Carts for Minetest, but optimized! Also compatible with MTG carts https://content.minetest.net/packages/Krock/boost_cart/
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function boost_cart:on_rail_step(entity, pos, distance)
-- Play rail sound
if entity.sound_counter <= 0 then
minetest.sound_play("cart_rail", {
pos = pos,
max_hear_distance = 40,
gain = 0.5
})
entity.sound_counter = math.random(4, 15)
end
entity.sound_counter = entity.sound_counter - distance
if boost_cart.MESECONS then
boost_cart:signal_detector_rail(pos)
end
end
local cart_entity = {
initial_properties = {
physical = false,
collisionbox = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
visual = "mesh",
mesh = "cart.x",
visual_size = {x=1, y=1},
textures = {"cart.png"},
},
driver = nil,
punched = false, -- used to re-send velocity and position
velocity = {x=0, y=0, z=0}, -- only used on punch
old_dir = {x=1, y=0, z=0}, -- random value to start the cart on punch
old_pos = nil,
old_switch = 0,
sound_counter = 0,
railtype = nil,
attached_items = {}
}
-- Model and textures
if boost_cart.MTG_CARTS then
cart_entity.initial_properties.mesh = "carts_cart.b3d"
cart_entity.initial_properties.textures = {"carts_cart.png"}
end
function cart_entity:on_rightclick(clicker)
if not clicker or not clicker:is_player() then
return
end
local player_name = clicker:get_player_name()
if self.driver and player_name == self.driver then
boost_cart:manage_attachment(clicker, nil)
elseif not self.driver then
boost_cart:manage_attachment(clicker, self.object)
self.driver = player_name
end
end
function cart_entity:on_activate(staticdata, dtime_s)
self.object:set_armor_groups({immortal=1})
self.sound_counter = math.random(4, 15)
if string.sub(staticdata, 1, string.len("return")) ~= "return" then
return
end
local data = minetest.deserialize(staticdata)
if type(data) ~= "table" then
return
end
self.railtype = data.railtype
self.old_dir = data.old_dir or self.old_dir
self.old_pos = data.old_pos or self.old_pos
-- Correct the position when the cart drives further after the last 'step()'
if self.old_pos and boost_cart:is_rail(self.old_pos, self.railtype) then
self.object:set_pos(self.old_pos)
end
end
function cart_entity:get_staticdata()
return minetest.serialize({
railtype = self.railtype,
old_dir = self.old_dir,
old_pos = self.old_pos
})
end
-- 0.5.x and later: When the driver leaves
function cart_entity:on_detach_child(child)
if child and child:get_player_name() == self.driver then
boost_cart:manage_attachment(child, nil)
self.driver = nil
end
end
function cart_entity:on_punch(puncher, time_from_last_punch, tool_capabilities, direction)
local pos = self.object:get_pos()
local vel = self.object:get_velocity()
if not self.railtype or vector.equals(vel, {x=0, y=0, z=0}) then
local node = minetest.get_node(pos).name
self.railtype = minetest.get_item_group(node, "connect_to_raillike")
end
if not puncher or not puncher:is_player() then
local cart_dir = boost_cart:get_rail_direction(pos, self.old_dir, nil, nil, self.railtype)
if vector.equals(cart_dir, {x=0, y=0, z=0}) then
return
end
self.velocity = vector.multiply(cart_dir, 3)
self.punched = true
return
end
if puncher:get_player_control().sneak then
-- Pick up cart: Drop all attachments
if self.driver then
if self.old_pos then
self.object:set_pos(self.old_pos)
end
local player = minetest.get_player_by_name(self.driver)
boost_cart:manage_attachment(player, nil)
end
for _, obj_ in pairs(self.attached_items) do
local ent = obj_ and obj_:get_luaentity()
if ent then
obj_:set_detach()
-- Attention! Internal item API
if ent.enable_physics then
ent:enable_physics()
end
end
end
local leftover = puncher:get_inventory():add_item("main", "carts:cart")
if not leftover:is_empty() then
minetest.add_item(pos, leftover)
end
self.object:remove()
return
end
-- Driver punches to accelerate the cart
if puncher:get_player_name() == self.driver then
if math.abs(vel.x + vel.z) > boost_cart.punch_speed_max then
return
end
end
local punch_dir = boost_cart:velocity_to_dir(puncher:get_look_dir())
punch_dir.y = 0
local cart_dir = boost_cart:get_rail_direction(pos, punch_dir, nil, nil, self.railtype)
if vector.equals(cart_dir, {x=0, y=0, z=0}) then
return
end
local punch_interval = 1
-- Faulty tool registrations may cause the interval to be set to 0 !
if tool_capabilities and (tool_capabilities.full_punch_interval or 0) > 0 then
punch_interval = tool_capabilities.full_punch_interval
end
time_from_last_punch = math.min(time_from_last_punch or punch_interval, punch_interval)
local f = 3 * (time_from_last_punch / punch_interval)
self.velocity = vector.multiply(cart_dir, f)
self.old_dir = cart_dir
self.punched = true
end
local v3_len = vector.length
function cart_entity:on_step(dtime)
local vel = self.object:get_velocity()
if self.punched then
vel = vector.add(vel, self.velocity)
self.object:set_velocity(vel)
self.old_dir.y = 0
elseif vector.equals(vel, {x=0, y=0, z=0}) then
return
end
local pos = self.object:get_pos()
local dir = boost_cart:velocity_to_dir(vel)
local dir_changed = not vector.equals(dir, self.old_dir)
local update = {}
if self.old_pos and not self.punched and not dir_changed then
local flo_pos = vector.round(pos)
local flo_old = vector.round(self.old_pos)
if vector.equals(flo_pos, flo_old) then
-- Do not check one node multiple times
return
end
end
local ctrl, player
local distance = 1
-- Get player controls
if self.driver then
player = minetest.get_player_by_name(self.driver)
if player then
ctrl = player:get_player_control()
end
end
local stop_wiggle = false
if self.old_pos and not dir_changed then
-- Detection for "skipping" nodes (perhaps use average dtime?)
-- It's sophisticated enough to take the acceleration in account
local acc = self.object:get_acceleration()
distance = dtime * (v3_len(vel) + 0.5 * dtime * v3_len(acc))
local new_pos, new_dir = boost_cart:pathfinder(
pos, self.old_pos, self.old_dir, distance, ctrl,
self.old_switch, self.railtype
)
if new_pos then
-- No rail found: set to the expected position
pos = new_pos
update.pos = true
dir = new_dir
end
elseif self.old_pos and self.old_dir.y ~= 1 and not self.punched then
-- Stop wiggle
stop_wiggle = true
end
-- dir: New moving direction of the cart
-- switch_keys: Currently pressed L(1) or R(2) key,
-- used to ignore the key on the next rail node
local switch_keys
dir, switch_keys = boost_cart:get_rail_direction(
pos, dir, ctrl, self.old_switch, self.railtype
)
dir_changed = not vector.equals(dir, self.old_dir)
local acc = 0
if stop_wiggle or vector.equals(dir, {x=0, y=0, z=0}) then
dir = vector.new(self.old_dir)
vel = {x=0, y=0, z=0}
local pos_r = vector.round(pos)
if not boost_cart:is_rail(pos_r, self.railtype)
and self.old_pos then
pos = self.old_pos
elseif not stop_wiggle then
-- End of rail: Smooth out.
pos = pos_r
dir_changed = false
dir.y = 0
else
pos.y = math.floor(pos.y + 0.5)
end
update.pos = true
update.vel = true
else
-- Direction change detected
if dir_changed then
vel = vector.multiply(dir, math.abs(vel.x + vel.z))
update.vel = true
if dir.y ~= self.old_dir.y then
pos = vector.round(pos)
update.pos = true
end
end
-- Center on the rail
if dir.z ~= 0 and math.floor(pos.x + 0.5) ~= pos.x then
pos.x = math.floor(pos.x + 0.5)
update.pos = true
end
if dir.x ~= 0 and math.floor(pos.z + 0.5) ~= pos.z then
pos.z = math.floor(pos.z + 0.5)
update.pos = true
end
-- Calculate current cart acceleration
acc = nil
local acc_meta = minetest.get_meta(pos):get_string("cart_acceleration")
if acc_meta == "halt" and not self.punched then
-- Stop rail
vel = {x=0, y=0, z=0}
acc = false
pos = vector.round(pos)
update.pos = true
update.vel = true
end
if acc == nil then
-- Meta speed modifier
local speed_mod = tonumber(acc_meta)
if speed_mod and speed_mod ~= 0 then
-- Try to make it similar to the original carts mod
acc = speed_mod * 10
end
end
if acc == nil and boost_cart.MTG_CARTS then
-- MTG Cart API adaption
local rail_node = minetest.get_node(vector.round(pos))
local railparam = carts.railparams[rail_node.name]
if railparam and railparam.acceleration then
acc = railparam.acceleration
end
end
if acc ~= false then
-- Handbrake
if ctrl and ctrl.down then
acc = (acc or 0) - 2
elseif acc == nil then
acc = -0.4
end
end
if ctrl and ctrl.sneak then
-- Descend when sneak is pressed
boost_cart:manage_attachment(player, nil)
player = nil
ctrl = nil
end
if acc then
-- Slow down or speed up, depending on Y direction
acc = acc + dir.y * -4
else
acc = 0
end
end
-- Limit cart speed
local vel_len = vector.length(vel)
if vel_len > boost_cart.speed_max then
vel = vector.multiply(vel, boost_cart.speed_max / vel_len)
update.vel = true
end
if vel_len >= boost_cart.speed_max and acc > 0 then
acc = 0
end
self.object:set_acceleration(vector.multiply(dir, acc))
self.old_pos = vector.round(pos)
local old_y_dir = self.old_dir.y -- For player tilt
self.old_dir = vector.new(dir)
self.old_switch = switch_keys
boost_cart:on_rail_step(self, self.old_pos, distance)
if self.punched then
-- Collect dropped items
for _, obj_ in pairs(minetest.get_objects_inside_radius(pos, 1)) do
local ent = obj_:get_luaentity()
-- Attention! Physics must be disabled prior to attach
if ent and ent.name == "__builtin:item" and not obj_:get_attach() then
-- Check API to support 5.2.0 and older
if ent.disable_physics then
ent:disable_physics()
end
obj_:set_attach(self.object, "", {x=0, y=0, z=0}, {x=0, y=0, z=0})
self.attached_items[#self.attached_items + 1] = obj_
end
end
self.punched = false
update.vel = true
end
if not (update.vel or update.pos) then
return
end
local yaw = 0
if dir.x < 0 then
yaw = 0.5
elseif dir.x > 0 then
yaw = 1.5
elseif dir.z < 0 then
yaw = 1
end
self.object:set_yaw(yaw * math.pi)
local anim = {x=0, y=0}
if dir.y == -1 then
anim = {x=1, y=1}
elseif dir.y == 1 then
anim = {x=2, y=2}
end
self.object:set_animation(anim, 1, 0)
-- Change player model rotation, depending on the Y direction
if player and dir.y ~= old_y_dir then
local feet = {x=0, y=-4, z=0}
local eye = {x=0, y=-4, z=0}
if dir.y ~= 0 then
-- TODO: Find a better way to calculate this
feet.y = feet.y + 4
feet.z = -dir.y * 2
eye.z = -dir.y * 8
end
player:set_attach(self.object, "", feet,
{x=dir.y * -30, y=0, z=0})
player:set_eye_offset(eye, eye)
end
if update.vel then
self.object:set_velocity(vel)
end
if update.pos then
if dir_changed then
self.object:set_pos(pos)
else
self.object:move_to(pos)
end
end
end
minetest.register_entity(":carts:cart", cart_entity)
-- Register item to place the entity
if not boost_cart.MTG_CARTS then
minetest.register_craftitem(":carts:cart", {
description = "Cart (Sneak+Click to pick up)",
inventory_image = minetest.inventorycube(
"cart_top.png",
"cart_side.png",
"cart_side.png"
),
wield_image = "cart_side.png",
on_place = function(itemstack, placer, pointed_thing)
if not pointed_thing.type == "node" then
return
end
if boost_cart:is_rail(pointed_thing.under) then
minetest.add_entity(pointed_thing.under, "carts:cart")
elseif boost_cart:is_rail(pointed_thing.above) then
minetest.add_entity(pointed_thing.above, "carts:cart")
else
return
end
if not minetest.settings:get_bool("creative_mode") then
itemstack:take_item()
end
return itemstack
end,
})
minetest.register_craft({
output = "carts:cart",
recipe = {
{"default:steel_ingot", "", "default:steel_ingot"},
{"default:steel_ingot", "default:steel_ingot", "default:steel_ingot"},
},
})
end