I use a custom LaTex beamer theme in an rmarkdown::beamer_presentation.
As per these SO answers (LaTex theme, colon, theme path), I used several modifications of the YAML header and beamerthemeTHEMENAME.sty.
These LaTex hacks are necessary to apply the LaTex Beamer theme smoothly in the rmarkdown::beamer_presentation.
However, currently, a blank slide is inserted by LaTex before and after the table of contents (ToC) slide (see fig 1 below).
- How can I get rid of these slides?
- Instead, I would ideally have a completely black slide before the ToC and at other instances during the presentation (i.e., to briefly interrupt and "switch off" the presentation in between)
Note: if I use the option toc: true to generate the ToC (instead of using the \tocframedefined in beamerouterthemeTHEMENAME.sty), markdown messes up the vertical alignment of the ToC and it comes without any headline (see fig 2 below).
Fig 1: using Tocframe from LaTex Template to generate ToC (toc:false in YAML header)
Fig 2: using toc:true in YAML header to generate ToC
MWE.Rmd
---
# COMMENT out "title" in YAML header: else markdown generates a second title slide
# ==> if title contains no special characters: feed it straight into LaTex at the end of the YAML header
# ==> if title contains special characters, like ":", feed it in "preamble.tex" sourced in "LaTex Hacks"
subtitle: "Beamer presentation with R-markdown"
institute: "some place"
date: "`r format(Sys.time(), '%B %d, %Y')`"
output:
# beamer_presentation: default
bookdown::pdf_book:
base_format: rmarkdown::beamer_presentation
# Source below in "LaTex Hacks", if want theme to be stored in subfolder (else rmarkdown does not find it)
# theme: "THEMENAME"
# Source "includes" below in "LaTex Hacks" if using custom theme with custom title page
# => else, markdown places the includes at inadequate position in LaTex file, which then either does not show the title or throws an error
# includes: ...
latex_engine: xelatex
toc: false # use LaTex TOC (else vertical alignment is messed up and not headline)
slide_level: 2
classoption: aspectratio=169 # fix aspect ratio of presentation (169 => 16:9, 149 => 14:9, default: 4:3)
#
# LaTex Hacks
# --------------------------
compact-title: false # to remove markdown generated title frame
header-includes:
# - \title{Title if no special characters}
- \input{beamer_files/beamerthemeTHEMENAME.sty}
- \input{beamer_files/preamble} # feed title to LaTex in preamble.tex due to ":"
- \def\titlefigure{img/my_bg}
- \AtBeginDocument{\titleframe} # add title frame defined in beamerouterthemeTHEMENAME
- \makeatletter\beamer@ignorenonframefalse\makeatother
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = FALSE)
```
<!-- TOC - Table of Contents -->
<!-- ======================================================== -->
``` {=latex}
\end{frame}
\tocframe
\begin{frame}
```
## Slide with Bullets
<!-- ======================================================== -->
- Bullet 1
- Bullet 2
- Bullet 3
<!-- Appendix -->
<!-- ======================================================== -->
``` {=latex}
\end{frame}
\appendix
\begin{frame}
```
beamerthemeTHEMENAME.sty
\mode<presentation>
% Tizk, textpos, graphics
\RequirePackage{tikz}
\RequirePackage{textpos}
\RequirePackage{booktabs}
% Beamer settings
\input{beamer_files/beamercolorthemeTHEMENAME.sty}
\input{beamer_files/beamerouterthemeTHEMENAME.sty}
\setbeamertemplate{navigation symbols}{}
\mode<all>
beamerouterthemeTHEMENAME.sty
\mode<presentation>
% Redefine \insertshortinstitute to allow multiple lines
\makeatletter
\renewcommand{\insertshortinstitute}{\beamer@shortinstitute}
\makeatother
% Title frame
\def\titlefigure{img/my_bg}
\newlength\titleboxwidth
\setlength{\titleboxwidth}{0.43\textwidth}
\newcommand{\titleframe}{%
{
\setbeamertemplate{background}{
\begin{tikzpicture}
\useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);
\ifx\titlefigure\empty
\fill[titlebgcolor] (6.3mm,6.4mm) rectangle (\the\paperwidth-8.3mm,\the\paperheight-13mm);
\else
\node at (current page.center) [anchor=center,yshift=-3.5mm] {\includegraphics[width=\the\paperwidth-19mm]{\titlefigure}};
\fi
\node at (current page.north east) [anchor=base east, xshift=-8.3mm, yshift=-6.3mm, align=left, inner sep=0mm, font=\fontsize{5.5}{6.6}\selectfont] {
\insertshortinstitute
};
\node at (current page.north west) [anchor=south west, inner sep=0mm, xshift=8.3mm, yshift=-8.6mm] {
\includegraphics[height=3.8mm]{img/my_logo}
};
\end{tikzpicture}
}
\setbeamertemplate{footline}{}
\begin{frame}[noframenumbering]
\begin{tikzpicture}
\useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);
\node [
shift={(-11.5mm,-1.8mm)},
fill=titlefgcolor!50!white,
minimum width=0.46\paperwidth,
minimum height=18mm,
anchor=west,
inner sep=4mm
] at (current page.west) {
\hspace*{9mm}
\begin{minipage}{\titleboxwidth}
\raggedright
\usebeamerfont{title}\usebeamercolor[fg]{title}\inserttitle\par
\usebeamerfont{author}\usebeamercolor[fg]{author}\insertauthor\par
\usebeamerfont{date}\usebeamercolor[fg]{date}\insertdate
\end{minipage}
};
\end{tikzpicture}
\end{frame}
}
}
% TOC frame
\newcommand{\tocframe}{%
\begin{frame}
\frametitle{Outline}
\tableofcontents
\end{frame}
}
% Section title frame
\AtBeginSection[]
{
\begin{frame}
\frametitle{Outline}
\large
\tableofcontents[currentsection]
\end{frame}
}
% Frame title
\setbeamertemplate{frametitle}{
\vspace{2mm}
\insertframetitle \\
\usebeamerfont{framesubtitle}\insertframesubtitle
\vspace{2.5mm}
}
% Footline
\setbeamertemplate{footline}{
\leavevmode%
\hyperlink{toc---table-of-contents}{\includegraphics[width=12mm,trim=0mm 0.4mm 0mm 0mm]{img/my_logo.png}}
\hfill
\hyperlinkappendixstart{\insertframenumber/\inserttotalframenumber}
\vspace{3mm}
}
\mode<all>
preamble.tex
% "title" is commented out in YAML header: else markdown generates a second title slide
% if title contains no special characters: feed it straight into LaTex at the end of the YAML header
% if title contains special characters, like ":", feed it to LaTex here:
\title[short version]{First line of the title:\\ second line of the title}
