使用shapepar作为投影仪标题页

Question

寻找解决方案以避免在尝试协同工作时出现算术tikz错误shapepar。

\documentclass{beamer}
\usepackage{tikz,shapepar}

\setbeamertemplate{title page}{%
\begin{tikzpicture}[remember picture,overlay]
%\node[circle,fill=black,text=white] {\shapepar{\circleshape} \inserttitle\par}; % <- not working
\end{tikzpicture}}

\title{Some title with variable length}
\begin{document}
\maketitle

\begin{frame}
\shapepar{\circleshape} \huge\inserttitle % <- working fine here
\end{frame}
\end{document}

根据 David 的说法，语法应该是：\node[shape=circle,text width=0cm, fill=black,text=white] {\shapepar{\circleshape} \inserttitle\par};，text width=0cm其中，以便节点随内容缩放。无论如何，根据的长度\inserttitle，我仍然会遇到算术溢出。

Answer 1

节点是\hbox不能有段落的，除非你指定text width或align=<...>键（当它成为minipage环境时）

\documentclass{beamer}
\usepackage{tikz,shapepar}

\setbeamertemplate{title page}{%
\begin{tikzpicture}[remember picture,overlay]
\node[text width=6cm, fill=black,text=white] {\shapepar{\circleshape} \inserttitle\par}; % <- not working
\end{tikzpicture}}

\title{Some title with variable length}
\begin{document}
\maketitle

\begin{frame}
\shapepar{\circleshape} \huge\inserttitle % <- working fine here
\end{frame}
\end{document}

或者使用长标题版本，并修改除法运算符，使其不会溢出（只返回\maxdimen

\documentclass{beamer}
\usepackage{tikz,shapepar}
\makeatletter
\def\fpdivide#1#2{%
\@tempcntb #2\relax
\multiply\@tempcntb10
#1=\dimexpr(#1*\p@ /\@tempcntb) \relax
\ifdim#1>0.1\maxdimen
#1=\maxdimen
\else
\multiply#1 by 10
\fi
}

\makeatother

\setbeamertemplate{title page}{%
\begin{tikzpicture}[remember picture,overlay]
\node[text width=8cm, fill=black,text=white] {\shapepar{\circleshape} \inserttitle\par}; % <- not working
\end{tikzpicture}}

\title{Some title with variable length
x x x x x x x x x x x
very very long
very very long
very very long
very very long
very very long
}
\begin{document}


\maketitle

\begin{frame}
\shapepar{\circleshape} \huge\inserttitle % <- working fine here
\end{frame}
\end{document}