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可以停止节点链吗？

tag-icon • tag-icon tikz-chains
可以停止节点链吗？

例如图片：

在此处输入图片描述

可以用以下 MWE 绘制：

\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{chains, positioning}

\begin{document}
    \begin{tikzpicture}[
    node distance = 7mm and 7mm,
    start chain = going right,
base/.style = {draw, minimum size=7mm},
 box/.style = {base, on chain, join=by ->}
                        ]
\coordinate (a) at (0,-1);
\node (n1)  [box]   at (0,0) {A};
\node (n2)  [box]   {B};
\node (n3)  [box]   {C};
\node (n4)  [base]   at (a -| n2) {D};
\draw[red,->]   (n3) |- (n4);
\draw[red,->]   (n4) -| (n1);
    \end{tikzpicture}
\end{document}

现在，出于某种原因，我只想对节点有一个定义并再次绘制上述图像：

\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{chains, positioning}

\begin{document}  
    \begin{tikzpicture}[
    node distance = 7mm and 7mm,
    start chain = going right,
box/.style = {draw, minimum size=7mm,
              on chain, join=by ->}
                        ]
\coordinate (a) at (0,-1);
\node (n1)  [box]   at (0,0) {A};
\node (n2)  [box]   {B};
\node (n3)  [box]   {C};
\node (n4)  [box]   at (a -| n2) {D};
\draw[red,->]   (n3) |- (n4);
\draw[red,->]   (n4) -| (n1);
    \end{tikzpicture}
\end{document}

结果预期错误：

在此处输入图片描述

问题：是否可以说，上述 MWE 中的节点“D”不在链上？例如

\node (n4)  [box, suppress chain]   at (a -| n2) {D};

join类似地，它可以通过定义新的选项在链中的节点之间停止：

\tikzset{suppress join/.code={\def\tikz@after@path{}}}

并用作

\node (n4)  [box, suppress join]   at (a -| n2) {D};

我查看了 TikZ 文档，其中描述了chainin（第 5449 页），但没有找到任何具有相反操作的内容。

答案1

像这样吗？

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{chains, positioning}
\begin{document}
\makeatletter
\tikzset{
  suppress join/.code={\def\tikz@after@path{}},
  off chain/.code={\def\tikz@lib@on@chain{}}%
}
\makeatother
\begin{tikzpicture}[
  node distance = 7mm and 7mm,
  start chain = main going right,
  box/.style = {draw, minimum size=7mm, on chain, join=by ->}
  ]
  \coordinate (a) at (0,-1);
  \node (n1)  [box]   at (0,0) {A};
  \node (n2)  [box]   {B};
  \node (n3)  [box]   {C};
  \node (n4)  [suppress join, off chain, box]   at (a -| n2) {D};
  \draw[red,->]   (n3) |- (n4);
  \draw[red,->]   (n4) -| (n1);
\end{tikzpicture}
\end{document}

链下

请注意，这里的顺序很重要：off chain必须在 之前box。然后，如果您愿意，可以继续该链。

\begin{tikzpicture}[
  node distance = 7mm and 7mm,
  start chain = main going right,
  box/.style = {draw, minimum size=7mm, on chain, join=by ->}
  ]
  \coordinate (a) at (0,-1);
  \node (n1)  [box]   at (0,0) {A};
  \node (n2)  [box]   {B};
  \node (n3)  [box]   {C};
  \node (n4)  [suppress join, off chain, box]   at (a -| n2) {D};
  \node [box] {E};
  \draw[red,->]   (n3) |- (n4);
  \draw[red,->]   (n4) -| (n1);
\end{tikzpicture}

延续

但请注意，该chains库已被弃用。

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