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-- orientation: east 1 x+, south 2 z+, west 3 x-, north 4 z-
local function turnTo(o1, o2)
if o1 == o2 then
return nil
end
if math.abs(o2 - o1) == 2 then
turtle.turnLeft()
turtle.turnLeft()
elseif o2 - o1 == 1 or o2 - o1 == -3 then
turtle.turnRight()
else
turtle.turnLeft()
end
end
local function moveX(x1, x2, o1)
if x1 == x2 then
return o1
end
local amount = x2 - x1
local o2 = amount > 0 and 1 or 3
turnTo(o1, o2)
for ii = 1, math.abs(amount) do
turtle.forward()
end
return o2
end
local function moveZ(z1, z2, o1)
if z1 == z2 then
return o1
end
local amount = z2 - z1
local o2 = amount > 0 and 2 or 4
turnTo(o1, o2)
for ii = 1, math.abs(amount) do
turtle.forward()
end
return o2
end
local function moveY(y1, y2)
if y1 == y2 then
return nil
end
local amount = y2 - y1
for ii = 1, math.abs(amount) do
if y2 > y1 then
turtle.up()
else
turtle.down()
end
end
end
local function travel(x1, y1, z1, o1, x2, y2, z2, o2, safe_y, unsafe)
unsafe = unsafe or false
local dx = x2 - x1
local dz = z2 - z1
local move_safe = (not unsafe) and (dx ~= 0 or dz ~= 0)
if move_safe then
moveY(y1, safe_y)
else
moveY(y1, y2)
end
local newO = moveX(x1, x2, o1)
newO = moveZ(z1, z2, newO)
if move_safe then
moveY(safe_y, y2)
end
turnTo(newO, o2)
end
return { turnTo = turnTo, moveX = moveX, moveZ = moveZ, moveY = moveY, travel = travel }
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