如何在 tikz-qtree 中指定分支位置？

Question

使用tikz-qtree，两个分支均来自 'S.south'（左图）。如何像右图一样手动（或自动）指定这些分支位置？

\documentclass{standalone}

\usepackage{tikz}
\usepackage{tikz-qtree}
\usetikzlibrary{positioning}

\begin{document}
\begin{tikzpicture}[every node/.style = {draw, rectangle}]
  % using tikz-qtree: both branches are from "S.south"
  \Tree [.S [.NP ]
        [.VP ]
    ]

  % desired: both branches are not from ''s.south''
  \begin{scope}[xshift = 2.5cm]
    \node (s) {S};
    \node (np) [below left = 0.50cm and 0.05cm of s] {NP};
    \node (vp) [below right = 0.50cm and 0.05cm of s] {VP};
    \draw (s) to (np);
    \draw (s) to (vp);
  \end{scope}
\end{tikzpicture}
\end{document}

Answer 1

我发现

edge from parent/.style= {draw, 
     edge from parent path = {(\tikzparentnode) -- (\tikzchildnode)}}

作品。

\documentclass{standalone}

\usepackage{tikz}
\usepackage{tikz-qtree}
\usetikzlibrary{positioning}

\begin{document}
\begin{tikzpicture}[every node/.style = {draw, rectangle},
  edge from parent/.style= { % added code
    draw, edge from parent path = {(\tikzparentnode) -- (\tikzchildnode)}},]
  % using tikz-qtree
  \Tree [.S [.NP ]
        [.VP ]
    ]

  % desired: both branches do not come from ''s.south''
  \begin{scope}[xshift = 2.5cm]
    \node (s) {S};
    \node (np) [below left = 0.50cm and 0.05cm of s] {NP};
    \node (vp) [below right = 0.50cm and 0.05cm of s] {VP};
    \draw (s) to (np);
    \draw (s) to (vp);
  \end{scope}
\end{tikzpicture}
\end{document}