builtin/item_entity.lua

   1 -- Minetest: builtin/item_entity.lua
   2
   3 function minetest.spawn_item(pos, item)
   4         -- Take item in any format
   5         local stack = ItemStack(item)
   6         local obj = minetest.add_entity(pos, "__builtin:item")
   7         obj:get_luaentity():set_item(stack:to_string())
   8         return obj
   9 end
  10
  11 minetest.register_entity("__builtin:item", {
  12         initial_properties = {
  13                 hp_max = 1,
  14                 physical = true,
  15                 collide_with_objects = false,
  16                 collisionbox = {-0.17,-0.17,-0.17, 0.17,0.17,0.17},
  17                 visual = "sprite",
  18                 visual_size = {x=0.5, y=0.5},
  19                 textures = {""},
  20                 spritediv = {x=1, y=1},
  21                 initial_sprite_basepos = {x=0, y=0},
  22                 is_visible = false,
  23         },
  24
  25         itemstring = '',
  26         physical_state = true,
  27
  28         set_item = function(self, itemstring)
  29                 self.itemstring = itemstring
  30                 local stack = ItemStack(itemstring)
  31                 local itemtable = stack:to_table()
  32                 local itemname = nil
  33                 if itemtable then
  34                         itemname = stack:to_table().name
  35                 end
  36                 local item_texture = nil
  37                 local item_type = ""
  38                 if minetest.registered_items[itemname] then
  39                         item_texture = minetest.registered_items[itemname].inventory_image
  40                         item_type = minetest.registered_items[itemname].type
  41                 end
  42                 prop = {
  43                         is_visible = true,
  44                         visual = "sprite",
  45                         textures = {"unknown_item.png"}
  46                 }
  47                 if item_texture and item_texture ~= "" then
  48                         prop.visual = "sprite"
  49                         prop.textures = {item_texture}
  50                         prop.visual_size = {x=0.50, y=0.50}
  51                 else
  52                         prop.visual = "wielditem"
  53                         prop.textures = {itemname}
  54                         prop.visual_size = {x=0.20, y=0.20}
  55                         prop.automatic_rotate = math.pi * 0.25
  56                 end
  57                 self.object:set_properties(prop)
  58         end,
  59
  60         get_staticdata = function(self)
  61                 --return self.itemstring
  62                 return minetest.serialize({
  63                         itemstring = self.itemstring,
  64                         always_collect = self.always_collect,
  65                 })
  66         end,
  67
  68         on_activate = function(self, staticdata)
  69                 if string.sub(staticdata, 1, string.len("return")) == "return" then
  70                         local data = minetest.deserialize(staticdata)
  71                         if data and type(data) == "table" then
  72                                 self.itemstring = data.itemstring
  73                                 self.always_collect = data.always_collect
  74                         end
  75                 else
  76                         self.itemstring = staticdata
  77                 end
  78                 self.object:set_armor_groups({immortal=1})
  79                 self.object:setvelocity({x=0, y=2, z=0})
  80                 self.object:setacceleration({x=0, y=-10, z=0})
  81                 self:set_item(self.itemstring)
  82         end,
  83
  84         on_step = function(self, dtime)
  85                 local p = self.object:getpos()
  86                 p.y = p.y - 0.3
  87                 local nn = minetest.get_node(p).name
  88                 -- If node is not registered or node is walkably solid and resting on nodebox
  89                 local v = self.object:getvelocity()
  90                 if not minetest.registered_nodes[nn] or minetest.registered_nodes[nn].walkable and v.y == 0 then
  91                         if self.physical_state then
  92                                 self.object:setvelocity({x=0,y=0,z=0})
  93                                 self.object:setacceleration({x=0, y=0, z=0})
  94                                 self.physical_state = false
  95                                 self.object:set_properties({
  96                                         physical = false
  97                                 })
  98                         end
  99                 else
 100                         if not self.physical_state then
 101                                 self.object:setvelocity({x=0,y=0,z=0})
 102                                 self.object:setacceleration({x=0, y=-10, z=0})
 103                                 self.physical_state = true
 104                                 self.object:set_properties({
 105                                         physical = true
 106                                 })
 107                         end
 108                 end
 109         end,
 110
 111         on_punch = function(self, hitter)
 112                 if self.itemstring ~= '' then
 113                         local left = hitter:get_inventory():add_item("main", self.itemstring)
 114                         if not left:is_empty() then
 115                                 self.itemstring = left:to_string()
 116                                 return
 117                         end
 118                 end
 119                 self.object:remove()
 120         end,
 121 })
 122