minetest-mm/mods/builtin_item/init.lua

471 lines
10 KiB
Lua
Raw Normal View History

2020-10-26 17:38:53 +01:00
-- Minetest: builtin/item_entity.lua
-- override ice to make slippery for 0.4.16
minetest.override_item("default:ice", {
groups = {cracky = 3, puts_out_fire = 1, cools_lava = 1, slippery = 3}})
function core.spawn_item(pos, item)
local stack = ItemStack(item)
local obj = core.add_entity(pos, "__builtin:item")
if obj then
obj:get_luaentity():set_item(stack:to_string())
end
return obj
end
-- If item_entity_ttl is not set, enity will have default life time
-- Setting it to -1 disables the feature
local time_to_live = tonumber(core.settings:get("item_entity_ttl")) or 900
local gravity = tonumber(core.settings:get("movement_gravity")) or 9.81
local destroy_item = core.settings:get_bool("destroy_item") ~= false
-- water flow functions by QwertyMine3, edited by TenPlus1
local function to_unit_vector(dir_vector)
local inv_roots = {
[0] = 1,
[1] = 1,
[2] = 0.70710678118655,
[4] = 0.5,
[5] = 0.44721359549996,
[8] = 0.35355339059327
}
local sum = dir_vector.x * dir_vector.x + dir_vector.z * dir_vector.z
return {
x = dir_vector.x * inv_roots[sum],
y = dir_vector.y,
z = dir_vector.z * inv_roots[sum]
}
end
local function node_ok(pos)
local node = minetest.get_node_or_nil(pos)
if node and minetest.registered_nodes[node.name] then
return node
end
return minetest.registered_nodes["default:dirt"]
end
local function quick_flow_logic(node, pos_testing, direction)
local node_testing = node_ok(pos_testing)
if minetest.registered_nodes[node_testing.name].liquidtype ~= "flowing"
and minetest.registered_nodes[node_testing.name].liquidtype ~= "source" then
return 0
end
local param2_testing = node_testing.param2
if param2_testing < node.param2 then
if (node.param2 - param2_testing) > 6 then
return -direction
else
return direction
end
elseif param2_testing > node.param2 then
if (param2_testing - node.param2) > 6 then
return direction
else
return -direction
end
end
return 0
end
local function quick_flow(pos, node)
if not minetest.registered_nodes[node.name].groups.liquid then
return {x = 0, y = 0, z = 0}
end
local x, z = 0, 0
x = x + quick_flow_logic(node, {x = pos.x - 1, y = pos.y, z = pos.z},-1)
x = x + quick_flow_logic(node, {x = pos.x + 1, y = pos.y, z = pos.z}, 1)
z = z + quick_flow_logic(node, {x = pos.x, y = pos.y, z = pos.z - 1},-1)
z = z + quick_flow_logic(node, {x = pos.x, y = pos.y, z = pos.z + 1}, 1)
return to_unit_vector({x = x, y = 0, z = z})
end
-- END water flow functions
-- particle effects for when item is destroyed
local function add_effects(pos)
minetest.add_particlespawner({
amount = 1,
time = 0.25,
minpos = pos,
maxpos = pos,
minvel = {x = -1, y = 2, z = -1},
maxvel = {x = 1, y = 4, z = 1},
minacc = {x = 0, y = 0, z = 0},
maxacc = {x = 0, y = 0, z = 0},
minexptime = 1,
maxexptime = 3,
minsize = 1,
maxsize = 4,
texture = "tnt_smoke.png",
})
end
core.register_entity(":__builtin:item", {
initial_properties = {
hp_max = 1,
physical = true,
collide_with_objects = false,
collisionbox = {-0.3, -0.3, -0.3, 0.3, 0.3, 0.3},
visual = "wielditem",
visual_size = {x = 0.4, y = 0.4},
textures = {""},
spritediv = {x = 1, y = 1},
initial_sprite_basepos = {x = 0, y = 0},
is_visible = false,
infotext = "",
},
itemstring = "",
moving_state = true,
slippery_state = false,
age = 0,
set_item = function(self, item)
local stack = ItemStack(item or self.itemstring)
self.itemstring = stack:to_string()
if self.itemstring == "" then
return
end
local itemname = stack:is_known() and stack:get_name() or "unknown"
local max_count = stack:get_stack_max()
local count = math.min(stack:get_count(), max_count)
local size = 0.2 + 0.1 * (count / max_count) ^ (1 / 3)
local col_height = size * 0.75
local def = core.registered_nodes[itemname]
local glow = def and def.light_source
local c1, c2 = "",""
if not(stack:get_count() == 1) then
c1 = " x"..tostring(stack:get_count())
c2 = " "..tostring(stack:get_count())
end
local name1 = stack:get_meta():get_string("description")
if name1 == "" then
name = core.registered_items[itemname].description
else
name = name1
end
self.object:set_properties({
is_visible = true,
visual = "wielditem",
textures = {itemname},
visual_size = {x = size, y = size},
collisionbox = {-size, -col_height, -size, size, col_height, size},
selectionbox = {-size, -size, -size, size, size, size},
automatic_rotate = 0.314 / size,
wield_item = self.itemstring,
glow = glow,
infotext = name..c1.."\n("..itemname..c2..")"
})
end,
get_staticdata = function(self)
return core.serialize({
itemstring = self.itemstring,
age = self.age,
dropped_by = self.dropped_by
})
end,
on_activate = function(self, staticdata, dtime_s)
if string.sub(staticdata, 1, string.len("return")) == "return" then
local data = core.deserialize(staticdata)
if data and type(data) == "table" then
self.itemstring = data.itemstring
self.age = (data.age or 0) + dtime_s
self.dropped_by = data.dropped_by
end
else
self.itemstring = staticdata
end
self.object:set_armor_groups({immortal = 1})
self.object:set_velocity({x = 0, y = 2, z = 0})
self.object:set_acceleration({x = 0, y = -gravity, z = 0})
self:set_item()
end,
try_merge_with = function(self, own_stack, object, entity)
if self.age == entity.age then
return false -- Can not merge with itself
end
local stack = ItemStack(entity.itemstring)
local name = stack:get_name()
if own_stack:get_name() ~= name
or own_stack:get_meta() ~= stack:get_meta()
or own_stack:get_wear() ~= stack:get_wear()
or own_stack:get_free_space() == 0 then
return false -- Can not merge different or full stack
end
local count = own_stack:get_count()
local total_count = stack:get_count() + count
local max_count = stack:get_stack_max()
if total_count > max_count then
return false
end
-- Merge the remote stack into this one
local pos = object:get_pos()
pos.y = pos.y + ((total_count - count) / max_count) * 0.15
self.object:move_to(pos)
self.age = 0 -- Handle as new entity
own_stack:set_count(total_count)
self:set_item(own_stack)
entity.itemstring = ""
object:remove()
return true
end,
on_step = function(self, dtime)
local pos = self.object:get_pos()
self.age = self.age + dtime
if time_to_live > 0 and self.age > time_to_live then
self.itemstring = ""
self.object:remove()
add_effects(pos)
return
end
-- get nodes every 1/4 second
self.timer = (self.timer or 0) + dtime
if self.timer > 0.25 or not self.node_inside then
self.node_inside = minetest.get_node_or_nil(pos)
self.def_inside = self.node_inside
and core.registered_nodes[self.node_inside.name]
self.node_under = minetest.get_node_or_nil({
x = pos.x,
y = pos.y + self.object:get_properties().collisionbox[2] - 0.05,
z = pos.z
})
self.def_under = self.node_under
and core.registered_nodes[self.node_under.name]
self.timer = 0
end
local node = self.node_inside
-- Delete in 'ignore' nodes
if node and node.name == "ignore" then
self.itemstring = ""
self.object:remove()
return
end
-- do custom step function
local name = ItemStack(self.itemstring):get_name() or ""
local custom = core.registered_items[name]
and core.registered_items[name].dropped_step
if custom and custom(self, pos, dtime) == false then
return -- skip further checks if false
end
local vel = self.object:get_velocity()
local def = self.def_inside
local is_slippery = false
local is_moving = (def and not def.walkable) or
vel.x ~= 0 or vel.y ~= 0 or vel.z ~= 0
-- destroy item when dropped into lava (if enabled)
if destroy_item and def and def.groups and def.groups.lava then
minetest.sound_play("builtin_item_lava", {
pos = pos,
max_hear_distance = 6,
gain = 0.5
})
self.itemstring = ""
self.object:remove()
add_effects(pos)
return
end
-- water flowing
if def and def.liquidtype == "flowing" then
local vec = quick_flow(pos, node)
local v = self.object:get_velocity()
self.object:set_velocity({x = vec.x, y = v.y, z = vec.z})
return
end
-- item inside block, move to vacant space
if def and (def.walkable == nil or def.walkable == true)
and (def.collision_box == nil or def.collision_box.type == "regular")
and (def.node_box == nil or def.node_box.type == "regular") then
local npos = minetest.find_node_near(pos, 1, "air")
if npos then
self.object:move_to(npos)
end
self.node_inside = nil -- force get_node
return
end
-- Switch locals to node under
node = self.node_under
def = self.def_under
-- Slippery node check
if def and def.walkable then
local slippery = core.get_item_group(node.name, "slippery")
is_slippery = slippery ~= 0
if is_slippery and (math.abs(vel.x) > 0.2 or math.abs(vel.z) > 0.2) then
-- Horizontal deceleration
local slip_factor = 4.0 / (slippery + 4)
self.object:set_acceleration({
x = -vel.x * slip_factor,
y = 0,
z = -vel.z * slip_factor
})
elseif vel.y == 0 then
is_moving = false
end
end
if self.moving_state == is_moving
and self.slippery_state == is_slippery then
return -- No further updates until moving state changes
end
self.moving_state = is_moving
self.slippery_state = is_slippery
if is_moving then
self.object:set_acceleration({x = 0, y = -gravity, z = 0})
else
self.object:set_acceleration({x = 0, y = 0, z = 0})
self.object:set_velocity({x = 0, y = 0, z = 0})
end
--Only collect items if not moving
if is_moving then
return
end
-- Collect the items around to merge with
local own_stack = ItemStack(self.itemstring)
if own_stack:get_free_space() == 0 then
return
end
local objects = core.get_objects_inside_radius(pos, 1.0)
for k, obj in pairs(objects) do
local entity = obj:get_luaentity()
if entity and entity.name == "__builtin:item" then
if self:try_merge_with(own_stack, obj, entity) then
own_stack = ItemStack(self.itemstring)
if own_stack:get_free_space() == 0 then
return
end
end
end
end
end,
on_punch = function(self, hitter)
local inv = hitter:get_inventory()
if inv and self.itemstring ~= "" then
local left = inv:add_item("main", self.itemstring)
if left and not left:is_empty() then
self:set_item(left)
return
end
end
self.itemstring = ""
self.object:remove()
end,
})