# Figure with a different box around

I'm trying to make a box around my figure like the ones in Benjamin Pierce "Types and Programming Languages" book and Luca Cardelli paper "Types Systems". Such boxes have horizontal rules and only small vertical lines on the corners.

I can't really get the hack, does anyone have any idea on how to do this?

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It is easy with tikz, but I would say that it is overkill. Better wait to pure-latex solutions. Unless you already are using tikz in your document, of course. –  JLDiaz Mar 19 '13 at 19:39
have a look at mdframed –  cmhughes Mar 19 '13 at 21:05

\documentclass{article}

\newenvironment{foo}[2][c]
{\begin{minipage}[#1]{#2}\centering
\hrule height2pt
\centerline{\vrule width2pt height 5pt\hfill \vrule width2pt height 5pt}
\begin{minipage}{\dimexpr\textwidth-4pt-1em}}
{\end{minipage}
\centerline{\vrule width2pt height 5pt\hfill \vrule width2pt height 5pt}
\hrule height2pt
\end{minipage}}

\begin{document}

\begin{foo}[b]{.3\textwidth}

A \dotfill\ B \dotfill\ C\\
A \dotfill\ B \dotfill\ C\\
A \dotfill\ B \dotfill\ C
\end{foo}
\hfill
\begin{foo}[t]{.3\textwidth}

A \dotfill\ B \dotfill\ C\\
A \dotfill\ B \dotfill\ C\\
A \dotfill\ B \dotfill\ C
\end{foo}

\end{document}

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Here's another possibility using the float and caption packages to add the rules to the standard figure environment:

\documentclass{article}
\usepackage[demo]{graphicx}
\usepackage{float}
\usepackage{caption}

\DeclareCaptionFormat{myrule}{%
\rule{1pt}{8pt}%
\kern-1pt\raisebox{-1pt}{\rule{\linewidth}{1pt}}%
\kern-1pt\rule{1pt}{8pt}\par\smallskip#1#2#3}

\makeatletter
\renewcommand\fs@ruled{\def\@fs@cfont{\bfseries}\let\@fs@capt\floatc@ruled%
\def\@fs@pre{\rule{1pt}{8pt}\kern-1pt\raisebox{8pt}{\rule{\linewidth}{1pt}}\kern-1pt\rule{1pt}{8pt}}%
\def\@fs@post{}%
\def\@fs@mid{}%
\let\@fs@iftopcapt\iffalse%
}
\makeatother

\floatstyle{ruled}
\restylefloat{figure}
\captionsetup[figure]{format=myrule,labelsep=colon}

\begin{document}

\begin{figure}
\centering
\includegraphics{image}
\caption{A test ruled figure}
\end{figure}

\end{document}


The float package was used to build the upper set of rules, and the caption package was used to define the lower ones.

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