使用TikZ从父节点和子节点之间的边绘制到新节点

Question

我正在尝试绘制一条边，该边从下图中的节点 A 和 B 之间的边开始，到新节点 J，如下所示。我能够从 B 和 C 之间的边到新节点 K 绘制一条边，但出于某种原因，我无法让到 J 的边看起来正确。

代码如下：

\documentclass{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
    [sibling distance=16em,level distance=8em, every node/.style={shape=rectangle,draw,align=center}]
    \tikzstyle{level 3}=[sibling distance=20em]
    \tikzstyle{level 4}=[sibling distance=8em] 
    
    \node (A){A}
        child{node(B){B}
            child{node{C}
                child{node{D}
                    child{node{E}}
                    child{node{F}}
                }
                child{node{G}
                    child{node{H}}
                    child{node{I}}
                }
            }
        };
    
    \path (A) -- node[right=7em] (J){J} (A-1) (J) edge (J-|A); 
    \path (B) -- node[right=7em] (K){K} (B-1) (K) edge (K-|B);   
\end{tikzpicture}
\end{document}

谢谢！

Answer 1

编辑：由于 OP 改变了问题...新的解决方案可以简单地从原始答案中得出：

尝试

\documentclass{standalone}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}[
        node distance = 7em,
        every node/.style={shape=rectangle,draw,align=center},
        sibling distance=16em,
        level distance=8em, 
        level 3/.style = {sibling distance=20em},
        level 4/.style = {sibling distance=8em}
                    ]
%
    \node (a) {A}
        child{node (b) {B}  % <---
            child{node (c) {C} % <---
                child{node{D}
                    child{node{E}}
                    child{node{F}}
                }
                child{node{G}
                    child{node{H}}
                    child{node{I}}
                }
            }
        };

\path (a) -- coordinate (j1)
        node[draw, right=7em] (j2) {J} (b)  (j2) edge[draw] (j1);
\path (b) -- coordinate (k1)
        node[draw, right=7em] (k2) {K} (c)  (k2) edge[draw] (k1);
\end{tikzpicture}
\end{document}

附录：forest如果你使用包， 代码会更加简单：

\documentclass[margin=5mm]{standalone}
\usepackage{forest}

\begin{document}
    \begin{forest}
for tree = {
% nodes
    draw,
% tree
    edge  = {-, semithick},
    s sep = 4em,
    l sep = 4em, 
            }
%
[A, name=a
    [B, name=b
        [C, name=c
            [D
                [E]
                [F]
            ]
            [G
                [H]
                [I]
            ]
        ]
    ]
]
\path (a) -- coordinate (j1) 
        node[draw, right=7em] (j2) {J} (b)  (j2) edge[draw] (j1);
\path (b) -- coordinate (k1)
        node[draw, right=7em] (k2) {K} (c)  (k2) edge[draw] (k1);
    \end{forest}
\end{document}