我如何从节点绘制到同一个节点本身的边？

Question

我使用 tikz 绘制三角形中的三个节点，并用箭头连接。我想从每个节点添加一个圆边以本身，基本上像 \path[<->] (left) edge (left)下面的示例一样添加边。但是，它似乎不起作用。有人能给我提示如何解决这个问题/在哪里查看吗？

\begin{tikzpicture}
\draw(0,0)node[left] (left){news media };
\draw(5,0)node[right] (right) {citizens};
\draw(60:5)node[above] (above){political actors};
\path[<->] (left) edge (right);
\path[<->] (left) edge (above);
\path[<->] (above) edge (right);
\end{tikzpicture}

Answer 1

loop正如问题下方评论中所述，可以使用pgfmanual (v3.0.1a) 中的第 70.4 节，第 748 页。应用到你给出的例子，它将类似于

\documentclass[border=2mm]{standalone}
    \usepackage{tikz}
\begin{document}
    \begin{tikzpicture}
        \draw(0,0)node[left] (left){news media };
        \draw(5,0)node[right] (right) {citizens};
        \draw(60:5)node[above] (above){political actors};
        \path[<->] (left)
            edge (right)
            edge [loop left] node {bla} ()
        ;
        \path[<->] (right)
            edge (above)
            edge [loop right] node {bli} ()
        ;
        \path[<->] (above)
            edge (left)
            edge [loop above] node {blub} ()
        ;
    \end{tikzpicture}
\end{document}

结果如下