A = [0 2.5; 0.5 14; 0.6 14.5; 1.2 15; 4 15.8; 5.5 16; 7.3 16.3; 7 14; 4.5 11.6; 15 12]';
B = [4 15.8; 7.6 5.5; 7 5; 11 2]';
C = [7.3 16.3; 9 8; 12 4; 16 2.5]';
D = [9 8; 8.5 6.8; 7.6 5.5]';
E = [5.5 16; 5.4 18.5]';
F = [11 0; 13 0.5; 14 1]';
G = [16 0.8; 18 1; 18.8 1.8]';

plot(A(1,:),A(2,:),'k-o'); hold on; plot(B(1,:),B(2,:),'k-o'); plot(C(1,:),C(2,:),'k-o'); plot(D(1,:),D(2,:),'k-o'); plot(E(1,:),E(2,:),'k-o'); plot(F(1,:),F(2,:),'k-o'); plot(G(1,:),G(2,:),'k-o');

T = [0.5 0; 0 0.5];

A = T*A; B = T*B; C = T*C; D = T*D; E = T*E; F=T*F; G = T*G;

plot(A(1,:),A(2,:),'r-o'); hold on; plot(B(1,:),B(2,:),'r-o'); plot(C(1,:),C(2,:),'r-o'); plot(D(1,:),D(2,:),'r-o'); plot(E(1,:),E(2,:),'r-o'); plot(F(1,:),F(2,:),'r-o'); plot(G(1,:),G(2,:),'r-o');

T = [ 1 .1; 0 1];