%%
%% This is file `background.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% background.dtx  (with options: `package')
%% 
%% Copyright (C) 2009, 2012, 2014 Gonzalo Medina (gmedinaar@unal.edu.co)
%% 
%% --------------------------------------------------------------------------
%% 
%% This work may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%% The latest version of this license is in
%%   http://www.latex-project.org/lppl.txt
%% and version 1.3 or later is part of all distributions of LaTeX
%% version 2003/12/01 or later.
%% 
%% This work has the LPPL maintenance status "maintained".
%% 
%% The Current Maintainer of this work is Gonzalo Medina.
%% 
%% This work consists of the files background.ins, background.dtx,
%% and the derived files background.sty and background.pdf.
%% 










\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{background}[2014/03/04 v2.1 background material]
\@ifpackageloaded{xkeyval}{}{\RequirePackage{xkeyval}}
\@ifpackageloaded{tikz}{}{\RequirePackage{tikz}}
\@ifpackageloaded{everypage}{}{\RequirePackage{everypage}}
\@ifpackageloaded{afterpage}{}{\RequirePackage{afterpage}}
\DeclareOptionX[BG]<background>{contents}{%
  \def\Background@Contents{#1}}
\DeclareOptionX[BG]<background>{color}{%
  \def\Background@Color{#1}}
\DeclareOptionX[BG]<background>{angle}{%
  \def\Background@Angle{#1}}
\DeclareOptionX[BG]<background>{opacity}{%
  \def\Background@Opacity{#1}}
\DeclareOptionX[BG]<background>{scale}{%
  \def\Background@Scale{#1}}
\DeclareOptionX[BG]<background>{position}{%
  \def\Background@Position{#1}}
\DeclareOptionX[BG]<background>{anchor}{%
  \def\Background@Anchor{#1}}
\DeclareOptionX[BG]<background>{nodeanchor}{%
  \def\Background@NodeAnchor{#1}}
\DeclareOptionX[BG]<background>{hshift}{%
  \def\Background@HShift{#1}}
\DeclareOptionX[BG]<background>{vshift}{%
  \def\Background@VShift{#1}}

\newif\ifbg@some
  \bg@somefalse

\define@choicekey+[BG]{background}{pages}[\val\nr]{all,some}{%
  \ifcase\nr\relax
    \bg@somefalse
  \or
    \bg@sometrue
  \fi
}{%
  \PackageWarning{background}{erroneous input ignored}%
}

\define@choicekey+[BG]{background}{placement}[\val\nr]{center,bottom,top}{%
  \ifcase\nr\relax
    \renewcommand\Background@Position{current page.center}%
    \renewcommand\Background@Anchor{}%
    \renewcommand\Background@Angle{60}
  \or
    \renewcommand\Background@Position{current page.south}%
    \renewcommand\Background@Anchor{above}%
    \renewcommand\Background@Angle{0}%
  \or
    \renewcommand\Background@Position{current page.north}%
    \renewcommand\Background@Anchor{below}%
    \renewcommand\Background@Angle{0}%
  \fi
}{%
  \PackageWarning{background}{erroneous input ignored}%
}
\define@boolkey+[BG]{background}{firstpage}{%
  \ifBG@background@firstpage
    \bg@sometrue%
    \AtBeginDocument{\BgThispage}%
  \else
    \bg@somefalse%
  \fi
}{%
  \PackageWarning{background}{erroneous input ignored}%
}

\DeclareOptionX[BG]<background>{all}{\bg@somefalse}
\DeclareOptionX[BG]<background>{some}{\bg@sometrue}
\DeclareOptionX[BG]<background>{center}{%
  \renewcommand\Background@Position{current page.center}%
  \renewcommand\Background@Anchor{}%
  \renewcommand\Background@Angle{60}}
\DeclareOptionX[BG]<background>{bottom}{%
  \renewcommand\Background@Position{current page.south}%
  \renewcommand\Background@Anchor{above}%
  \renewcommand\Background@Angle{0}%
  \renewcommand\Background@Scale{8}}
\DeclareOptionX[BG]<background>{top}{%
  \renewcommand\Background@Position{current page.north}%
  \renewcommand\Background@Anchor{below}%
  \renewcommand\Background@Angle{0}%
  \renewcommand\Background@Scale{8}}


\ExecuteOptions{all,center}


\DeclareOptionX*{\PackageWarningNoLine{background}{Option '\CurrentOption' ignored}}

\ExecuteOptionsX[BG]<background>{%
  firstpage=false,
  contents=Draft,%
  color=red!45,%
  angle=60,%
  opacity=0.5,%
  scale=10,%
  position=current page.center,%
  anchor={},%
  nodeanchor={center},%
  hshift=0pt,%
  vshift=0pt%
}

\ProcessOptionsX[BG]<background>
\DeclareRobustCommand*\backgroundsetup[1]{%
  \setkeys[BG]{background}{#1}
}

\newcommand\bg@material{%
  \begin{tikzpicture}[remember picture,overlay,scale=\Background@Scale]
  \node[
    rotate=\Background@Angle,
    scale=\Background@Scale,
    opacity=\Background@Opacity,
    anchor=\Background@NodeAnchor,
    xshift=\Background@HShift,
    yshift=\Background@VShift,
    color=\Background@Color,
    inner sep=0pt
    ]
    at (\Background@Position) [\Background@Anchor]
      {\Background@Contents};
  \end{tikzpicture}}%
\newcommand\BgThispage{\AddThispageHook{\bg@material}}

\newcommand\NoBgThispage{%
  \let\oldbg@material\bg@material\renewcommand\bg@material{}%
  \afterpage{\AddEverypageHook{\oldbg@material}}}

\ifbg@some
  \AddThispageHook{}
\else
  \AddEverypageHook{\bg@material}
\fi

\newcommand\SetBgContents[1]{%
  \def\Background@Contents{#1}}
\newcommand\SetBgAngle[1]{%
  \def\Background@Angle{#1}}
\newcommand\SetBgColor[1]{%
  \def\Background@Color{#1}}
\newcommand\SetBgScale[1]{%
  \def\Background@Scale{#1}}
\newcommand\SetBgVshift[1]{%
  \def\Background@VShift{#1}}
\newcommand\SetBgHshift[1]{%
  \def\Background@HShift{#1}}
\newcommand\SetBgPosition[1]{%
  \def\Background@Position{#1}}
\newcommand\SetBgAnchor[1]{%
  \def\Background@Anchor{#1}}
\newcommand\SetBgOpacity[1]{%
  \def\Background@Opacity{#1}}

\let\BgMaterial\bg@material

\AtEndDocument{\clearpage}
\endinput
%%
%% End of file `background.sty'.
