minetest_game/mods/carts/cart_entity.lua

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-- carts/cart_entity.lua
-- support for MT game translation.
local S = carts.get_translator
local cart_entity = {
initial_properties = {
physical = false, -- otherwise going uphill breaks
collisionbox = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
visual = "mesh",
mesh = "carts_cart.b3d",
visual_size = {x=1, y=1},
textures = {"carts_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,
railtype = nil,
attached_items = {}
}
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
carts:manage_attachment(clicker, nil)
elseif not self.driver then
carts: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})
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
end
function cart_entity:get_staticdata()
return minetest.serialize({
railtype = self.railtype,
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old_dir = self.old_dir
})
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
-- Clean up eye height
carts: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
-- Punched by non-player
if not puncher or not puncher:is_player() then
local cart_dir = carts: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, 2)
self.punched = true
return
end
-- Player digs cart by sneak-punch
if puncher:get_player_control().sneak then
if self.sound_handle then
minetest.sound_stop(self.sound_handle)
end
-- Detach driver and items
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)
carts:manage_attachment(player, nil)
end
for _, obj_ in ipairs(self.attached_items) do
if obj_ then
obj_:set_detach()
end
end
-- Pick up cart
local inv = puncher:get_inventory()
if not minetest.is_creative_enabled(puncher:get_player_name())
or not inv:contains_item("main", "carts:cart") then
local leftover = inv:add_item("main", "carts:cart")
-- If no room in inventory add a replacement cart to the world
if not leftover:is_empty() then
minetest.add_item(self.object:get_pos(), leftover)
end
end
self.object:remove()
return
end
-- Player punches cart to alter velocity
if puncher:get_player_name() == self.driver then
if math.abs(vel.x + vel.z) > carts.punch_speed_max then
return
end
end
local punch_dir = carts:velocity_to_dir(puncher:get_look_dir())
punch_dir.y = 0
local cart_dir = carts: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 = 2 * (time_from_last_punch / punch_interval)
self.velocity = vector.multiply(cart_dir, f)
self.old_dir = cart_dir
self.punched = true
end
local function rail_on_step_event(handler, obj, dtime)
if handler then
handler(obj, dtime)
end
end
-- sound refresh interval = 1.0sec
local function rail_sound(self, dtime)
if not self.sound_ttl then
self.sound_ttl = 1.0
return
elseif self.sound_ttl > 0 then
self.sound_ttl = self.sound_ttl - dtime
return
end
self.sound_ttl = 1.0
if self.sound_handle then
local handle = self.sound_handle
self.sound_handle = nil
minetest.after(0.2, minetest.sound_stop, handle)
end
local vel = self.object:get_velocity()
local speed = vector.length(vel)
if speed > 0 then
self.sound_handle = minetest.sound_play(
"carts_cart_moving", {
object = self.object,
gain = (speed / carts.speed_max) / 2,
loop = true,
})
end
end
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local function get_railparams(pos)
local node = minetest.get_node(pos)
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return carts.railparams[node.name] or {}
end
local v3_len = vector.length
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local function rail_on_step(self, 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 = carts:velocity_to_dir(vel)
local dir_changed = not vector.equals(dir, self.old_dir)
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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
-- 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
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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()
local distance = dtime * (v3_len(vel) + 0.5 * dtime * v3_len(acc))
local new_pos, new_dir = carts: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
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-- Stop wiggle
stop_wiggle = true
end
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local railparams
-- 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 = carts:get_rail_direction(
pos, dir, ctrl, self.old_switch, self.railtype
)
dir_changed = not vector.equals(dir, self.old_dir)
local acc = 0
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if stop_wiggle or vector.equals(dir, {x=0, y=0, z=0}) then
dir = vector.new(self.old_dir)
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vel = {x = 0, y = 0, z = 0}
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local pos_r = vector.round(pos)
if not carts:is_rail(pos_r, self.railtype)
and self.old_pos then
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pos = self.old_pos
elseif not stop_wiggle then
-- End of rail: Smooth out.
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pos = pos_r
dir_changed = false
dir.y = 0
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else
pos.y = math.floor(pos.y + 0.5)
end
update.pos = true
update.vel = true
else
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-- Direction change detected
if dir_changed then
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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
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-- 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
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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
-- Slow down or speed up..
acc = dir.y * -4.0
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-- Get rail for corrected position
railparams = get_railparams(pos)
-- no need to check for railparams == nil since we always make it exist.
local speed_mod = railparams.acceleration
if speed_mod and speed_mod ~= 0 then
-- Try to make it similar to the original carts mod
acc = acc + speed_mod
else
-- Handbrake or coast
if ctrl and ctrl.down then
acc = acc - 3
else
acc = acc - 0.4
end
end
end
-- Limit cart speed
local vel_len = vector.length(vel)
if vel_len > carts.speed_max then
vel = vector.multiply(vel, carts.speed_max / vel_len)
update.vel = true
end
if vel_len >= carts.speed_max and acc > 0 then
acc = 0
end
self.object:set_acceleration(vector.multiply(dir, acc))
self.old_pos = vector.round(pos)
self.old_dir = vector.new(dir)
self.old_switch = switch_keys
if self.punched then
-- Collect dropped items
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for _, obj_ in pairs(minetest.get_objects_inside_radius(pos, 1)) do
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local ent = obj_:get_luaentity()
-- Careful here: physical_state and disable_physics are item-internal APIs
if ent and ent.name == "__builtin:item" and ent.physical_state then
ent:disable_physics()
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
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railparams = railparams or get_railparams(pos)
if not (update.vel or update.pos) then
rail_on_step_event(railparams.on_step, self, dtime)
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
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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)
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
-- call event handler
rail_on_step_event(railparams.on_step, self, dtime)
end
function cart_entity:on_step(dtime)
rail_on_step(self, dtime)
rail_sound(self, dtime)
end
minetest.register_entity("carts:cart", cart_entity)
minetest.register_craftitem("carts:cart", {
description = S("Cart") .. "\n" .. S("(Sneak+Click to pick up)"),
inventory_image = minetest.inventorycube("carts_cart_top.png", "carts_cart_front.png", "carts_cart_side.png"),
wield_image = "carts_cart_front.png",
on_place = function(itemstack, placer, pointed_thing)
local under = pointed_thing.under
local node = minetest.get_node(under)
local udef = minetest.registered_nodes[node.name]
if udef and udef.on_rightclick and
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not (placer and placer:is_player() and
placer:get_player_control().sneak) then
return udef.on_rightclick(under, node, placer, itemstack,
pointed_thing) or itemstack
end
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if pointed_thing.type ~= "node" then
return
end
if carts:is_rail(pointed_thing.under) then
minetest.add_entity(pointed_thing.under, "carts:cart")
elseif carts:is_rail(pointed_thing.above) then
minetest.add_entity(pointed_thing.above, "carts:cart")
else
return
end
minetest.sound_play({name = "default_place_node_metal", gain = 0.5},
{pos = pointed_thing.above}, true)
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local player_name = placer and placer:get_player_name() or ""
if not minetest.is_creative_enabled(player_name) 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"},
},
})