map1={wallslength=4,wallsx={30,30,50,50},wallsy={30,50,50,30}}
map2={}
map3={}
s=0
sf=1

function _update()
 cls()
	s=1
	sf=2
	repeat
		if sf > map1.wallslength then
		line(map1.wallsx[s],map1.wallsy[s],map1.wallsx[1],map1.wallsy[1])
		else
	 line(map1.wallsx[s],map1.wallsy[s],map1.wallsx[s+1],map1.wallsy[s+1])
	 end
	 s+=1
	 sf+=1
	until s==map1.wallslength
end