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用不同方向的箭頭裝飾輪廓

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用不同方向的箭頭裝飾輪廓

在這貼文詳細解釋如何用箭頭裝飾輪廓。我怎麼才能做同樣的事情，但使一個輪廓有一個方向的箭頭，而另一個輪廓有相反的箭頭？輪廓處於相同的tikzpicture環境。也許可以定義裝飾的多個實例嗎？

答案1

您可以定義多個標記，並且可以透過沿相反方向繪製路徑或使用反向箭頭定義標記來反轉。

在此輸入影像描述

\documentclass[border=2mm]{standalone}

\usepackage{tikz}
\usetikzlibrary{decorations.markings}
\tikzset
  {marking1/.style=
     {decoration=
        {markings,
         mark=at position 0.5 with {\arrow[line width=1pt]{>}}
        },
      postaction=decorate
     },
   marking1reversed/.style=
     {decoration=
        {markings,
         mark=at position 0.5 with {\arrow[line width=1pt]{<}}
        },
      postaction=decorate
     },
   marking2/.style=
     {decoration=
        {markings,
         mark=at position 0.33 with {\arrow[line width=1pt]{stealth}},
         mark=at position 0.66 with {\arrow[line width=1pt,xscale=-1]{stealth}}
        },
      postaction=decorate
     }
  }
\begin{document}
\begin{tikzpicture}
  % a path with three sections
  \draw[marking1] (0,0) -- (2,0);
  \draw[marking1] (2,0) -- (1,1);
  \draw[marking1] (1,1) -- (0,0);
  % path drawn in the opposite direction, with the same marking
  \begin{scope}[xshift=3cm]
    \draw[marking1] (0,0) -- (1,1);
    \draw[marking1] (1,1) -- (2,0);
    \draw[marking1] (2,0) -- (0,0);
  \end{scope}
  % the original path, but with another marking that reverses the arrows
  \begin{scope}[xshift=6cm]
    \draw[marking1reversed] (0,0) -- (2,0);
    \draw[marking1reversed] (2,0) -- (1,1);
    \draw[marking1reversed] (1,1) -- (0,0);
  \end{scope}
  % the original path with a completely different marking
  \begin{scope}[xshift=9cm]
    \draw[marking2] (0,0) -- (2,0);
    \draw[marking2] (2,0) -- (1,1);
    \draw[marking2] (1,1) -- (0,0);
  \end{scope}
\end{tikzpicture}
\end{document}

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