tikzpicture 中节点之间的水平箭头

Question

我有以下图片：

\documentclass[preview,border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}

\begin{document}

\begin{center}
  \begin{small}
    \begin{tikzpicture} [label distance=5pt]
      \tikzstyle{every node}=[font=\small] %
      \tikzstyle{every label}=[text width=2.3cm, align=center] %
      \tikzstyle{mechanism}=[draw, thick, minimum height=4cm, text
      width=2.3cm, fill=lightgray] %
      \tikzstyle{motivation}=[draw, thick, right=of n3, text width=1.6cm,
      align=center] %

      \node (n1) [align=center, text width=1.8cm] {Cues in the environment}; %
      \node (n2) [mechanism, right=of n1, align=center,
      label={above:Acquisition mechanism}] {infer contents of norms \\[3em]
        identify norm-related behavior}; %
      \node (n3) [mechanism, right=of n2, align=left,
      label={above:Implementation mechanism}] {norm database\\
        $n_{1} \cdots\cdots\cdots$\\ $n_{2} \cdots\cdots\cdots$\\
        $n_{3} \cdots\cdots\cdots$\\ $\phantom{n_{3}} \cdots\cdots\cdots$\\
        $n_{z} \cdots\cdots\cdots$\smallskip\\ norm-related\\ reasoning\\
        capacity}; %
      \node (n4) [motivation, yshift=1.2cm] {compliance motivation} ; %
      \node (n5) [motivation, yshift=-1.2cm] {punishment motivation} ; %
      \path[->,thick] (n1) edge (n2) (n2) edge (n3); %
      \path[->,thick] (n3) edge (n4) (n3) edge (n5); %
    \end{tikzpicture}
  \end{small}
\end{center}
\end{document}

输出：

我希望最右边的两个箭头是水平的，即从节点 (n3) 水平指向 (n4) 和 (n5) 的西锚点。我该如何实现？

Answer 1

尝试：

\draw [->,thick] (n3.east|-n4.west) -- (n4.west);
\draw [->,thick] (n3.east|-n5.west) -- (n5.west);

看13.3.1 垂直线的交点 来自 TikZ 和 PGF 手册。

Answer 2

|-将绘制一条仅由垂直线段和水平线段组成的线。起始处的垂直线段将消失在节点的边界后面，因此只有水平线段可见。

\documentclass[preview,border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}

\begin{document}

\begin{center}
  \begin{small}
    \begin{tikzpicture} [label distance=5pt]
      \tikzstyle{every node}=[font=\small] %
      \tikzstyle{every label}=[text width=2.3cm, align=center] %
      \tikzstyle{mechanism}=[draw, thick, minimum height=4cm, text
      width=2.3cm, fill=lightgray] %
      \tikzstyle{motivation}=[draw, thick, right=of n3, text width=1.6cm,
      align=center] %

      \node (n1) [align=center, text width=1.8cm] {Cues in the environment}; %
      \node (n2) [mechanism, right=of n1, align=center,
      label={above:Acquisition mechanism}] {infer contents of norms \\[3em]
        identify norm-related behavior}; %
      \node (n3) [mechanism, right=of n2, align=left,
      label={above:Implementation mechanism}] {norm database\\
        $n_{1} \cdots\cdots\cdots$\\ $n_{2} \cdots\cdots\cdots$\\
        $n_{3} \cdots\cdots\cdots$\\ $\phantom{n_{3}} \cdots\cdots\cdots$\\
        $n_{z} \cdots\cdots\cdots$\smallskip\\ norm-related\\ reasoning\\
        capacity}; %
      \node (n4) [motivation, yshift=1.2cm] {compliance motivation} ; %
      \node (n5) [motivation, yshift=-1.2cm] {punishment motivation} ; %
      \path[->,thick] (n1) edge (n2) (n2) edge (n3); %
      \draw[->,thick] (n3.east) |- (n4);
      \draw[->,thick] (n3.east) |- (n5);
%      \path[->,thick] (n3) edge (n4) (n3) edge (n5); %
    \end{tikzpicture}
  \end{small}
\end{center}
\end{document}