tikz-cd嵌套tikzpicture错误中心锚点

Question

我想将 tikzpicture 放置在 tikz-cd 图的节点/单元中，然后在内部 tikzpicture 中绘制更多内容。但是，嵌套似乎会弄乱锚点center。

具体来说：在下面的 MWE 中，为什么蓝色圆圈没有正确地位于节点的中心？我该如何修复它？

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{cd}
\newcommand{\boxedBWithAnchors}{
  \begin{tikzpicture}[baseline=(B.base)]
    \node[draw=black!20] (B) {B};
    \draw[draw=black!20] (B.south west) to (B.north east);
    \draw[draw=black!20] (B.north west) to (B.south east);
    \draw[draw=blue] (B.center) circle (1pt);
  \end{tikzpicture}
}

\begin{document}
\,\boxedBWithAnchors
\begin{tikzcd}
\boxedBWithAnchors
\end{tikzcd}
\end{document}

Answer 1

问题是/tikz/commutative diagrams/every cell样式设置shape=asymmetrical rectangle没有将锚点居中。解决方案是在节点中再次center明确设置：shape=rectangle

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{cd}
\newcommand{\boxedBWithAnchors}{
  \begin{tikzpicture}[baseline=(B.base)]
    \node[shape=rectangle,draw=black!20] (B) {B};
    \draw[draw=black!20] (B.south west) to (B.north east);
    \draw[draw=black!20] (B.north west) to (B.south east);
    \draw[draw=blue] (B.center) circle (1pt);
  \end{tikzpicture}
}

\begin{document}
\,\boxedBWithAnchors
\begin{tikzcd}
\boxedBWithAnchors
\end{tikzcd}
\end{document}

Answer 2

我同意 egreg 的观点，绝对不会使用 nest tikzpicture。这也是不必要的。正如您所观察到的，rectangle如果要将其添加到单个单元格，还需要明确将形状设置为。（但是，这可以在交换图中通过添加|[draw=black!20,outer sep=0pt,shape=rectangle]|到单元格来完成。）我使用\pgfkeys{cross circle/.code args={#1|#2}{...来允许用户使用/.list键循环遍历多个单元格。还要注意，如果您想要在背景中使用十字，那么使用 会有一个更简单的解决方案path picture。（据我所知，append after command不允许您更改圆圈的颜色。）

\documentclass[border=3.14mm]{standalone}
\usepackage{tikz}
\usepackage{amsmath}
\usetikzlibrary{cd}
\newcommand{\boxedBWithAnchors}{
  \begin{tikzpicture}[baseline=(B.base)]
    \node[draw=black!20] (B) {B};
    \draw[draw=black!20] (B.south west) to (B.north east);
    \draw[draw=black!20] (B.north west) to (B.south east);
    \draw[draw=blue] (B.center) circle (1pt);
  \end{tikzpicture}
}
\pgfkeys{cross circle/.code args={#1|#2}{
\draw[black!20] 
 (\tikzcdmatrixname-#1-#2.north west) -- (\tikzcdmatrixname-#1-#2.south east);
\draw[black!20] 
 (\tikzcdmatrixname-#1-#2.south west) -- (\tikzcdmatrixname-#1-#2.north east);
\draw[draw=blue] (\tikzcdmatrixname-#1-#2.center) circle (1pt);}}

\begin{document}
\boxedBWithAnchors
\begin{tikzcd}[execute at end picture={\pgfkeys{cross circle={1|1}}
}]
|[draw=black!20,outer sep=0pt,shape=rectangle]|\text{B}
\end{tikzcd}
\end{document}