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如何画一条连接三角形两边的线

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如何画一条连接三角形两边的线

我想画一条线连接每个三角形的两条边。这条线应该连接 AB 和 BC。但是，我觉得很难。所以，你能帮我吗？谢谢

\documentclass[12pt,article]{elsarticle}
\usepackage{pgfplots}
\pgfplotsset{compat=1.11}

\begin{document}
\begin{figure}[!h]
    \begin{minipage}{0.5\textwidth}
        \centering
        \begin{tikzpicture}[font=\sffamily]
        \path (0,0) coordinate (A) (60:3) coordinate (B) (3,0) coordinate (C);
        \draw[thick,path picture={
            \foreach \X in {A,B,C}
            {\draw[line width=0.4pt] (\X);}}]   
        (A) node[left]{$A$} to[bend right=12] 
        (B) node[above right]{$B$} to[bend right=15] 
        (C) node[right]{$C$} to[bend right=20] cycle;
        %   \node at (barycentric cs:A=1,B=1,C=1) {$<180^\circ$};
        \end{tikzpicture}
        \caption{Triangle in a CAT(0) space}
        \label{fig:tri1}
    \end{minipage}\hspace{0.05cm}%\hfill
    \hspace{-0.12cm}
    \begin{minipage}{0.5\textwidth}
    \centering
    \begin{tikzpicture}[font=\sffamily]
    \path (0,0) coordinate (A) (60:3) coordinate (B) (3,0) coordinate (C);
    \draw [thick,path picture={
        \foreach \X in {A,B,C}
        {\draw[line width=0.4pt] (\X);}}] (A) node[left]{$A$} (B) node[above right]{$B$}    (C) node[right]{$C$} (0,0) --  (60:3) -- (3,0) -- cycle;
    \end{tikzpicture}
    \caption{Triangle in an Euclidean space}
    \label{fig:tri2}
    \end{minipage}%\hspace{0.05cm}%\hfill
\end{figure}
\end{document}

在此处输入图片描述

答案1

您可以coordinate在路径段中间添加名为 的坐标，例如，\draw (A) -- coordinate(b) (C);或在坐标和之间\draw (A) to[bend left] coordinate(b) (C);会有一个名为 的坐标。bAC

要在坐标旁边添加标签节点，您可以使用该label选项，例如“\draw（A）--coordinate [label = left：foo]（b）（C）;”

顺便说一下，在下面的代码中我减少了minipagesa 的宽度，并将水平空间改为\hfill。

在此处输入图片描述

\documentclass[12pt,article]{article}
\usepackage{tikz}
\begin{document}
\begin{figure}
    \begin{minipage}{0.45\textwidth}
        \centering
        \begin{tikzpicture}[font=\sffamily]
        \path (0,0) coordinate (A) (60:3) coordinate (B) (3,0) coordinate (C);
        \draw[thick]   
        (A) node[left]{$A$} to[bend right=12] coordinate[label=left:$a$] (a) 
        (B) node[above right]{$B$} to[bend right=15] coordinate[label=right:$b$] (b)
        (C) node[right]{$C$} to[bend right=20] coordinate (c) cycle;
        %   \node at (barycentric cs:A=1,B=1,C=1) {$<180^\circ$};

        \draw (a) -- (b);
        \end{tikzpicture}
        \caption{Triangle in a CAT(0) space}
        \label{fig:tri1}
    \end{minipage}\hfill
    \begin{minipage}{0.45\textwidth}
    \centering
    \begin{tikzpicture}[font=\sffamily]
    \path (0,0) coordinate (A) (60:3) coordinate (B) (3,0) coordinate (C);
    \draw [thick] 
          (A) node[left]{$A$} -- coordinate[label=left:$a$] (a)
          (B) node[above right]{$B$} -- coordinate[label=right:$b$] (b)
          (C) node[right]{$C$} -- coordinate (c)
          cycle;
     \draw (a) -- (b);
    \end{tikzpicture}
    \caption{Triangle in an Euclidean space}
    \label{fig:tri2}
    \end{minipage}
\end{figure}
\end{document}

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