VoxeLibre/mods/ENTITIES/mcl_mobs/api/mob_functions/environment.lua

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local minetest_line_of_sight = minetest.line_of_sight
local minetest_dir_to_yaw = minetest.dir_to_yaw
local minetest_yaw_to_dir = minetest.yaw_to_dir
local minetest_get_node = minetest.get_node
local minetest_get_item_group = minetest.get_item_group
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local minetest_get_objects_inside_radius = minetest.get_objects_inside_radius
local minetest_get_node_or_nil = minetest.get_node_or_nil
local minetest_registered_nodes = minetest.registered_nodes
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local minetest_get_connected_players = minetest.get_connected_players
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local vector_new = vector.new
local vector_multiply = vector.multiply
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local vector_distance = vector.distance
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local table_copy = table.copy
-- default function when mobs are blown up with TNT
local do_tnt = function(obj, damage)
obj.object:punch(obj.object, 1.0, {
full_punch_interval = 1.0,
damage_groups = {fleshy = damage},
}, nil)
return false, true, {}
end
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--a fast function to be able to detect only players without using objects_in_radius
mobs.detect_closest_player_within_radius = function(self, line_of_sight, radius, object_height_adder)
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local pos1 = self.object:get_pos()
local players_in_area = {}
local winner_player = nil
local players_detected = 0
--get players in radius
for _,player in pairs(minetest.get_connected_players()) do
if player and player:get_hp() > 0 then
local pos2 = player:get_pos()
local distance = vector.distance(pos1,pos2)
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if distance <= radius then
if line_of_sight then
--must add eye height or stuff breaks randomly because of
--seethrough nodes being a blocker (like grass)
if minetest_line_of_sight(
vector_new(pos1.x, pos1.y + object_height_adder, pos1.z),
vector_new(pos2.x, pos2.y + player:get_properties().eye_height, pos2.z)
) then
players_detected = players_detected + 1
players_in_area[player] = distance
end
else
players_detected = players_detected + 1
players_in_area[player] = distance
end
end
end
end
--return if there's no one near by
if players_detected <= 0 then --handle negative numbers for some crazy error that could possibly happen
return nil
end
--do a default radius max
local shortest_disance = radius + 1
--sort through players and find the closest player
for player,distance in pairs(players_in_area) do
if distance < shortest_disance then
shortest_disance = distance
winner_player = player
end
end
return(winner_player)
end
--check if a mob needs to jump
mobs.jump_check = function(self,dtime)
local pos = self.object:get_pos()
pos.y = pos.y + 0.1
local dir = minetest_yaw_to_dir(self.yaw)
local collisionbox = self.object:get_properties().collisionbox
local radius = collisionbox[4] + 0.5
vector_multiply(dir, radius)
--only jump if there's a node and a non-solid node above it
local test_dir = vector.add(pos,dir)
local green_flag_1 = minetest_get_item_group(minetest_get_node(test_dir).name, "solid") ~= 0
test_dir.y = test_dir.y + 1
local green_flag_2 = minetest_get_item_group(minetest_get_node(test_dir).name, "solid") == 0
if green_flag_1 and green_flag_2 then
--can jump over node
return(1)
elseif green_flag_1 and not green_flag_2 then
--wall in front of mob
return(2)
end
--nothing to jump over
return(0)
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end
-- a helper function to quickly turn neutral passive mobs hostile
local turn_hostile = function(self,detected_mob)
--drop in variables for attacking (stops crash)
detected_mob.punch_timer = 0
--set to hostile
detected_mob.hostile = true
--hostile_cooldown timer is initialized here
detected_mob.hostile_cooldown_timer = detected_mob.hostile_cooldown
--set target to the same
detected_mob.attacking = self.attacking
end
--allow hostile mobs to signal to other mobs
--to switch from neutal passive to neutral hostile
mobs.group_attack_initialization = function(self)
--get basic data
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local friends_list
if self.group_attack == true then
friends_list = {self.name}
else
friends_list = table_copy(self.group_attack)
end
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local objects_in_area = minetest_get_objects_inside_radius(self.object:get_pos(), self.view_range)
--get the player's name
local name = self.attacking:get_player_name()
--re-use local variable
local detected_mob
--run through mobs in viewing distance
for _,object in pairs(objects_in_area) do
if object and object:get_luaentity() then
detected_mob = object:get_luaentity()
-- only alert members of same mob or friends
if detected_mob._cmi_is_mob and detected_mob.state ~= "attack" and detected_mob.owner ~= name then
if detected_mob.name == self.name then
turn_hostile(self,detected_mob)
else
for _,id in pairs(friends_list) do
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if detected_mob.name == id then
turn_hostile(self,detected_mob)
break
end
end
end
end
--THIS NEEDS TO BE RE-IMPLEMENTED AS A GLOBAL HIT IN MOB_PUNCH!!
-- have owned mobs attack player threat
--if obj.owner == name and obj.owner_loyal then
-- do_attack(obj, self.object)
--end
end
end
end
-- check if within physical map limits (-30911 to 30927)
-- within_limits, wmin, wmax = nil, -30913, 30928
mobs.within_limits = function(pos, radius)
if mcl_vars then
if mcl_vars.mapgen_edge_min and mcl_vars.mapgen_edge_max then
wmin, wmax = mcl_vars.mapgen_edge_min, mcl_vars.mapgen_edge_max
within_limits = function(pos, radius)
return pos
and (pos.x - radius) > wmin and (pos.x + radius) < wmax
and (pos.y - radius) > wmin and (pos.y + radius) < wmax
and (pos.z - radius) > wmin and (pos.z + radius) < wmax
end
end
end
return pos
and (pos.x - radius) > wmin and (pos.x + radius) < wmax
and (pos.y - radius) > wmin and (pos.y + radius) < wmax
and (pos.z - radius) > wmin and (pos.z + radius) < wmax
end
-- get node but use fallback for nil or unknown
mobs.node_ok = function(pos, fallback)
fallback = fallback or mobs.fallback_node
local node = minetest_get_node_or_nil(pos)
if node and minetest_registered_nodes[node.name] then
return node
end
return minetest_registered_nodes[fallback]
end
--a teleport functoin
mobs.teleport = function(self, target)
if self.do_teleport then
if self.do_teleport(self, target) == false then
return
end
end
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end
--a function used for despawning mobs
mobs.check_for_player_within_area = function(self, radius)
local pos1 = self.object:get_pos()
--get players in radius
for _,player in pairs(minetest_get_connected_players()) do
if player and player:get_hp() > 0 then
local pos2 = player:get_pos()
local distance = vector_distance(pos1,pos2)
if distance < radius then
--found a player
return(true)
end
end
end
--did not find a player
return(false)
end