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 transform pagecoords; pagecoords:=identity scaled 10mm shifted (100mm,150mm); beginfig (1)     fill ((0,0)--(2,0)--(2,1)--(1,1)--(1,2)--(0,2)--cycle)         transformed pagecoords withcolor green;     draw ((2,0)..(2,1)..(1,1)..(1,2)..(0,2))         transformed pagecoords;     drawarrow ((0,0)--(2,2)) transformed pagecoords; endfig; beginfig (2)     draw (for i=0 up to 7: dir (135i)-- endfor cycle)         transformed pagecoords; endfig; pagecoords:=identity scaled 15mm shifted (100mm,150mm); beginfig (3);     % declare paths to be used     path p[],p[]t;     % set up points by defining relationships     z1=(0,0);   z2=z1+2up;     z3=z1+whatever*dir (60)=z2+whatever*dir (-50);     z4=z3+(-1.5,-.5);     z5=z1+dir (135);     z0=whatever[z1,z2]=whatever[z3,z4];     % set up paths     p0=fullcircle yscaled .5 rotated 45 shifted z0 ;     p1=z2—z4..z0..z3---z1;     p2=p1 cutbefore p0 cutafter p0;     p3=p0 cutbefore p1 cutafter p1;     p4=p2—p3—cycle;     % define transformed versions of paths and points     for i=0 up to 4: p[i]t=p[i] transformed pagecoords; endfor     for i=0 up to 5: z[i]t=z[i] transformed pagecoords; endfor     % do some drawing     fill p4t withcolor (1,1,0.2);     draw z1t—z2t withcolor .5white;     draw z3t—z4t withcolor .5white;     pickup pencircle;     draw p0t dashed withdots scaled .3;     draw p1t dashed evenly;     draw p2t withcolor blue;     draw p3t withcolor red;     label.lrt (btex $z_0$ etex, z0t);     label.llft (btex $z_1$ etex, z1t);     label.top (btex $z_2$ etex, z2t);     label.rt (btex $z_3$ etex, z3t);     label.llft (btex $z_4$ etex, z4t);     for i=0 up to 4:         drawdot z[i]t withpen pencircle scaled 2;     endfor endfig; bye