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在箭头上写代码

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在箭头上写代码

我正在尝试在节点之间的箭头上编写代码。理想情况下，我希望代码位于箭头的左侧（或右侧）和中间。有没有办法实现这一点？

\documentclass[11pt,a4paper,oneside]{article}
\usepackage[italian]{babel}
\usepackage[utf8]{inputenc}
\usepackage{euscript}
\usepackage{amsfonts}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{array}
\usepackage{algorithm}
\usepackage{algorithmic}
\usepackage{centernot}
\usepackage{mathtools}
\usepackage{color}
\usepackage{xcolor}
\usepackage{enumitem}
\usepackage{bm}
\usepackage{hyperref}
\usepackage{pgf}
\usepackage{tikz}
\usetikzlibrary{arrows,automata}

\begin{document}

\begin{figure}[H]
        \begin{tikzpicture}[>=stealth',shorten >=1pt,auto,node distance=2.8 cm, scale = 1, transform shape]

    \node[state](A){$n_0$};
    \node[state](B)[below of=A]{$n_1$};
    \node[state](C)[below left of=B]{$n_2$};
    \node[state](D)[below right of=B]{$n_3$};

    \path[->](A) edge [below] node [align=center] {} (B)
             (B) edge [below] node [align=left] {$\text{\texttt{j < inputExpr.length()}}$} (C)
             (B) edge [below] node [align=left] {$\text{\texttt{j >= inputExpr.length()}}$} (D);

        \end{tikzpicture}
\end{figure}

\end{document}

答案1

您应该增加节点之间的距离，然后应用于sloped节点，以便它们遵循箭头和较小的字体。

midway相当于pos=0.5。如果你想改变节点放置在箭头的哪一侧，你可以添加above或 ，below如下所示：

\node [narrow, above] ...

这样上面就添加到了narrow中定义的（节点箭头）节点样式\tikzset。

输出

在此处输入图片描述

代码

\documentclass[11pt,a4paper,oneside]{article}
\usepackage[italian]{babel}
\usepackage[utf8]{inputenc}
\usepackage{euscript}
\usepackage{amsfonts}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{array}
\usepackage{algorithm}
\usepackage{algorithmic}
\usepackage{centernot}
\usepackage{mathtools}
\usepackage{color}
\usepackage{xcolor}
\usepackage{enumitem}
\usepackage{bm}
\usepackage{hyperref}
\usepackage{pgf}
\usepackage{tikz}
\usetikzlibrary{arrows,automata}

\tikzset{
    narrow/.style={sloped, font=\scriptsize, midway}
}

\begin{document}

\begin{figure}[H]
        \begin{tikzpicture}[>=stealth',shorten >=1pt,auto,node distance=5 cm, scale = 1, transform shape]

    \node[state](A){$n_0$};
    \node[state](B)[below of=A]{$n_1$};
    \node[state](C)[below left of=B]{$n_2$};
    \node[state](D)[below right of=B]{$n_3$};

    \path[->](A) edge [below] node [align=center] {} (B)
             (B) edge [below] node [narrow] {$\text{\texttt{j < inputExpr.length()}}$} (C)
             (B) edge [below] node [narrow] {$\text{\texttt{j >= inputExpr.length()}}$} (D);

        \end{tikzpicture}
\end{figure}
\end{document}

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