Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y, : font width unknown for character 0x20

Question

I would like to use the free font Lato in ggplot2 graphs since the remainder of my R markdown document is set in this font.

The font is installed on my

Answer 1

I tried to make it work using extrafont but did not succeed. I am still not quite sure but I think it is a bug. Here is a solution using the package showtext:

---
title: "Embedding Fonts in PDF"
output: pdf_document
urlcolor: blue
---

```{r include=FALSE}
# notice the chunk option 'fig.showtext' that tells R to use the showtext 
# functionalities for each ne graphics device opened
knitr::opts_chunk$set(dev = 'pdf', cache = FALSE, fig.showtext = TRUE)

library(ggplot2)
library(showtext)

font_add(family = "Lato", regular = "/Users/martin/Library/Fonts/Lato-Light.ttf") 
```


### Plot with newly set standard font (= Lato) {#lato}
```{r echo=FALSE, out.width = '100%'}
ggplot(mtcars, aes(x=wt, y=mpg)) + 
  geom_point() +     
  ggtitle("Fuel Efficiency of 32 Cars") + 
  xlab("Weight (x1000 lb)") + 
  ylab("Miles per Gallon") + 
  theme(text = element_text(family="Lato"))
```