builtin/game/item_entity.lua

   1 -- Minetest: builtin/item_entity.lua
   2
   3 function core.spawn_item(pos, item)
   4         -- Take item in any format
   5         local stack = ItemStack(item)
   6         local obj = core.add_entity(pos, "__builtin:item")
   7         -- Don't use obj if it couldn't be added to the map.
   8         if obj then
   9                 obj:get_luaentity():set_item(stack:to_string())
  10         end
  11         return obj
  12 end
  13
  14 -- If item_entity_ttl is not set, enity will have default life time
  15 -- Setting it to -1 disables the feature
  16
  17 local time_to_live = tonumber(core.setting_get("item_entity_ttl"))
  18 if not time_to_live then
  19         time_to_live = 900
  20 end
  21
  22 core.register_entity(":__builtin:item", {
  23         initial_properties = {
  24                 hp_max = 1,
  25                 physical = true,
  26                 collide_with_objects = false,
  27                 collisionbox = {-0.3, -0.3, -0.3, 0.3, 0.3, 0.3},
  28                 visual = "wielditem",
  29                 visual_size = {x = 0.4, y = 0.4},
  30                 textures = {""},
  31                 spritediv = {x = 1, y = 1},
  32                 initial_sprite_basepos = {x = 0, y = 0},
  33                 is_visible = false,
  34         },
  35
  36         itemstring = '',
  37         physical_state = true,
  38         age = 0,
  39
  40         set_item = function(self, itemstring)
  41                 self.itemstring = itemstring
  42                 local stack = ItemStack(itemstring)
  43                 local count = stack:get_count()
  44                 local max_count = stack:get_stack_max()
  45                 if count > max_count then
  46                         count = max_count
  47                         self.itemstring = stack:get_name().." "..max_count
  48                 end
  49                 local s = 0.2 + 0.1 * (count / max_count)
  50                 local c = s
  51                 local itemtable = stack:to_table()
  52                 local itemname = nil
  53                 if itemtable then
  54                         itemname = stack:to_table().name
  55                 end
  56                 local item_texture = nil
  57                 local item_type = ""
  58                 if core.registered_items[itemname] then
  59                         item_texture = core.registered_items[itemname].inventory_image
  60                         item_type = core.registered_items[itemname].type
  61                 end
  62                 local prop = {
  63                         is_visible = true,
  64                         visual = "wielditem",
  65                         textures = {itemname},
  66                         visual_size = {x = s, y = s},
  67                         collisionbox = {-c, -c, -c, c, c, c},
  68                         automatic_rotate = math.pi * 0.5,
  69                 }
  70                 self.object:set_properties(prop)
  71         end,
  72
  73         get_staticdata = function(self)
  74                 return core.serialize({
  75                         itemstring = self.itemstring,
  76                         always_collect = self.always_collect,
  77                         age = self.age,
  78                         dropped_by = self.dropped_by
  79                 })
  80         end,
  81
  82         on_activate = function(self, staticdata, dtime_s)
  83                 if string.sub(staticdata, 1, string.len("return")) == "return" then
  84                         local data = core.deserialize(staticdata)
  85                         if data and type(data) == "table" then
  86                                 self.itemstring = data.itemstring
  87                                 self.always_collect = data.always_collect
  88                                 if data.age then
  89                                         self.age = data.age + dtime_s
  90                                 else
  91                                         self.age = dtime_s
  92                                 end
  93                                 self.dropped_by = data.dropped_by
  94                         end
  95                 else
  96                         self.itemstring = staticdata
  97                 end
  98                 self.object:set_armor_groups({immortal = 1})
  99                 self.object:setvelocity({x = 0, y = 2, z = 0})
 100                 self.object:setacceleration({x = 0, y = -10, z = 0})
 101                 self:set_item(self.itemstring)
 102         end,
 103
 104         try_merge_with = function(self, own_stack, object, obj)
 105                 local stack = ItemStack(obj.itemstring)
 106                 if own_stack:get_name() == stack:get_name() and stack:get_free_space() > 0 then
 107                         local overflow = false
 108                         local count = stack:get_count() + own_stack:get_count()
 109                         local max_count = stack:get_stack_max()
 110                         if count > max_count then
 111                                 overflow = true
 112                                 count = count - max_count
 113                         else
 114                                 self.itemstring = ''
 115                         end
 116                         local pos = object:getpos()
 117                         pos.y = pos.y + (count - stack:get_count()) / max_count * 0.15
 118                         object:moveto(pos, false)
 119                         local s, c
 120                         local max_count = stack:get_stack_max()
 121                         local name = stack:get_name()
 122                         if not overflow then
 123                                 obj.itemstring = name .. " " .. count
 124                                 s = 0.2 + 0.1 * (count / max_count)
 125                                 c = s
 126                                 object:set_properties({
 127                                         visual_size = {x = s, y = s},
 128                                         collisionbox = {-c, -c, -c, c, c, c}
 129                                 })
 130                                 self.object:remove()
 131                                 -- merging succeeded
 132                                 return true
 133                         else
 134                                 s = 0.4
 135                                 c = 0.3
 136                                 object:set_properties({
 137                                         visual_size = {x = s, y = s},
 138                                         collisionbox = {-c, -c, -c, c, c, c}
 139                                 })
 140                                 obj.itemstring = name .. " " .. max_count
 141                                 s = 0.2 + 0.1 * (count / max_count)
 142                                 c = s
 143                                 self.object:set_properties({
 144                                         visual_size = {x = s, y = s},
 145                                         collisionbox = {-c, -c, -c, c, c, c}
 146                                 })
 147                                 self.itemstring = name .. " " .. count
 148                         end
 149                 end
 150                 -- merging didn't succeed
 151                 return false
 152         end,
 153
 154         on_step = function(self, dtime)
 155                 self.age = self.age + dtime
 156                 if time_to_live > 0 and self.age > time_to_live then
 157                         self.itemstring = ''
 158                         self.object:remove()
 159                         return
 160                 end
 161                 local p = self.object:getpos()
 162                 p.y = p.y - 0.5
 163                 local node = core.get_node_or_nil(p)
 164                 local in_unloaded = (node == nil)
 165                 if in_unloaded then
 166                         -- Don't infinetly fall into unloaded map
 167                         self.object:setvelocity({x = 0, y = 0, z = 0})
 168                         self.object:setacceleration({x = 0, y = 0, z = 0})
 169                         self.physical_state = false
 170                         self.object:set_properties({physical = false})
 171                         return
 172                 end
 173                 local nn = node.name
 174                 -- If node is not registered or node is walkably solid and resting on nodebox
 175                 local v = self.object:getvelocity()
 176                 if not core.registered_nodes[nn] or core.registered_nodes[nn].walkable and v.y == 0 then
 177                         if self.physical_state then
 178                                 local own_stack = ItemStack(self.object:get_luaentity().itemstring)
 179                                 -- Merge with close entities of the same item
 180                                 for _, object in ipairs(core.get_objects_inside_radius(p, 0.8)) do
 181                                         local obj = object:get_luaentity()
 182                                         if obj and obj.name == "__builtin:item"
 183                                                         and obj.physical_state == false then
 184                                                 if self:try_merge_with(own_stack, object, obj) then
 185                                                         return
 186                                                 end
 187                                         end
 188                                 end
 189                                 self.object:setvelocity({x = 0, y = 0, z = 0})
 190                                 self.object:setacceleration({x = 0, y = 0, z = 0})
 191                                 self.physical_state = false
 192                                 self.object:set_properties({physical = false})
 193                         end
 194                 else
 195                         if not self.physical_state then
 196                                 self.object:setvelocity({x = 0, y = 0, z = 0})
 197                                 self.object:setacceleration({x = 0, y = -10, z = 0})
 198                                 self.physical_state = true
 199                                 self.object:set_properties({physical = true})
 200                         end
 201                 end
 202         end,
 203
 204         on_punch = function(self, hitter)
 205                 local inv = hitter:get_inventory()
 206                 if inv and self.itemstring ~= '' then
 207                         local left = inv:add_item("main", self.itemstring)
 208                         if left and not left:is_empty() then
 209                                 self.itemstring = left:to_string()
 210                                 return
 211                         end
 212                 end
 213                 self.itemstring = ''
 214                 self.object:remove()
 215         end,
 216 })