dot-grid.sty

% dot-grid.sty
\ProvidesPackage{dot-grid}[2017/08/11 Dot Grid Paper]

% Load packages
\RequirePackage{geometry}
\RequirePackage{tikz}
\RequirePackage{xcolor}

%% Global landscape option
\newif\if@dotlandscape\@dotlandscapefalse
\DeclareOption{landscape}{\@dotlandscapetrue}

%% Global DIN A4 option
\newif\if@dotdinafour\@dotdinafourfalse
\DeclareOption{a4paper}{\@dotdinafourtrue}

%% Global DIN A6 option
\newif\if@dotdinasix\@dotdinasixfalse
\DeclareOption{a6paper}{\@dotdinasixtrue}

%% 'dotmargin' option
\newif\if@dotmargin\@dotmarginfalse
\DeclareOption{dotmargin}{\@dotmargintrue}

%% 'dotfull' option
\DeclareOption{dotfull}{\@dotmarginfalse}

\ProcessOptions\relax

% Set fixed margins
\geometry{right=0in, bottom=0in, left=0.24in, nohead, nofoot}

% Calculate margins and number of dots based on options and orientation
\if@dotlandscape
  \if@dotmargin
    % landscape with margin
    \geometry{top=0.74in}
    \def\@dotnumx{43}
    \def\@dotnumy{31}
  \else
    % landscape without margin
    \geometry{top=0.24in}
    \def\@dotnumx{43}
    \def\@dotnumy{33}
  \fi
\else
  \if@dotdinafour
    \if@dotmargin
      % A4 with margin
      \geometry{top=0.74in}
      \def\@dotnumx{32}
      \def\@dotnumy{43}
    \else
      % A4 without margin
      \geometry{top=0.24in}
      \def\@dotnumx{32}
      \def\@dotnumy{46}
    \fi
  \else
    \if@dotdinasix
      \if@dotmargin
        % A6 with margin
        \geometry{top=0.74in}
        \def\@dotnumx{15}
        \def\@dotnumy{20}
      \else
        % A6 without margin
        \geometry{top=0.24in}
        \def\@dotnumx{15}
        \def\@dotnumy{22}
      \fi
    \else
      \if@dotmargin
        % portrait with margin
        \geometry{top=0.74in}
        \def\@dotnumx{33}
        \def\@dotnumy{41}
      \else
        % portrait without margin
        \geometry{top=0.24in}
        \def\@dotnumx{33}
        \def\@dotnumy{43}
      \fi
    \fi
  \fi
\fi

% Avoid initial horizontal space
\setlength\parindent{0pt}

% No page numbers
\pagestyle{empty}

% Colors
\definecolor{white}{RGB}{255,255,255}
\definecolor{antique}{RGB}{255,255,244}
\definecolor{dotcolor}{RGB}{204,204,198}

% Define dot grid macro
\newcommand{\dotgrid}{\begin{tikzpicture}[x=0.25in, y=0.25in]
    \foreach \x in {1, ..., \@dotnumx}{
      \foreach \y in {1, ..., \@dotnumy}{
        \fill[dotcolor] (\x,\y) circle[radius=0.01in];
      }
    }
  \end{tikzpicture}}