是否可以在 rmarkdown 呈现的 pdf 文档中包含 svg 图像？

Question

I want an svg image to be embedded in an pdf document that I render by using rmarkdown. This doesn't seem possible, or do I miss something? If it's not possible is there a way to first convert the .svg image to a .png before embedding it?

In my rmarkdown file it looks like this (notice the two different kinds of inserting the image):

```{r results="asis",eval=TRUE,echo=FALSE,message=FALSE, error=FALSE, warning=FALSE, comment = NA,fig.height=10}

cat("![](svg_file.svg)")

```

![](svg_file.svg)

Answer 1

Now we can simply use the cowplot library to read an image and plot it in R markdown.

```{r figSvg,eval=TRUE,echo=FALSE,message=FALSE, error=FALSE, warning=FALSE,fig.height=10}

library(cowplot)
fig_svg<-cowplot::ggdraw()+cowplot::draw_image("http://jeroen.github.io/images/tiger.svg")
plot(fig_svg)

Answer 2

I found a solution that works for me. It is based on using the svg LaTeX package and some LaTeX code inside your Rmarkdown file.

This can be achieved in these main steps:

1. Include the svg package to the LaTeX preamble. This can be done using the Rmarkdown header.
2. Make sure that LaTeX is called with the --shell-escape option enabled. This can also be done using the Rmarkdown header.
3. Include your SVG image using \\includesvg{svg-image} inside your Rmarkdown text. Be careful, do not include the file extension .

Make sure to use pdflatex as the LaTeX engine. Other engines will probably work as well, but they will require different options...

The following is a example that works in my machine, having a SVG image called svg-image.svg in the working directory.

---
output: 
  pdf_document:
    latex_engine: pdflatex
    pandoc_args: "--latex-engine-opt=--shell-escape"
header-includes:
   - \usepackage{svg}
---

\includesvg{svg-image}

I hope it helps!