Code:
\documentclass{scrartcl}
\usepackage{tikz}
\usetikzlibrary{math,fit}
\begin{document}
\directlua{
r = 2
cx = {0+math.random(-r,r)/10,
1+math.random(-r,r)/10,
2+math.random(-r,r)/10,
3+math.random(-r,r)/10,
4+math.random(-r,r)/10,
0+math.random(-r,r)/10,
1+math.random(-r,r)/10,
2+math.random(-r,r)/10,
3+math.random(-r,r)/10,
4+math.random(-r,r)/10,
0+math.random(-r,r)/10,
1+math.random(-r,r)/10,
2+math.random(-r,r)/10,
3+math.random(-r,r)/10,
4+math.random(-r,r)/10}
cy = {0+math.random(-r,r)/10,
0-math.random(-r,r)/10,
0-math.random(-r,r)/10,
0-math.random(-r,r)/10,
0-math.random(-r,r)/10,
-1+math.random(-r,r)/10,
-1+math.random(-r,r)/10,
-1+math.random(-r,r)/10,
-1+math.random(-r,r)/10,
-1+math.random(-r,r)/10,
-2+math.random(-r,r)/10,
-2+math.random(-r,r)/10,
-2+math.random(-r,r)/10,
-2+math.random(-r,r)/10,
-2+math.random(-r,r)/10}
fit={1,2,3,4,5,10,6,7,11,8,12,13,9,14,15}
}
\newpage
\begin{tikzpicture}
\draw[rounded corners = 5pt](-0.75,-3.5)--(4.75,-3.5)--(4.75,0.75)--(-0.75,0.75)--cycle;
\foreach \n in {1,...,15}{
\node (\n) at (\directlua{tex.print(cx[\n])},\directlua{tex.print(cy[\n])}){x};
}
\foreach \n in {1,4,7,10,13}{
\tikzmath{%//
\nz = int(\n+1);
\nd = int(\n+2);
}%\\
\node[draw=green, fit=(\directlua{tex.print(fit[\n])}) (\directlua{tex.print(fit[\n+1])})(\directlua{tex.print(fit[\n+2])}),inner sep=0mm](FIt2) {};
}
\end{tikzpicture}
\end{document}
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