Custom graphics devices in knitr

knitr-cairo.Rnw

\documentclass{article}

\begin{document}

This demo shows you how to use the Palatino font in the Cairo PDF device.

<<setup>>=
my_cairo = function(file, width, height) {
  cairo_pdf(file, width, height, family = 'Palatino')
}
@

Now we can use the custom device; remember to specify the figure extension to be
\texttt{pdf}.

<<test-cairo, dev='my_cairo', fig.ext='pdf', fig.width=4.5, fig.height=3>>=
plot(1, main='Hello, Palatino', xlab='This is x-axis', ylab='This is y-axis')
@

But since knitr 0.6, this can be much easier:

<<dev-args, dev='cairo_pdf', dev.args=list(family='Palatino'), fig.width=4.5, fig.height=3>>=
plot(1, main='Hello, Palatino', xlab='This is x-axis', ylab='This is y-axis')
@

\end{document}