Triangular protractor with TikZ

Following latex code will create a triangular protractor below:

\documentclass[margin=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc, intersections}
\tikzset{
numbers/.style={fill=white,font=\scriptsize},
degrees/.style={below, anchor=north, text centered, inner ysep=2pt, text width=5mm, rotate=\mnum-270, fill=white, font=\scriptsize}
}

\begin{document}
\begin{tikzpicture}%[transform shape, rotate=90] % uncomment for rotating picture

% finding right angle \path[name path=line 1] (-8,0) --++ (-45:11.5);
\path[name path=line 2] (8,0) --++ (225:11.5);

% draw border
\draw[line width=.3pt, name path=border, name intersections={of=line 1 and line 2,by=A}] (A) -- (8,0) coordinate (B) -- (-8,0) coordinate (C) -- cycle;

% top ruler
\foreach \tnum in {-7,-6,...,7}{
\pgfmathtruncatemacro\tnuma{abs(\tnum)}
\draw (\tnum,0) -- (\tnum,-.2) node[numbers, below] (n\tnum) {\tnuma};
\ifnum\tnum<7
\draw (\tnum+.5,0) -- (\tnum+.5,-.2);
\else\fi
}
\foreach \tick in {-7,-6.9,...,7}{
\draw (\tick,0) -- (\tick,-.1);
}

% protractor
\path[name path=prot] (-4.5,-.2) arc (180:360:4.5);
% lower degrees
\foreach \lnum [count=\xi] in {185,...,355}{
\draw (\lnum:4.5) -- (\lnum:4.6) coordinate (j\xi);
%
\path[name path=minor\xi] (j\xi) -- (\lnum:8.2);
\draw[name intersections={of=border and minor\xi,by=k\xi}] (k\xi) --++ (\lnum:-1mm);
%
\pgfmathsetmacro\ticks{int(mod(\lnum,5))}
\ifnum0=\ticks\relax
\draw (k\xi) --++ (\lnum:-2mm);
\draw (\lnum:4.5) -- (\lnum:4.7);
\else\fi
%
\ifnum\xi=41
\draw[gray] (k\xi) -- (0,0);
\else
\ifnum\xi=131
\draw[gray] (k\xi) -- (0,0);
\else
\fi
\fi
}

\foreach \mnum [count=\xi, count=\xx starting from 2] in {190,200,...,350}{
\pgfmathtruncatemacro\top{190-(10*\xx)}
\pgfmathtruncatemacro\bottom{10*\xi}
\ifnum\top=90
\draw (\mnum:4.5) -- (\mnum:4.7)
node[degrees] (i\xi) {\top};
\else
\draw (\mnum:4.5) -- (\mnum:4.7)
node[degrees] (i\xi) {\top\\\bottom};
\fi
\path[name path=main\xi] (i\xi) -- (\mnum:8.2);
\draw[name intersections={of=border and main\xi,by=o\xi}] (i\xi.south) -- (o\xi);
% you can use this to set a node at the right angle, or delete it.
\ifnum\xi=9
\path (i\xi.south) -- (o\xi);
\else\fi
}

% central part
\fill[white] (-2.6,-3.5) rectangle (-2,-.5);
\fill[white] (2,-3.5) rectangle (2.6,-.5);

\draw[white, line width=1mm, double=black, double distance=1pt] (n0.south) -- (0,-3.5) node[below, anchor=north, text width=3cm, text=black, yshift=-2.5mm, text entered, font=\scriptsize\bfseries\sffamily] {Alenanno engineering};

\foreach \cnum in {0,1,2,3}{
\pgfmathtruncatemacro\cnuma{abs(\cnum)}
\ifnum\cnum>0
\draw (-2.5,-\cnum) -- (-2.3,-\cnum) node[numbers, right] (l\cnum) {\cnuma};
\draw (2.5,-\cnum) -- (2.3,-\cnum) node[numbers, left] (r\cnum) {\cnuma};
%
\draw[white, line width=1mm, double=black, double distance=1pt] (l\cnum) -- (r\cnum);
\draw[white, line width=1mm, double=black, double distance=1pt] (-2.2,-\cnum-.5) -- (2.2,-\cnum-.5);
\fill[white] (0,-\cnum-.5) circle (1mm);
\else\fi
\draw (-2.5,-\cnum-.5) -- (-2.3,-\cnum-.5);
\draw (2.5,-\cnum-.5) -- (2.3,-\cnum-.5);
}

\foreach \mtick in {-.3,-.4,...,-3.4}{
\draw (-2.5,\mtick) -- (-2.4,\mtick);
\draw (2.5,\mtick) -- (2.4,\mtick);
}
\end{tikzpicture}
\end{document}