tikz 树节点下方的重叠标签

Question

我是 Latex 的新手，我正在使用 tikz 包绘制一个简单的二叉树。我想将一个长问题放在一个节点下，但它与箭头重叠。这是我的代码：

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tikz}


\begin{document}
\tikzset {
    my_circle/.style = {circle, draw= black}
}
\begin{tikzpicture}[->, sibling distance=4cm, level distance = 4cm]
\node [label=below:{I need to put here a long question!}, my_circle]{1}
    child{node[my_circle] {2} edge from parent node[left] {yes}
    }
    child{node [my_circle]{3}
        child{node [my_circle] {6}
        edge from parent node [left] {yes}}
        child {node [my_circle]{7}
         edge from parent node[right] {no}}
    edge from parent node [right] {no}} 
;

\end{tikzpicture}
\end{document}

通过这样做我得到了这个结果：

我想要做的是在问题后启动箭头：

多谢！

Answer 1

欢迎光临！只是shorten各自的边缘。

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tikz}


\begin{document}
\tikzset {
    my_circle/.style = {circle, draw= black}
}
\begin{tikzpicture}[->, sibling distance=4cm, level distance = 4cm]
\node [label=below:{I need to put here a long question!}, my_circle]{1}
    child{node[my_circle] {2} edge from parent[shorten <=0.8cm] node[left] {yes}
    }
    child{node [my_circle]{3}
        child{node [my_circle] {6}
        edge from parent node [left] {yes}}
        child {node [my_circle]{7}
         edge from parent node[right] {no}}
    edge from parent[shorten <=0.8cm] node [right] {no}} 
;

\end{tikzpicture}
\end{document}

我建议改用forest。有了这个包，你可以说类似

where level=1{edge={shorten <=6mm}}{},

以便缩短该层级上所有边的边数。还有更多功能。而且语法更简单。

\documentclass{article}
\usepackage[edges]{forest}
\begin{document}
\begin{forest}
yes/.style={edge label={node[auto,pos=0.7,swap]{yes}}},
no/.style={edge label={node[auto,pos=0.7]{no}}},
where level=1{edge={shorten <=6mm}}{},
for tree={circle,draw,s sep+=2em,l sep+=3em}
[1,label=below:{I need to put here a long question!}
 [2,yes]
 [3,no
  [6,yes]
  [7,no]
 ]
]
\end{forest}
\end{document}