tikz 中的弯曲双箭头？

Question 1

这只是为了好玩。两者皆可Raaja 的回答和符号 1 的答案很棒。但是，Raaa 的答案中的路径并不完全平行，而 Symbol 1 的答案中的路径不能单独着色（至少不能以明显的方式着色）。所以这里有一个可以记录路径然后平行传输它们等等的东西。这个解决方案使用了装饰，所以对于非常弯曲的路径，它会导致dimension too large errors，这是上述答案所没有的限制。这个建议可以按如下方式使用。您首先需要记录路径，例如

\path[record path={name=AB}] (A) to[bend left] (B);

然后就会有两条路径，一条称为顶部，另一条称为底部，它们通过平行传输从上面的路径出现。它们可以重建如下：

 \draw[-latex,reconstruct top=AB];
 \draw[red,-latex,reconstruct bottom=AB];

以下是完整代码和更多示例，包括这些路径之间的模式。这些内容所需的唯一库是decorations.markings，patterns并且bending仅用于示例和光学。

\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{decorations.markings,patterns,bending}
\newcounter{parrow}

\tikzset{
  record path/.style={
    /utils/exec=\tikzset{parrow/.cd, #1},
    decorate,
    decoration={
      markings,
      mark=at position 0 with {
        % init counter "parrow".
        \setcounter{parrow}{1}
        %\typeout{\pgfdecoratedpathlength}
        % record coordinates (parrowt-<name>-1) and (parrowt-<name>-1).
        \path 
          (0,\pgfkeysvalueof{/tikz/parrow/dist}/2) coordinate
            (parrowt-\pgfkeysvalueof{/tikz/parrow/name}-\number\value{parrow})
          (0,-\pgfkeysvalueof{/tikz/parrow/dist}/2) coordinate
            (parrowb-\pgfkeysvalueof{/tikz/parrow/name}-\number\value{parrow});
        % store step length (without unit) in \mystep globally.
        \pgfmathsetmacro{\mystep}{(\pgfdecoratedpathlength-4pt)/int(1+(\pgfdecoratedpathlength-4pt)/2pt)}
        \xdef\mystep{\mystep}
      },
      mark=between positions 2pt and 1 step \mystep pt with {
        % for every step, record coordinates (parrowt-<name>-<parrow>) and (parrowb-<name>-<parrow>)
        \stepcounter{parrow}
        \path
          (0,\pgfkeysvalueof{/tikz/parrow/dist}/2) coordinate
            (parrowt-\pgfkeysvalueof{/tikz/parrow/name}-\number\value{parrow})
          (0,-\pgfkeysvalueof{/tikz/parrow/dist}/2) coordinate 
            (parrowb-\pgfkeysvalueof{/tikz/parrow/name}-\number\value{parrow});
      }
    }
  },
  reconstruct top/.style={
    % insert a path along recoreded coordinates (parrowt-<name>-<n>), where <n> = 1 to <parrow>
    insert path={
      plot[variable=\t, samples at={1,...,\number\value{parrow}}, smooth] (parrowt-#1-\t)
    }
  },
  reconstruct bottom/.style={
    % insert a path along recoreded coordinates (parrowt-<name>-<n>), where <n> = <parrow>-1 to 1
    insert path={%
      plot[variable=\t, samples at={\number\value{parrow}, \the\numexpr\value{parrow}-1,...,1}, smooth] (parrowb-#1-\t)
    }
  },
  parrow area/.style={
    % insert a closed path
    insert path={
      (parrowt-#1-1) [reconstruct top=#1] -- 
      (parrowb-#1-\number\value{parrow}) [reconstruct bottom=#1]  --
      (parrowt-#1-1)
    }
  },
  % init keys
  parrow/.cd,
  dist/.initial=3.14pt,
  step/.initial=2pt,
  name/.initial={}
}

\begin{document}

\begin{tikzpicture}[font=\sffamily, nodes={circle,draw}]
  \path (0,0) node (A) {A} 
        (3,1) node (B) {B} 
        (3.2,-1) node(C) {C} 
        (5,0) node (D) {D};

  % A to B
  \path[record path={name=AB}] (A) to[bend left] (B);
  \draw[-latex, reconstruct top=AB];
  \draw[red, -latex, reconstruct bottom=AB];

  % B to C
  \path[record path] (B) to[out=-90,in=160] (C);
  \path[pattern=north east lines, parrow area];
  \draw[-latex, reconstruct top];
  \draw[red, -latex, reconstruct bottom];

  % C to D
  \path[record path={name=CD, dist=5pt}] (C) to[bend left] (D);
  \fill[yellow, parrow area=CD];
  \draw[blue, -latex, reconstruct top=CD];
  \draw[orange, -latex, reconstruct bottom=CD];
\end{tikzpicture}
\end{document}

Answer

这只是为了好玩。两者皆可Raaja 的回答和符号 1 的答案很棒。但是，Raaa 的答案中的路径并不完全平行，而 Symbol 1 的答案中的路径不能单独着色（至少不能以明显的方式着色）。所以这里有一个可以记录路径然后平行传输它们等等的东西。这个解决方案使用了装饰，所以对于非常弯曲的路径，它会导致dimension too large errors，这是上述答案所没有的限制。这个建议可以按如下方式使用。您首先需要记录路径，例如

\path[record path={name=AB}] (A) to[bend left] (B);

然后就会有两条路径，一条称为顶部，另一条称为底部，它们通过平行传输从上面的路径出现。它们可以重建如下：

 \draw[-latex,reconstruct top=AB];
 \draw[red,-latex,reconstruct bottom=AB];

以下是完整代码和更多示例，包括这些路径之间的模式。这些内容所需的唯一库是decorations.markings，patterns并且bending仅用于示例和光学。

\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{decorations.markings,patterns,bending}
\newcounter{parrow}

\tikzset{
  record path/.style={
    /utils/exec=\tikzset{parrow/.cd, #1},
    decorate,
    decoration={
      markings,
      mark=at position 0 with {
        % init counter "parrow".
        \setcounter{parrow}{1}
        %\typeout{\pgfdecoratedpathlength}
        % record coordinates (parrowt-<name>-1) and (parrowt-<name>-1).
        \path 
          (0,\pgfkeysvalueof{/tikz/parrow/dist}/2) coordinate
            (parrowt-\pgfkeysvalueof{/tikz/parrow/name}-\number\value{parrow})
          (0,-\pgfkeysvalueof{/tikz/parrow/dist}/2) coordinate
            (parrowb-\pgfkeysvalueof{/tikz/parrow/name}-\number\value{parrow});
        % store step length (without unit) in \mystep globally.
        \pgfmathsetmacro{\mystep}{(\pgfdecoratedpathlength-4pt)/int(1+(\pgfdecoratedpathlength-4pt)/2pt)}
        \xdef\mystep{\mystep}
      },
      mark=between positions 2pt and 1 step \mystep pt with {
        % for every step, record coordinates (parrowt-<name>-<parrow>) and (parrowb-<name>-<parrow>)
        \stepcounter{parrow}
        \path
          (0,\pgfkeysvalueof{/tikz/parrow/dist}/2) coordinate
            (parrowt-\pgfkeysvalueof{/tikz/parrow/name}-\number\value{parrow})
          (0,-\pgfkeysvalueof{/tikz/parrow/dist}/2) coordinate 
            (parrowb-\pgfkeysvalueof{/tikz/parrow/name}-\number\value{parrow});
      }
    }
  },
  reconstruct top/.style={
    % insert a path along recoreded coordinates (parrowt-<name>-<n>), where <n> = 1 to <parrow>
    insert path={
      plot[variable=\t, samples at={1,...,\number\value{parrow}}, smooth] (parrowt-#1-\t)
    }
  },
  reconstruct bottom/.style={
    % insert a path along recoreded coordinates (parrowt-<name>-<n>), where <n> = <parrow>-1 to 1
    insert path={%
      plot[variable=\t, samples at={\number\value{parrow}, \the\numexpr\value{parrow}-1,...,1}, smooth] (parrowb-#1-\t)
    }
  },
  parrow area/.style={
    % insert a closed path
    insert path={
      (parrowt-#1-1) [reconstruct top=#1] -- 
      (parrowb-#1-\number\value{parrow}) [reconstruct bottom=#1]  --
      (parrowt-#1-1)
    }
  },
  % init keys
  parrow/.cd,
  dist/.initial=3.14pt,
  step/.initial=2pt,
  name/.initial={}
}

\begin{document}

\begin{tikzpicture}[font=\sffamily, nodes={circle,draw}]
  \path (0,0) node (A) {A} 
        (3,1) node (B) {B} 
        (3.2,-1) node(C) {C} 
        (5,0) node (D) {D};

  % A to B
  \path[record path={name=AB}] (A) to[bend left] (B);
  \draw[-latex, reconstruct top=AB];
  \draw[red, -latex, reconstruct bottom=AB];

  % B to C
  \path[record path] (B) to[out=-90,in=160] (C);
  \path[pattern=north east lines, parrow area];
  \draw[-latex, reconstruct top];
  \draw[red, -latex, reconstruct bottom];

  % C to D
  \path[record path={name=CD, dist=5pt}] (C) to[bend left] (D);
  \fill[yellow, parrow area=CD];
  \draw[blue, -latex, reconstruct top=CD];
  \draw[orange, -latex, reconstruct bottom=CD];
\end{tikzpicture}
\end{document}

Question 2

第一种可能的方法基于：当我的节点在一条直线上时，如何让 Tikz 从一个节点到另一个节点绘制弯曲的箭头？（参见解决方案erik）

%&xelatex
% !TeX TXS-program:compile = txs:///xelatex/[--shell-escape]
\documentclass[convert={density=300,outext=.tiff}]{standalone}

\usepackage{tikz}
\usetikzlibrary{arrows}

\begin{document}

\begin{tikzpicture}[->,>=stealth',auto,node distance=3cm,
  thick,main node/.style={circle,draw,font=\sffamily\Large\bfseries}]

  \node[main node] (1) {a};
  \node[main node] (2) [right of=1, yshift = 2cm] {b};

\draw [->] (1) to [out=90,in=150] (2);
\draw [->,red] (2) to [out=160,in=80] (1);
\end{tikzpicture}
\end{document}

要得到

Answer

第一种可能的方法基于：当我的节点在一条直线上时，如何让 Tikz 从一个节点到另一个节点绘制弯曲的箭头？（参见解决方案erik）

%&xelatex
% !TeX TXS-program:compile = txs:///xelatex/[--shell-escape]
\documentclass[convert={density=300,outext=.tiff}]{standalone}

\usepackage{tikz}
\usetikzlibrary{arrows}

\begin{document}

\begin{tikzpicture}[->,>=stealth',auto,node distance=3cm,
  thick,main node/.style={circle,draw,font=\sffamily\Large\bfseries}]

  \node[main node] (1) {a};
  \node[main node] (2) [right of=1, yshift = 2cm] {b};

\draw [->] (1) to [out=90,in=150] (2);
\draw [->,red] (2) to [out=160,in=80] (1);
\end{tikzpicture}
\end{document}

要得到

tikz 中的弯曲双箭头？

答案1

答案2

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