t = (1:2:15)'*pi/8;
x = sin(t);
y = cos(t);
fill(x,y,'r') % a filled red circle using only 8 data points
axis square off
text(0,0,'STOP', ...
   'Color',[1 1 1], ...
   'FontSize',80, ...
   'FontWeight','bold', ...
   'HorizontalAlignment','center')
title('Figure 25.12: Stop Sign')