Asymptote 在 Latex 中不起作用

Question

我是 Asymptote 的新手。我尝试了 AoPS 的代码。但它没有给出所需的输出。我没有在输出中得到任何数字。代码是

\documentclass{article}
\usepackage[pdftex]{graphicx}
\usepackage{asymptote}
\begin{document}
Hello.  
I like to make pics with Asymptote like this one:
\begin{figure}[h]
  \begin{asy}
    import graph;
    size(1inch);
    filldraw(circle((0,0),1),yellow,black);
    fill(circle((-.3,.4),.1),black);
    fill(circle((.3,.4),.1),black);
    draw(arc((0,0),.5,-140,-40));
  \end{asy}
\end{figure}
\par It makes me happy, 
since I can still type my normal LaTeX stuff around it: 
\(\int_0^{\pi}{\sin{x}}\,dx=2\)
\end{document}

我得到的输出是