如何在 tikz 中更改 FSA 中状态的大小？

Question

我有以下 FSA：

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{automata,positioning,decorations.text,topaths,arrows.meta,decorations.pathmorphing,quotes}
\tikzstyle{every picture}+=[remember picture,inner xsep=0,inner ysep=0.25ex]

\begin{document}
\begin{tikzpicture}[shorten >=1pt,node distance=2.5cm,on grid,auto]
   \node[state,initial,accepting] (q_0)   {$q_0$};
   \node[state,accepting] (q_1) [right=of q_0] {$q_1$};
    \path[->]
    (q_0) edge  node [swap] {b} (q_1)
    (q_1) edge  [loop below] node {d} ();
\end{tikzpicture}

\end{document}

我想改变状态节点的大小，以便我可以容纳类似This is \\ the initial \\ state里面的东西q_0（而不是q_0）。

我还想使循环适当地变宽以适应更大的状态（如果它不能自动扩展的话）。

Answer 1

您可以添加align=center到\node选项中。循环将自动调整。如果您想调整节点中的字体大小，请添加font=\small（或您喜欢的任何大小）。

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{automata,positioning,decorations.text,topaths,arrows.meta,decorations.pathmorphing,quotes}
\tikzstyle{every picture}+=[remember picture,inner xsep=0,inner ysep=0.25ex]

\begin{document}
\begin{tikzpicture}[shorten >=1pt,node distance=2.5cm,on grid,auto]
   \node[state,initial,accepting,align=center] (q_0)   {This is\\the initial\\state};
   \node[state,accepting] (q_1) [right=of q_0] {$q_1$};
    \path[->]
    (q_0) edge  [loop below] node {b} (q_1)
    (q_0) edge   node [swap] {c} (q_1)
    (q_1) edge  [loop below] node {d} ();
\end{tikzpicture}

\end{document}

Answer 2

不要将\scriptsize尺寸增加太多。

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{
  automata,
  positioning,
  decorations.text,
  topaths,
  arrows.meta,
  decorations.pathmorphing,
  quotes
}
\tikzset{
  every picture/.append style={remember picture,inner xsep=0,inner ysep=0.25ex},
}

\begin{document}
\begin{tikzpicture}[shorten >=1pt,node distance=2.5cm,on grid,auto]
   \node[state,initial,accepting] (q_0)
     {\scriptsize\begin{tabular}{@{}c@{}}This is\\the initial \\ state\end{tabular}};
   \node[state,accepting] (q_1) [right=of q_0] {$q_1$};
   \path[->]
    (q_0) edge  node [swap] {b} (q_1)
    (q_1) edge  [loop below] node {d} ();
\end{tikzpicture}

\end{document}