u=1cm; beginfig(1); r=3; path p[], is; % grau markierter Kreisring p[1] := (0.5r*u,0)..(0,0.5r*u)..(-0.5r*u,0)..(0,-0.5r*u)..cycle; p[2] := (0.6r*u,0)..(0,0.6r*u)..(-0.6r*u,0)..(0,-0.6r*u)..cycle; fill p2 withcolor 0.5white; unfill p1; % dunkelgrauer Kreissektor von 110 bis 160 Grad p3 := (0,0)--(r*u,0) rotated 110; p4 := (0,0)--(r*u,0) rotated 160; is := buildcycle(p1,p3,p2,p4); fill is withcolor 0.3white; % äußere und innere Ringe draw (r*u,0)..(0,r*u)..(-r*u,0)..(0,-r*u)..cycle; draw (0.1r*u,0)..(0,0.1r*u)..(-0.1r*u,0).. (0,-0.1r*u)..cycle; draw p1; draw p2; % Beschriftung z1=(0.9r*u,0.8r*u); z2=(-0.7r*u,0.8r*u); drawarrow z1{left}--(0.6*r*u,0) rotated 45; drawarrow z2--(0.6*r*u,0) rotated 130; label.urt("Spur",z1); label.ulft("Sektor",z2); endfig; end;