如何让图像在框架标题中居中？

Question

我在 Beamer 中使用大都市主题，我想将房屋图像置于框架标题的中心（在空间中）。我该怎么做？下面有一个 MWE。

多谢。

\documentclass[t,aspectratio=169]{beamer}
\usetheme[progressbar=frametitle,block=fill]{metropolis}

\setbeamertemplate{frame numbering}[fraction]
\useoutertheme{metropolis}
\useinnertheme{metropolis}
\usefonttheme{metropolis}
\usecolortheme{owl}
\usepackage{amsmath,amsfonts,amscd,bezier, amssymb, ifthen,amsthm}
\usepackage{graphics}
\usepackage{xcolor}

\usepackage[T1]{fontenc}
\usepackage{float}
\usepackage{pgfplots} % it is required for the legend
\usepackage{mathtools}
\usepackage{changepage}
\usepackage[most]{tcolorbox}




\title{XXXXXXX}
\subtitle{xxxxxxx}
\author{}
\institute{yyyyy}
\date{}

\everymath{\displaystyle}

\setbeamercolor*{item}{fg=yellow}

\setbeamersize{text margin left=3mm,text margin right=1mm}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\newenvironment<>{varblock}[2][.9\textwidth]{%
    \setlength{\textwidth}{#1}
    \begin{actionenv}#3%
        \def\insertblocktitle{#2}%
        \par%
        \usebeamertemplate{block begin}}
    {\par%
        \usebeamertemplate{block end}%
\end{actionenv}}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}
\metroset{background=dark}
\metroset{block=fill}

%\setcounter{page}{0}       
        \begin{frame}
        
        \titlepage
        \thispagestyle{empty}
    \end{frame}

\begin{frame}{\color{red}{Exercises:} {\includegraphics[scale=0.05]{house}}}
\begin{alertblock}{Exercise 1:}
blabla bla
\end{alertblock}

%https://br.depositphotos.com/2467738/stock-illustration-vector-illustration-of-house.html

\begin{alertblock}{Exercise 2:}
blablabla. 
\end{alertblock}
\end{frame}

\end{document}

Answer 1

您可以使用该adjustbox包使图像垂直居中：

\documentclass[t,aspectratio=169]{beamer}
\usetheme[progressbar=frametitle,background=dark]{moloch}% modern fork of the metropolis theme
\setbeamertemplate{page number in head/foot}[totalframenumber]

\usecolortheme{owl}
\usepackage{
%amsmath,amsfonts,amscd,
bezier, 
%amssymb, 
ifthen,
%amsthm
}
%\usepackage{graphics}
%\usepackage{xcolor}

\usepackage[T1]{fontenc}
%\usepackage{float}
\usepackage{pgfplots} % it is required for the legend
\usepackage{mathtools}
\usepackage{changepage}
\usepackage[most]{tcolorbox}
\usepackage[export]{adjustbox}




\title{XXXXXXX}
\subtitle{xxxxxxx}
\author{}
\institute{yyyyy}
\date{}

\everymath{\displaystyle}

\setbeamercolor*{item}{fg=yellow}

\setbeamersize{text margin left=3mm,text margin right=1mm}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\newenvironment<>{varblock}[2][.9\textwidth]{%
    \setlength{\textwidth}{#1}
    \begin{actionenv}#3%
        \def\insertblocktitle{#2}%
        \par%
        \usebeamertemplate{block begin}}
    {\par%
        \usebeamertemplate{block end}%
\end{actionenv}}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}

%\setcounter{page}{0}       
        \begin{frame}
        
        \titlepage
        \thispagestyle{empty}
    \end{frame}

\begin{frame}{\color{red}{Exercises:} {\includegraphics[height=1.5cm,valign=c]{example-image-duck}}}
\begin{alertblock}{Exercise 1:}
blabla bla
\end{alertblock}

\begin{alertblock}{Exercise 2:}
blablabla. 
\end{alertblock}
\end{frame}

\end{document}

Answer 2

如果你想水平居中，你可以使用

\begin{frame}{\rlap{\color{red}{Exercises:}}%
  \hfill\includegraphics[height=\ht\strutbox]{example-image}\hfill
  \llap{right}}

和\rlap导致\llap文本与\hfills 重叠。右侧的文本主要用于显示行尾的位置。

如果要使其相对于文本垂直居中，可以使用

\begin{frame}{{\color{red}{Exercises:}} \raisebox{\dimexpr 0.5\ht\strutbox-0.5\dp\strutbox-0.5\height}%
  {\includegraphics[height=40pt]{example-image}}}

请注意，会\beamer@frametitlebox扩展以适合图像。

Answer 3

您可以\centering在之前添加\insertframetitle。接下来，我们定义并安装这样的模板。

在文档的序言中添加以下定义：

\makeatletter
\defbeamertemplate*{frametitle}{centered}{%
  \nointerlineskip%
  \begin{beamercolorbox}[%
      wd=\paperwidth,%
      sep=0pt,%
      leftskip=\metropolis@frametitle@padding,%
      rightskip=\metropolis@frametitle@padding,%
    ]{frametitle}%
    \metropolis@frametitlestrut@start%
  \centering\insertframetitle%
  \nolinebreak%
  \metropolis@frametitlestrut@end%
  \end{beamercolorbox}%
}
\makeatother