VoxeLibre/mods/ITEMS/mcl_mobspawners/init.lua

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local S = mobs.intllib
mcl_mobspawners = {}
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local default_mob = "mobs_mc:pig"
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-- Monster spawner
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local spawner_default = default_mob.." 0 15 4 15"
local function get_mob_textures(mob)
-- FIXME: Ummm … wtf? Why isn't there a textures attribute?
return minetest.registered_entities[mob].texture_list[1]
end
local function find_doll(pos)
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for _,obj in ipairs(minetest.get_objects_inside_radius(pos, 1)) do
if not obj:is_player() then
if obj ~= nil and obj:get_luaentity().name == "mcl_mobspawners:doll" then
return obj
end
end
end
return nil
end
local function spawn_doll(pos)
return minetest.add_entity({x=pos.x, y=pos.y-0.3, z=pos.z}, "mcl_mobspawners:doll")
end
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local function set_doll_properties(doll, mob)
local mobinfo = minetest.registered_entities[mob]
local prop = {
mesh = mobinfo.mesh,
textures = get_mob_textures(mob),
visual_size = {
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x = mobinfo.visual_size.x * 0.33333,
y = mobinfo.visual_size.y * 0.33333,
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}
}
doll:set_properties(prop)
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doll:get_luaentity()._mob = mob
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end
--[[ Public function: Setup the spawner at pos.
This function blindly assumes there's actually a spawner at pos.
If not, then the results are undefined.
All the arguments are optional!
* Mob: ID of mob to spawn (default: mobs_mc:pig)
* MinLight: Minimum light to spawn (default: 0)
* MaxLight: Maximum light to spawn (default: 15)
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* MaxMobsInArea: How many mobs are allowed in the area around the spawner (default: 4)
* PlayerDistance: Spawn mobs only if a player is within this distance; 0 to disable (default: 15)
* YOffset: Y offset to spawn mobs; 0 to disable (default: 0)
]]
function mcl_mobspawners.setup_spawner(pos, Mob, MinLight, MaxLight, MaxMobsInArea, PlayerDistance, YOffset)
-- Activate monster spawner and disable editing functionality
if Mob == nil then Mob = default_mob end
if MinLight == nil then MinLight = 0 end
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if MaxLight == nil then MaxLight = 15 end
if MaxMobsInArea == nil then MaxMobsInArea = 4 end
if PlayerDistance == nil then PlayerDistance = 15 end
if YOffset == nil then YOffset = 0 end
local meta = minetest.get_meta(pos)
meta:set_string("Mob", Mob)
meta:set_int("MinLight", MinLight)
meta:set_int("MaxLight", MaxLight)
meta:set_int("MaxMobsInArea", MaxMobsInArea)
meta:set_int("PlayerDistance", PlayerDistance)
meta:set_int("YOffset", YOffset)
-- Create doll
local doll = spawn_doll(pos)
set_doll_properties(doll, Mob)
-- Start spawning very soon
local t = minetest.get_node_timer(pos)
t:start(2)
end
-- Spawn monsters around pos
-- NOTE: The node is timer-based, rather than ABM-based.
local spawn_monsters = function(pos, elapsed)
-- get meta
local meta = minetest.get_meta(pos)
-- get settings
local mob = meta:get_string("Mob")
local mlig = meta:get_int("MinLight")
local xlig = meta:get_int("MaxLight")
local num = meta:get_int("MaxMobsInArea")
local pla = meta:get_int("PlayerDistance")
local yof = meta:get_int("YOffset")
-- if amount is 0 then do nothing
if num == 0 then
return
end
-- are we spawning a registered mob?
if not mobs.spawning_mobs[mob] then
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minetest.log("error", "[mcl_mobspawners] Monster Spawner: Mob doesn't exist: "..mob)
return
end
-- check objects inside 8×8 area around spawner
local objs = minetest.get_objects_inside_radius(pos, 8)
local count = 0
local ent = nil
local timer = minetest.get_node_timer(pos)
-- spawn mob if player detected and in range
if pla > 0 then
local in_range = 0
local objs = minetest.get_objects_inside_radius(pos, pla)
for _,oir in pairs(objs) do
if oir:is_player() then
in_range = 1
break
end
end
-- player not found
if in_range == 0 then
-- Try again quickly
timer:start(2)
return
end
end
--[[ HACK!
The doll may not stay spawned if the monster spawner is placed far away from
players, so we will check for its existance periodically when a player is nearby.
This would happen almost always when the monster spawner is placed by the mapgen.
This is probably caused by a Minetest bug:
https://github.com/minetest/minetest/issues/4759
FIXME: Fix this horrible hack.
]]
local doll = find_doll(pos)
if not doll then
doll = spawn_doll(pos)
set_doll_properties(doll, mob)
end
-- count mob objects of same type in area
for k, obj in ipairs(objs) do
ent = obj:get_luaentity()
if ent and ent.name and ent.name == mob then
count = count + 1
end
end
-- Are there too many of same type? then fail
if count >= num then
timer:start(math.random(5, 20))
return
end
-- find air blocks within 8×3×8 nodes of spawner
local air = minetest.find_nodes_in_area(
{x = pos.x - 4, y = pos.y - 1 + yof, z = pos.z - 4},
{x = pos.x + 4, y = pos.y + 1 + yof, z = pos.z + 4},
{"air"})
-- spawn up to 4 mobs in random air blocks
if air then
for a=1, 4 do
if #air <= 0 then
-- We're out of space! Stop spawning
break
end
local air_index = math.random(#air)
local pos2 = air[air_index]
local lig = minetest.get_node_light(pos2) or 0
pos2.y = pos2.y + 0.5
-- only if light levels are within range
if lig >= mlig and lig <= xlig then
minetest.add_entity(pos2, mob)
end
table.remove(air, air_index)
end
end
-- Spawn attempt done. Next spawn attempt much later
timer:start(math.random(10, 39.95))
end
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-- The monster spawner node.
-- PLACEMENT INSTRUCTIONS:
-- If this node is placed by a player, minetest.item_place, etc. default settings are applied
-- automatially.
-- IF this node is placed by ANY other method (e.g. minetest.set_node, LuaVoxelManip), you
-- MUST call mcl_mobspawners.setup_spawner right after the spawner has been placed.
minetest.register_node("mcl_mobspawners:spawner", {
tiles = {"mob_spawner.png"},
drawtype = "glasslike",
paramtype = "light",
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sunlight_propagates = true,
walkable = true,
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description = S("Monster Spawner"),
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_doc_items_longdesc = S("A monster spawner is a block which regularily causes monsters and animals to appear around it."),
groups = {pickaxey=1, not_in_creative_inventory = 1, material_stone=1},
is_ground_content = false,
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drop = "",
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-- If placed by player, setup spawner with default settings
on_place = function(itemstack, placer, pointed_thing)
local node_under = minetest.get_node(pointed_thing.under)
local new_itemstack, success = minetest.item_place(itemstack, placer, pointed_thing)
if success then
local placepos
if minetest.registered_nodes[node_under.name].buildable_to then
placepos = pointed_thing.under
else
placepos = pointed_thing.above
end
mcl_mobspawners.setup_spawner(placepos)
end
return new_itemstack
end,
on_destruct = function(pos)
local meta = minetest.get_meta(pos)
local obj = find_doll(pos)
if obj then
obj:remove()
end
end,
on_timer = spawn_monsters,
on_receive_fields = function(pos, formname, fields, sender)
if not fields.text or fields.text == "" then
return
end
local meta = minetest.get_meta(pos)
local comm = fields.text:split(" ")
local name = sender:get_player_name()
if minetest.is_protected(pos, name) then
minetest.record_protection_violation(pos, name)
return
end
local mob = comm[1] -- mob to spawn
local mlig = tonumber(comm[2]) -- min light
local xlig = tonumber(comm[3]) -- max light
local num = tonumber(comm[4]) -- total mobs in area
local pla = tonumber(comm[5]) -- player distance (0 to disable)
local yof = tonumber(comm[6]) or 0 -- Y offset to spawn mob
if mob and mob ~= "" and mobs.spawning_mobs[mob] == true
and num and num >= 0 and num <= 10
and mlig and mlig >= 0 and mlig <= 15
and xlig and xlig >= 0 and xlig <= 15
and pla and pla >=0 and pla <= 20
and yof and yof > -10 and yof < 10 then
mcl_mobspawners.setup_spawner(pos, mob, mlig, xlig, num, pla, yof)
else
minetest.chat_send_player(name, S("Mob Spawner settings failed!"))
minetest.chat_send_player(name,
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S("Syntax: name min_light[0-14] max_light[0-14] max_mobs_in_area[0 to disable] distance[1-20] y_offset[-10 to 10]"))
end
end,
sounds = mcl_sounds.node_sound_metal_defaults(),
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_mcl_blast_resistance = 25,
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_mcl_hardness = 5,
})
-- Mob spawner doll (rotating icon inside cage)
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local doll_def = {
hp_max = 1,
physical = true,
collisionbox = {0,0,0,0,0,0},
visual = "mesh",
makes_footstep_sound = false,
timer = 0,
automatic_rotate = math.pi * 2.9,
_mob = default_mob, -- name of the mob this doll represents
}
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doll_def.get_staticdata = function(self)
return self._mob
end
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doll_def.on_activate = function(self, staticdata, dtime_s)
local mob = staticdata
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if mob == "" or mob == nil then
mob = default_mob
end
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set_doll_properties(self.object, mob)
self.object:setvelocity({x=0, y=0, z=0})
self.object:setacceleration({x=0, y=0, z=0})
self.object:set_armor_groups({immortal=1})
end
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doll_def.on_step = function(self, dtime)
-- Check if spawner is still present. If not, delete the entity
self.timer = self.timer + 0.01
local n = minetest.get_node_or_nil(self.object:getpos())
if self.timer > 1 then
if n and n.name and n.name ~= "mcl_mobspawners:spawner" then
self.object:remove()
end
end
end
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doll_def.on_punch = function(self, hitter) end
minetest.register_entity("mcl_mobspawners:doll", doll_def)