Loop around node in state diagram

Question

I have a feeling this should be simple, but I can't find how to do it. I'm trying to draw an arrow looping around the corner of a node in a state diagram. I have the following, but as you see it cuts the corner, plus ideally the arrow would loop from nearer the corner.

\documentclass{standalone}
\usepackage{tikz}
\begin{document}
\pagestyle{empty}

\begin{tikzpicture}[%node distance = 15mm and 300mm,
    node/.style={
        draw,
        rectangle,
        text width=25mm,
        text centered,
        minimum height=20mm
    },  
    arrow/.style={
        very thick,
        ->
    }]

\node[node] (state) {State};

\draw [arrow] (state.south)  to [out=270, in=0]  (state.east);

\end{tikzpicture}
\end{document}

Answer 1

You have several possibilities: you can use the .. controls .. syntax, or the out=<value>,in=<value>,loop options perhaps combined with an appropriate looseness, or (as Jake suggested) you can use and arc to get a proper circle arc:

\documentclass{standalone}
\usepackage{tikz}

\begin{document}
\pagestyle{empty}

\begin{tikzpicture}[%node distance = 15mm and 300mm,
    node/.style={
        draw,
        rectangle,
        text width=25mm,
        text centered,
        minimum height=20mm
    },  
    arrow/.style={
        very thick,
        ->
    }]

\node[node] (state) {State};

\draw[red] [arrow] (state.270) .. controls  (0.5,-3) and (3.5,-1) ..  (state.0);
\draw[blue] (state) edge [out=270,in=0,loop] (state);
\draw[green] (state) edge [out=270,in=0,loop,looseness=4] (state);
\draw [arrow] (state.south east) ++(-0.75cm,0pt) arc [start angle=-180, end angle=90, radius=0.75cm];

\end{tikzpicture}

\end{document}