gridslides.sty

% Package:     gridslides
% Description: LaTeX package to create free form slides with blocks placed on a grid
% File:        gridslides.sty
% Author:      Daniel Mendler <mail@daniel-mendler.de>
% Version:     0.1.1
% Date:        2017-11-28
% License:     GPL2 or LPPL1.3 at your option
% Homepage:    https://github.com/minad/gridslides
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{gridslides}

\RequirePackage{microtype}
\RequirePackage{xkeyval}
\RequirePackage[utf8]{inputenc}
\RequirePackage{tikz}
\RequirePackage[margin=0mm]{geometry}
\RequirePackage{xstring}
\RequirePackage{environ}
\RequirePackage[pdfusetitle,bookmarksopen]{hyperref}
\usetikzlibrary{calc}

\newif\ifGS@grid\GS@gridfalse
\DeclareOptionX{grid}{\GS@gridtrue}

\tikzset{GS@block/.style={}}
\DeclareOptionX{blocks}{\tikzset{GS@block/.style={draw=blue,draw opacity=0.2}}}

\newlength{\GS@gridsize}
\setlength{\GS@gridsize}{4mm}

\def\GS@xsteps{32}
\def\GS@ysteps{24}

\DeclareOptionX{gridsize}{\setlength{\GS@gridsize}{#1}\geometry{paperwidth=\GS@xsteps\GS@gridsize,paperheight=\GS@ysteps\GS@gridsize}}
\DeclareOptionX{xsteps}{\def\GS@xsteps{#1}\geometry{paperwidth=\GS@xsteps\GS@gridsize}}
\DeclareOptionX{ysteps}{\def\GS@ysteps{#1}\geometry{paperheight=\GS@ysteps\GS@gridsize}}

\geometry{paperwidth=\GS@xsteps\GS@gridsize,paperheight=\GS@ysteps\GS@gridsize}

\ProcessOptionsX\relax

% support arrows in overlay
\tikzstyle{every picture}+=[remember picture]

\pagestyle{empty}

\def\GS@xoff{0}
\def\GS@yoff{0}

\long\def\GS@block(#1,#2,#3)#4{%
  \let\oldxoff\GS@xoff%
  \let\oldyoff\GS@yoff%
  \pgfmathsetmacro\xoff{\GS@xoff+#1}%
  \pgfmathsetmacro\yoff{\GS@yoff+#2}%
  \global\let\GS@xoff\xoff%
  \global\let\GS@yoff\yoff%
  \begin{tikzpicture}[overlay,yscale=-1,shift=(current page.north west)]%
    \node[GS@block,rectangle,anchor=north west,inner sep=0pt,text width=#3*\the\GS@gridsize] at (\xoff*\the\GS@gridsize,\yoff*\the\GS@gridsize)%
    {%
      \begingroup%
      #4%
      \endgroup%
    };%
  \end{tikzpicture}%
  \global\let\GS@xoff\oldxoff%
  \global\let\GS@yoff\oldyoff%
}

\def\GS@fig(#1,#2,#3)#4{\GS@block(#1,#2,#3){\includegraphics[width=\textwidth]{#4}}}

\long\def\GS@eq(#1,#2)#3{%
  \GS@block(#1,#2,\GS@xsteps){%
    $\begin{aligned}#3\end{aligned}$%
  }%
}

\long\def\GS@txt(#1,#2)#3{\GS@block(#1,#2,\GS@xsteps){\mbox{#3}}}

\newcounter{GS@totalsteps}
\newcounter{GS@step}

\newcommand{\GS@setsteps}[1]{%
  \ifnum#1>\value{GS@totalsteps}%
    \setcounter{GS@totalsteps}{#1}%
  \fi%
}

\long\def\GS@from<#1->#2#3{%
  \GS@setsteps{#1}%
  \ifnum\value{GS@step}<#1%
    #3%
  \else%
    #2%
  \fi%
 }

\long\def\GS@only<#1-#2>#3#4{%
  \GS@setsteps{#1}%
  \GS@setsteps{#2}%
  \ifnum\value{GS@step}<#1%
    #4%
  \else%
    \ifnum\value{GS@step}>#2%
      #4%
    \else%
      #3%
    \fi%
  \fi%
}

\long\def\alt<#1>#2#3{%
  \IfSubStr{#1}{-}{%
    \IfBeginWith{#1}{-}{%
      \GS@only<1#1>{#2}{#3}%
    }{%
      \IfEndWith{#1}{-}{%
        \GS@from<#1>{#2}{#3}%
      }{%
        \GS@only<#1>{#2}{#3}%
      }%
    }%
  }{%
    \GS@only<#1-#1>{#2}{#3}%
  }%
}

\long\def\only<#1>#2{\alt<#1>{#2}{}}

\long\def\GS@blockhelper#1<#2>(#3)#4{\only<#2>{#1(#3){#4}}}
\def\GS@defblock#1{%
  \long\expandafter\def\csname#1\endcsname{%
    \@ifnextchar<{\GS@blockhelper{\csname GS@#1\endcsname}}{\csname GS@#1\endcsname}%
  }%
}

\GS@defblock{block}
\GS@defblock{fig}
\GS@defblock{eq}
\GS@defblock{txt}

\long\def\GS@cmdhelper#1#2<#3>#4{\alt<#3>{#1{#4}}{#2{#4}}}
\def\GS@cmd#1#2{%
  \expandafter\let\csname GS@#1\expandafter\endcsname\csname#1\endcsname%
  \long\expandafter\def\csname#1\endcsname{%
    \@ifnextchar<{\GS@cmdhelper{\csname GS@#1\endcsname}{#2}}{\csname GS@#1\endcsname}%
  }%
}

\newcommand{\rgb}[1]{\definecolor{GS@rgb}{HTML}{#1}\color{GS@rgb}}

\GS@cmd{textbf}{\relax}
\GS@cmd{textit}{\relax}
\GS@cmd{emph}{\relax}
\GS@cmd{underline}{\relax}
\def\GS@ignore#1{}
\GS@cmd{color}{\GS@ignore}
\GS@cmd{rgb}{\GS@ignore}

\newcounter{slide}
\stepcounter{slide}

\newcommand{\GS@page}[1]{%
  \setcounter{GS@totalsteps}{1}%
  \setcounter{GS@step}{0}%
  \setlength{\parindent}{0pt}%
  \setlength{\parskip}{0pt}%
  \loop\ifnum\value{GS@step}<\value{GS@totalsteps}%
    \stepcounter{GS@step}%
    \clearpage%
    \begingroup%
    #1%
    \endgroup%
    \ifGS@grid%
    \begin{tikzpicture}[overlay,yscale=-1,shift=(current page.north west)]%
      \begin{scope}[x=\the\GS@gridsize,y=\the\GS@gridsize]%
        \draw[opacity=0.2,gray,step=1,line width=0.1pt] (0,0) grid (\GS@xsteps,\GS@ysteps);%
        \draw[opacity=0.2,red,step=8,line width=0.5pt] (0,0) grid (\GS@xsteps,\GS@ysteps);%
      \end{scope}%
    \end{tikzpicture}%
    \fi%
  \repeat%
  \stepcounter{slide}%
}

\newcommand{\bg}[1]{\fig(0,0,\GS@xsteps){#1}}

\def\GS@style{}
\def\theheadline{}

\newcommand{\GS@slide}[2]{%
  \GS@page{%
    \global\def\theheadline{#1}%
    \GS@style%
    #2%
    \ifnum\value{GS@step}=1%
      \pdfbookmark[0]{\theheadline}{slide\theslide}%
    \fi
    \ifnum\value{GS@totalsteps}>1%
      \pdfbookmark[1]{Step \theGS@step}{slide\theslide.step\theGS@step}%
    \fi
  }%
}

\NewEnviron{slide}[1]{\GS@slide{#1}{\BODY}}
\NewEnviron{style}{\global\let\GS@style\BODY}
\NewEnviron{rawslide}{\GS@page{\BODY}}

\newcommand{\institute}[1]{\newcommand\@institute{#1}}
\newcommand{\theauthor}{\@author}
\newcommand{\thedate}{\@date}
\newcommand{\thetitle}{\@title}
\newcommand{\theinstitute}{\@institute}

\endinput