-- title:  Lesson3
-- author: Bob Grant
-- desc:   Lesson 3
-- script: lua


x = 0
y = 0

function TIC()

	cls()
	
	-- update x coordinate
	-- 2 = left
	-- 3 = right
	if (btn(2)) then
		x = x - 1
	end
	if (btn(3)) then
		x = x + 1
	end
	
	-- update y coordinate
	-- 0 = up
	-- 1 = down
	
	if (btn(0)) then
		y = y - 1
	end
	if (btn(1)) then
		y = y + 1
	end
	
	if (x > 232) then
		x = 232
	end
	
	if (x < 0) then
		x = 0
	end
	
	if (y > 128) then
		y = 128
	end
	
	if (y < 0) then
		y = 0
	end
	
	print(x.." - "..y, x, y)
	
end