带有 tikz 形状的黑色边框

Question

我有一个 tikz 三角形，我想给它添加边框。不知为何，我看到两边都有黑色边框，但第三边却看不到。你能帮我找出原因吗？

以下是 MWE：

\documentclass{article}

\usepackage{etoolbox}
\usepackage{tikz}
\definecolor{mycolor}{RGB}{255,255,0}       % use mycolor to give a specific color to tikz

%\newrobustcmd*{\mytriangle}[1]{\tikz{\filldraw[draw=red,fill=#1] (0,0) --
%(0.2cm,0) -- (0.1cm,0.2cm);}}

\newrobustcmd*{\mytriangle}[1]{\tikz{\draw[thick, fill=mycolor] (0,0) -- (0.2cm,0) -- (0.1cm,0.2cm);}}

\begin{document}
\listoffigures

\section{Sample}
This is a triangle \mytriangle{mycolor}.

\begin{figure}[htp]
  \centering
  A figure
  \caption{A triangle \mytriangle{mycolor}.}
\end{figure}

\end{document}

Answer 1

关闭路径：

(0,0) -- (0.2cm,0) -- (0.1cm,0.2cm) -- cycle;