// Une fonction méconnue : windingnumber
// Premier exemple pour la comprendre.

size(8cm,0);
path chemin=(0,0){dir(45)}..(1,0)..(1,.5)..(0,1)..(-.5,.8)..cycle;
dot(chemin,5bp+.5green);
draw(chemin,Arrow());

pair z;
for(int k=0; k<50; ++k){
      z=(-.75+2*unitrand(),-.75+2*unitrand());
      dot(string(windingnumber(chemin,z)),z,.1E,1bp+red);
}
z=point(chemin,4.3);
dot(string(windingnumber(chemin,z)),z,.3E,5bp+blue);

label("windingnumber(path, pair)",truepoint(N),N);
label("undefined = "+string(undefined),truepoint(S),S);