我一直在尝试绘制一个看起来有点像下面 MWE 所示的图表；正如标题所示，我想放置标记箭头（只有两个标签：a或b）来指示每个边中间的方向。
我希望有一种更简洁的方法来做到这一点，而不是计算每个顶点的位置并绘制一条带有特定方向箭头的边；唉，因为我不熟悉这个包，所以即使是如此基本的东西我也记不清了。
我一直在搜索这个网站（以及谷歌认为相关的任何网站），所以我知道我可以使用 Loop Space 的答案来完成上述操作TikZ：如何在线中间画箭头？我在使用这种方法时遇到的问题是箭头的大小似乎使图表变得比我想要的更加混乱（我实际上还没有测试全套，只是测试了底部边缘）。
总结一下：是否可以设置一个命令，以均匀的方式分配一定数量的箭头（例如，在底部边缘，我想要正好 6 个），并且每个箭头都使用规定的方向（看完我的徒手绘图后，可能更容易让箭头交替排列）？
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\begin{scope}[thick]
\draw (0,0)-- (3,5.196);
\draw (2,0)-- (5,5.196);
\draw (4,0)-- (7,5.196);
\draw (6,0)-- (9,5.196);
\draw (0,0)-- (6,0);
\draw (1,1.732)-- (7,1.732);
\draw (2,3.464)-- (8,3.464);
\draw (3,5.196)-- (9,5.196);
\draw (0.5,0.866)-- (1,0);
\draw (1.5,2.598)-- (3,0);
\draw (2.5,4.33)-- (5,0);
\draw (4,5.196)-- (6.5,0.866);
\draw (6,5.196)-- (7.5,2.598);
\draw (8,5.196)-- (8.5,4.33);
\end{scope}
\end{tikzpicture}
\end{document}
答案1
类似这样的事？分发是手动的，在这种情况下并不统一。
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.markings,arrows.meta}
\tikzset{
arrowmark/.style 2 args={decoration={markings,mark=at position #1 with \arrow{#2}}}
}
\begin{document}
\begin{tikzpicture}
\begin{scope}[thick]
\draw (0,0)-- node {} (3,5.196);
\draw (2,0)-- node {} (5,5.196);
\draw (4,0)-- node {} (7,5.196);
\draw (6,0)-- node {} (9,5.196);
\draw (0,0)-- (6,0);
\foreach \x/\a in {0.1/a,0.26/b,0.43/c,0.6/d,0.76/e,0.92/f}{
\path (0,0) -- node[xshift=-1mm,below=1mm,pos=\x,inner sep=0pt]{\strut \a} (6,0);
\path[postaction={decorate}, arrowmark={\x}{Stealth[scale=0.8]}] (0,0)-- (6,0);
}
\draw (1,1.732)-- node {} (7,1.732);
\draw (2,3.464)-- node {} (8,3.464);
\draw (3,5.196)-- node {} (9,5.196);
\draw (0.5,0.866)-- node {} (1,0);
\draw (1.5,2.598)-- node {} (3,0);
\draw (2.5,4.33)-- node {} (5,0);
\draw (4,5.196)-- node {} (6.5,0.866);
\draw (6,5.196)-- node {} (7.5,2.598);
\draw (8,5.196)-- node {} (8.5,4.33);
\end{scope}
\end{tikzpicture}
\end{document}
答案2
我想发布对我的问题的回答，包括我使用的所有代码，以便有一个（有点）全面的覆盖空间图的示例（具体来说，这是来自 Hatcher 1.3.13）；如果有更好或更有效的编写代码的方法，请随时编辑。
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows}
\usetikzlibrary{decorations.markings,arrows.meta}\tikzset{
arrowmark/.style 2 args={decoration={markings,mark=at position #1 with \arrow{#2}}}
}
\begin{document}
\hspace{-0.75in}{\tiny
\begin{tikzpicture}[x=1.75cm,y=1.75cm]
\begin{scope}[thick]
\draw (0,0)-- (3,5.196);
\foreach \x/\a in {0.1/a,0.26/b,0.43/a,0.6/b,0.76/a,0.92/b}{
\path (0,0) -- node[xshift=-2.5mm,below=-0.8mm,pos=\x,inner sep=0pt]{\strut \a} (3,5.196);
\path[postaction={decorate}, arrowmark={\x}{}] (0,0)-- (3,5.196);
}
\draw[postaction={decorate},
arrowmark={0.1}{Stealth[scale=0.8,reversed]},
arrowmark={0.26}{Stealth[scale=0.8]},
arrowmark={0.43}{Stealth[scale=0.8,reversed]},
arrowmark={0.60}{Stealth[scale=0.8]},
arrowmark={0.76}{Stealth[scale=0.8,reversed]},
arrowmark={0.92}{Stealth[scale=0.8]},] (0,0)-- (3,5.196);
\draw (2,0)-- (5,5.196);
\foreach \x/\a in {0.1/a,0.26/b,0.43/a,0.6/b,0.76/a,0.92/b}{
\path (2,0) -- node[xshift=-2.5mm,below=-0.8mm,pos=\x,inner sep=0pt]{\strut \a} (5,5.196);
\path[postaction={decorate}, arrowmark={\x}{}] (2,0)-- (5,5.196);
}
\draw[postaction={decorate},
arrowmark={0.1}{Stealth[scale=0.8,reversed]},
arrowmark={0.26}{Stealth[scale=0.8]},
arrowmark={0.43}{Stealth[scale=0.8,reversed]},
arrowmark={0.60}{Stealth[scale=0.8]},
arrowmark={0.76}{Stealth[scale=0.8,reversed]},
arrowmark={0.92}{Stealth[scale=0.8]},] (2,0)-- (5,5.196);
\draw (4,0)-- (7,5.196);
\foreach \x/\a in {0.1/a,0.26/b,0.43/a,0.6/b,0.76/a,0.92/b}{
\path (4,0) -- node[xshift=-2.5mm,below=-0.8mm,pos=\x,inner sep=0pt]{\strut \a} (7,5.196);
\path[postaction={decorate}, arrowmark={\x}{}] (4,0)-- (7,5.196);
}
\draw[postaction={decorate},
arrowmark={0.1}{Stealth[scale=0.8,reversed]},
arrowmark={0.26}{Stealth[scale=0.8]},
arrowmark={0.43}{Stealth[scale=0.8,reversed]},
arrowmark={0.60}{Stealth[scale=0.8]},
arrowmark={0.76}{Stealth[scale=0.8,reversed]},
arrowmark={0.92}{Stealth[scale=0.8]},] (4,0)-- (7,5.196);
\draw (6,0)-- (9,5.196);
\foreach \x/\a in {0.1/a,0.26/b,0.43/a,0.6/b,0.76/a,0.92/b}{
\path (6,0) -- node[xshift=-2.5mm,below=-0.8mm,pos=\x,inner sep=0pt]{\strut \a} (9,5.196);
\path[postaction={decorate}, arrowmark={\x}{}] (6,0)-- (9,5.196);
}
\draw[postaction={decorate},
arrowmark={0.1}{Stealth[scale=0.8,reversed]},
arrowmark={0.26}{Stealth[scale=0.8]},
arrowmark={0.43}{Stealth[scale=0.8,reversed]},
arrowmark={0.60}{Stealth[scale=0.8]},
arrowmark={0.76}{Stealth[scale=0.8,reversed]},
arrowmark={0.92}{Stealth[scale=0.8]},] (6,0)-- (9,5.196);
\draw (0,0)-- (6,0);
\foreach \x/\a in {0.1/a,0.26/b,0.43/a,0.6/b,0.76/a,0.92/b}{
\path (0,0) -- node[xshift=-1mm,below=0.8mm,pos=\x,inner sep=0pt]{\strut \a} (6,0);
\path[postaction={decorate}, arrowmark={\x}{}] (0,0)-- (6,0);
}
\draw[postaction={decorate}, arrowmark={0.1}{Stealth[scale=0.8]},
arrowmark={0.26}{Stealth[scale=0.8,reversed]},
arrowmark={0.43}{Stealth[scale=0.8]},
arrowmark={0.60}{Stealth[scale=0.8,reversed]},
arrowmark={0.76}{Stealth[scale=0.8]},
arrowmark={0.92}{Stealth[scale=0.8,reversed]},] (0,0)-- (6,0);
\draw (1,1.732)--(7,1.732);
\foreach \x/\a in {0.1/a,0.26/b,0.43/a,0.6/b,0.76/a,0.92/b}{
\path (1,1.732) -- node[xshift=-1mm,below=0.5mm,pos=\x,inner sep=0pt]{\strut \a} (7,1.732);
\path[postaction={decorate}, arrowmark={\x}{}] (1,1.732)-- (7,1.732);
}
\draw[postaction={decorate},
arrowmark={0.1}{Stealth[scale=0.8]},
arrowmark={0.26}{Stealth[scale=0.8,reversed]},
arrowmark={0.43}{Stealth[scale=0.8]},
arrowmark={0.60}{Stealth[scale=0.8,reversed]},
arrowmark={0.76}{Stealth[scale=0.8]},
arrowmark={0.92}{Stealth[scale=0.8,reversed]},] (1,1.732)-- (7,1.732);
\draw (2,3.464)--(8,3.464);
\foreach \x/\a in {0.1/a,0.26/b,0.43/a,0.6/b,0.76/a,0.92/b}{
\path (2,3.464) -- node[xshift=-1mm,below=0.5mm,pos=\x,inner sep=0pt]{\strut \a} (8,3.464);
\path[postaction={decorate}, arrowmark={\x}{}] (2,3.464)-- (8,3.464);
}
\draw[postaction={decorate},
arrowmark={0.1}{Stealth[scale=0.8]},
arrowmark={0.26}{Stealth[scale=0.8,reversed]},
arrowmark={0.43}{Stealth[scale=0.8]},
arrowmark={0.60}{Stealth[scale=0.8,reversed]},
arrowmark={0.76}{Stealth[scale=0.8]},
arrowmark={0.92}{Stealth[scale=0.8,reversed]},] (2,3.464)-- (8,3.464);
\draw (3,5.196)--(9,5.196);
\foreach \x/\a in {0.1/a,0.26/b,0.43/a,0.6/b,0.76/a,0.92/b}{
\path (3,5.196) -- node[xshift=-1mm,below=0.5mm,pos=\x,inner sep=0pt]{\strut \a} (9,5.196);
\path[postaction={decorate}, arrowmark={\x}{}] (3,5.196)-- (9,5.196);
}
\draw[postaction={decorate},
arrowmark={0.1}{Stealth[scale=0.8]},
arrowmark={0.26}{Stealth[scale=0.8,reversed]},
arrowmark={0.43}{Stealth[scale=0.8]},
arrowmark={0.60}{Stealth[scale=0.8,reversed]},
arrowmark={0.76}{Stealth[scale=0.8]},
arrowmark={0.92}{Stealth[scale=0.8,reversed]},] (3,5.196)-- (9,5.196);
\draw (0.5,0.866)-- (1,0);
\foreach \x/\a in {0.5/a}{
\path (0.5,0.866) -- node[xshift=-1.5mm,below=-0.25mm,pos=\x,inner sep=0pt]{\strut \a} (1,0);
\path[postaction={decorate}, arrowmark={\x}{}] (0.5,0.866)-- (1,0);
}
\draw[postaction={decorate},
arrowmark={0.5}{Stealth[scale=0.8,reversed]},] (0.5,0.866)-- (1,0);
\draw (1.5,2.598)--(3,0);
\foreach \x/\a in {0.166/a,0.5/b,0.833/a}{
\path (1.5,2.598) -- node[xshift=-1.5mm,below=-0.8mm,pos=\x,inner sep=0pt]{\strut \a} (3,0);
\path[postaction={decorate}, arrowmark={\x}{}] (1.5,2.598)-- (3,0);
}
\draw[postaction={decorate},
arrowmark={0.166}{Stealth[scale=0.8,reversed]},
arrowmark={0.5}{Stealth[scale=0.8]},
arrowmark={0.833}{Stealth[scale=0.8,reversed]},] (1.5,2.598)-- (3,0);
\draw (2.5,4.33)--(5,0);
\foreach \x/\a in {0.1/a,0.3/b,0.5/a,0.7/b,0.9/a}{
\path (2.5,4.33) -- node[xshift=-1.5mm,below=-0.8mm,pos=\x,inner sep=0pt]{\strut \a} (5,0);
\path[postaction={decorate}, arrowmark={\x}{}] (2.5,4.33)-- (5,0);
}
\draw[postaction={decorate},
arrowmark={0.1}{Stealth[scale=0.8,reversed]},
arrowmark={0.3}{Stealth[scale=0.8]},
arrowmark={0.5}{Stealth[scale=0.8,reversed]},
arrowmark={0.7}{Stealth[scale=0.8]},
arrowmark={0.9}{Stealth[scale=0.8,reversed]}] (2.5,4.33)-- (5,0);
\draw (4,5.196)-- (6.5,0.866);
\foreach \x/\a in {0.1/b,0.3/a,0.5/b,0.7/a,0.9/b}{
\path (4,5.196) -- node[xshift=-1.5mm,below=-0.8mm,pos=\x,inner sep=0pt]{\strut \a} (6.5,0.866);
\path[postaction={decorate}, arrowmark={\x}{}] (4,5.196)-- (6.5,0.866);
}
\draw[postaction={decorate},
arrowmark={0.1}{Stealth[scale=0.8]},
arrowmark={0.3}{Stealth[scale=0.8,reversed]},
arrowmark={0.5}{Stealth[scale=0.8]},
arrowmark={0.7}{Stealth[scale=0.8,reversed]},
arrowmark={0.9}{Stealth[scale=0.8]}] (4,5.196)-- (6.5,0.866);
\draw (6,5.196)--(7.5,2.598);
\foreach \x/\a in {0.166/b,0.5/a,0.833/b}{
\path (6,5.196) -- node[xshift=-1.5mm,below=-0.8mm,pos=\x,inner sep=0pt]{\strut \a} (7.5,2.598);
\path[postaction={decorate}, arrowmark={\x}{}] (1.5,2.598)-- (3,0);
}
\draw[postaction={decorate},
arrowmark={0.166}{Stealth[scale=0.8]},
arrowmark={0.5}{Stealth[scale=0.8,reversed]},
arrowmark={0.833}{Stealth[scale=0.8]},] (6,5.196)-- (7.5,2.598);
\draw (8,5.196)--(8.5,4.33);
\foreach \x/\a in {0.5/b}{
\path (8,5.196) -- node[xshift=-1.5mm,below=-0.25mm,pos=\x,inner sep=0pt]{\strut \a} (8.5,4.33);
\path[postaction={decorate}, arrowmark={\x}{}] (8.5,5.196)-- (8.5,4.33);
}
\draw[postaction={decorate},
arrowmark={0.5}{Stealth[scale=0.8,reversed]},] (8,5.196)-- (8.5,4.33);
\end{scope}
\end{tikzpicture}
}
\end{document}
此代码生成下图：
