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如何在两条路径之间绘制向内的箭头？

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如何在两条路径之间绘制向内的箭头？

如何在两条路径之间绘制向内的箭头，如下图所示？

答案1

这是一个使用选项hobby对于“波浪形”曲线，intersections库用于确定曲线上的适当点，decorations.markings库用于将箭头放置在曲线之间线段的中间；这些线段对应于从圆心延伸出的线的部分：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{hobby,intersections,decorations.markings}

\begin{document}

\begin{tikzpicture}[
decoration={
  markings,
  mark= at position 0.5 with {\arrow{latex}}
  },
  line width=1pt
]
\draw[name path=circle] 
  (0,0) circle [radius=3cm];
\begin{pgfinterruptboundingbox}
\draw[name path=curve,orange!70!black]
  (4,1) to[closed, curve through={
    (3,4) .. (2,4) .. (0,5) .. (-4,0) .. (1,-5) .. (0,-3) .. (2,-5) .. (4,-3) .. (2,0)}]  cycle;
\end{pgfinterruptboundingbox}
\foreach \Angulo in {0,10,...,360}
{
  \path[overlay,name path=line-\Angulo] (0,0) -- (\Angulo:10cm);
  \path[overlay,name intersections={of=circle and line-\Angulo,name=i}] 
    (0,0) -- (\Angulo:10cm);
  \path[overlay,name intersections={of=curve and line-\Angulo,name=j}] 
    (0,0) -- (\Angulo:10cm);
  \draw[blue!70!black,postaction=decorate] (j-1) -- (i-1);
}
\end{tikzpicture}

\end{document}

在此处输入图片描述

答案2

这应该能给你一些想法。

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.markings}
\begin{document}

\begin{tikzpicture}
    \foreach \x in {1,...,10}{
     \draw (4,0) arc(0:360:4cm) node[coordinate,pos=0.\x] (a-\x) {};
     \draw[thick, red]
      (3,2) arc(0:360:4cm) node[coordinate,pos=0.\x] (b-\x) {};
     \draw[decoration={markings, mark=at position 0.5 with
        {\arrow{latex}}},
     postaction={decorate}] (b-\x) -- (a-\x);
     }

\end{tikzpicture}

\end{document}

在此处输入图片描述

这是一条更加弯曲的线hobby。

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{hobby,decorations.markings}
\begin{document}

\begin{tikzpicture}
    \foreach \x in {1,...,10}{
     \draw (4,0) arc(0:360:4cm) node[coordinate,pos=0.\x] (a-\x) {};
     \draw[thick, red,decoration={markings, mark=at position 0.\x with
        {\node[fill,circle,inner sep=2pt,pos=0.\x] (b-\x) {};}},
     postaction={decorate}]
      (4,1) to[closed, curve through={(3,4) .. (1,3) ..
        (-2,5)..(-5,0)..(-3,-5)..(0,-3)..(2,-5)..(3,-3)}]  cycle;
     \draw[decoration={markings, mark=at position 0.5 with
         {\arrow{latex}}},
         postaction={decorate}] (a-\x) -- (b-\x);
     }

\end{tikzpicture}

\end{document}

在此处输入图片描述

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