Ti*k*Z，自动机：改变初始状态的装饰？

Question

我偏爱用指向状态的“>”（稍大一些）来标记自动机的初始状态。我发现“初始 -->”很让人分心。有什么方法可以更改默认值吗？

Answer 1

您可以减少initial distance并用来arrows.meta添加较大的箭头。

\documentclass[tikz,border=3mm]{standalone}
\usetikzlibrary{automata,arrows.meta}
\begin{document}
\begin{tikzpicture}[
    every initial by arrow/.style={-{Straight Barb[length=5pt,width=6pt]}},
    initial distance=0.01cm,initial text={}]
\node[state,initial] {$q_0$}; 
\end{tikzpicture}
\end{document}

Answer 2

这可能会让您感兴趣——来自 pgf 手册第 646 页的 decoration.markings 章节——

链接-->http://ctan.imsc.res.in/graphics/pgf/base/doc/pgfmanual.pdf

位置和颜色可以根据您的选择进行调整 - 这只是草稿

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{automata, decorations.shapes, shapes.geometric}

\begin{document}

\begin{tikzpicture}[>=latex, decoration={shape= isosceles triangle, shape 
  width=0.65cm, shape height=0.45cm,shape sep=0.75cm,shape backgrounds}]
  \node[state] (q_0) {$q_0$};
  \draw[decorate, fill=red] (-2cm,0)-- node[above]{start} (q_0);
  \draw [decorate, fill=red](1,0);
\end{tikzpicture}

\end{document}

Answer 3

设置every initial by arrow样式并修复scale和line width选项。

\documentclass[tikz]{standalone}
\usepackage{tikz}
\usetikzlibrary{automata, arrows.meta, positioning}
\begin{document}
\begin{tikzpicture}[initial text = {}, initial distance = {0.01mm},
     every initial by arrow/.style = { -{To[scale=2.0, line width=0.7pt]}  }]
%
        \node (q0) [state, accepting, initial] {$q_{0}$};
%
\end{tikzpicture}
\end{document}

看PGF/TikZ 手册了解更多箭头提示。