mods/ENTITIES/mobs_mc/3_shared.lua

   1 local pr = PseudoRandom(os.time()*5)
   2
   3 local offsets = {}
   4 for x=-2, 2 do
   5         for z=-2, 2 do
   6                 table.insert(offsets, {x=x, y=0, z=z})
   7         end
   8 end
   9
  10 --[[ Periodically check and teleport mob to owner if not sitting (order ~= "sit") and
  11 the owner is too far away. To be used with do_custom. Note: Optimized for mobs smaller than 1×1×1.
  12 Larger mobs might have space problems after teleportation.
  13
  14 * dist: Minimum required distance from owner to teleport. Default: 12
  15 * teleport_check_interval: Optional. Interval in seconds to check the mob teleportation. Default: 4 ]]
  16 mobs_mc.make_owner_teleport_function = function(dist, teleport_check_interval)
  17         return function(self, dtime)
  18                 -- No teleportation if no owner or if sitting
  19                 if not self.owner or self.order == "sit" then
  20                         return
  21                 end
  22                 if not teleport_check_interval then
  23                         teleport_check_interval = 4
  24                 end
  25                 if not dist then
  26                         dist = 12
  27                 end
  28                 if self._teleport_timer == nil then
  29                         self._teleport_timer = teleport_check_interval
  30                         return
  31                 end
  32                 self._teleport_timer = self._teleport_timer - dtime
  33                 if self._teleport_timer <= 0 then
  34                         self._teleport_timer = teleport_check_interval
  35                         local mob_pos = self.object:getpos()
  36                         local owner = minetest.get_player_by_name(self.owner)
  37                         if not owner then
  38                                 -- No owner found, no teleportation
  39                                 return
  40                         end
  41                         local owner_pos = owner:getpos()
  42                         local dist_from_owner = vector.distance(owner_pos, mob_pos)
  43                         if dist_from_owner > dist then
  44                                 -- Check for nodes below air in a 5×1×5 area around the owner position
  45                                 local check_offsets = table.copy(offsets)
  46                                 -- Attempt to place mob near player. Must be placed on walkable node below a non-walkable one. Place inside that air node.
  47                                 while #check_offsets > 0 do
  48                                         local r = pr:next(1, #check_offsets)
  49                                         local telepos = vector.add(owner_pos, check_offsets[r])
  50                                         local telepos_below = {x=telepos.x, y=telepos.y-1, z=telepos.z}
  51                                         table.remove(check_offsets, r)
  52                                         -- Long story short, spawn on a platform
  53                                         if minetest.registered_nodes[minetest.get_node(telepos).name].walkable == false and
  54                                                         minetest.registered_nodes[minetest.get_node(telepos_below).name].walkable == true then
  55                                                 -- Correct position found! Let's teleport.
  56                                                 self.object:setpos(telepos)
  57                                                 return
  58                                         end
  59                                 end
  60                         end
  61                 end
  62         end
  63 end