server-nalc/mods/mobs/api.lua

-- Mobs Api (29th May 2015)
mobs = {}
mobs.mod = "redo"

-- Do mobs spawn in protected areas (0=yes, 1=no)
mobs.protected = 1

-- Initial settings check
local damage_enabled = minetest.setting_getbool("enable_damage")
local peaceful_only = minetest.setting_getbool("only_peaceful_mobs")
local enable_blood = minetest.setting_getbool("mobs_enable_blood") or true

function mobs:register_mob(name, def)
	minetest.register_entity(name, {
		stepheight = def.stepheight or 0.6,
		name = name,
		fly = def.fly,
		fly_in = def.fly_in or "air",
		owner = def.owner,
		order = def.order or "",
		on_die = def.on_die,
		jump_height = def.jump_height or 6,
		jump_chance = def.jump_chance or 0,
		rotate = def.rotate or 0, -- 0=front, 1.5=side, 3.0=back, 4.5=side2
		lifetimer = def.lifetimer or 600,
		hp_min = def.hp_min or 5,
		hp_max = def.hp_max or 10,
		physical = true,
		collisionbox = def.collisionbox,
		visual = def.visual,
		visual_size = def.visual_size or {x=1, y=1},
		mesh = def.mesh,
		makes_footstep_sound = def.makes_footstep_sound or false,
		view_range = def.view_range or 5,
		walk_velocity = def.walk_velocity or 1,
		run_velocity = def.run_velocity or 2,
		damage = def.damage,
		light_damage = def.light_damage,
		water_damage = def.water_damage,
		lava_damage = def.lava_damage,
		fall_damage = def.fall_damage or 1,
		fall_speed = def.fall_speed or -10, -- must be lower than -2 (default: -10)
		drops = def.drops or {},
		armor = def.armor,
		on_rightclick = def.on_rightclick,
		type = def.type,
		attack_type = def.attack_type,
		arrow = def.arrow,
		shoot_interval = def.shoot_interval,
		sounds = def.sounds or {},
		animation = def.animation,
		follow = def.follow or "",
		jump = def.jump or true,
		walk_chance = def.walk_chance or 50,
		attacks_monsters = def.attacks_monsters or false,
		group_attack = def.group_attack or false,
		--fov = def.fov or 120,
		passive = def.passive or false,
		recovery_time = def.recovery_time or 0.5,
		knock_back = def.knock_back or 3,
		blood_amount = def.blood_amount or 5,
		blood_texture = def.blood_texture or "mobs_blood.png",
		shoot_offset = def.shoot_offset or 0,
		floats = def.floats or 1, -- floats in water by default
		replace_rate = def.replace_rate,
		replace_what = def.replace_what,
		replace_with = def.replace_with,
		replace_offset = def.replace_offset or 0,
		timer = 0,
		env_damage_timer = 0, -- only if state = "attack"
		attack = {player=nil, dist=nil},
		state = "stand",
		tamed = false,
		pause_timer = 0,
		horny = false,
		hornytimer = 0,
		child = false,
		gotten = false,
		owner = "",
		health = 0,

		do_attack = function(self, player, dist)
			if self.state ~= "attack" then
				if math.random(0,100) < 90  and self.sounds.war_cry then
					minetest.sound_play(self.sounds.war_cry,{object = self.object})
				end
				self.state = "attack"
				self.attack.player = player
				self.attack.dist = dist
			end
		end,

		set_velocity = function(self, v)
			if not v then v = 0 end
			if def.drawtype and def.drawtype == "side" then self.rotate = 1.5 end
			local yaw = self.object:getyaw() + self.rotate
			local x = math.sin(yaw) * -v
			local z = math.cos(yaw) * v
			self.object:setvelocity({x=x, y=self.object:getvelocity().y, z=z})
		end,

		get_velocity = function(self)
			local v = self.object:getvelocity()
			return (v.x^2 + v.z^2)^(0.5)
		end,
--[[
		in_fov = function(self,pos)
			-- checks if POS is in self's FOV
			local yaw = self.object:getyaw() + self.rotate
			local vx = math.sin(yaw)
			local vz = math.cos(yaw)
			local ds = math.sqrt(vx^2 + vz^2)
			local ps = math.sqrt(pos.x^2 + pos.z^2)
			local d = { x = vx / ds, z = vz / ds }
			local p = { x = pos.x / ps, z = pos.z / ps }

			local an = ( d.x * p.x ) + ( d.z * p.z )

			a = math.deg( math.acos( an ) )

			if a > ( self.fov / 2 ) then
				return false
			else
				return true
			end
		end,
]]
		set_animation = function(self, type)
			if not self.animation then
				return
			end
			if not self.animation.current then
				self.animation.current = ""
			end
			if type == "stand" and self.animation.current ~= "stand" then
				if self.animation.stand_start and self.animation.stand_end and self.animation.speed_normal then
					self.object:set_animation({x=self.animation.stand_start,
						y=self.animation.stand_end},self.animation.speed_normal, 0)
					self.animation.current = "stand"
				end
			elseif type == "walk" and self.animation.current ~= "walk"  then
				if self.animation.walk_start and self.animation.walk_end and self.animation.speed_normal then
					self.object:set_animation({x=self.animation.walk_start,y=self.animation.walk_end},
						self.animation.speed_normal, 0)
					self.animation.current = "walk"
				end
			elseif type == "run" and self.animation.current ~= "run"  then
				if self.animation.run_start and self.animation.run_end and self.animation.speed_run then
					self.object:set_animation({x=self.animation.run_start,y=self.animation.run_end},
						self.animation.speed_run, 0)
					self.animation.current = "run"
				end
			elseif type == "punch" and self.animation.current ~= "punch"  then
				if self.animation.punch_start and self.animation.punch_end and self.animation.speed_normal then
					self.object:set_animation({x=self.animation.punch_start,y=self.animation.punch_end},
						self.animation.speed_normal, 0)
					self.animation.current = "punch"
				end
			end
		end,

		on_step = function(self, dtime)

			if self.type == "monster" and peaceful_only then
				self.object:remove()
				return
			end

			-- if lifetimer run out and not npc; tamed or attacking then remove mob
			if self.type ~= "npc" and not self.tamed then
				self.lifetimer = self.lifetimer - dtime
				if self.lifetimer <= 0 and self.state ~= "attack" then
					minetest.log("action","lifetimer expired, removed "..self.name)
					effect(self.object:getpos(), 15, "tnt_smoke.png")
					self.object:remove()
					return
				end
			end

			-- check for mob drop/replace (used for chicken egg and sheep eating grass/wheat)
			if self.replace_rate
			and self.child == false
			and math.random(1,self.replace_rate) == 1 then
				local pos = self.object:getpos()
				pos.y = pos.y + self.replace_offset
				if self.replace_what
				and self.object:getvelocity().y == 0
				and #minetest.find_nodes_in_area(pos, pos, self.replace_what) > 0 then
				--and self.state == "stand" then
					minetest.set_node(pos, {name = self.replace_with})
				end
			end

			local yaw = 0

			-- jump direction (adapted from Carbone mobs), gravity, falling or floating in water
			if not self.fly then
				if self.object:getvelocity().y > 0.1 then
					yaw = self.object:getyaw() + self.rotate
					local x = math.sin(yaw) * -2
					local z = math.cos(yaw) * 2

					if minetest.get_item_group(minetest.get_node(self.object:getpos()).name, "water") ~= 0 then
						if self.floats == 1 then self.object:setacceleration({x = x, y = 1.5, z = z}) end
					else
						self.object:setacceleration({x = x, y = self.fall_speed, z = z})
					end
				else
					if minetest.get_item_group(minetest.get_node(self.object:getpos()).name, "water") ~= 0 then
						if self.floats == 1 then self.object:setacceleration({x = 0, y = 1.5, z = 0}) end
					else
						self.object:setacceleration({x = 0, y = self.fall_speed, z = 0})
					end
				end

				-- fall damage
				if self.fall_damage == 1 and self.object:getvelocity().y == 0 then
					local d = self.old_y - self.object:getpos().y
					if d > 5 then
						self.object:set_hp(self.object:get_hp() - math.floor(d - 5))
						effect(self.object:getpos(), 5, "tnt_smoke.png")
						check_for_death(self)
					end
					self.old_y = self.object:getpos().y
				end
			end

			-- knockback timer
			if self.pause_timer > 0 then
				self.pause_timer = self.pause_timer - dtime
				if self.pause_timer < 1 then
					self.pause_timer = 0
				end
				return
			end

			-- attack timer
			self.timer = self.timer + dtime
			if self.state ~= "attack" then
				if self.timer < 1 then
					return
				end
				self.timer = 0
			end

			if self.sounds.random and math.random(1, 100) <= 1 then
				minetest.sound_play(self.sounds.random, {object = self.object})
			end

			local do_env_damage = function(self)

				local pos = self.object:getpos()
				local n = minetest.get_node(pos)
				local tod = minetest.get_timeofday()
				pos.y = (pos.y + self.collisionbox[2]) -- foot level
--print ("standing on:", minetest.get_node(pos).name)
				if self.light_damage and self.light_damage ~= 0
				and pos.y > 0
				and tod > 0.2 and tod < 0.8
				and (minetest.get_node_light(pos) or 0) > 10 then
					self.object:set_hp(self.object:get_hp()-self.light_damage)
					effect(pos, 5, "tnt_smoke.png")
					check_for_death(self)
				end

				if self.water_damage and self.water_damage ~= 0
				and minetest.get_item_group(n.name, "water") ~= 0 then
					self.object:set_hp(self.object:get_hp()-self.water_damage)
					effect(pos, 5, "bubble.png")
					check_for_death(self)
				end

				if self.lava_damage and self.lava_damage ~= 0
				and minetest.get_item_group(n.name, "lava") ~= 0 then
					self.object:set_hp(self.object:get_hp()-self.lava_damage)
					effect(pos, 5, "fire_basic_flame.png")
					check_for_death(self)
				end

			end

			local do_jump = function(self)
				if self.fly then return end

				self.jumptimer = (self.jumptimer or 0) + 1
				if self.jumptimer < 3 then
					local pos = self.object:getpos()
					pos.y = (pos.y + self.collisionbox[2]) - 0.2
					local nod = minetest.get_node(pos)
--print ("standing on:", nod.name, pos.y)
					if not nod or not minetest.registered_nodes[nod.name]
					or minetest.registered_nodes[nod.name].walkable == false then return end
					if self.direction then
 						pos.y = pos.y + 0.5
						local nod = minetest.get_node_or_nil({x=pos.x + self.direction.x,y=pos.y,z=pos.z + self.direction.z})
--print ("in front:", nod.name, pos.y)
						if nod and nod.name and (nod.name ~= "air"  or self.walk_chance == 0) then
							local def = minetest.registered_items[nod.name]
							if (def and def.walkable and not nod.name:find("fence")) or self.walk_chance == 0 then
								local v = self.object:getvelocity()
								v.y = self.jump_height + 1
								v.x = v.x * 2.2
								v.z = v.z * 2.2
								self.object:setvelocity(v)
								if self.sounds.jump then
									minetest.sound_play(self.sounds.jump, {object = self.object})
								end
							end
						end
					end
				else
					self.jumptimer = 0
				end
			end

			-- environmental damage timer
			self.env_damage_timer = self.env_damage_timer + dtime
			if self.state == "attack" and self.env_damage_timer > 1 then
				self.env_damage_timer = 0
				do_env_damage(self)
			elseif self.state ~= "attack" then
				do_env_damage(self)
			end

			-- find someone to attack
			if self.type == "monster" and damage_enabled and self.state ~= "attack" then

				local s = self.object:getpos()
				local p, sp, dist
				local player = nil
				local type = nil
				local obj = nil
				local min_dist = self.view_range + 1
				local min_player = nil

				for _,oir in ipairs(minetest.get_objects_inside_radius(s,self.view_range)) do

					if oir:is_player() then
						player = oir
						type = "player"
					else
						obj = oir:get_luaentity()
						if obj then
							player = obj.object
							type = obj.type
						end
					end

					if type == "player" or type == "npc" then
						s = self.object:getpos()
						p = player:getpos()
						sp = s
						p.y = p.y + 1
						sp.y = sp.y + 1		-- aim higher to make looking up hills more realistic
						dist = ((p.x-s.x)^2 + (p.y-s.y)^2 + (p.z-s.z)^2)^0.5
						if dist < self.view_range then -- and self.in_fov(self,p) then
							-- choose closest player to attack
							if minetest.line_of_sight(sp,p,2) == true
							and dist < min_dist then
								min_dist = dist
								min_player = player
							end
						end
					end
				end
				-- attack player
				if min_player then
					self.do_attack(self, min_player, min_dist)
				end
			end

			-- npc, find closest monster to attack
			local min_dist = self.view_range + 1
			local min_player = nil

			if self.type == "npc" and self.attacks_monsters and self.state ~= "attack" then
				local s = self.object:getpos()
				local obj = nil
				for _, oir in pairs(minetest.get_objects_inside_radius(s,self.view_range)) do
					obj = oir:get_luaentity()
					if obj and obj.type == "monster" then
						-- attack monster
						local p = obj.object:getpos()
						local dist = ((p.x-s.x)^2 + (p.y-s.y)^2 + (p.z-s.z)^2)^0.5
						if dist < min_dist then
							min_dist = dist
							min_player = obj.object
						end
					end
				end
				if min_player then
					self.do_attack(self, min_player, min_dist)
				end
			end

			-- horny animal can mate for 40 seconds, afterwards horny animal cannot mate again for 200 seconds
			if self.horny == true and self.hornytimer < 240 and self.child == false then
				self.hornytimer = self.hornytimer + 1
				if self.hornytimer >= 240 then
					self.hornytimer = 0
					self.horny = false
				end
			end

			-- if animal is child take 240 seconds before growing into adult
			if self.child == true then
				self.hornytimer = self.hornytimer + 1
				if self.hornytimer > 240 then
					self.child = false
					self.hornytimer = 0
					self.object:set_properties({
						textures = self.base_texture,
						mesh = self.base_mesh,
						visual_size = {x=self.visual_size.x,y=self.visual_size.y},
						collisionbox = self.collisionbox,
					})
				end
			end

			-- if animal is horny, find another same animal who is horny and mate
			if self.horny == true and self.hornytimer <= 40 then
				local pos = self.object:getpos()
				effect({x=pos.x, y=pos.y+1, z=pos.z}, 4, "heart.png")
				local ents = minetest.get_objects_inside_radius(pos, self.view_range)
				local num = 0
				local ent = nil
				for i,obj in ipairs(ents) do
					ent = obj:get_luaentity()
					if ent and ent.name == self.name and ent.horny == true and ent.hornytimer <= 40 then num = num + 1 end
					if num > 1 then
						self.hornytimer = 41
						ent.hornytimer = 41
						minetest.after(7, function(dtime)
							local mob = minetest.add_entity(pos, self.name)
							local ent2 = mob:get_luaentity()
							local textures = self.base_texture
							if def.child_texture then
								textures = def.child_texture[1]
							end
							mob:set_properties({
								textures = textures,
								visual_size = {x=self.visual_size.x/2,y=self.visual_size.y/2},
								collisionbox = {self.collisionbox[1]/2, self.collisionbox[2]/2, self.collisionbox[3]/2,
												self.collisionbox[4]/2, self.collisionbox[5]/2, self.collisionbox[6]/2},
							})
							ent2.child = true
							ent2.tamed = true
							ent2.following = ent -- follow mother
						end)
						num = 0
						break
					end
				end
			end

			-- find player to follow
			if (self.follow ~= "" or self.order == "follow") and not self.following and self.state ~= "attack" then
				local s, p, dist
				for _,player in pairs(minetest.get_connected_players()) do
					s = self.object:getpos()
					p = player:getpos()
					dist = ((p.x-s.x)^2 + (p.y-s.y)^2 + (p.z-s.z)^2)^0.5
					if dist < self.view_range then
						self.following = player
						break
					end
				end
			end

			if self.type == "npc" and self.order == "follow" and self.state ~= "attack" then
				-- npc stop following player if not owner
				if self.following and self.type == "npc" and self.owner and self.owner ~= self.following:get_player_name() then
					self.following = nil
				end
			else
				-- stop following player if not holding specific item
				if self.following and self.following.is_player and self.following:get_wielded_item():get_name() ~= self.follow then
					self.following = nil
				end
			end

			-- follow player or mob
			if self.following then
				local s = self.object:getpos()
				local p

				if self.following.is_player and self.following:is_player() then
					p = self.following:getpos()
				elseif self.following.object then
					p = self.following.object:getpos()
				end

				if p then
					local dist = ((p.x-s.x)^2 + (p.y-s.y)^2 + (p.z-s.z)^2)^0.5
					if dist > self.view_range then
						self.following = nil
					else
						local vec = {x=p.x-s.x, y=p.y-s.y, z=p.z-s.z}
						yaw = (math.atan(vec.z/vec.x)+math.pi/2) + self.rotate -- local
						if p.x > s.x then
							yaw = yaw+math.pi
						end
						self.object:setyaw(yaw)

						-- anyone but standing npc's can move along
						if dist > 2 and self.order ~= "stand" then
							if (self.jump and self.get_velocity(self) <= 0.5 and self.object:getvelocity().y == 0)
							or (self.object:getvelocity().y == 0 and self.jump_chance > 0) then
								self.direction = {x = math.sin(yaw)*-1, y = -20, z = math.cos(yaw)}
								do_jump(self)
							end
							self.set_velocity(self, self.walk_velocity)
							if self.walk_chance ~= 0 then
								self:set_animation("walk")
							end
						else
							self.set_velocity(self, 0)
							self:set_animation("stand")
						end
						return
					end
				end
			end

			if self.state == "stand" then
				-- randomly turn
				if math.random(1, 4) == 1 then
					-- if there is a player nearby look at them
					local lp = nil
					local s = self.object:getpos()

					if self.type == "npc" then
						local o = minetest.get_objects_inside_radius(self.object:getpos(), 3)

						local yaw = 0
						for _,o in ipairs(o) do
							if o:is_player() then
								lp = o:getpos()
								break
							end
						end
					end

					if lp ~= nil then
						local vec = {x=lp.x-s.x, y=lp.y-s.y, z=lp.z-s.z}
						yaw = (math.atan(vec.z/vec.x)+math.pi/2) + self.rotate
						if lp.x > s.x then
							yaw = yaw+math.pi
						end
					else
						yaw = self.object:getyaw()+((math.random(0,360)-180)/180*math.pi)
					end
					self.object:setyaw(yaw)
				end

				self.set_velocity(self, 0)
				self.set_animation(self, "stand")

				-- npc's ordered to stand stay standing
				if self.type == "npc" and self.order == "stand" then
					self.set_velocity(self, 0)
					self.state = "stand"
					self:set_animation("stand")
				else
					if self.walk_chance ~= 0 and math.random(1, 100) <= self.walk_chance then
						self.set_velocity(self, self.walk_velocity)
						self.state = "walk"
						self.set_animation(self, "walk")
					end

					-- jumping mobs only
--					if self.jump and math.random(1, 100) <= self.jump_chance then
--						self.direction = {x=0, y=0, z=0}
--						do_jump(self)
--						self.set_velocity(self, self.walk_velocity)
--					end
				end

			elseif self.state == "walk" then
				local s = self.object:getpos()
				local lp = minetest.find_node_near(s, 1, {"group:water"})
				-- if water nearby then turn away
				if lp then
					local vec = {x=lp.x-s.x, y=lp.y-s.y, z=lp.z-s.z}
					yaw = math.atan(vec.z/vec.x) + 3*math.pi / 2 + self.rotate
					if lp.x > s.x then
						yaw = yaw+math.pi
					end
					self.object:setyaw(yaw)

				-- otherwise randomly turn
				elseif math.random(1, 100) <= 30 then
					self.object:setyaw(self.object:getyaw()+((math.random(0,360)-180)/180*math.pi))
				end
				if self.jump and self.get_velocity(self) <= 0.5 and self.object:getvelocity().y == 0 then
					self.direction = {x = math.sin(yaw)*-1, y = -20, z = math.cos(yaw)}
					do_jump(self)
				end

				self:set_animation("walk")
				self.set_velocity(self, self.walk_velocity)
				if math.random(1, 100) <= 30 then
					self.set_velocity(self, 0)
					self.state = "stand"
					self:set_animation("stand")
				end

			-- exploding mobs
			elseif self.state == "attack" and self.attack_type == "explode" then
				if not self.attack.player or not self.attack.player:is_player() then
					self.state = "stand"
					self:set_animation("stand")
					self.timer = 0
					self.blinktimer = 0
					return
				end
				local s = self.object:getpos()
				local p = self.attack.player:getpos()
				local dist = ((p.x - s.x) ^ 2 + (p.y - s.y) ^ 2 + (p.z - s.z) ^ 2) ^ 0.5
				if dist > self.view_range or self.attack.player:get_hp() <= 0 then
					self.state = "stand"
					self.v_start = false
					self.set_velocity(self, 0)
					self.timer = 0
					self.blinktimer = 0
					self.attack = {player = nil, dist = nil}
					self:set_animation("stand")
					return
				else
					self:set_animation("walk")
					self.attack.dist = dist
				end

				local vec = {x = p.x -s.x, y = p.y -s.y, z = p.z -s.z}
				yaw = math.atan(vec.z/vec.x)+math.pi/2 + self.rotate -- local
				if p.x > s.x then
					yaw = yaw+math.pi
				end
				self.object:setyaw(yaw)
				if self.attack.dist > 3 then
					if not self.v_start then
						self.v_start = true
						self.set_velocity(self, self.run_velocity)
						self.timer = 0
						self.blinktimer = 0
					else
					     self.timer = 0
						 self.blinktimer = 0
						if self.get_velocity(self) <= 0.5 and self.object:getvelocity().y == 0 then
							local v = self.object:getvelocity()
							v.y = 5
							self.object:setvelocity(v)
						end
						self.set_velocity(self, self.run_velocity)
					end
					self:set_animation("run")
				else
					self.set_velocity(self, 0)
					self.timer = self.timer + dtime
					self.blinktimer = (self.blinktimer or 0) + dtime
					if self.blinktimer > 0.2 then
						self.blinktimer = 0
						if self.blinkstatus then
							self.object:settexturemod("")
						else
							self.object:settexturemod("^[brighten")
						end
						self.blinkstatus = not self.blinkstatus
					end
					if self.timer > 3 then
						local pos = vector.round(self.object:getpos())
						entity_physics(pos, 3, self) -- hurt player/mobs caught in blast area --/MFF (Crabman|06/23/2015)add self to use punch function
						if minetest.find_node_near(pos, 1, {"group:water"})
						or minetest.is_protected(pos, "") then
							self.object:remove()
							if self.sounds.explode ~= "" then
								minetest.sound_play(self.sounds.explode, {pos = pos, gain = 1.0, max_hear_distance = 16})
							end
							pos.y = pos.y + 1
							effect(pos, 15, "tnt_smoke.png", 5)
							return
						end
						self.object:remove()
						mobs:explosion(pos, 2, 0, 1, "tnt_explode", self.sounds.explode)
					end
				end
				-- end of exploding mobs

			elseif self.state == "attack" and self.attack_type == "dogfight" then
				if not self.attack.player or not self.attack.player:getpos() then
					print("stop attacking")
					self.state = "stand"
					self:set_animation("stand")
					return
				end
				local s = self.object:getpos()
				local p = self.attack.player:getpos()
				local dist = ((p.x-s.x)^2 + (p.y-s.y)^2 + (p.z-s.z)^2)^0.5

				-- fly bit modified from BlockMens creatures mod
				if self.fly and dist > 2 then

					local nod = minetest.get_node_or_nil(s)
					local p1 = s
					local me_y = math.floor(p1.y)
					local p2 = p
					local p_y = math.floor(p2.y+1)
					local v = self.object:getvelocity()
					if nod and nod.name == self.fly_in then
						if me_y < p_y then
							self.object:setvelocity({x=v.x,y=1*self.walk_velocity,z=v.z})
						elseif me_y > p_y then
							self.object:setvelocity({x=v.x,y=-1*self.walk_velocity,z=v.z})
						end
					else
						if me_y < p_y then
							self.object:setvelocity({x=v.x,y=0.01,z=v.z})
						elseif me_y > p_y then
							self.object:setvelocity({x=v.x,y=-0.01,z=v.z})
						end
					end

				end
				-- end fly bit

				if dist > self.view_range or self.attack.player:get_hp() <= 0 then
					self.state = "stand"
					self.set_velocity(self, 0)
					self.attack = {player=nil, dist=nil}
					self:set_animation("stand")
					return
				else
					self.attack.dist = dist
				end

				local vec = {x=p.x-s.x, y=p.y-s.y, z=p.z-s.z}
				yaw = (math.atan(vec.z/vec.x)+math.pi/2) + self.rotate -- local
				if p.x > s.x then
					yaw = yaw+math.pi
				end
				self.object:setyaw(yaw)
				-- attack distance is 2 + half of mob width so the bigger mobs can attack (like slimes)
				if self.attack.dist > ((-self.collisionbox[1]+self.collisionbox[4])/2)+2 then
					-- jump attack
					if (self.jump and self.get_velocity(self) <= 0.5 and self.object:getvelocity().y == 0)
					or (self.object:getvelocity().y == 0 and self.jump_chance > 0) then
						self.direction = {x = math.sin(yaw)*-1, y = -20, z = math.cos(yaw)}
						do_jump(self)
					end
					self.set_velocity(self, self.run_velocity)
					self:set_animation("run")
				else
					self.set_velocity(self, 0)
					self:set_animation("punch")
					if self.timer > 1 then
						self.timer = 0
						local p2 = p
						local s2 = s
						p2.y = p2.y + 1.5
						s2.y = s2.y + 1.5
						if minetest.line_of_sight(p2,s2) == true then
							if self.sounds.attack then
								minetest.sound_play(self.sounds.attack, {object = self.object})
							end
							self.attack.player:punch(self.object, 1.0,  {
								full_punch_interval=1.0,
								damage_groups = {fleshy=self.damage}
							}, vec)
							if self.attack.player:get_hp() <= 0 then
								self.state = "stand"
								self:set_animation("stand")
							end
						end
					end
				end

			elseif self.state == "attack" and self.attack_type == "shoot" then

				if not self.attack.player or not self.attack.player:is_player() then
					self.state = "stand"
					self:set_animation("stand")
					return
				end
				local s = self.object:getpos()
				local p = self.attack.player:getpos()
				p.y = p.y - .5
				s.y = s.y + .5
				local dist = ((p.x-s.x)^2 + (p.y-s.y)^2 + (p.z-s.z)^2)^0.5
				if dist > self.view_range or self.attack.player:get_hp() <= 0 then
					self.state = "stand"
					self.set_velocity(self, 0)
					if self.type ~= "npc" then
						self.attack = {player=nil, dist=nil}
					end
					self:set_animation("stand")
					return
				else
					self.attack.dist = dist
				end

				local vec = {x=p.x-s.x, y=p.y-s.y, z=p.z-s.z}
				yaw = (math.atan(vec.z/vec.x)+math.pi/2) + self.rotate -- local
				if p.x > s.x then
					yaw = yaw+math.pi
				end
				self.object:setyaw(yaw)
				self.set_velocity(self, 0)

				if self.shoot_interval and self.timer > self.shoot_interval and math.random(1, 100) <= 60 then
					self.timer = 0

					self:set_animation("punch")

					if self.sounds.attack then
						minetest.sound_play(self.sounds.attack, {object = self.object})
					end

					local p = self.object:getpos()
					p.y = p.y + (self.collisionbox[2]+self.collisionbox[5])/2
					local obj = minetest.add_entity(p, self.arrow)
					local amount = (vec.x^2+vec.y^2+vec.z^2)^0.5
					local v = obj:get_luaentity().velocity
					vec.y = vec.y + self.shoot_offset -- this makes shoot aim accurate
					vec.x = vec.x*v/amount
					vec.y = vec.y*v/amount
					vec.z = vec.z*v/amount
					obj:setvelocity(vec)
				end
			end
		end,

		on_activate = function(self, staticdata, dtime_s)
			if self.type == "monster" and peaceful_only then
				self.object:remove()
			end

			self.health = math.random (self.hp_min, self.hp_max) -- set initial HP
			self.object:set_hp( self.health )
			self.health = self.object:get_hp()
			self.object:set_armor_groups({fleshy=self.armor})
			self.object:setacceleration({x=0, y= self.fall_speed, z=0})
			self.state = "stand"
			self.object:setvelocity({x=0, y=self.object:getvelocity().y, z=0})
			self.old_y = self.object:getpos().y
			self.object:setyaw(math.random(1, 360)/180*math.pi)

			if staticdata then
				local tmp = minetest.deserialize(staticdata)
				if tmp then
					if tmp.lifetimer then
						self.lifetimer = tmp.lifetimer
					end
					if tmp.tamed then
						self.tamed = tmp.tamed
					end
					if tmp.gotten then
						self.gotten = tmp.gotten
					end
					if tmp.child then
						self.child = tmp.child
					end
					if tmp.horny then
						self.horny = tmp.horny
					end
					if tmp.hornytimer then
						self.hornytimer = tmp.hornytimer
					end
					if tmp.textures then
						self.textures = tmp.textures
					end
					if tmp.mesh then
						self.mesh = tmp.mesh
					end
					if tmp.base_texture then
						self.base_texture = tmp.base_texture
					end
					if tmp.base_mesh then
						self.base_mesh = tmp.base_mesh
					end
					if tmp.owner then
						self.owner = tmp.owner
					end
					if tmp.health then
						self.health = tmp.health
						self.object:set_hp( self.health )
					end
				end
			end
		end,

		get_staticdata = function(self)
			-- select random texture, set model
			if not self.base_texture then
				self.base_texture = def.textures[math.random(1,#def.textures)]
				self.base_mesh = def.mesh
			end
			-- set texture, model and size
			local textures = self.base_texture
			local mesh = self.base_mesh
			local vis_size = self.visual_size
			local colbox = self.collisionbox
			-- specific texture if gotten
			if self.gotten == true and def.gotten_texture then
				textures = def.gotten_texture
			end
			-- specific mesh if gotten
			if self.gotten == true and def.gotten_mesh then
				mesh = def.gotten_mesh
			end
			-- if object is child then set half size
			if self.child == true then
				vis_size = {x=self.visual_size.x/2,y=self.visual_size.y/2}
				if def.child_texture then
					textures = def.child_texture[1]
				end
				colbox = {self.collisionbox[1]/2, self.collisionbox[2]/2, self.collisionbox[3]/2,
						self.collisionbox[4]/2, self.collisionbox[5]/2, self.collisionbox[6]/2}
			end
			-- remember settings
			local tmp = {
				lifetimer = self.lifetimer,
				tamed = self.tamed,
				gotten = self.gotten,
				child = self.child,
				horny = self.horny,
				hornytimer = self.hornytimer,
				mesh = mesh,
				textures = textures,
				visual_size = vis_size,
				base_texture = self.base_texture,
				collisionbox = colbox,
				owner = self.owner,
				health = self.health,
			}
			self.object:set_properties(tmp)
			return minetest.serialize(tmp)
		end,

		on_punch = function(self, hitter, tflp, tool_capabilities, dir)
			-- weapon wear
			local weapon = hitter:get_wielded_item()
			if weapon:get_definition().tool_capabilities ~= nil then
				local wear = ( weapon:get_definition().tool_capabilities.full_punch_interval / 75 ) * 9000
				weapon:add_wear(wear)
				hitter:set_wielded_item(weapon)
			end

			-- weapon sounds
			if weapon:get_definition().sounds ~= nil then
				local s = math.random(0,#weapon:get_definition().sounds)
				minetest.sound_play(weapon:get_definition().sounds[s], {
					object=hitter,
				})
			else
				minetest.sound_play("default_punch", {
					object = hitter,
				})
			end

			check_for_death(self)

			-- blood_particles
			local pos = self.object:getpos()
			pos.y = pos.y + (-self.collisionbox[2] + self.collisionbox[5]) / 2
			if self.blood_amount > 0 and pos and enable_blood == true then
				effect(pos, self.blood_amount, self.blood_texture)
			end

			-- knock back effect, adapted from blockmen's pyramids mod
			local kb = self.knock_back
			local r = self.recovery_time
			local v = self.object:getvelocity()
			if tflp < tool_capabilities.full_punch_interval then
				kb = kb * ( tflp / tool_capabilities.full_punch_interval )
				r = r * ( tflp / tool_capabilities.full_punch_interval )
			end
			self.object:setvelocity({x=dir.x*kb,y=0,z=dir.z*kb})
			self.pause_timer = r

			-- attack puncher and call other mobs for help
			if self.passive == false and not self.tamed then
				if self.state ~= "attack" then
					self.do_attack(self,hitter,1)
				end
				-- alert others to the attack
				local obj = nil
				for _, oir in pairs(minetest.get_objects_inside_radius(hitter:getpos(),5)) do
					obj = oir:get_luaentity()
					if obj then
						if obj.group_attack == true and obj.state ~= "attack" then
							obj.do_attack(obj,hitter,1)
						end
					end
				end
			end
		end,
	})
end

mobs.spawning_mobs = {}

function mobs:spawn_specific(name, nodes, neighbors, min_light, max_light, interval, chance, active_object_count, min_height, max_height)
	mobs.spawning_mobs[name] = true
	minetest.register_abm({
		nodenames = nodes,
		neighbors = neighbors,
		interval = interval,
		chance = chance,
		action = function(pos, node, _, active_object_count_wider)
			-- do not spawn if too many active in area
			if active_object_count_wider > active_object_count
			or not mobs.spawning_mobs[name]
			or not pos then
				return
			end

			-- spawn above node
			pos.y = pos.y + 1

			-- mobs cannot spawn inside protected areas if enabled
			if mobs.protected == 1 and minetest.is_protected(pos, "") then
				return
			end

			-- check if light and height levels are ok to spawn
			local light = minetest.get_node_light(pos)
			if not light or light > max_light or light < min_light
			or pos.y > max_height or pos.y < min_height then
				return
			end

			-- are we spawning inside a solid node?
			local nod = minetest.get_node_or_nil(pos)
			if not nod or not nod.name or not minetest.registered_nodes[nod.name]
			or minetest.registered_nodes[nod.name].walkable == true then return end
			pos.y = pos.y + 1
			nod = minetest.get_node_or_nil(pos)
			if not nod or not nod.name or not minetest.registered_nodes[nod.name]
			or minetest.registered_nodes[nod.name].walkable == true then return end

			if minetest.setting_getbool("display_mob_spawn") then
				minetest.chat_send_all("[mobs] Add "..name.." at "..minetest.pos_to_string(pos))
			end

			-- spawn mob half block higher
			pos.y = pos.y - 0.5
			minetest.add_entity(pos, name)
			--print ("Spawned "..name.." at "..minetest.pos_to_string(pos).." on "..node.name.." near "..neighbors[1])

		end
	})
end

-- compatibility with older mob registration
function mobs:register_spawn(name, nodes, max_light, min_light, chance, active_object_count, max_height)
	mobs:spawn_specific(name, nodes, {"air"}, min_light, max_light, 30, chance, active_object_count, -31000, max_height)
end

-- particle effects
function effect(pos, amount, texture, max_size)
	minetest.add_particlespawner({
		amount = amount,
		time = 0.25,
		minpos = pos,
		maxpos = pos,
		minvel = {x=-0, y=-2, z=-0},
		maxvel = {x=2,  y=2,  z=2},
		minacc = {x=-4, y=-4, z=-4},
		maxacc = {x=4, y=4, z=4},
		minexptime = 0.1,
		maxexptime = 1,
		minsize = 0.5,
		maxsize = (max_size or 1),
		texture = texture,
	})
end

-- explosion
function mobs:explosion(pos, radius, fire, smoke, sound)
	-- node hit, bursts into flame (cannot blast through obsidian or protection redo mod items)
	if not fire then fire = 0 end
	if not smoke then smoke = 0 end
	local pos = vector.round(pos)
	local radius = 1
	local vm = VoxelManip()
	local minp, maxp = vm:read_from_map(vector.subtract(pos, radius), vector.add(pos, radius))
	local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
	local data = vm:get_data()
	local p = {}
	local c_air = minetest.get_content_id("air")
	local c_ignore = minetest.get_content_id("ignore")
	local c_obsidian = minetest.get_content_id("default:obsidian")
	local c_brick = minetest.get_content_id("default:obsidianbrick")
	local c_chest = minetest.get_content_id("default:chest_locked")
	if sound and sound ~= "" then
		minetest.sound_play(sound, {pos = pos, gain = 1.0, max_hear_distance = 16})
	end
	for z = -radius, radius do
	for y = -radius, radius do
	local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
	for x = -radius, radius do
		p.x = pos.x + x
		p.y = pos.y + y
		p.z = pos.z + z
		if data[vi] ~= c_air and data[vi] ~= c_ignore and data[vi] ~= c_obsidian and data[vi] ~= c_brick and data[vi] ~= c_chest then
			local n = minetest.get_node(p).name
			-- do NOT destroy protection nodes but DO destroy nodes in protected area
			if not n:find("protector:")
			and not minetest.is_protected(p, "") --/MFF (Crabman|06/23/2015) re-added node protected in areas
			and minetest.get_item_group(n, "unbreakable") ~= 1 then
				-- if chest then drop items inside
				if n == "default:chest" then
					local meta = minetest.get_meta(p)
					local inv  = meta:get_inventory()
					for i = 1,32 do
						local m_stack = inv:get_stack("main",i)
						local obj = minetest.add_item(pos,m_stack)
						if obj then
							obj:setvelocity({x=math.random(-2,2), y=7, z=math.random(-2,2)})
						end
					end
				end
				if fire > 0 and (minetest.registered_nodes[n].groups.flammable or math.random(1, 100) <= 30) then
					minetest.set_node(p, {name="fire:basic_flame"})
				else
					minetest.remove_node(p)
				end
				if smoke > 0 then
					effect(p, 2, "tnt_smoke.png", 5)
				end
			end
		end
		vi = vi + 1
	end
	end
	end
end

-- on mob death drop items
function check_for_death(self)
	local hp = self.object:get_hp()
	if hp > 0 then
		if self.sounds.damage ~= nil then
			minetest.sound_play(self.sounds.damage,{object = self.object})
			self.health = hp
		end
		return
	end
	local pos = self.object:getpos()
	pos.y = pos.y + 0.5 -- drop items half a block higher
	self.object:remove()
	local obj = nil
	for _,drop in ipairs(self.drops) do
		if math.random(1, drop.chance) == 1 then
			obj = minetest.add_item(pos, ItemStack(drop.name.." "..math.random(drop.min, drop.max)))
			if obj then
				obj:setvelocity({x=math.random(-1,1), y=5, z=math.random(-1,1)})
			end
		end
	end
	if self.sounds.death ~= nil then
		minetest.sound_play(self.sounds.death,{object = self.object})
	end
	if self.on_die then
		pos.y = pos.y - 0.5
		self.on_die(self, pos)
	end
end

-- from TNT mod
function calc_velocity(pos1, pos2, old_vel, power)
	local vel = vector.direction(pos1, pos2)
	vel = vector.normalize(vel)
	vel = vector.multiply(vel, power)
	local dist = vector.distance(pos1, pos2)
	dist = math.max(dist, 1)
	vel = vector.divide(vel, dist)
	vel = vector.add(vel, old_vel)
	return vel
end

-- modified from TNT mod
function entity_physics(pos, radius, self) --/MFF (Crabman|06/23/2015)add self to use punch function
	radius = radius * 2
	local objs = minetest.get_objects_inside_radius(pos, radius)
	local obj_pos, obj_vel, dist
	for _, obj in pairs(objs) do
		obj_pos = obj:getpos()
		obj_vel = obj:getvelocity()
		--dist = math.max(1, vector.distance(pos, obj_pos))
		if obj_vel ~= nil then
			obj:setvelocity(calc_velocity(pos, obj_pos, obj_vel, radius * 10))
		end
		--local damage = (4 / dist) * radius
		obj:punch(self.object, 1.0,{full_punch_interval=1.0, damage_groups = {fleshy=self.damage} })--/MFF (Crabman|06/23/2015) use punch
		--obj:set_hp(obj:get_hp() - damage)
	end
end

-- register arrow for shoot attack
function mobs:register_arrow(name, def)
	if not name or not def then return end -- errorcheck
	minetest.register_entity(name, {
		physical = false,
		visual = def.visual,
		visual_size = def.visual_size,
		textures = def.textures,
		velocity = def.velocity,
		hit_player = def.hit_player,
		hit_node = def.hit_node,
		hit_mob = def.hit_mob,
		drop = def.drop or false,
		collisionbox = {0,0,0,0,0,0}, -- remove box around arrows

		on_step = function(self, dtime)
			self.timer = (self.timer or 0) + 1
			if self.timer > 150 then self.object:remove() return end
			local engage = 10 - (self.velocity / 2) -- clear entity before arrow becomes active
			local pos = self.object:getpos()
			local node = minetest.get_node(self.object:getpos()).name
			-- hit node you can walk on
			if self.hit_node and node and minetest.registered_nodes[node] and minetest.registered_nodes[node].walkable then
				self.hit_node(self, pos, node)
				if self.drop == true then
					pos.y = pos.y + 1 ; self.lastpos = (self.lastpos or pos)
					minetest.add_item(self.lastpos, self.object:get_luaentity().name)
				end
				self.object:remove()
				return
			end

			if self.hit_player or self.hit_mob then
				for _,player in pairs(minetest.get_objects_inside_radius(pos, 1)) do
					-- hit player
					if self.hit_player and self.timer > engage and player:is_player() then
						self.hit_player(self, player)
						self.object:remove()
						return
					end
					-- hit mob
					if self.hit_mob and self.timer > engage and player:get_luaentity().name ~= self.object:get_luaentity().name
					and player:get_luaentity().name ~= "__builtin:item" then
						self.hit_mob(self, player)
						self.object:remove()
						return
					end
				end
				self.lastpos = pos
			end
		end
	})
end

-- Spawn Egg
function mobs:register_egg(mob, desc, background, addegg)
	local invimg = background
	if addegg == 1 then
		invimg = invimg.."^mobs_chicken_egg.png"
	end
	minetest.register_craftitem(mob, {
		description = desc,
		inventory_image = invimg,
		on_place = function(itemstack, placer, pointed_thing)
			local pos = pointed_thing.above
			if pointed_thing.above and not minetest.is_protected(pos, placer:get_player_name()) then
				pos.y = pos.y + 0.5
				local mob = minetest.add_entity(pos, mob)
				local ent = mob:get_luaentity()
				if ent.type ~= "monster" then
					-- set owner
					ent.owner = placer:get_player_name()
					ent.tamed = true
				end
				itemstack:take_item()
			end
			return itemstack
		end,
	})
end