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使用森林和光束避免树中的跳跃节点

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使用森林和光束避免树中的跳跃节点

手册中有一些关于避免跳跃的内容，这里进行了解释避免投影机跳帧也一样。但我在树中的情况可能有所不同。有没有办法避免以下代码中两个图形之间的跳跃？

\documentclass{beamer}

\usepackage{forest}

% http://tex.stackexchange.com/questions/167690/presenting-a-forest-tree-from-bottom-to-top-in-beamer
% showing and hiding nodes and edges in forest
\tikzset{
    invisible/.style={opacity=0,text opacity=0},
    visible on/.style={alt=#1{}{invisible}},
    alt/.code args={<#1>#2#3}{%
      \alt<#1>{\pgfkeysalso{#2}}{\pgfkeysalso{#3}} % \pgfkeysalso doesn't change the path
    },
}
\forestset{
  visible on/.style={
    for tree={
      /tikz/visible on={#1},
      edge={/tikz/visible on={#1}}}}}

\newcommand{\sliste}[1]{%
\mbox{%
$\left\langle\mbox{\upshape\scshape #1}\right\rangle$}%
}

% specification for all trees, "default preamble" appends to existing specification.
% The version with apostrophe replaces it.
\forestset{default preamble'={
    for tree={align=center,parent anchor=south, child anchor=north,anchor=north,base=bottom},
    before drawing tree={
      sort by=y,
      for min={tree}{baseline}
    }
  }}


\forestset{
  declare dimen={child anchor yshift}{0pt},
  adjust childrens child anchors/.style={
    if n children>=2{
      before packing={
        tempdima/.max={max_y}{children},
        for children={
          child anchor yshift=tempdima()-max_y()
        },
      }
    }{}
  },
  default preamble={
    for tree={
      edge path'={(!u.parent anchor)--([yshift=\forestoption{child anchor yshift}].child anchor)},
      adjust childrens child anchors
    }
  },
}


\begin{document}

\frame{

\begin{forest}
[S
 [\alt<1>{XP}{NP1234}]
 [\alt<1>{YP}{NP1234}]
 [\alt<1>{ZP}{NP1234}]
 [\ldots, visible on=<1>]
 [{\alt<1>{H}{V} \sliste{ \alt<1>{XP}{NP}, \alt<1>{YP}{NP}, \alt<1>{ZP}{NP}\visible<1>{, \ldots} }}
   [{V \sliste{ NP, NP, NP }}, visible on=<1>,no edge]]]
\end{forest}

\pause

}


\end{document}

编辑：通过添加 1234 使 NPs 更长，以便跳跃更加明显。

答案1

这可能是解决问题的第一步。我添加了一个min width可以传递两个不同文本的键。是的，如果可以更改\alt为自动执行此操作会更好，但由于扩展问题，我无法做到这一点。（我甚至不知道我在与谁的扩展作斗争，beamer或者forest。）

\documentclass{beamer}

\usepackage{forest}

% http://tex.stackexchange.com/questions/167690/presenting-a-forest-tree-from-bottom-to-top-in-beamer
% showing and hiding nodes and edges in forest
\tikzset{
    invisible/.style={opacity=0,text opacity=0},
    visible on/.style={alt=#1{}{invisible}},
    alt/.code args={<#1>#2#3}{%
      \alt<#1>{\pgfkeysalso{#2}}{\pgfkeysalso{#3}} % \pgfkeysalso doesn't change the path
    },
}
\forestset{
  visible on/.style={
    for tree={
      /tikz/visible on={#1},
      edge={/tikz/visible on={#1}}}}}

\newcommand{\sliste}[1]{%
\mbox{%
$\left\langle\mbox{\upshape\scshape #1}\right\rangle$}%
}

% specification for all trees, "default preamble" appends to existing specification.
% The version with apostrophe replaces it.
\forestset{default preamble'={
    for tree={align=center,parent anchor=south, child anchor=north,anchor=north,base=bottom},
    before drawing tree={
      sort by=y,
      for min={tree}{baseline}
    }
  }}


\forestset{
  declare dimen={child anchor yshift}{0pt},
  adjust childrens child anchors/.style={
    if n children>=2{
      before packing={
        tempdima/.max={max_y}{children},
        for children={
          child anchor yshift=tempdima()-max_y()
        },
      }
    }{}
  },
  default preamble={
    for tree={
      edge path'={(!u.parent anchor)--([yshift=\forestoption{child anchor yshift}].child anchor)},
      adjust childrens child anchors
    }
  },
}


\begin{document}
\tikzset{min width/.style n args={2}{/utils/exec={\pgfmathparse{max(width("#1"),width("#2"))}
 \edef\mywidth{\pgfmathresult}},
 text width={\mywidth pt}}}
\frame{

\begin{forest}
[S
 [\alt<1>{XP}{NP1234},min width={XP}{NP1234}]
 [\alt<1>{YP}{NP1234},min width={YP}{NP1234}]
 [\alt<1>{ZP}{NP1234},min width={ZP}{NP1234}]
 [\ldots, visible on=<1>]
 [{\alt<1>{H}{V} \sliste{ \alt<1>{XP}{NP}, \alt<1>{YP}{NP}, \alt<1>{ZP}{NP}\visible<1>{, \ldots} }}
   [{V \sliste{ NP, NP, NP }}, visible on=<1>,no edge]]]
\end{forest}

\begin{tikzpicture}[overlay,remember picture] 
\draw[red] (current page.south west) grid (current page.north east); 
\end{tikzpicture}
\pause

}


\end{document}

在此处输入图片描述

红色网格仅用于引导视线。

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