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tcolorbox 海报：在背景中绘制一个适合的节点

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tcolorbox 海报：在背景中绘制一个适合的节点

我正在尝试使用 tcolorbox 的海报库在背景中绘制一个合适的节点。不幸的是，它没有按预期工作，因为绘图在上面。我尝试使用图层，但它不起作用。

在此处输入图片描述

\documentclass[tikz]{standalone}
\usepackage[many,poster]{tcolorbox}
\usepackage{tikz}
\usetikzlibrary{fit}

\begin{document}
\begin{tcbposter}[
  poster = {
    height=5cm,
    spacing=10mm,
    columns=3,
    rows=3,
  },
  coverage={
    overlay={
      % This does not work because there is a strange
      % shift...
      % \node[fit=(TCBPOSTER@A)(TCBPOSTER@B),inner sep=3mm,draw=red,fill=red!50!white,opacity=.7] {};
    }
  }
  ]
  \posterbox{name=A,column=2,row=1}{$A$}
  \posterbox{name=B,column=2,row=2}{$B$}
  \posterbox{name=C,column=3,row=2}{$C$}
  \draw [->] (TCBPOSTER@A) -- (TCBPOSTER@B);
  \draw [->] (TCBPOSTER@C) -- (TCBPOSTER@B);
  \node[fit=(TCBPOSTER@A)(TCBPOSTER@B),inner sep=3mm,draw=red,fill=red!50!white,opacity=.7] {};
  % Bonus if you can make this arrow appear completely without
  % manually tweaking coverage/right=2cm.
  \draw[->] ([email protected]) -- ++(2cm,0cm);
\end{tcbposter}%
\end{document}

答案1

回答主要问题很简单：在背景层上添加适合节点。

\documentclass{standalone}
\usepackage[many,poster]{tcolorbox}
\usepackage{tikz}
\usetikzlibrary{fit,backgrounds}
\begin{document}
\begin{tcbposter}[
  poster = {
    height=5cm,
    spacing=10mm,
    columns=3,
    rows=3,
  },
  coverage={
    overlay={
      % This does not work because there is a strange
      % shift...
      %\node[fit=(TCBPOSTER@A)(TCBPOSTER@B),inner sep=3mm,draw=red,fill=red!50!white,opacity=.7] {};
    }
  }
  ]
  \posterbox{name=A,column=2,row=1}{$A$}
  \posterbox{name=B,column=2,row=2}{$B$}
  \posterbox{name=C,column=3,row=2}{$C$}
  \draw [->] (TCBPOSTER@A) -- (TCBPOSTER@B);
  \draw [->] (TCBPOSTER@C) -- (TCBPOSTER@B);
  \begin{scope}[on background layer]
   \node[fit=(TCBPOSTER@A)(TCBPOSTER@B),inner
  sep=3mm,draw=red,fill=red!50!white,opacity=.7] {};
  \end{scope}
  % Bonus if you can make this arrow appear completely without
  % manually tweaking coverage/right=2cm.
  \draw[->] ([email protected]) -- ++(2cm,0cm);
\end{tcbposter}%
\end{document}

在此处输入图片描述

我不明白奖励问题。如果保持大小不变​​，箭头应该如何放置？

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