与 tikzmark 一起使用时 TikZ 输出不正确

Question

考虑以下 MWE。代码\mypic在两个节点之间定位一条线。当我尝试使用\mypic该tikzmark库时，线的定位不正确。为什么会发生这种情况，我该如何解决？

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{tikzmark,positioning,calc}
\NewDocumentCommand{\markpic}{m}{\tikz[remember picture]{\node[overlay,above=of pic cs:#1]{\mypic};}}
\NewDocumentCommand{\mypic}{}{
\begin{tikzpicture}
\node[circle=3pt,fill] at (0,0) {};
\draw[] (-.5,-.5) -- (.5,-.5);
\node[circle=3pt,fill] at (0,-1) {};
\end{tikzpicture}
}
\begin{document}

The diagram \tikzmark{C} above is incorrect.
\markpic{C}
\bigskip

The diagram below is correct.
\bigskip


\mypic

\end{document}

Answer 1

不应嵌套tikzpictures。通过将 atikzpicture放入另一个节点中，tikzpicture您就是在这样做。如果您将内部存储tikzpicture在一个盒子中，那么您是安全的。或者，您可以使用 a pic，但盒子更快。

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{tikzmark,positioning,calc}
\NewDocumentCommand{\markpic}{m}{\tikz[remember picture]{\node[overlay,above=of pic cs:#1]{\mypic};}}
\newsavebox\mypicbox
\sbox\mypicbox{\begin{tikzpicture}
    \node[circle=3pt,fill] at (0,0) {};
    \draw[] (-.5,-.5) -- (.5,-.5);
    \node[circle=3pt,fill] at (0,-1) {};
    \end{tikzpicture}}
\NewDocumentCommand{\mypic}{}{\usebox\mypicbox}
\begin{document}

The diagram \tikzmark{C} above is incorrect.
\markpic{C}
\bigskip

The diagram below is correct.
\bigskip


\mypic

\end{document}

如果您确实需要嵌套tikzpictures，则需要采取预防措施，确保内部tikzpicture不使用环境键的某些键。在这种情况下，问题是above，它将锚点设置为south。因此圆圈似乎被置换了。或者，您可以避免使用节点作为圆圈，而只填充一些圆圈。（在节点中，键circle是 的快捷方式shape=circle，它不带参数，因此与此上下文中circle=3pt的相同circle。您可以通过键设置半径inner sep。）

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{tikzmark,positioning,calc}
\NewDocumentCommand{\markpicA}{m}{\tikz[remember picture]{\node[overlay,above=of pic cs:#1]{\mypicA};}}
\NewDocumentCommand{\markpicB}{m}{\tikz[remember picture]{\node[overlay,above=of pic cs:#1]{\mypicB};}}
\NewDocumentCommand{\mypicA}{}{\begin{tikzpicture}[nodes={anchor=center}]
\node[circle,fill] at (0,0) {};% circle does not options, so "3pt" can be dropped
\draw[] (-.5,-.5) -- (.5,-.5);
\node[circle,fill] at (0,-1) {};
\end{tikzpicture}}

\NewDocumentCommand{\mypicB}{}{\begin{tikzpicture}
    \fill[radius=3pt]  (0,0) circle; 
    \draw[] (-.5,-.5) -- (.5,-.5);
    \fill[radius=3pt]  (0,-1) circle; 
    \end{tikzpicture}}
    
\begin{document}

The diagram \tikzmark{C} above is now correct.
\markpicA{C}
\bigskip

The diagram below is correct.
\bigskip


\mypicA


\vspace{4em}

The diagram \tikzmark{D} above is now correct.
\markpicB{D}
\bigskip

The diagram below is correct.
\bigskip


\mypicB

\end{document}