Xaringan: Export slides to PDF while preserving formatting

Question

I have a Xaringan slide that looks like this:

---
title: "Xaringan test"
output: 
  xaringan::moon_reader:
    self_contained: false
    chakra: 'assets/remark-latest.min.js'
    css: 'assets/presentation.css'
---

### This is a heading

This is some text and numbers 01235.

`Here is some inline code`.

```
block code
```

```{r}
cat("Some R code")
```

$e^{i\pi} + 1 = 0$

---

The rendered HTML looks like below. Custom font, CSS styles and mathjax all render well. This is how it is intended to look.

---

Exporting to PDF using Pagedown.

pagedown::chrome_print("test.html",output="test.pdf")

The custom font and css styles are preserved. The default code font has changed and the mathjax expression is not displayed. Apart from the missing mathjax, it is doing a pretty good job.

---

Exporting to PDF using webshot.

webshot("test.html","test.pdf")

Custom font and css styles are not preserved. The default code font and mathjax is preserved.

---

Anyone got any tips on how to preserve fonts, CSS style and mathjax while exporting to PDF through function?

R version 3.5.2 (2018-12-20)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.2 LTS
webshot_0.5.1      
pagedown_0.1
xaringan_0.8

Answer 1

EDIT: We've renamed the package to "renderthis" to be more general and to support other presentation types, such as Quarto presentations: https://github.com/jhelvy/renderthis

Instead of build_*(), the function names all start with to_*(), e.g.

renderthis::to_pdf("slides.Rmd")

---

I've been building on a package that builds xaringan slides to multiple output types: html, pdf, pptx, gif, and a couple options for a png of the first slide. It should render to PDFs well.

https://github.com/jhelvy/xaringanBuilder

Install the package

# install.packages("remotes")
remotes::install_github("jhelvy/xaringanBuilder")

library(xaringanBuilder)

Build a pdf file from a Rmd or html file:

build_pdf("slides.Rmd")
build_pdf("slides.html")

Include "Complex" or partial slides:

“Complex” slides are slides that contain panelsets or other html widgets / advanced features that might not render well as a pdf. To render these, set complex_slides = TRUE. If you want to build a new slide for each increment on incremental slides, set partial_slides = TRUE.

build_pdf("slides.Rmd", complex_slides = TRUE, partial_slides = TRUE)
build_pdf("slides.html", complex_slides = TRUE, partial_slides = TRUE)

Answer 2

I tried this code Which i modified from yours.

procedure TForm1.Button1Click(Sender: TObject);
var
  png: Graphics.TPortableNetworkGraphic;
begin
  png := Graphics.TPortableNetworkGraphic.Create;

    png.SetSize(100, 100);
    png.Canvas.TextOut(10, 10, 'Hi artem!');
    png.SaveToFile('tst.png');
end; 

And I got this image saved.

I think nothing wrong with your code in regards to PNG image. I think it may be cause by other thing. Maybe DataModuleRequest not allow to have any graphics or UI-load processing or something. Not sure.