Text Formatting ⇒ algorithms | Colored horizontal Lines for Algorithms

[carlosborrego]

Hello,

I would like to color the horizontal lines of the algorithm environment from the algorithms package. Is there a way I can do this?


Thanks so much!
Carlos

[localghost]

Does the algorithms manual give no hints for customization?


Best regards and welcome to the board
Thorsten

[carlosborrego]

Thanks Thorsten,
No, unfortunately it does not.
Thank you very much
Carlos

[localghost]

As I found out in the meantime, the »algorithm« package from algorithms relies on the float package to style the algorithm environment. So it would be necessary to do modifications to those mechanisms. At the moment I have no idea how.

[carlosborrego]

Thanks so much localghost, but I am not able to find any information about it in the float manual page. Any other ideas?
Thanks
Carlos

[cgnieder]

One could define a new floatstyle and restyle the algorithm float:

Code: Select all

\documentclass{article}
\usepackage{algorithmic,algorithm}
\usepackage{xcolor}

\makeatletter
% this is a copy of the original \fs@ruled but with {\color{blue} ... } added:
\newcommand\fs@coloruled{\def\@fs@cfont{\bfseries}\let\@fs@capt\floatc@ruled
  \def\@fs@pre{{\color{blue}\hrule height.8pt depth0pt }\kern2pt}%
  \def\@fs@post{\kern2pt{\color{blue}\hrule}\relax}%
  \def\@fs@mid{\kern2pt{\color{blue}\hrule}\kern2pt}%
  \let\@fs@iftopcapt\iftrue}
\makeatother

% now use the new style:
\floatstyle{coloruled}
\restylefloat{algorithm}

\begin{document}

% let's see if it works:
\begin{algorithm}
 \caption{Calculate $y = x^n$}
 \label{alg1}
 \begin{algorithmic}
 \REQUIRE $n \geq 0 \vee x \neq 0$
 \ENSURE $y = x^n$
 ...
 \end{algorithmic}
\end{algorithm}

\end{document}

Regards

BTW: the documentation of the algorithms bundle could mention somewhere that its packages are called »algorithm« and »algorithmic« and that one needs to load both...

[carlosborrego]

Thank you very much! Works like a charm!
Carlos