我为有向图编写了以下代码,但箭头的尺寸太小。我的问题是如何放大箭头的尺寸
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations.markings}
\begin{document}
\begin{tikzpicture}
[x=1.3cm, y=1cm,
every edge/.style={
draw,
postaction={decorate,
decoration={markings,mark=at position 0.5 with {{\arrow{>}}}}
}
}
]
\draw (0,1) node [circle,fill, inner sep=2pt] {};
\draw (2,1) node [circle,fill, inner sep=2pt] {};
\draw (0,0) node [circle,fill, inner sep=2pt] {};
\draw (2,0) node [circle,fill, inner sep=2pt] {};
\draw (0,-1) node [circle,fill, inner sep=2pt] {};
\draw (2,-1) node [circle,fill, inner sep=2pt] {};
\path
(0,1)edge(2,1)
(2,0) edge (0,0)
(0,-1) edge (2,-1)
;
\end{tikzpicture}
\end{document}