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                 infotext = "",
  35         },
  36
  37         itemstring = '',
  38         physical_state = true,
  39         age = 0,
  40
  41         set_item = function(self, itemstring)
  42                 self.itemstring = itemstring
  43                 local stack = ItemStack(itemstring)
  44                 local count = stack:get_count()
  45                 local max_count = stack:get_stack_max()
  46                 if count > max_count then
  47                         count = max_count
  48                         self.itemstring = stack:get_name().." "..max_count
  49                 end
  50                 local s = 0.2 + 0.1 * (count / max_count)
  51                 local c = s
  52                 local itemtable = stack:to_table()
  53                 local itemname = nil
  54                 local description = ""
  55                 if itemtable then
  56                         itemname = stack:to_table().name
  57                 end
  58                 local item_texture = nil
  59                 local item_type = ""
  60                 if core.registered_items[itemname] then
  61                         item_texture = core.registered_items[itemname].inventory_image
  62                         item_type = core.registered_items[itemname].type
  63                         description = core.registered_items[itemname].description
  64                 end
  65                 local prop = {
  66                         is_visible = true,
  67                         visual = "wielditem",
  68                         textures = {itemname},
  69                         visual_size = {x = s, y = s},
  70                         collisionbox = {-c, -c, -c, c, c, c},
  71                         automatic_rotate = math.pi * 0.5,
  72                         infotext = description,
  73                 }
  74                 self.object:set_properties(prop)
  75         end,
  76
  77         get_staticdata = function(self)
  78                 return core.serialize({
  79                         itemstring = self.itemstring,
  80                         always_collect = self.always_collect,
  81                         age = self.age,
  82                         dropped_by = self.dropped_by
  83                 })
  84         end,
  85
  86         on_activate = function(self, staticdata, dtime_s)
  87                 if string.sub(staticdata, 1, string.len("return")) == "return" then
  88                         local data = core.deserialize(staticdata)
  89                         if data and type(data) == "table" then
  90                                 self.itemstring = data.itemstring
  91                                 self.always_collect = data.always_collect
  92                                 if data.age then
  93                                         self.age = data.age + dtime_s
  94                                 else
  95                                         self.age = dtime_s
  96                                 end
  97                                 self.dropped_by = data.dropped_by
  98                         end
  99                 else
 100                         self.itemstring = staticdata
 101                 end
 102                 self.object:set_armor_groups({immortal = 1})
 103                 self.object:setvelocity({x = 0, y = 2, z = 0})
 104                 self.object:setacceleration({x = 0, y = -10, z = 0})
 105                 self:set_item(self.itemstring)
 106         end,
 107
 108         try_merge_with = function(self, own_stack, object, obj)
 109                 local stack = ItemStack(obj.itemstring)
 110                 if own_stack:get_name() == stack:get_name() and stack:get_free_space() > 0 then
 111                         local overflow = false
 112                         local count = stack:get_count() + own_stack:get_count()
 113                         local max_count = stack:get_stack_max()
 114                         if count > max_count then
 115                                 overflow = true
 116                                 count = count - max_count
 117                         else
 118                                 self.itemstring = ''
 119                         end
 120                         local pos = object:getpos()
 121                         pos.y = pos.y + (count - stack:get_count()) / max_count * 0.15
 122                         object:moveto(pos, false)
 123                         local s, c
 124                         local max_count = stack:get_stack_max()
 125                         local name = stack:get_name()
 126                         if not overflow then
 127                                 obj.itemstring = name .. " " .. count
 128                                 s = 0.2 + 0.1 * (count / max_count)
 129                                 c = s
 130                                 object:set_properties({
 131                                         visual_size = {x = s, y = s},
 132                                         collisionbox = {-c, -c, -c, c, c, c}
 133                                 })
 134                                 self.object:remove()
 135                                 -- merging succeeded
 136                                 return true
 137                         else
 138                                 s = 0.4
 139                                 c = 0.3
 140                                 object:set_properties({
 141                                         visual_size = {x = s, y = s},
 142                                         collisionbox = {-c, -c, -c, c, c, c}
 143                                 })
 144                                 obj.itemstring = name .. " " .. max_count
 145                                 s = 0.2 + 0.1 * (count / max_count)
 146                                 c = s
 147                                 self.object:set_properties({
 148                                         visual_size = {x = s, y = s},
 149                                         collisionbox = {-c, -c, -c, c, c, c}
 150                                 })
 151                                 self.itemstring = name .. " " .. count
 152                         end
 153                 end
 154                 -- merging didn't succeed
 155                 return false
 156         end,
 157
 158         on_step = function(self, dtime)
 159                 self.age = self.age + dtime
 160                 if time_to_live > 0 and self.age > time_to_live then
 161                         self.itemstring = ''
 162                         self.object:remove()
 163                         return
 164                 end
 165                 local p = self.object:getpos()
 166                 p.y = p.y - 0.5
 167                 local node = core.get_node_or_nil(p)
 168                 local in_unloaded = (node == nil)
 169                 if in_unloaded then
 170                         -- Don't infinetly fall into unloaded map
 171                         self.object:setvelocity({x = 0, y = 0, z = 0})
 172                         self.object:setacceleration({x = 0, y = 0, z = 0})
 173                         self.physical_state = false
 174                         self.object:set_properties({physical = false})
 175                         return
 176                 end
 177                 local nn = node.name
 178                 -- If node is not registered or node is walkably solid and resting on nodebox
 179                 local v = self.object:getvelocity()
 180                 if not core.registered_nodes[nn] or core.registered_nodes[nn].walkable and v.y == 0 then
 181                         if self.physical_state then
 182                                 local own_stack = ItemStack(self.object:get_luaentity().itemstring)
 183                                 -- Merge with close entities of the same item
 184                                 for _, object in ipairs(core.get_objects_inside_radius(p, 0.8)) do
 185                                         local obj = object:get_luaentity()
 186                                         if obj and obj.name == "__builtin:item"
 187                                                         and obj.physical_state == false then
 188                                                 if self:try_merge_with(own_stack, object, obj) then
 189                                                         return
 190                                                 end
 191                                         end
 192                                 end
 193                                 self.object:setvelocity({x = 0, y = 0, z = 0})
 194                                 self.object:setacceleration({x = 0, y = 0, z = 0})
 195                                 self.physical_state = false
 196                                 self.object:set_properties({physical = false})
 197                         end
 198                 else
 199                         if not self.physical_state then
 200                                 self.object:setvelocity({x = 0, y = 0, z = 0})
 201                                 self.object:setacceleration({x = 0, y = -10, z = 0})
 202                                 self.physical_state = true
 203                                 self.object:set_properties({physical = true})
 204                         end
 205                 end
 206         end,
 207
 208         on_punch = function(self, hitter)
 209                 local inv = hitter:get_inventory()
 210                 if inv and self.itemstring ~= '' then
 211                         local left = inv:add_item("main", self.itemstring)
 212                         if left and not left:is_empty() then
 213                                 self.itemstring = left:to_string()
 214                                 return
 215                         end
 216                 end
 217                 self.itemstring = ''
 218                 self.object:remove()
 219         end,
 220 })