algorithm2e - make the topmost and bottom horizontal lines thicker

Question

I'm pretty satisfied with the output above, yet would prefer having the topmost and the bottom horizontal lines bolder. Any help?

Answer 1

The following length names seem to control the rule heights:

\setlength\algoheightrule{<height>}        % The upper and the lower rules
\setlength\algotitleheightrule{<height>} % The rule between a title and code

If you want to restore the default lengths, run the following

\setlength\algoheightrule{\algoheightruledefault} 
\setlength\algotitleheightrule{\algotitleheightruledefault}

The example:

\documentclass{article}
\usepackage[ruled]{algorithm2e}

\setlength\algoheightrule{2pt}        % Upper and lower rules
\setlength\algotitleheightrule{1.2pt} % Rule below the title

\begin{document}
\IncMargin{1em}
\begin{algorithm}
    \SetKwData{Left}{left}\SetKwData{This}{this}\SetKwData{Up}{up}
    \SetKwFunction{Union}{Union}\SetKwFunction{FindCompress}{FindCompress}
    \SetKwInOut{Input}{input}\SetKwInOut{Output}{output}
    \Input{A bitmap $Im$ of size $w\times l$}
    \Output{A partition of the bitmap}
    \BlankLine
    \emph{special treatment of the first line}\;
    \For{$i\leftarrow 2$ \KwTo $l$}{
    \emph{special treatment of the first element of line $i$}\;
    \For{$j\leftarrow 2$ \KwTo $w$}{\label{forins}
    \Left$\leftarrow$ \FindCompress{$Im[i,j-1]$}\;
    \Up$\leftarrow$ \FindCompress{$Im[i-1,]$}\;
    \This$\leftarrow$ \FindCompress{$Im[i,j]$}\;
    \If(\tcp*[h]{O(\Left,\This)==1}){\Left compatible with \This}{\label{lt}
    \lIf{\Left $<$ \This}{\Union{\Left,\This}}
    \lElse{\Union{\This,\Left}}
    }
    \If(\tcp*[f]{O(\Up,\This)==1}){\Up compatible with \This}{\label{ut}
    \lIf{\Up $<$ \This}{\Union{\Up,\This}}
    \tcp{\This is put under \Up to keep tree as flat as possible}\label{cmt}
    \lElse{\Union{\This,\Up}}\tcp*[h]{\This linked to \Up}\label{lelse}
    }
    }
    \lForEach{element $e$ of the line $i$}{\FindCompress{p}}
    }
    \caption{disjoint decomposition}\label{algo_disjdecomp}
\end{algorithm}
\DecMargin{1em}

\end{document}