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我怎样才能使森林树木垂直居中？

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我怎样才能使森林树木垂直居中？

我想排版

在此处输入图片描述

因此，我写道（推导https://tex.stackexchange.com/a/302713/82730）

\documentclass[a4size]{article}
\usepackage{microtype}
\usepackage[T1]{fontenc}
\usepackage{adjustbox}
% forest
\usepackage{forest}
% parsing tree
\forestset{
  declare toks={wff}{},
  declare toks={connective}{},
  declare dimen register={parsing tree sep},
  parsing tree sep=7.5pt,
  parsing tree/.style={
    % append the current root to a new phantom root.
    for root'={
      replace by={[,phantom,append=!last dynamic node]}
    },
    for tree={
      math content,
      parent anchor=children,
      child anchor=parent,
      inner sep=0pt,
      if n children=1{!first.before packing=calign with current edge}{},
      delay={
        content=\circ,
        insert before/.wrap pgfmath arg={
          [##1,no edge,math content,anchor=base east, before computing xy={
            s/.pgfmath={s("!n")-parsing_tree_sep}}]
        }{wff},
        if connective={}{connective/.option=wff}{},
        insert after/.wrap pgfmath arg={
          [##1,no edge,math content,anchor=base west, before computing xy={
            s/.pgfmath={s("!p")+parsing_tree_sep}}]
        }{connective}
      }
    }
  },
  default preamble={parsing tree,baseline}
}
\begin{document}
\begin{center}
  \fbox{
    \begin{adjustbox}{valign=M}
      \begin{forest}
        [,wff=1,connective=\chi]
      \end{forest}
      \qquad
      \begin{forest}
        [,wff=m+3,connective=\neg [,wff=m,connective=\chi]]
      \end{forest}
      \qquad
      \begin{forest}
        [,wff=m+n+3,connective=\neg [,wff=m,connective=\chi]
        [,wff=n,connective=\chi]]
      \end{forest}
    \end{adjustbox}
  }
\end{center}
\end{document}

呈现为

在此处输入图片描述

左侧的树未垂直居中，但它位于顶部。如何使树垂直居中？

答案1

根据定义，只有一个框，没有其他对齐参考，因此所有树都是顶部对齐的。选择将每棵树放在单独的框上，并选择中间对齐，即M垂直中心（高度和深度相等），我们得到了所需的结果。类似于：

\begin{adjustbox}{valign=M} <content> \end{adjustbox}\qquad\begin{adjustbox}{valign=M} <content> \end{adjustbox}\qquad\begin{adjustbox}{valign=M} <content> \end{adjustbox}

以下是我：

\documentclass[a4size]{article}
\usepackage{microtype}
\usepackage[T1]{fontenc}
\usepackage{adjustbox}
% forest
\usepackage{forest}
% parsing tree
\forestset{
  declare toks={wff}{},
  declare toks={connective}{},
  declare dimen register={parsing tree sep},
  parsing tree sep=7.5pt,
  parsing tree/.style={
    % append the current root to a new phantom root.
    for root'={
      replace by={[,phantom,append=!last dynamic node]}
    },
    for tree={
      math content,
      parent anchor=children,
      child anchor=parent,
      inner sep=0pt,
      if n children=1{!first.before packing=calign with current edge}{},
      delay={
        content=\circ,
        insert before/.wrap pgfmath arg={
          [##1,no edge,math content,anchor=base east, before computing xy={
            s/.pgfmath={s("!n")-parsing_tree_sep}}]
        }{wff},
        if connective={}{connective/.option=wff}{},
        insert after/.wrap pgfmath arg={
          [##1,no edge,math content,anchor=base west, before computing xy={
            s/.pgfmath={s("!p")+parsing_tree_sep}}]
        }{connective}
      }
    }
  },
  default preamble={parsing tree,baseline}
}
\begin{document}
\begin{center}
  \fbox{
    \begin{adjustbox}{valign=M}
      \begin{forest}
        [,wff=1,connective=\chi]
      \end{forest}
    \end{adjustbox}
      \qquad
    \begin{adjustbox}{valign=M}
      \begin{forest}
        [,wff=m+3,connective=\neg [,wff=m,connective=\chi]]
      \end{forest}
    \end{adjustbox}
      \qquad
    \begin{adjustbox}{valign=M}
      \begin{forest}
        [,wff=m+n+3,connective=\neg [,wff=m,connective=\chi]
        [,wff=n,connective=\chi]]
      \end{forest}
    \end{adjustbox}
  }
\end{center}
\end{document}

其他方法涉及使用表格格式。例如：

\begin{tabular}{m{0.25\textwidth}m{0.25\textwidth}m{0.25\textwidth}@{}m{0pt}@{}}
  \begin{forest}
    [,wff=1,connective=\chi]
  \end{forest}
  &
  \begin{forest}
    [,wff=m+3,connective=\neg [,wff=m,connective=\chi]]
  \end{forest}
  &
  \begin{forest}
    [,wff=m+n+3,connective=\neg [,wff=m,connective=\chi]
    [,wff=n,connective=\chi]]
  \end{forest}
  &
\end{tabular}

答案2

你不需要不同的盒子等。你只需要移除baseline并使用 TikZ 的baseline选项将树垂直居中。例如，

\documentclass[]{article}
\usepackage{microtype}
\usepackage[T1]{fontenc}
\usepackage{adjustbox}
% forest
\usepackage{forest}
% parsing tree
\forestset{
  declare toks={wff}{},
  declare toks={connective}{},
  declare dimen register={parsing tree sep},
  parsing tree sep=7.5pt,
  parsing tree/.style={
    % append the current root to a new phantom root.
    for root'={
      replace by={[,phantom,append=!last dynamic node]}
    },
    for tree={
      math content,
      parent anchor=children,
      child anchor=parent,
      inner sep=0pt,
      if n children=1{!first.before packing=calign with current edge}{},
      delay={
        content=\circ,
        insert before/.wrap pgfmath arg={
          [##1,no edge,math content,anchor=base east, before computing xy={
            s/.pgfmath={s("!n")-parsing_tree_sep}}]
        }{wff},
        if connective={}{connective/.option=wff}{},
        insert after/.wrap pgfmath arg={
          [##1,no edge,math content,anchor=base west, before computing xy={
            s/.pgfmath={s("!p")+parsing_tree_sep}}]
        }{connective}
      }
    },
    /tikz/baseline=(current bounding box.center)
  },
  default preamble={parsing tree}
}
\begin{document}
\begin{center}
  \fbox{
    \begin{adjustbox}{valign=M}
      \begin{forest}
        [,wff=1,connective=\chi]
      \end{forest}
      \qquad
      \begin{forest}
        [,wff=m+3,connective=\neg [,wff=m,connective=\chi]]
      \end{forest}
      \qquad
      \begin{forest}
        [,wff=m+n+3,connective=\neg [,wff=m,connective=\chi]
        [,wff=n,connective=\chi]]
      \end{forest}
    \end{adjustbox}
  }
\end{center}
\end{document}

无盒子

请注意，这a4size不是一个有效的选项，因此我将其删除，因为它没有区别。也许你的意思是a4paper？在这种情况下，你应该确保geometry使用标准类加载类似的东西。

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