--TurtleNav v0.1
x = 0 --l&r		z
z = 0 --f&b		|
y = 0 --u&d		y--x
direction = 1 



function orient(dir)
	dif = direction-dir
	if (dif == -1) or (dif == 3) then
		turtle.turnRight()
	elseif (dif == -2) or (dif == 2) then
		turtle.turnRight()
		turtle.turnRight()
	elseif (dif == -3) or (dif == 1) then
		turtle.turnLeft()
	end
	direction = dir
	
	if debug == true then
		print("Difference = "..dif)
	end
end

function forward()
	repeat 
	until turtle.forward() == true
	if direction == 1 then
		z = z+1
	elseif direction == 2 then
		x = x+1
	elseif direction == 3 then
		z = z-1
	elseif direction == 4 then
		x = x-1
	end
end

function back()
	repeat 
	until turtle.back() == true
	if direction == 1 then
		z = z-1
	elseif direction == 2 then
		x = x-1
	elseif direction == 3 then
		z = z+1
	elseif direction == 4 then
		x = x+1
	end
end

function up()
	repeat 
	until turtle.up() == true
	y = y+1
end

function down()
	repeat 
	until turtle.down() == true
	y = y-1
end

function travel(dX,dZ,dY)
	if dX > x then
		orient(2)
	elseif dX < x then
		orient(4)
	end
	for i = 0,math.abs(dX-x),1 do
		forward()
	end
	
	if dZ > z then
		orient(1)
	elseif dZ < z then
		orient(3)
	end
	for i = 0,math.abs(dZ-z),1 do
		forward()
	end
	
	if dY > y then
		for i = 0,math.abs(dY-y),1 do
			up()
		end
	elseif dY < y then
		for i = 0,math.abs(dY-y),1 do
			down()
		end
	end
end