Siemens star in MATLAB

Code:

clc

clear all

close all

k=input('Enter the no. of tracks you want to make:');

t=0:2*pi/(k*2):2*pi;

fill([-1 -1 1 1],[-1 1 1 -1],'k');

axis square;

hold on;

pause(10);

x=cos(t);

y=sin(t);

temp=0;

gemp=1;

hemp=1;

for i=1:length(t)-1

    if(rem(temp,2)==0)

        patch([x(gemp) 0 x(gemp+1) x(gemp)],[y(hemp) 0 y(hemp+1) y(hemp)],'w');

    else

        patch([x(gemp) 0 x(gemp+1) x(gemp)],[y(hemp) 0 y(hemp+1) y(hemp)],'k');

    end

    hold on;

    pause(0.5);

    gemp=gemp+1;

    hemp=hemp+1;

    temp=temp+1;

    axis([-1 1 -1 1]);

    axis square;

end