Harada Method LaTeX Template

harada_template.tex

\documentclass[a4paper,landscape]{article}
\usepackage[left=2cm,right=2cm,top=1.5cm,bottom=1.5cm]{geometry}
\usepackage{xcolor}
\usepackage{textcomp}
\usepackage{hyperref}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}

\newcommand{\HaradaGrid}{%
  \begin{tikzpicture}[baseline=(current bounding box.center),
    x=1.9cm,y=1.9cm,>=Stealth,
    thickgrid/.style={line width=1.5pt,gray!80},
    subgrid/.style={line width=3pt,black},
    finegrid/.style={gray!20, line width=0.25pt},
    arrowstyle/.style={->,gray!65,line width=1pt}
  ]
    % Outer frame - same thickness as central block
    \draw[black, line width=4.5pt] (0,0) rectangle (9,9);
    % Subgrid 3x3 separators
    \draw[subgrid] (3,0) -- (3,9);
    \draw[subgrid] (6,0) -- (6,9);
    \draw[subgrid] (0,3) -- (9,3);
    \draw[subgrid] (0,6) -- (9,6);

    % Outer block 3x3 internal grid lines
    % Top row blocks
    \draw[thickgrid] (1,6) -- (1,9);  % Top-left vertical
    \draw[thickgrid] (2,6) -- (2,9);  % Top-left vertical
    \draw[thickgrid] (0,7) -- (3,7);  % Top-left horizontal
    \draw[thickgrid] (0,8) -- (3,8);  % Top-left horizontal
    \draw[thickgrid] (4,6) -- (4,9);  % Top-center vertical
    \draw[thickgrid] (5,6) -- (5,9);  % Top-center vertical
    \draw[thickgrid] (3,7) -- (6,7);  % Top-center horizontal
    \draw[thickgrid] (3,8) -- (6,8);  % Top-center horizontal
    \draw[thickgrid] (7,6) -- (7,9);  % Top-right vertical
    \draw[thickgrid] (8,6) -- (8,9);  % Top-right vertical
    \draw[thickgrid] (6,7) -- (9,7);  % Top-right horizontal
    \draw[thickgrid] (6,8) -- (9,8);  % Top-right horizontal
    % Middle row blocks
    \draw[thickgrid] (1,3) -- (1,6);  % Middle-left vertical
    \draw[thickgrid] (2,3) -- (2,6);  % Middle-left vertical
    \draw[thickgrid] (0,4) -- (3,4);  % Middle-left horizontal
    \draw[thickgrid] (0,5) -- (3,5);  % Middle-left horizontal
    \draw[thickgrid] (7,3) -- (7,6);  % Middle-right vertical
    \draw[thickgrid] (8,3) -- (8,6);  % Middle-right vertical
    \draw[thickgrid] (6,4) -- (9,4);  % Middle-right horizontal
    \draw[thickgrid] (6,5) -- (9,5);  % Middle-right horizontal
    % Bottom row blocks
    \draw[thickgrid] (1,0) -- (1,3);  % Bottom-left vertical
    \draw[thickgrid] (2,0) -- (2,3);  % Bottom-left vertical
    \draw[thickgrid] (0,1) -- (3,1);  % Bottom-left horizontal
    \draw[thickgrid] (0,2) -- (3,2);  % Bottom-left horizontal
    \draw[thickgrid] (4,0) -- (4,3);  % Bottom-center vertical
    \draw[thickgrid] (5,0) -- (5,3);  % Bottom-center vertical
    \draw[thickgrid] (3,1) -- (6,1);  % Bottom-center horizontal
    \draw[thickgrid] (3,2) -- (6,2);  % Bottom-center horizontal
    \draw[thickgrid] (7,0) -- (7,3);  % Bottom-right vertical
    \draw[thickgrid] (8,0) -- (8,3);  % Bottom-right vertical
    \draw[thickgrid] (6,1) -- (9,1);  % Bottom-right horizontal
    \draw[thickgrid] (6,2) -- (9,2);  % Bottom-right horizontal

    % Outer block centers (gray squares - no internal grid, just border)
    \foreach \x/\y in {
      1/7, 4/7, 7/7,
      1/4,       7/4,
      1/1, 4/1, 7/1
    }{
      \fill[gray!20] (\x,\y) rectangle (\x+1,\y+1);
      \draw[gray!80, line width=1.1pt] (\x,\y) rectangle (\x+1,\y+1);
    }

    % Shaded 3x3 block centered - clear 3x3 grid
    \fill[gray!20] (3,3) rectangle (6,6);
    \fill[yellow!60] (4,4) rectangle (5,5); % center goal highlighted
    % Extra thick black border for central block
    \draw[black, line width=4.5pt] (3,3) rectangle (6,6);
    % Inner 3x3 grid lines - clearly marked
    \draw[thickgrid] (4,3) -- (4,6);
    \draw[thickgrid] (5,3) -- (5,6);
    \draw[thickgrid] (3,4) -- (6,4);
    \draw[thickgrid] (3,5) -- (6,5);

    % Arrows from center ring cells to gray squares in outer blocks (edge to edge)
    \draw[arrowstyle] (4.5,6) -- (4.5,7);  % top-center: top edge -> bottom edge
    \draw[arrowstyle] (6,6) -- (7,7);      % top-right: top-right corner -> bottom-left corner
    \draw[arrowstyle] (6,4.5) -- (7,4.5); % middle-right: right edge -> left edge
    \draw[arrowstyle] (6,3) -- (7,2);     % bottom-right: bottom-right corner -> top-left corner
    \draw[arrowstyle] (4.5,3) -- (4.5,2); % bottom-center: bottom edge -> top edge
    \draw[arrowstyle] (3,3) -- (2,2);     % bottom-left: bottom-left corner -> top-right corner
    \draw[arrowstyle] (3,4.5) -- (2,4.5);  % middle-left: left edge -> right edge
    \draw[arrowstyle] (3,6) -- (2,7);     % top-left: top-left corner -> bottom-right corner
  \end{tikzpicture}%
}

\begin{document}
\thispagestyle{empty}
\begin{tikzpicture}[remember picture,overlay]
\node[anchor=south,inner sep=0.5cm] at (current page.south) {\Large \textcolor{black}{Created by: \href{https://www.adithyan.io}{adithyan.io} \textbar{} \href{https://www.adithyan.io/blog/harada-method-worksheet\#latex-source}{LaTeX Source} \textbar{} \href{https://www.adithyan.io/blog/harada-method-worksheet\#interactive-online-builder}{Interactive Online Builder}}};
\end{tikzpicture}
\begin{center}
\vspace*{\fill}
\HaradaGrid
\vspace*{\fill}
\end{center}
\end{document}