% !TeX root = ./test.tex
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% This is the TikZbricks package
% A package to draw bricks with tikz
% Maintained by samcarter
%
% Project repository and bug tracker:
% https://github.com/samcarter/TikZbricks
%
% Released under the LaTeX Project Public License v1.3c or later
% See https://www.latex-project.org/lppl.txt
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ProvidesPackage{tikzbricks}[2024/12/16 version v0.6 Drawing bricks with TikZ]

\RequirePackage{tikz}
\RequirePackage{tikz-3dplot}
\RequirePackage{xkeyval}

% setting a default viewpoint
\tdplotsetmaincoords{70}{160}

% setting default values
\DeclareOptionX{color}[red]{\def\brick@default@color{#1}}
\DeclareOptionX{frontcolor}[\brick@color!60]{\def\brick@default@frontcolor{#1}}
\DeclareOptionX{topcolor}[\brick@color!40]{\def\brick@default@topcolor{#1}}
\DeclareOptionX{sidecolor}[\brick@color]{\def\brick@default@sidecolor{#1}}
\DeclareOptionX{studcolor}[\brick@color]{\def\brick@default@studcolor{#1}}
\DeclareOptionX{brickheight}[1.3]{\def\brick@default@height{#1}}
\DeclareOptionX{bricklength}[1.0]{\def\brick@default@length{#1}}
\DeclareOptionX{bricktext}[]{\def\brick@default@facetext{#1}}
\DeclareOptionX{brickwidth}[1.0]{\def\brick@default@width{#1}}
\DeclareOptionX{studradius}[0.35]{\def\brick@default@radius{#1}}
\DeclareOptionX{studheight}[0.3]{\def\brick@default@studheight{#1}}
\DeclareOptionX{studtext}[]{\def\brick@default@text{#1}}


\ExecuteOptionsX{color,frontcolor,topcolor,sidecolor,studcolor,brickheight,bricklength,bricktext,brickwidth,studradius,studheight,studtext}

\ProcessOptionsX

% counter to dermine the position of a brick in a wall
\newcounter{brickx}
\newcounter{bricky}
\newcounter{brickz}

% draw a standalone brick
% 1: optional argument
% 2: lenght
% 3: width
\newcommand*{\brick}[3][]{%
 \setcounter{brickx}{0}%
 \setcounter{bricky}{0}%
 \setcounter{brickz}{0}%
 \begin{scope}%
   \tikzset{/brick/.cd,#1}%
   \brick@draw{#2}{#3}%
 \end{scope}%
}

% draw a brick in a wall
% 1: optional argument
% 2: lenght
% 3: width
\newcommand*{\wallbrick}[3][]{%
 \begin{scope}%
   \tikzset{/brick/.cd,#1}%
   \brick@draw{#2}{#3}%
 \end{scope}%
 \addtocounter{brickx}{#2}%
}

% envrinoment to arange the bricks in a wall
% 1: optional argument passed to the tikzpicture
\newenvironment{wall}[1][]{%
 \setcounter{brickx}{0}%
 \setcounter{bricky}{0}%
 \setcounter{brickz}{0}%
 \newcommand{\newrow}{%
   \setcounter{brickx}{0}%
   \addtocounter{brickz}{1}%
 }%
 \begin{tikzpicture}[#1]
}{%
 \end{tikzpicture}%
}

\tikzset{
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % Pass unknown keys on to tikz
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 /brick/.search also={/tikz,/pgf},
 /brick/.cd,
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % brick options
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 color/.code         = \def\brick@color{#1},
 color               = \brick@default@color,
 frontcolor/.code    = \def\brick@frontcolor{#1},
 frontcolor          = \brick@default@frontcolor,
 topcolor/.code      = \def\brick@topcolor{#1},
 topcolor            = \brick@default@topcolor,
 sidecolor/.code     = \def\brick@sidecolor{#1},
 sidecolor           = \brick@default@sidecolor,
 studcolor/.code     = \def\brick@studcolor{#1},
 studcolor           = \brick@default@studcolor,
 brickheight/.code   = \def\brick@height{#1},
 brickheight         = \brick@default@height,
 bricklength/.code   = \def\brick@length{#1},
 bricklength         = \brick@default@length,
 bricktext/.code     = \def\brick@facetext{#1},
 bricktext           = \brick@default@facetext,
 brickwidth/.code    = \def\brick@width{#1},
 brickwidth          = \brick@default@width,
 studradius/.code    = \def\brick@radius{#1},
 studradius          = \brick@default@radius,
 studheight/.code    = \def\brick@studheight{#1},
 studheight          = \brick@default@studheight,
 studtext/.code      = \def\brick@text{#1},
 studtext            = \brick@default@text,
}

\newcommand{\brick@draw}[2]{%
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % store the current scale factor
 % from https://github.com/samcarter/tikzlings/issues/3#issuecomment-461373494
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \pgfgettransformentries{\tmpscaleA}{\tmpscaleB}{\tmpscaleC}{\tmpscaleD}{\tmp}{\tmp}%
 \pgfmathsetmacro{\scalingfactor}{sqrt(abs(\tmpscaleA*\tmpscaleD-\tmpscaleB*\tmpscaleC))*sqrt(abs((\pgf@xx/1cm)*(\pgf@yy/1cm)-(\pgf@xy/1cm)*(\pgf@yx/1cm)))}%
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % Drawing the brick
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{scope}[tdplot_main_coords]

   % Drawing faces
  \pgfmathparse{sign(sin(\tdplotmainphi))}
  \let\brick@sin\pgfmathresult
  \pgfmathparse{sign(cos(\tdplotmainphi))}
  \let\brick@cos\pgfmathresult

   \ifnum\brick@sin<0
     % Right
     \fill[\brick@sidecolor,thick]
       (
         \brick@length*\value{brickx},
         \brick@width*\value{bricky},
         \brick@height*\value{brickz}
       )
       -- ++(0,0,\brick@height)
       -- ++(0,\brick@width*#2,0)
       -- ++(0,0,-\brick@height)
       -- cycle;
   \else
     % Left
     \fill[\brick@sidecolor,thick]
       (
         {\brick@length*(#1+\value{brickx})},
         \brick@width*\value{bricky},
         \brick@height*\value{brickz}
       )
       -- ++(0,0,\brick@height)
       -- ++(0,\brick@width*#2,0)
       -- ++(0,0,-\brick@height)
       -- cycle;
   \fi

   \ifnum\brick@cos<0
     % Front
     \fill[\brick@frontcolor,thick]
       (
         \brick@length*\value{brickx},
         {\brick@width*(#2+\value{bricky})},
         \brick@height*\value{brickz}
       )
       -- ++(\brick@length*#1,0,0)
       -- ++(0,0,\brick@height)
       -- ++(-\brick@length*#1,0,0)
       -- cycle;

       \node[align=center, transform shape, canvas is zx plane at y=0, rotate=-90] at (
           \brick@length*\value{brickx} + 0.5*\brick@length*#1,
           {\brick@width*(#2+\value{bricky})},
           \brick@height*\value{brickz} + 0.5*\brick@height
       ) {\brick@facetext};

   \else
     % Back
     \fill[\brick@frontcolor,thick]
       (
         \brick@length*\value{brickx},
         \brick@width*\value{bricky},
         \brick@height*\value{brickz}
       )
       -- ++(\brick@length*#1,0,0)
       -- ++(0,0,\brick@height)
       -- ++(-\brick@length*#1,0,0)
       -- cycle;
   \fi

   % Top
   \fill[\brick@topcolor,thick]
     (
       \brick@length*\value{brickx},
       \brick@width*\value{bricky},
       {\brick@height*(1+\value{brickz})}
     )
     -- ++(0,\brick@width*#2,0)
     -- ++(\brick@length*#1,0,0)
     -- +(0,-\brick@width*#2,0)
     -- cycle;



   % Drawing studs
   \foreach \x in {1,...,#1}{
     \foreach \y in {1,...,#2}{

       % Bottom circle
       \fill[\brick@studcolor]
         (
           {\brick@length*(\x-0.5+\value{brickx})},
           {\brick@width*(\y-0.5+\value{bricky})},
           {\brick@height*(1+\value{brickz})}
         )
         circle [radius=\brick@radius];

       % Rectangular stem
       \fill[\brick@studcolor]
         (
           {\brick@length*(\x-0.5+\value{brickx})},
           {\brick@width*(\y-0.5+\value{bricky})},
           {\brick@height*(1+\value{brickz})}
         )
         ++(canvas cs:x=-\brick@radius/0.35*10)
         -- ++(canvas cs:y=\brick@studheight*17.8)
         -- ++(canvas cs:x=\brick@radius/0.35*20)
         -- ++(canvas cs:y=-\brick@studheight*17.8);

       % Top circle with text
       \fill[\brick@topcolor]
         (
           {\brick@length*(\x-0.5+\value{brickx})},
           {\brick@width*(\y-0.5+\value{bricky})},
           {\brick@height*(1+\value{brickz})}
         )
         ++(canvas cs:y=\brick@studheight*17.8)
         circle [radius=\brick@radius]
         node[\brick@color,scale=\scalingfactor*0.5, font=\sffamily] {\brick@text};

     }
   }

 \end{scope}
}

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