在完整图表上添加标签

Question

大家好，我有这张图片，我想通过在边缘上添加名称来使它变得更好。例如，我想让连接 1 和 4 的边缘成为$\theta_1 \theta_4$所有边缘的代名词。非常感谢，我非常感谢阅读此文的任何人提供的帮助和时间！

\begin{tikzpicture}[transform shape]
  \foreach \x in {1,...,4}{%
    \pgfmathparse{(\x-1)*360/4}
    \node[draw,circle,inner sep=0.15cm] (N-\x) at (\pgfmathresult:1.4cm) {\x};
  } 
  \foreach \x [count=\xi from 1] in {1,...,4}{%
    \foreach \y in {\x,...,4}{%
     \path (N-\x) edge[ultra thin,-] (N-\y);

  }
}
\end{tikzpicture}

Answer 1

node您可以通过沿边缘放置 s 来实现这一点。这是一个次优但自动化的解决方案。当然，您可以手动放置edges 和nodes ，然后选择nodes 应该出现在红色 的位置node。

\documentclass[border=2mm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
    \foreach \x in {1,...,4}{%
        \pgfmathparse{(\x-1)*360/4}
        \node [draw,circle,inner sep=0.15cm] (N-\x) at (\pgfmathresult:1.4cm) {\x};
    }
    \foreach \x in {1,...,4}{%
        % because there is no need to draw an edge to the starting node itself
        % start at index 2 in the second loop
        \foreach \y in {2,...,4}{%
            % also the edge should only be drawn, if \x is smaller than \y
            \ifnum \x<\y
                \path (N-\x) edge [ultra thin,-]
                    node [auto,swap] {$\theta_{\x} \theta_{\y}$}
                        (N-\y);
            \fi
        }
    }
    % edge placed by hand
    \path (N-1) edge [ultra thin,-]
        node [auto,red] {$\theta_{1} \theta_{4}$}
            (N-4);
\end{tikzpicture}
\end{document}