Custom fonts in ggplot2 with Cairo

ggplot_cairo.R

library(ggplot2)
library(Cairo)  # MAGIC PACKAGE

fake.data <- data.frame(x = rnorm(100), y = rnorm(100), z = rbinom(100, 1, 0.5))

p <- ggplot(fake.data, aes(x=x, y=y)) + 
  geom_line() + 
  labs(x="Science", y="More science", title="Here's a title") + 
  facet_wrap(~ z) + 
  theme_bw() + 
  # Add whatever fonts you want to any element_text() things in theme()
  theme(title=element_text(family="Source Sans Pro Semibold"),
        axis.title=element_text(family="Source Sans Pro Light"),
        strip.text=element_text(family="Source Sans Pro Light"))
p

# device=cairo_pdf is the magic part. That's how the fonts get embedded.
ggsave(p, filename="~/Desktop/blah.pdf", 
       width=5, height=3.5, units="in", device=cairo_pdf)
ggsave(p, filename="~/Desktop/blah.png", 
       width=5, height=3.5, units="in")