draws some simple figure(sqaure,traingle).i obtained the inverse

kinematic and simulated the mechanasim in mathlab.I could draw cicrle

my question is how i can modify my program to draw a suqaure or

trianlge or even letters?

this is the mathlab code:

clear all

close all

clc

clear

t=0:0.1:2*pi;

r=1; //raduis of the cicle

n=length(t);

l1=1;

l2=1;

for i=1:n;

x(i)=r

***cos(t(i));**

y(i)=r*sin(t(i));

y(i)=r*

c2=(x(i)^2+y(i)^2-l1^2-l2^2)/(2

***l1***l2);

s2=sqrt(1-c2^2);

th2(i)=atan2(s2,c2)

k1=l1+l2

***c2;**

k2=l2*s2;

k2=l2*

th1(i)=atan2(y(i),x(i))-atan2(k1,k2)

x1=l1

***cos(th1(i));**

y1=l1*sin(th1(i));

y1=l1*

x2=x1+l2

***cos(th1(i)+th2(i));**

y2=y1+l2*sin(th1(i)+th2(i));

y2=y1+l2*

line([0,x1,x2],[0,y1,y2]);hold on;pause(0.5);

end;