Traffic Lights

By Gayatri
r = rectangle(x=0,y=0,w=300,h=300,fill="#FFFFFF",stroke="none")
r1 = rectangle(x=0, y=30, w=100, h=250, fill="black", stroke="none")
r2 = rectangle(x=0, y=-100, w=20, h=100, fill="black", stroke="none")
c1 = circle(y=100, fill="red",r=25)
c2 = circle(y=25, fill="yellow",r=25)
c3 = circle(y=-50, fill="green",r=25)
show(r,r1,r2,c1,c2,c3)