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%Constantes
u:=1cm;
v:=(sqrt3)/2;
pi:=3.141592654;
e:=2.718281828;
c:=57.29578; % conversion d'un radian en degres
color rouge,vert,bleu,jaune,noir,blanc,orange,rose,violet,ciel,cielfonce,orangevif,gris;
rouge=(1,0,0);
bleu=(0,0,1);
noir=(0,0,0);
blanc=(1,1,1);
orange=(1,0.5,0);
violet=blanc-vert;
rose=(1,0.7,0.7);
cielfonce=0.9*(0.25,1,1);
ciel=bleu+vert;
orangevif=(1,0.25,0.1);
vert=(0,1,0);
jaune=rouge+vert;
gris=0.8*white;

%coloriage et lumière
vardef Hsv(expr CC)=%CC couleur donnée en hsv d'après http://en.wikipedia.org/wiki/HSL_color_space
  save $;
  color $;
  SSw:=floor(redpart(CC)/60);
  SSh:=SSw mod 6;
  SSf:=(redpart(CC)/60)-floor(SSw);
  SSs:=greenpart((CC));
  SSv:=bluepart((CC));
  SSp:=SSv*(1-SSs);
  SSq:=SSv*(1-SSf*SSs);
  SSt:=SSv*(1-(1-SSf)*SSs);
  if SSh=0: $=(SSv,SSt,SSp) elseif SSh=1:$=(SSq,SSv,SSp) elseif SSh=2:$=(SSp,SSv,SSt) elseif SSh=3:$=(SSp,SSq,SSv) elseif SSh=4:$=(SSt,SSp,SSv) elseif SSh=5:$=(SSv,SSp,SSq) fi;
  $
enddef;