Grey canvas of `leaflet` map in the pdf_output

Question

I want create leaflet map with some markers. This works well with HTML output, but I also want to send a pdf to some participants who like to have a hard copy.

It works well for html output, but I get a grey canvas around the map in pdf mode. I tried to change width and fig.width and so on, with no real success.

Example file test.Rmd

---
output:
  pdf_document: default
  html_document: default
---

## Test RMarkup file

```{r echo=FALSE}
library(leaflet)
leaflet() %>%
  addTiles %>%
  setView(lng = 13.7463, lat = 51.0628, zoom = 12) %>%
  addMarkers(lng = 13.7444, lat = 51.06162,
             options = markerOptions(title = "Terence Hill Ice Saloon"))
```

PDF output with grey canvas

leflet map with grey canvas

SEAnalyst · Answer

You could use webshot2 to take a a PDF screenshot of the the html map.

---
output:
  pdf_document: default
  html_document: default
---

## Test RMarkup file

```{r echo=FALSE}
## load packages
library(leaflet)
library(htmlwidgets)
library(webshot2)

m <- leaflet() %>%
      addTiles %>%
      setView(lng = 13.7463, lat = 51.0628, zoom = 12) %>%
      addMarkers(lng = 13.7444, lat = 51.06162,
             options = markerOptions(title = "Terence Hill Ice Saloon"))

## saves html then screenshots to PDF
htmlwidgets::saveWidget(m, "temp.html", selfcontained = FALSE)
webshot("temp.html", file = "m.pdf",
        cliprect = "viewport")
```

You could also use webshot2 to export a PNG file which you then can reference in the .Rmd file.

 ---
output:
  pdf_document: default
  html_document: default
---

## Test RMarkup file

```{r echo=FALSE, }
## load packages
library(leaflet)
library(htmlwidgets)
library(webshot2)

m <- leaflet() %>%
      addTiles %>%
      setView(lng = 13.7463, lat = 51.0628, zoom = 12) %>%
      addMarkers(lng = 13.7444, lat = 51.06162,
             options = markerOptions(title = "Terence Hill Ice Saloon"))

## save html to png
htmlwidgets::saveWidget(m, "temp.html", selfcontained = FALSE)
webshot("temp.html", file = "m.png",
        cliprect = "viewport")
```
    
![Terence Hill Ice Saloon, of course](m.png)

manro · Answer

You can do it simplier:

RMD:

---
title: "PIC"
output:
  pdf_document
---
Irgendwo spielte Musik.

\begin{figure}
\centering
```{r, echo = F, warning = F, out.width = '100%'}
library(leaflet)
leaflet() %>%
  addTiles %>%
  setView(lng = 13.7463, lat = 51.0628, zoom = 12) %>%
  addMarkers(lng = 13.7444, lat = 51.06162,
             options = markerOptions(title = "Terence Hill Ice Saloon"))
```
\end{figure}

Output:

Grey canvas of `leaflet` map in the pdf_output

2 Answers