用自定义边填充正方形

Question

我有以下代码，它生成一个正方形的边界，每个边都标有某种箭头。我想用颜色填充内部，但是当我添加“fill=color”作为参数时，生成的图像没有任何变化。我该如何让它工作？

\[
\begin{tikzcd}[
sep=2cm,
cells={shape=coordinate}
]
  \ar[draw=none,r, "{\tikz\node[rotate=270,inner sep=0pt] {\tikz\draw[->](0,0);};  }" description]
  \ar[dash,r] 
& 
{} 
\\
  \ar[draw=none,r, "{\tikz\node[rotate=270,inner sep=0pt] {\tikz\draw[->](0,0)     ;};  }" description] 
  \ar[draw=none,u, "{\tikz\node[inner sep=0pt] {\tikz\draw[->>](0,0) ;}; }" description] 
  \ar[dash,r] 
  \ar[dash,u] 
& 
{}
  \ar[draw=none,u, "{\tikz\node[inner sep=0pt] {\tikz\draw[->>](0,0) ;}; }" description]
    \ar[dash,u]  
\end{tikzcd}.
\] 

Answer 1

这与填充一起工作并且不嵌套tikzpicture。

\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{decorations.markings}
\begin{document}
\begin{tikzpicture}[insert arrow/.style args={#1/#2}{postaction={decorate,
decoration={markings,mark=at position #1 with {\arrow{#2}}}}}]
 \draw[fill=blue!30,insert arrow/.list={0.125/>,0.37/>,0.38/>,0.625/<,0.87/<,0.88/<}] (0,0) -| ++ (2,2) -| cycle;
\end{tikzpicture}
\end{document}