\documentclass[tikz]{standalone}
\usepackage[utf8x]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[light, largesmallcaps]{kpfonts}
\documentclass[tikz,border=5mm]{standalone}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{positioning,decorations.text}
\begin{document}
\fontfamily{jkpss}\selectfont{}
\begin{tikzpicture}
\draw [<->, > = stealth, red] (0, 0) -- (2, 0) node [midway, fill = white] {1} ;
[
\draw [yshift yshift = -12, >-< ,
> = stealth,
red,
shorten >=-3pt, % <- changement
shorten <=-3pt] <=-3pt, % <- changement
] (0, 0) -- (2, 0) node [midway, fill = white] {2} ;
\draw [yshift = -24, >-<, > = stealth, red] (-0.1, 0) -- (2.1, 0) node [midway, fill = white] {3} ;
\draw [line width = 0.1] (0, 0.1) -- (0, -1) ;
\draw [line width = 0.1] (2, 0.1) -- (2, -1) ;
\draw [densely dotted, line width = 0.1] (0.1, -0.3) -- (0.1, -0.6) ;
\draw [densely dotted, line width = 0.1] (1.9, -0.3) -- (1.9, -0.6) ;
\end{tikzpicture}
\end{document}\end{document}
![alt text][1]
[1]: https://texnique.fr/osqa/upfiles/document.png
