I'm writing on a beamer presentation in rmarkdown and I have two types of frames which should differ by their background. So I wrote two functions like that in latex:
\newcommand{\settitlestyle}{
\setbeamertemplate{background canvas}{%
\includegraphics[width = \paperwidth, height = \paperheight]
{backgroundtitle.jpg}}
}
\\setmainstyle
is exactly the same command but another jpg.
In the YAML I have already input a tex file that defines the functions and calls \\settitlestyle
. Works. But after the first slide I want to switch to the mainstyle. When I call \\setmainstyle
in the markdownfile nothing happens.
The problem with your \\setmainstyle
command is that it will be used inside a frame and thus be void.
To avoid this problem you could use the same strategy as in https://tex.stackexchange.com/questions/173201/beamer-template-with-different-style-options-for-frames to create a frame option which will change the background.
Unfortunately rmarkdown simply ignores user created frame options and only passes on a tiny list of predefined options. To trick rmarkdown one could repurpose a frame option which is normally not used by beamer, the standout
frame option (it is only used by the metropolis theme)
---
output:
beamer_presentation:
keep_tex: true
includes:
in_header: preamble.tex
---
# frametitle
test
# frametitle with different background {.standout}
test
# frametitle
test
and preamble.tex
\usepackage{etoolbox}
\defbeamertemplate{background canvas}{mydefault}{%
\includegraphics[width=\paperwidth,height=\paperheight]{example-image-b}
}
\defbeamertemplate{background canvas}{standout}{%
\includegraphics[width=\paperwidth,height=\paperheight]{example-image-a}
}
\BeforeBeginEnvironment{frame}{%
\setbeamertemplate{background canvas}[mydefault]%
}
\makeatletter
\define@key{beamerframe}{standout}[true]{%
\setbeamertemplate{background canvas}[standout]%
}
\makeatother
or if you want to change the background for all following frames:
\usepackage{etoolbox}
\defbeamertemplate{background canvas}{mydefault}{%
\includegraphics[height=\paperheight,page=2]{example-image-duck}
}
\defbeamertemplate{background canvas}{standout}{%
\includegraphics[height=\paperheight]{example-image-duck}
}
\setbeamertemplate{background canvas}[mydefault]%
\makeatletter
\define@key{beamerframe}{standout}[true]{%
\setbeamertemplate{background canvas}[standout]%
}
\makeatother
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