答案1
\documentclass[tikz, border=1cm]{standalone}
\usetikzlibrary{arrows.meta}
\begin{document}
\begin{tikzpicture}
\fill[green!30] (0,0) rectangle (3,-2);
\fill[green!70!black] (2,-1) circle [radius=0.05];
\draw[green!70!black, densely dotted, shorten >=2.5, line cap=round, -{Triangle[round, width'=0pt .4, length=3pt]}] (0,0) -- (2,-1);
\end{tikzpicture}
\end{document}