mods/default/item_entity.lua

   1 -- mods/default/item_entity.lua
   2
   3 local builtin_item = minetest.registered_entities["__builtin:item"]
   4
   5 local item = {
   6         set_item = function(self, itemstring)
   7                 builtin_item.set_item(self, itemstring)
   8
   9                 local stack = ItemStack(itemstring)
  10                 local itemdef = minetest.registered_items[stack:get_name()]
  11                 if itemdef and itemdef.groups.flammable ~= 0 then
  12                         self.flammable = itemdef.groups.flammable
  13                 end
  14         end,
  15
  16         burn_up = function(self)
  17                 -- disappear in a smoke puff
  18                 self.object:remove()
  19                 local p = self.object:get_pos()
  20                 minetest.sound_play("default_item_smoke", {
  21                         pos = p,
  22                         max_hear_distance = 8,
  23                 })
  24                 minetest.add_particlespawner({
  25                         amount = 3,
  26                         time = 0.1,
  27                         minpos = {x = p.x - 0.1, y = p.y + 0.1, z = p.z - 0.1 },
  28                         maxpos = {x = p.x + 0.1, y = p.y + 0.2, z = p.z + 0.1 },
  29                         minvel = {x = 0, y = 2.5, z = 0},
  30                         maxvel = {x = 0, y = 2.5, z = 0},
  31                         minacc = {x = -0.15, y = -0.02, z = -0.15},
  32                         maxacc = {x = 0.15, y = -0.01, z = 0.15},
  33                         minexptime = 4,
  34                         maxexptime = 6,
  35                         minsize = 5,
  36                         maxsize = 5,
  37                         collisiondetection = true,
  38                         texture = "default_item_smoke.png"
  39                 })
  40         end,
  41
  42         on_step = function(self, dtime)
  43                 builtin_item.on_step(self, dtime)
  44
  45                 if self.flammable then
  46                         -- flammable, check for igniters
  47                         self.ignite_timer = (self.ignite_timer or 0) + dtime
  48                         if self.ignite_timer > 10 then
  49                                 self.ignite_timer = 0
  50
  51                                 local node = minetest.get_node_or_nil(self.object:get_pos())
  52                                 if not node then
  53                                         return
  54                                 end
  55
  56                                 -- Immediately burn up flammable items in lava
  57                                 if minetest.get_item_group(node.name, "lava") > 0 then
  58                                         self:burn_up()
  59                                 else
  60                                         --  otherwise there'll be a chance based on its igniter value
  61                                         local burn_chance = self.flammable
  62                                                 * minetest.get_item_group(node.name, "igniter")
  63                                         if burn_chance > 0 and math.random(0, burn_chance) ~= 0 then
  64                                                 self:burn_up()
  65                                         end
  66                                 end
  67                         end
  68                 end
  69         end,
  70 }
  71
  72 -- set defined item as new __builtin:item, with the old one as fallback table
  73 setmetatable(item, builtin_item)
  74 minetest.register_entity(":__builtin:item", item)