tmin=0
tmax=100
pas=0.1
#pas=0.001
#.......................................
nb=(tmax-tmin)/pas
#.......................................
def T(x,y,couleur) :
     return(point((x,y),rgbcolor=couleur,pointsize=1))
#.......................................
g=Graphics()
for t in srange(tmin,tmax+1,2):
    g+=line([(t,-0.2),(t,0.2)],rgbcolor=(0.205,0.201,0.201),alpha=0.65,thickness=0.05)
for t in srange(tmin,tmax+1,10):
    g+=line([(t,-1),(t,1)],rgbcolor=(0.205,0.201,0.201),alpha=0.65,thickness=0.1)
    g+=text(str(t),(t,-3),color='black')
for t in srange(tmin,tmax,pas):
    g+=T(t,0,hue(tmin+t*(1-tmin)/tmax))	
nom='Echelle_couleur.pdf'
g.save(nom,axes=false,aspect_ratio=1)