椭圆上的圆节点

Question

我想把这个节点放在椭圆上大约 35% 的位置

\node[draw, circle, inner sep = .08cm, scale = .75] (location) {2};

\documentclass{article}
\begin{document}
\usepackage{tikz}
\usetikzlibrary{arrows, decorations.markings, decorations.pathreplacing}
\begin{tikzpicture}
\begin{scope}[decoration = {markings, mark = at position 0.3 with {\arrow{>}},} ]
  \clip (-5,0) rectangle (1,2.5);
  \draw[postaction = decorate] (-2,0) ellipse (3cm and 2cm);
\end{scope}
\end{tikzpicture}
\end{document}

我怎样才能实现这个目标？

Answer 1

您可以使用markings用于放置箭头的库来放置节点：

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{arrows, decorations.markings, decorations.pathreplacing}

\begin{document}
\begin{tikzpicture}
\begin{scope}[
    decoration = {
        markings,
        mark = at position 0.3 with {\arrow{>}},
        mark = at position 0.3 with {\node[draw, circle, inner sep = .08cm, scale = .75] (location) {2};}
    } ]
  \clip (-5,0) rectangle (1,2.5);
  \draw[postaction = decorate] (-2,0) ellipse (3cm and 2cm);
\end{scope}
\end{tikzpicture}
\end{document}