25 setxunit
7.5 setborder
90 setangle_repere
-0.8 2.8 setxrange
-0.8 1.8 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
traceaxes
unites
/f {setxvar
#rpn#   x
} def
/g {setxvar
#rpn#   -x+2
} def
gsave
   bleu
   .75 setlinewidth
   continu
 0 1  {f} Courbe
grestore
gsave
   bleu
   .75 setlinewidth
   continu
 1 2  {g} Courbe
grestore

noir
setTimesItalic

#latex#${\overrightarrow{i}}$
0.5 0  dctexlabel
#latex#${\overrightarrow{j}}$
0 0.5  cltexlabel
#latex#${\mathcal{C}_f}$
1.5 1  crtexlabel

(O) 0 0 dltext