Echelle trigo
Voilà un exemple tout prêt :
\psset{xunit=1cm,yunit=1cm,algebraic=true,dimen=middle,
dotstyle=o,dotsize=5pt 0,linewidth=0.2pt,arrowsize=3pt 2,
arrowinset=0.25,trigLabels=true}
\begin{pspicture*}(-0.8,-0.5)(3.2,1.8)
\begin{scriptsize}
\multips(0,-0.5)(0,0.5){5}
{\psline[linestyle=dashed,linecap=1,dash=1.5pt 1.5pt,
linewidth=0.4pt,linecolor=lightgray]{c-c}(-0.5,0)(3.5,0)}
\multips(-0.5,0)(0.5,0){9}
{\psline[linestyle=dashed,linecap=1,dash=1.5pt 1.5pt,
linewidth=0.4pt,linecolor=lightgray]{c-c}(0,-0.5)(0,1.5)}
\psaxes[showorigin=false,xAxis=true,yAxis=true,Dx=1,Dy=1,dy=5,
ticksize=-2pt 0,subticks=2]
{->}(0,0)(-0.8,-0.4)(3.2,1.5)[$t$,120][$y$,-150]
\psline[linewidth=1pt,linecolor=blue](-1,1)(0,0)(1,1)(2,0)(3,1)(4,0)
\rput[bl](-0.2,1){$\pi$}
\rput[bl](-0.25,-0.25){O}
\end{scriptsize}
\end{pspicture*}
écrit par : Stéphane Le Méteil, le 27/10/2020