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如何在节点旁边添加文本并修剪（剪切）树的各个部分？

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如何在节点旁边添加文本并修剪（剪切）树的各个部分？

我在如何将文本与节点对齐以及如何修剪树方面遇到了问题。到目前为止，我有以下代码，请忽略错误，我不熟悉 TikZ 或 LaTeX。

\usepackage{tikz} % Flow chart
\usetikzlibrary{shapes,arrows,positioning,calc,chains}
\usepackage{float, subcaption}

\begin{document}
\tikzstyle{test} = [rectangle, fill=white!20, 
text width=0.1em, rounded corners, minimum height=8em]

\tikzset{
treenode/.style = {align=center, inner sep=0pt, text centered,
font=\sffamily},
arn_n/.style = {treenode, circle, black, font=\sffamily, draw=black,
fill=white, text width=1.5em},% arbre rouge noir, noeud noir
arn_r/.style = {treenode, circle, black, draw=black, 
text width=1.5em},% arbre rouge noir, noeud rouge
arn_x/.style = {treenode, rectangle, draw=black,
minimum width=0.5em, minimum height=0.5em}% arbre rouge noir, nil
}

\begin{figure}[ht]
    \centering 
    \begin{subfigure}[b]{0.26\textwidth}
            \centering
\begin{tikzpicture}[->,>=stealth',level/.style={sibling distance = 3cm/#1, 
level distance = 1.5cm},baseline=(current bounding box.center)] 

\node [arn_n] {33}
child{ node [arn_r] {15}                   
}
child{ node [arn_r] {47}
    }
; 
\end{tikzpicture}
            \caption{}
    \end{subfigure}%
    \begin{subfigure}[b]{0.20\textwidth}
    \centering
         \begin{tikzpicture}
% Place nodes
\node [test] (empty) { } ;
\node [right of=empty, node distance=2cm] (empty1) {}  ;               
  % Draw edges
\path [line] (empty) -- (empty1);
\end{tikzpicture}
 \end{subfigure}  
 \begin{subfigure}[b]{0.26\textwidth}

  \centering\begin{tikzpicture}[->,>=stealth',level/.style={sibling distance = 3cm/#1,
level distance = 1.5cm}, baseline=(current bounding box.center)] 
\node [arn_n] {33}
child{ node [arn_r] {15}                   
   }
child{ node [arn_r] {47}
    }
; 
\end{tikzpicture} 
   \caption{}
    \end{subfigure}   
   \caption{Pruned by infeasibility} \label{fig:3}
\end{figure}

这给了我以下信息：

现在我想得到这样的结果：

我想如何在节点旁边添加文本

我想在节点旁边添加文本，以便我可以说明上限和下限。我还想剪切/修剪树的部分。

我希望有人能帮帮忙。

此致

答案1

作为起点：

\documentclass{article}
\usepackage{tikz} % Flow chart
\usetikzlibrary{arrows, calc, positioning}
\usepackage{float, subcaption}

\begin{document}
    \begin{figure}[ht]
\tikzset{
    every label/.append style = {label distance=1pt, inner sep=1pt, align=left},
    base/.style = {draw,
                   inner sep=1pt, minimum size=5mm, font=\sffamily},
   arn_c/.style = {base, circle, fill=#1},% arbre rouge noir, noeud noir
   arn_c/.default = white,
   arn_r/.style = {base, rectangle, draw, fill=#1},% arbre rouge noir, nil
   arn_r/.default = white,
        }
    \centering
    \begin{subfigure}[b]{0.3\textwidth}
\centering
    \begin{tikzpicture}[->,>=stealth',
level/.style={sibling distance = 22mm,
level distance = 1.5cm},
                    ]
\node (a) [arn_c,label={right:$\alpha=3$}] {33}
    child{ node (b) [arn_c] {15}}
    child{ node (c) [arn_c] {47}}
    ;
\path   (a) -- node [sloped,label={[font=\footnotesize]60:$\beta$ cut}] {$\|$} (c);
\end{tikzpicture}
            \caption{}
    \end{subfigure}\quad
         \begin{tikzpicture}[baseline=-17mm]
\draw  (0,0) -- (2,0);
    \end{tikzpicture}\quad
     \begin{subfigure}[b]{0.3\textwidth}
\centering
    \begin{tikzpicture}[->,>=stealth',
level/.style={sibling distance = 22mm,
level distance = 1.5cm},
                    ]
\node [arn_c,label={[blue]left:$\alpha=3$}] {33}
    child{ node [arn_c] {15}}
    child{ node [arn_c] {47}}
    ;
\end{tikzpicture}
   \caption{}
    \end{subfigure}
   \caption{Pruned by infeasibility} 
\label{fig:3}
    \end{figure}
\end{document}

在此处输入图片描述

如果您喜欢在给定的链接上绘制图像中显示的树，只需添加具有所需节点样式的更多子节点，然后对于旁边的文本使用标签，就像上面的 MWE 对根节点所做的那样。

编辑：对于多行标签，您需要添加align=...到样式的定义中label。例如，如果大多数标签位于字体大小为的节点的右侧\tiny，则

every label/.append style = {label distance=1pt, inner sep=1pt, 
                             align=left, font=\tiny}, % <-- added

例外情况请本地更改此设置。例如

\path   (a) -- node [sloped,label={[font=\small]60:$\beta$ cut}] {$\|$} (c);

现在，这两个例子都在 MWE 中被考虑，并且出现在树的图像中。

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