森林树木、箱子和箭头

Question

我正在努力学习forest，但遇到了一些问题。

\documentclass{article}

\usepackage[linguistics]{forest}
\forestset{%
 pretty nice empty nodes/.style={
 for tree={
  calign=fixed edge angles,
  parent anchor=children,
  delay={if content={}{
      inner sep=0pt,
      edge path={\noexpand\path [\forestoption{edge}] (!u.parent anchor) -- (.children)\forestoption{edge label};}
    }{}}
  },
 }
}

\begin{document}

\begin{forest}
 [, pretty nice empty nodes
    [
        [X,name=x] 
        [Y,l=5mm,circle,dotted,draw,name=y] {\node[draw,fit=(y) (!us),rotate=135] {};}
    ] 
    [Z]
 ]
 \draw[->,dotted, thick] (y) to [out=south,in=south] (x); 
\end{forest}

\end{document}

我想要做的是：1）减少框的高度，包括 Z 和 Y；2）粗的非虚线箭头应该从框的底部开始。

非常感谢您的帮助！

Answer 1

像这样吗？

\documentclass[border=10pt,multi,tikz]{standalone}
\usepackage[linguistics]{forest}
\forestset{%
  pretty nice empty nodes/.style={
    for tree={
      calign=fixed edge angles,
      parent anchor=children,
      delay={
        if content={}{
          inner sep=0pt,
          edge path'={(!u.parent anchor) -- (.children)}
        }{},
      },
    },
  },
}
\begin{document}
\begin{forest}
  for tree={circle}
  [, pretty nice empty nodes
    [
        [X, name=x]
        [Y, l=5mm, circle, dotted, draw, name=y]
        {
          \draw [red] (y.west) -- (!us.north) -- (!us.east) -- (y.south) -- cycle ;
        }
    ]
    [Z]
 ]
 \draw[->,dotted, thick] (y) to [out=south,in=south] (x);
\end{forest}

\end{document}