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标记树节点（森林）中的边

tag-icon • tag-icon forest
标记树节点（森林）中的边

我有这棵树，想给边缘贴上标签，但一直不知道怎么做。有人能帮我解释一下怎么做吗？任何帮助我都会很感激。

\documentclass[12pt, tikz]{article}
\usepackage{answers}
\usepackage{setspace}
\usepackage{graphicx}
\usepackage{slashbox}
\usepackage{enumitem}
\usepackage[colorlinks]{hyperref}
\usepackage{multicol}
\usepackage{booktabs}
\usepackage{amsmath}
\usepackage{mathrsfs}
\usepackage[table,x11names]{xcolor}
\usepackage[margin=1in]{geometry}
\usepackage{float}
\usepackage{amsmath,amsthm,amssymb}
\usepackage[utf8]{inputenc}
\usepackage {tikz}
\usepackage{multicol}
\usetikzlibrary{trees}
\usepackage{tikz-timing}[2014/10/29]
\usetikztiminglibrary[rising arrows]{clockarrows}
\usetikzlibrary {positioning}
\usepackage{xcolor}
\definecolor {processblue}{cmyk}{0.96,0,0,0}
\usepackage{caption}
\usepackage{array}
\newcolumntype{?}{!{\vrule width 2pt}}
\usepackage[spanish, es-tabla]{babel}
\makeatletter
\renewcommand{\@seccntformat}[1]{}
\makeatother
\setlength\parindent{24pt}
\usepackage{forest}
\usetikzlibrary{arrows.meta}

 
\begin{document}
 
\begin{center}
\begin{forest}
for tree = {
    circle, draw, 
    minimum size=5em,
    inner sep=4pt,
%
    s sep=15mm,
    l sep=20mm,
    edge={-Straight Barb} % arrows head defined in 'arrows.meta'
            }
[ItemA
    [ItemB]
    [ItemC]
]
\end{forest}
\end{center}

答案1

使用edge label=并完成您需要的内容（位置、样式、内容）。 森林中的边缘标签

\documentclass{article}
\usepackage{forest}
\usetikzlibrary{arrows.meta}
\begin{document}
 
    \begin{center}
        \begin{forest}
            for tree = {
                circle, draw, 
                minimum size=5em,
                inner sep=4pt,
            %
                s sep=15mm,
                l sep=20mm,
                edge={-Straight Barb}, % arrows head defined in 'arrows.meta'
                        }
            [ItemA
                [ItemB,edge label={node[midway,left]{left}}]
                [ItemC,edge label={node[midway,sloped,above]{right}}]
            ]
        \end{forest}
    \end{center}
\end{document}

如果需要标记多个，则在声明中定义通用样式会很有用forest，如下所示：

V2

        \begin{center}
        \begin{forest}
            for tree = {
                circle, draw, 
                minimum size=5em,
                inner sep=4pt,
            %
                s sep=15mm,
                l sep=20mm,
                edge={-Straight Barb}, % arrows head defined in 'arrows.meta'
                EL/.style = {edge label={node[midway, fill=white, inner sep=2pt,
                                        anchor=center]{#1}},},
                        }
            [ItemA
                [ItemB,EL=left]
                [ItemC,EL=right]
            ]
        \end{forest}
    \end{center}

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