均匀分割路径（减去箭头）

Question

我想将路径均匀地（分成三部分）分割，这样当箭头尖遮住部分路径时就可以使用。换句话说，我希望以下文档中每种颜色的片段长度相等：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{decorations.pathreplacing}
\begin{document}
    
\newcommand{\withthirdscoordinates}[1]{
    \begin{scope}
        \coordinate (n0) at (\tikzinputsegmentfirst);
        \coordinate (n3) at (\tikzinputsegmentlast);
        \coordinate (n1) at (barycentric cs:n0=2,n3=1);
        \coordinate (n2) at (barycentric cs:n0=1,n3=2);
        #1
    \end{scope}
}

\tikzset{
  mystyle/.style={
    decoration={
      show path construction,
      lineto code={
        \withthirdscoordinates{
          \draw [-, color=red] (n0) -- (n1);
          \draw [-, color=green] (n1) -- (n2);
          \draw [color=blue] (n2) -- (n3);
        }
      },
    },
    decorate
  }
}

\tikzset{
  every node/.style={circle, draw}
}

\begin{tikzpicture}
\node (A) at (0,0) {A};
\node (B) at (5,0) {B};
\draw[-{Triangle[open]}, mystyle] (A) -- (B);
\end{tikzpicture}

\begin{tikzpicture}
\node (A) at (0,0) {A};
\node (B) at (5,0) {B};
\draw[-{Triangle[open, length=35pt]}, mystyle] (A) -- (B);
\end{tikzpicture}

\end{document}   

Answer 1

这个答案非常片面，因为它只适用于水平直线，而不适用于倾斜的直线。

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{decorations.pathreplacing}
    
\tikzset{
  mystyle/.style={
    -{Triangle[open, length=#1]},
    decoration={
      show path construction,
      lineto code={
        \coordinate (n0) at (\tikzinputsegmentfirst);
        \coordinate (n3) at ([xshift=-#1]\tikzinputsegmentlast);
        \coordinate (n4) at (\tikzinputsegmentlast);
        \coordinate (n1) at (barycentric cs:n0=2,n3=1);
        \coordinate (n2) at (barycentric cs:n0=1,n3=2);
        \draw [-, color=red] (n0) -- (n1);
        \draw [-, color=green] (n1) -- (n2);
        \draw [-, color=blue] (n2) -- (n3);
        \draw (n3) -- (n4);
        }
      },
    decorate
  },
  mystyle/.default=5pt,
  every node/.style={circle, draw}
}

\begin{document}
\begin{tikzpicture}
\node (A) at (0,0) {A};
\node (B) at (5,0) {B};
\draw[mystyle] (A) -- (B);
\end{tikzpicture}

\begin{tikzpicture}
\node (A) at (0,0) {A};
\node (B) at (5,0) {B};
\draw[mystyle={35pt}] (A) -- (B);
\end{tikzpicture}
\end{document}

也可以看看这里。