I am trying to plot two circles one below the other. I also want two draw two arrows (I prefer solid curly arrows) between the circles.
So far I tried the below code, but it is not working. Can anyone help ?
\documentclass[12pt]{beamer}
\usepackage{tikz}
\usepackage{pifont}
\usetikzlibrary{shapes.geometric,arrows}
\tikzstyle{circ} = [circle, minimum size=1cm, text centered, draw = black, fill = red!30]
\tikzstyle{arrow} = [thick,->,>=stealth]
\begin{document}
\begin{frame}{Introduction}
\begin{block}{Model}
\begin{figure}
\centering
\begin{tikzpicture}[node distance=1cm]
\node (env) [circ] {Environment};
\node (agent) [circ, below of=env] {Agent};
\draw [arrow] (env) -- (agent);
\draw [arrow] (agent) -- (env);
\end{tikzpicture}
\end{figure}
\end{block}
\end{frame}
\end{document}
node distance
, for example to 4cm, isn't enough?