mirror of
https://gitlab.icynet.eu/evert/melterns.git
synced 2024-08-19 20:44:06 +02:00
65 lines
1.7 KiB
Lua
65 lines
1.7 KiB
Lua
multifurnace.api = {}
|
|
|
|
local function is_inner (pos)
|
|
local node = minetest.get_node_or_nil(pos)
|
|
return node and node.name == "air"
|
|
end
|
|
|
|
function multifurnace.api.detect_center (inside, limit)
|
|
-- "inside" is the position behind the controller, "inside the furnace"
|
|
|
|
-- adjust the x-position until the difference between the outer walls is at most 1
|
|
-- basically this means we center the position inside the furnace on the x axis.
|
|
local xd1 = 1 -- x-difference
|
|
local xd2 = 1
|
|
|
|
local zd1 = 1 -- z-difference
|
|
local zd2 = 1
|
|
|
|
for i = 1, limit do -- don't check farther than needed
|
|
-- expand the range on the x axis as long as one side has not met a wall
|
|
if is_inner(vector.add(inside, {x = -xd1, y = 0, z = 0})) then
|
|
xd1 = xd1 + 1
|
|
elseif is_inner(vector.add(inside, {x = xd2, y = 0, z = 0})) then
|
|
xd2 = xd2 + 1
|
|
end
|
|
|
|
-- if one side hit a wall and the other didn't we might have to re-center our x-position again
|
|
if xd1 - xd2 > 1 then
|
|
-- move x and offsets to the -x
|
|
xd1 = xd1 - 1
|
|
inside = vector.add(inside, {x = -1, y = 0, z = 0})
|
|
xd2 = xd2 + 1
|
|
end
|
|
-- or the right
|
|
if xd2 - xd1 > 1 then
|
|
xd2 = xd2 - 1
|
|
inside = vector.add(inside, {x = 1, y = 0, z = 0})
|
|
xd1 = xd1 + 1
|
|
end
|
|
|
|
-- also do exactly the same on the z axis
|
|
if is_inner(vector.add(inside, {x = 0, y = 0, z = -zd1})) then
|
|
zd1 = zd1 + 1
|
|
elseif is_inner(vector.add(inside, {x = 0, y = 0, z = zd2})) then
|
|
zd2 = zd2 + 1
|
|
end
|
|
|
|
if zd1 - zd2 > 1 then
|
|
-- move x and offsets to the -x
|
|
zd1 = zd1 - 1
|
|
inside = vector.add(inside, {x = 0, y = 0, z = -1})
|
|
zd2 = zd2 + 1
|
|
end
|
|
|
|
-- or the right
|
|
if zd2 - zd1 > 1 then
|
|
zd2 = zd2 - 1
|
|
inside = vector.add(inside, {x = 0, y = 0, z = 1})
|
|
zd1 = zd1 + 1
|
|
end
|
|
end
|
|
|
|
return inside
|
|
end
|