topnush
Take the following MWE:
```
\documentclass{beamer}
\beamertemplatenavigationsymbolsempty
\setbeamersize{text margin left=10mm,text margin right=5mm}
\setbeamertemplate{frametitle}[default][center]
\usepackage{calc}
\usepackage[many]{tcolorbox}
\usepackage{listings}
\lstdefinestyle{duckstyle}{%
moredelim=[is][\color{red}]{|}{|},
mathescape=true,
escapechar=@,
basicstyle=\ttfamily,
columns=fullflexible
}
\lstset{style=duckstyle}
\newcommand{\Var}[1]{\ensuremath{\textcolor{varcolor}{#1}}}
\definecolor{varcolor}{RGB}{15,122,183}
\begin{document}
\begin{frame}[t, fragile]{}
\begin{columns}
\begin{column}{5.2cm} %
\begin{tcolorbox}[top=0pt, left=5pt,right=5pt, colback=blue!5!white, text height=3cm]
\begin{lstlisting}[mathescape, name=code, basewidth = {.3em}]
set $\Var{A}$ = $\emptyset$
For each $\Var{i}$
if $\Var{a_i} \in \Var{A}$
$\Var{\tilde{f}_{a_i}} = \Var{\tilde{f}_{a_i}} + 1$
\end{lstlisting}
\end{tcolorbox}
\end{column}
\begin{column}{\textwidth-5cm} %
\end{column}
\end{columns}
\end{frame}
\end{document}
```
I would like to highlight one instance of `\Var{\tilde{f}_{a_i}}` and draw an arrow from some boxed text placed at an arbitrary position on the right hand side of the slide to it. I only want this to appear for one transition.
Top Answer
samcarter
One can use `hf-tikz` for the highlighting:
```
\documentclass{beamer}
\beamertemplatenavigationsymbolsempty
\setbeamersize{text margin left=10mm,text margin right=5mm}
\setbeamertemplate{frametitle}[default][center]
\usepackage{calc}
\usepackage[many]{tcolorbox}
\usepackage{listings}
\lstdefinestyle{duckstyle}{%
moredelim=[is][\color{red}]{|}{|},
mathescape=true,
escapechar=@,
basicstyle=\ttfamily,
columns=fullflexible
}
\lstset{style=duckstyle}
\newcommand{\Var}[1]{\ensuremath{\textcolor{varcolor}{#1}}}
\definecolor{varcolor}{RGB}{15,122,183}
\tcbset{
colback=white,
}
\usepackage{tikz}
\usetikzlibrary{tikzmark,calc}
\usepackage[beamer,customcolors]{hf-tikz}
\begin{document}
\begin{frame}[t, fragile]{}
\tikzset{baseline,
N/.style={draw, very thick, rounded corners, fill=green!30,
font=\scriptsize}
}
\begin{columns}
\begin{column}{5.2cm} %
\begin{tcolorbox}[top=0pt, left=5pt,right=5pt, colback=blue!5!white, text width=5.2cm, text height=7cm]
\begin{lstlisting}[mathescape, name=code, basewidth = {.3em}]
set $\Var{A}$ = $\emptyset$
For each $\Var{i}$
if $\Var{a_i} \in \Var{A}$
@$
\tikzmarkin<2>{a}
\Var{\tilde{f}_{a_i}}
\tikzmarkend{a}
= \Var{\tilde{f}_{a_i}} + 1$@
\end{lstlisting}
\end{tcolorbox}
\end{column}
\begin{column}{\textwidth-5cm} %
\begin{tikzpicture}[remember picture, overlay]
\draw<2>[->, overlay, dashed] (2,0) to [bend right]([yshift=0.4cm]pic cs:a);
\node<2>[draw,N] at (2,0) {text};
\end{tikzpicture}
\end{column}
\end{columns}
\end{frame}
\end{document}
```
