assi in tikz

non mi era mai captato di inserire un sistema di riferimento
ho risolto così
ho fatto bene ?
ho si poteva fare meglio?
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% Tikz File 'mytikz.tex'
\documentclass{standalone}
\usepackage{tkz-euclide}
\usetkzobj{all}
\usepackage{circuitikz}
\usepackage{tkz-tab}
\usepackage{tkz-linknodes}
\usetikzlibrary{calc}
\usetikzlibrary{hobby}
\usepackage{pgfplots}
\usetikzlibrary{decorations}
\usetikzlibrary{shapes,arrows,trees,positioning,through,intersections}
\usetikzlibrary{shapes.gates.logic.US,shapes.gates.logic.IEC}
%\usepackage[subpreambles=true,sort=true,print=true]{standalone}
\usepackage{standalone}
\standaloneconfig{ mode=image|tex }
\begin{document}

\begin{tikzpicture}[>=triangle 45] %, x=0.8cm,y=0.8cm]
% draw the coordinates
\pgfmathsetmacro{\raggio}{10};
\pgfmathsetmacro{\mraggio}{\raggio/3};
\pgfmathsetmacro{\qraggio}{\raggio/5};
\pgfmathsetmacro{\sraggio}{1.9*\raggio};
% draw the unit circle
\draw[->] (0,-\raggio-\mraggio) — (0,\raggio+\mraggio) node[above,fill=white] {$y$};
\draw[->] (-\raggio-\mraggio,0) — (\raggio+\mraggio,0) node[right,fill=white] {$x$};
\draw[very thick] (0,0) circle(\raggio);

\foreach \y/\ztext in {-9/-0.9,-8/-0.8,-7/-0.7,-6/-0.6, -5/-0.5,-4/-0.4,-3/-0.3,-2/-0.2,-1/-0.1,1/0.1,2/0.2,3/0.3,4/0.4,5/0.5,6/0.6,7/0.7,8/0.8,9/0.9}
\draw[very thick] (-0.1,\y cm) — (0.1,\y cm) node

{$\ztext$};
\foreach \x/\ztext in {-9/-0.9,-8/-0.8,-7/-0.7,-6/-0.6, -5/-0.5,-4/-0.4,-3/-0.3,-2/-0.2,-1/-0.1,1/0.1,2/0.2,3/0.3,4/0.4,5/0.5,6/0.6,7/0.7,8/0.8,9/0.9}
\draw[very thick] (\x cm,-0.1) — (\x cm,0.1) node[below=.15cm] {$\ztext$};
\node (oo) at (0,0)[below right=.18cm] {$0$};
\node (oa) at (0,-10)[below left=.18cm] {$-1$};
\node (ob) at (0,10)[above left=.18cm] {$1$};
\node (oc) at (10,0)[below right=.18cm] {$1$};
\node (oc) at (-10,0)[below left=.18cm] {$-1$};
\end{tikzpicture}

\end{document}
Il preambolo non è minimale 🙂 ovviamente
ciao
claudio
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