在系统发育树中，分支相互重叠

Question

我创建了以下闪米特语的系统发育树：

使用以下代码：

\documentclass{article}
\usepackage{tikz}
\usepackage{tikz-qtree}
\usepackage{forest}

\begin{document}

\begin{figure}[ht]
\centering
\begin{adjustbox}{width=1\textwidth}
\begin{forest}
for tree={
  font=\normalfont,
  minimum height=0.8cm,
  l sep+=15pt,
  inner sep=2pt,
  draw=none,
  fill=none,
  edge={draw=black, line width=0.5pt},
  anchor=north,
  child anchor=north,
  parent anchor=south,
  align=center,
  edge path={
    \noexpand\path[\forestoption{edge}]
      (!u.parent anchor) -- +(0,-8pt) -| (.child anchor)\forestoption{edge label};
  },
}
[\textsc{central-semitic} 
  [\textsc{arabic} 
    [Classical\\ /r/]
    [Levantine\\ /r/ /r\textsuperscript{ʕ}/]
    [Egyptian\\ /r/ /r\textsuperscript{ʕ}/]
  ]
  [\textsc{northwest-semitic} 
    [\textsc{aramaic} 
      [Biblical\\ /ɾ/]
      [Targumic\\ /ɾ/]
      [Syriac\\ /ɾ/]
      [{Jewish Babylonian}\\ /ɾ/]
      [\textsc{nena}\\ /ɾ/ /r/ /r\textsuperscript{ʕ}/ /ɻ/]
      [Neo-Mandaic\\ /r/ /ɹ/]
      [\d{T}uroyo-Mla\d{h}so\\ /r/]
      [\textsc{wna}\\ /r/]
    ]
    [\textsc{canaanite} 
      [Phoenician\\ /r/]
      [{Samaritan Hebrew}\\ /r/]
    ]
  ]
]
\end{forest}
\end{adjustbox}
\caption{Central-Semitic phylogeny with rhotics}
\label{fig:semitic_tree}
\end{figure}

\end{document}

我希望标有“阿拉伯语”的节点不要位于“亚拉姆语”分支上方，而是位于其左侧，并且其尖端与亚拉姆语和迦南语的尖端处于同一水平（基本上，树应该是超度量的）。我该如何实现？

Answer 1

您可以用值注释节点，tier以强制它们在树中处于同一级别。在这里，我向节点和节点添加了tier=aramaic（名称是任意的），以实现您想要的配置。（我还从序言中删除了它，因为它没有被使用，并添加了和 ​​。）aramaicarabictikz-qtreeadjustboxlibertine

\documentclass{article}
\usepackage{tikz}
\usepackage{forest}
\usepackage{adjustbox}
\usepackage{libertine} 


\begin{document}

\begin{figure}[ht]
\centering
\begin{adjustbox}{width=1\textwidth}
\begin{forest}
for tree={
  font=\normalfont,
  minimum height=0.8cm,
  l sep+=15pt,
  inner sep=2pt,
  draw=none,
  fill=none,
  edge={draw=black, line width=0.5pt},
  anchor=north,
  child anchor=north,
  parent anchor=south,
  align=center,
  edge path={
    \noexpand\path[\forestoption{edge}]
      (!u.parent anchor) -- +(0,-8pt) -| (.child anchor)\forestoption{edge label};
  },
}
[\textsc{central-semitic} 
  [\textsc{arabic},tier=aramaic
    [Classical\\ /r/]
    [Levantine\\ /r/ /r\textsuperscript{ʕ}/]
    [Egyptian\\ /r/ /r\textsuperscript{ʕ}/]
  ]
  [\textsc{northwest-semitic} 
    [\textsc{aramaic},tier=aramaic 
      [Biblical\\ /ɾ/]
      [Targumic\\ /ɾ/]
      [Syriac\\ /ɾ/]
      [{Jewish Babylonian}\\ /ɾ/]
      [\textsc{nena}\\ /ɾ/ /r/ /r\textsuperscript{ʕ}/ /ɻ/]
      [Neo-Mandaic\\ /r/ /ɹ/]
      [\d{T}uroyo-Mla\d{h}so\\ /r/]
      [\textsc{wna}\\ /r/]
    ]
    [\textsc{canaanite} 
      [Phoenician\\ /r/]
      [{Samaritan Hebrew}\\ /r/]
    ]
  ]
]
\end{forest}
\end{adjustbox}
\caption{Central-Semitic phylogeny with rhotics}
\label{fig:semitic_tree}
\end{figure}

\end{document}