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function boost_cart:get_sign(z)
if z == 0 then
return 0
else
return z / math.abs(z)
end
end
function boost_cart:manage_attachment(player, obj)
if not player then
return
end
local status = obj ~= nil
local player_name = player:get_player_name()
if default.player_attached[player_name] == status then
return
end
default.player_attached[player_name] = status
if status then
player:set_attach(obj, "", {x=0, y=6, z=0}, {x=0, y=0, z=0})
player:set_eye_offset({x=0, y=-4, z=0},{x=0, y=-4, z=0})
else
player:set_detach()
player:set_eye_offset({x=0, y=0, z=0},{x=0, y=0, z=0})
end
end
function boost_cart:velocity_to_dir(v)
if math.abs(v.x) > math.abs(v.z) then
return {x=boost_cart:get_sign(v.x), y=boost_cart:get_sign(v.y), z=0}
else
return {x=0, y=boost_cart:get_sign(v.y), z=boost_cart:get_sign(v.z)}
end
end
function boost_cart:is_rail(pos, railtype)
local node = minetest.get_node(pos).name
if node == "ignore" then
local vm = minetest.get_voxel_manip()
local emin, emax = vm:read_from_map(pos, pos)
local area = VoxelArea:new{
MinEdge = emin,
MaxEdge = emax,
}
local data = vm:get_data()
local vi = area:indexp(pos)
node = minetest.get_name_from_content_id(data[vi])
end
if minetest.get_item_group(node, "rail") == 0 then
return false
end
if not railtype then
return true
end
return minetest.get_item_group(node, "connect_to_raillike") == railtype
end
function boost_cart:check_front_up_down(pos, dir_, check_up, railtype)
local dir = vector.new(dir_)
local cur = nil
-- Front
dir.y = 0
cur = vector.add(pos, dir)
if boost_cart:is_rail(cur, railtype) then
return dir
end
-- Up
if check_up then
dir.y = 1
cur = vector.add(pos, dir)
if boost_cart:is_rail(cur, railtype) then
return dir
end
end
-- Down
dir.y = -1
cur = vector.add(pos, dir)
if boost_cart:is_rail(cur, railtype) then
return dir
end
return nil
end
function boost_cart:get_rail_direction(pos_, dir, ctrl, old_switch, railtype)
local pos = vector.round(pos_)
local cur = nil
local left_check, right_check = true, true
-- Check left and right
local left = {x=0, y=0, z=0}
local right = {x=0, y=0, z=0}
if dir.z ~= 0 and dir.x == 0 then
left.x = -dir.z
right.x = dir.z
elseif dir.x ~= 0 and dir.z == 0 then
left.z = dir.x
right.z = -dir.x
end
if ctrl then
if old_switch == 1 then
left_check = false
elseif old_switch == 2 then
right_check = false
end
if ctrl.left and left_check then
cur = boost_cart:check_front_up_down(pos, left, false, railtype)
if cur then
return cur, 1
end
left_check = false
end
if ctrl.right and right_check then
cur = boost_cart:check_front_up_down(pos, right, false, railtype)
if cur then
return cur, 2
end
right_check = true
end
end
-- Normal
cur = boost_cart:check_front_up_down(pos, dir, true, railtype)
if cur then
return cur
end
-- Left, if not already checked
if left_check then
cur = boost_cart:check_front_up_down(pos, left, false, railtype)
if cur then
return cur
end
end
-- Right, if not already checked
if right_check then
cur = boost_cart:check_front_up_down(pos, right, false, railtype)
if cur then
return cur
end
end
-- Backwards
if not old_switch then
cur = boost_cart:check_front_up_down(pos, {
x = -dir.x,
y = dir.y,
z = -dir.z
}, true, railtype)
if cur then
return cur
end
end
return {x=0, y=0, z=0}
end
function boost_cart:pathfinder(pos_, old_pos, old_dir, ctrl, pf_switch, railtype)
local pos = vector.round(pos_)
local pf_pos = vector.round(old_pos)
local pf_dir = vector.new(old_dir)
for i = 1, 3 do
if vector.equals(pf_pos, pos) then
-- Success! Cart moved on correctly
return true
end
pf_dir, pf_switch = boost_cart:get_rail_direction(pf_pos, pf_dir, ctrl, pf_switch, railtype)
if vector.equals(pf_dir, {x=0, y=0, z=0}) then
-- No way forwards
return false
end
pf_pos = vector.add(pf_pos, pf_dir)
end
-- Cart not found
return false
end
function boost_cart:boost_rail(pos, amount)
minetest.get_meta(pos):set_string("cart_acceleration", tostring(amount))
for _,obj_ in ipairs(minetest.get_objects_inside_radius(pos, 0.5)) do
if not obj_:is_player() and
obj_:get_luaentity() and
obj_:get_luaentity().name == "carts:cart" then
obj_:get_luaentity():on_punch()
end
end
end
function boost_cart:register_rail(name, def)
local def_default = {
drawtype = "raillike",
paramtype = "light",
sunlight_propagates = true,
is_ground_content = false,
walkable = false,
selection_box = {
type = "fixed",
fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
}
}
for k, v in pairs(def_default) do
def[k] = v
end
if not def.inventory_image then
def.wield_image = def.tiles[1]
def.inventory_image = def.tiles[1]
end
minetest.register_node(name, def)
end
function boost_cart:get_rail_groups(additional_groups)
-- Get the default rail groups and add more when a table is given
local groups = {dig_immediate = 2, attached_node = 1, rail = 1, connect_to_raillike = 1}
if type(additional_groups) == "table" then
for k, v in pairs(additional_groups) do
groups[k] = v
end
end
return groups
end
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