r - knitr, cairo and ggplot2: font family 'Source Code Pro' not found in PostScript fontdatabase -

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trying fix problem otf-fonts have (see how use otf-font in ggplot2 graphics?) found can use these fonts ggplot2.

using knitr rmd-files okay:

--- title: "fonttest" author: "me" date: "22. april 2015" output: html_document ---  ```{r, echo=false} library(ggplot2)  ggplot(mtcars, aes(x=wt, y=mpg, color=factor(gear))) + geom_point() +   ggtitle("fuel efficiency of 32 cars") +   xlab("weight (x1000 lb)") + ylab("miles per gallon") +   theme(text=element_text(size=16, family="arial")) ```

but when want use latex (rnw-files) error:

\documentclass{article}  \begin{document} \sweaveopts{concordance=true}  <<>>= sys.setenv(lang = "en") library(ggplot2, quietly=true) @    <<>>= ggplot(mtcars, aes(x=wt, y=mpg, color=factor(gear))) + geom_point() +   ggtitle("fuel efficiency of 32 cars") +   xlab("weight (x1000 lb)") + ylab("miles per gallon") +   theme(text=element_text(size=16, family="arial")) @  \end{document}

here's error:

writing file test.tex processing code chunks options ...  1 : echo keep.source term verbatim (test.rnw:6)  2 : echo keep.source term verbatim (test.rnw:13) error in grid.call.graphics(l_text, as.graphicsannot(x$label), x$x, x$y,  :    invalid font type calls: <anonymous> ... drawdetails -> drawdetails.text -> grid.call.graphics in addition: there 50 or more warnings (use warnings() see first 50) execution halted

i'm using mac os x mavericks.

update

i found work around using cairo:

\documentclass{article}  \begin{document}    <<>>=   sys.setenv(lang = "en") library(ggplot2, quietly=true) library(cairo) @    <<dev='cairo_pdf'>>=    ggplot(mtcars, aes(x=wt, y=mpg, color=factor(gear))) + geom_point() +   ggtitle("fuel efficiency of 32 cars") +   xlab("weight (x1000 lb)") + ylab("miles per gallon") +   theme(text=element_text(size=16, family="source code pro"))  @  \end{document}

but lot's of warnings:

## warning in grid.call(ltextbounds, as.graphicsannot(x$label), x$x,x$y, :  font family 'source code pro' not found in postscript fontdatabase

i avoid suppressing these warnings. have rid of these warnings?

i found following solution:

i use

\usepackage{tikz}

and

<<plot, dev='tikz'>>

in .rnw file. doing way fonts of latex project in plots.


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