Tikz：一个节点中有两条线？

Question

我怎样才能在一个\tikz节点中有 2 条线？例如，假设我想要：

A1

+

A2

在第一个节点中，在椭圆内。我该如何实现呢？

\documentclass[10pt]{beamer}

\usepackage{tikz}
\usepackage{amsmath}
\usetikzlibrary{arrows,shapes,calc}
\tikzset{every picture/.append style={remember picture},
na/.style={baseline=-.5ex}}
\everymath{\displaystyle}
\usepackage[english]{babel}
\usepackage{amsthm}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{setspace}
\usepackage{color}
\usepackage{subfiles}
\usepackage{graphicx}


\usepackage{pgfplots}
\usepgfplotslibrary{dateplot}

\begin{document}

\begin{frame}
\begin{equation*}
  \tikz[baseline]{
        \node[fill=red!20, ellipse,anchor=base] (t2)
        {A1};
    } 
     \quad 
  \tikz[baseline]{
        \node[fill=green!20, ellipse,anchor=base] (t4)
        {B};
    } 
    \quad
    \tikz[baseline]{
        \node[fill=purple!20, ellipse,anchor=base] (t5)
        {C};
    } 
    \quad
    \tikz[baseline]{
        \node[fill=brown!20, ellipse,anchor=base] (t6)
        {D};
    } 
   \end{equation*}
\bigskip


\centering\tikz[na]\node(n3)[fill=blue!20,anchor=base]{mixture};


\begin{tikzpicture}[overlay]
     \path[->]<1-> (t2.south) edge [out=270,in=90] (n3);
     \path[->]<1-> (t5.south) edge [out=270,in=90] (n3);
     \path[->]<1-> (t4.south) edge [out=270,in=90](n3);
     \path[->]<1-> (t6.south) edge [out=270,in=90](n3);
\end{tikzpicture}

\end{frame}

\end{document}

Answer 1

您可以使用\\添加新行以及align如下规范 align=center：

\tikz[baseline]{
    \node[fill=red!20, ellipse,anchor=base, align=center] (t2)
    {A1 \\ + \\ A2};
} 

代码：

\documentclass[10pt]{beamer}

\usepackage{tikz}
\usepackage{amsmath}
\usetikzlibrary{arrows,shapes,calc}
\tikzset{every picture/.append style={remember picture},
na/.style={baseline=-.5ex}}
\everymath{\displaystyle}
\usepackage[english]{babel}
\usepackage{amsthm}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{setspace}
\usepackage{color}
\usepackage{subfiles}
\usepackage{graphicx}


\usepackage{pgfplots}
\usepgfplotslibrary{dateplot}

\begin{document}

\begin{frame}
\begin{equation*}
  \tikz[baseline]{
        \node[fill=red!20, ellipse,anchor=base, align=center] (t2)
        {A1 \\ + \\ A2};
    } 
     \quad 
  \tikz[baseline]{
        \node[fill=green!20, ellipse,anchor=base] (t4)
        {B};
    } 
    \quad
    \tikz[baseline]{
        \node[fill=purple!20, ellipse,anchor=base] (t5)
        {C};
    } 
    \quad
    \tikz[baseline]{
        \node[fill=brown!20, ellipse,anchor=base] (t6)
        {D};
    } 
   \end{equation*}
\bigskip


\centering\tikz[na]\node(n3)[fill=blue!20,anchor=base]{mixture};


\begin{tikzpicture}[overlay]
     \path[->]<1-> (t2.south) edge [out=270,in=90] (n3);
     \path[->]<1-> (t5.south) edge [out=270,in=90] (n3);
     \path[->]<1-> (t4.south) edge [out=270,in=90](n3);
     \path[->]<1-> (t6.south) edge [out=270,in=90](n3);
\end{tikzpicture}

\end{frame}

\end{document}