the difference with cairo_pdf()), but the
cairo_pdf() from grDevices does work perfectly well for this aim. As far
as I'm concerned, I use it with both ggplot2 and regular plots and it
does a perfect job. Here is a short example:
In an R console:
cairo_pdf(filename = "test.pdf")
plot(1,1,pch = "\u254")
dev.off()
Also, I use it with knitr and it works great. You just have to declare a
specific device ("cairo_pdf").
For example, in an RMarkdown document:
```{r ipaunicode, echo=TRUE, dev='cairo_pdf'}
plot(1, 1, pch = "\u254")
```
and in a LaTeX / knitr document as well:
<<ipaunicode, dev="cairo_pdf">>=
plot(1, 1, pch = "\u251")
@
Hope this helps.
Yours.
Olivier.
On Fri, 10 Mar
2017 17:06:25 +0100 Thierry Onkelinx <thierry.onkel...@inbo.be> wrote:
Dear all,
I'd like to use some UTF-8 characters in a plot. Some of them are not
rendered with saving the plot as pdf. Any suggestions?
library(ggplot2)
symbols <- c("\U1F697", "\U00A9", "\U24DA", "\U00C1")
test <- data.frame(
x = seq_along(symbols) %% ceiling(sqrt(length(symbols))),
y = ceiling(seq_along(symbols) / ceiling(sqrt(length(symbols)))),
symbol = symbols
)
p <- ggplot(test, aes(x = x, y = y, label = symbol)) + geom_text(size
= 10) p
ggsave(p, file = "test.png")
ggsave(p, file = "test.pdf")
The last command gives several similar warnings, all related to the
symbols which are not rendered properly:
Warning messages:
1: In grid.Call.graphics(L_text, as.graphicsAnnot(x$label), ... :
conversion failure on '🚗' in 'mbcsToSbcs': dot substituted for <f0>
I'm running R 3.3.2 under Ubuntu 16.04.1 and ggplot2 2.2.1
Best regards,
Thierry
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for
Nature and Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium
To call in the statistician after the experiment is done may be no
more than asking him to perform a post-mortem examination: he may be
able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does
not ensure that a reasonable answer can be extracted from a given
body of data. ~ John Tukey
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--
Olivier Crouzet, PhD
/Assistant Professor/
@LLING - Laboratoire de Linguistique de Nantes
UMR6310 CNRS / Université de Nantes
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ENT department
Reijksuniversiteit Groningen
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