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-- Minetest: builtin/item_entity.lua
function core.spawn_item(pos, item)
-- Take item in any format
local stack = ItemStack(item)
local obj = core.add_entity(pos, "__builtin:item")
-- Don't use obj if it couldn't be added to the map.
if obj then
obj:get_luaentity():set_item(stack:to_string())
end
return obj
end
-- If item_entity_ttl is not set, enity will have default life time
-- Setting it to -1 disables the feature
local time_to_live = tonumber(core.settings:get("item_entity_ttl"))
if not time_to_live then
time_to_live = 900
end
core.register_entity(":__builtin:item", {
initial_properties = {
hp_max = 1,
physical = true,
collide_with_objects = false,
collisionbox = {-0.3, -0.3, -0.3, 0.3, 0.3, 0.3},
visual = "wielditem",
visual_size = {x = 0.4, y = 0.4},
textures = {""},
spritediv = {x = 1, y = 1},
initial_sprite_basepos = {x = 0, y = 0},
is_visible = false,
},
itemstring = '',
physical_state = true,
age = 0,
set_item = function(self, itemstring)
self.itemstring = itemstring
local stack = ItemStack(itemstring)
local count = stack:get_count()
local max_count = stack:get_stack_max()
if count > max_count then
count = max_count
self.itemstring = stack:get_name().." "..max_count
end
local s = 0.2 + 0.1 * (count / max_count)
local c = s
local itemtable = stack:to_table()
local itemname = nil
if itemtable then
itemname = stack:to_table().name
end
-- Backwards compatibility: old clients use the texture
-- to get the type of the item
local item_texture = nil
local item_type = ""
if core.registered_items[itemname] then
item_texture = core.registered_items[itemname].inventory_image
item_type = core.registered_items[itemname].type
end
local prop = {
is_visible = true,
visual = "wielditem",
textures = {itemname},
visual_size = {x = s, y = s},
collisionbox = {-c, -c, -c, c, c, c},
automatic_rotate = math.pi * 0.5,
wield_item = itemstring,
}
self.object:set_properties(prop)
end,
get_staticdata = function(self)
return core.serialize({
itemstring = self.itemstring,
always_collect = self.always_collect,
age = self.age,
dropped_by = self.dropped_by
})
end,
on_activate = function(self, staticdata, dtime_s)
if string.sub(staticdata, 1, string.len("return")) == "return" then
local data = core.deserialize(staticdata)
if data and type(data) == "table" then
self.itemstring = data.itemstring
self.always_collect = data.always_collect
if data.age then
self.age = data.age + dtime_s
else
self.age = dtime_s
end
self.dropped_by = data.dropped_by
end
else
self.itemstring = staticdata
end
self.object:set_armor_groups({immortal = 1})
self.object:set_velocity({x = 0, y = 2, z = 0})
self.object:set_acceleration({x = 0, y = -10, z = 0})
self:set_item(self.itemstring)
end,
-- moves items from this stack to an other stack
try_merge_with = function(self, own_stack, object, obj)
-- other item's stack
local stack = ItemStack(obj.itemstring)
-- only merge if items are the same
if own_stack:get_name() == stack:get_name() and
own_stack:get_meta() == stack:get_meta() and
own_stack:get_wear() == stack:get_wear() and
stack:get_free_space() > 0 then
local overflow = false
local count = stack:get_count() + own_stack:get_count()
local max_count = stack:get_stack_max()
if count > max_count then
overflow = true
stack:set_count(max_count)
count = count - max_count
own_stack:set_count(count)
else
self.itemstring = ''
stack:set_count(count)
end
local pos = object:getpos()
pos.y = pos.y + (count - stack:get_count()) / max_count * 0.15
object:moveto(pos, false)
local s, c
if not overflow then
obj.itemstring = stack:to_string()
s = 0.2 + 0.1 * (count / max_count)
c = s
object:set_properties({
visual_size = {x = s, y = s},
collisionbox = {-c, -c, -c, c, c, c},
wield_item = obj.itemstring
})
self.object:remove()
-- merging succeeded
return true
else
s = 0.4
c = 0.3
obj.itemstring = stack:to_string()
object:set_properties({
visual_size = {x = s, y = s},
collisionbox = {-c, -c, -c, c, c, c},
wield_item = obj.itemstring
})
s = 0.2 + 0.1 * (count / max_count)
c = s
self.itemstring = own_stack:to_string()
self.object:set_properties({
visual_size = {x = s, y = s},
collisionbox = {-c, -c, -c, c, c, c},
wield_item = self.itemstring
})
end
end
-- merging didn't succeed
return false
end,
on_step = function(self, dtime)
self.age = self.age + dtime
if time_to_live > 0 and self.age > time_to_live then
self.itemstring = ''
self.object:remove()
return
end
local p = self.object:getpos()
p.y = p.y - 0.5
local node = core.get_node_or_nil(p)
local in_unloaded = (node == nil)
if in_unloaded then
-- Don't infinetly fall into unloaded map
self.object:set_velocity({x = 0, y = 0, z = 0})
self.object:set_acceleration({x = 0, y = 0, z = 0})
self.physical_state = false
self.object:set_properties({physical = false})
return
end
local nn = node.name
-- If node is not registered or node is walkably solid and resting on nodebox
local v = self.object:getvelocity()
if not core.registered_nodes[nn] or (core.registered_nodes[nn].walkable and
core.get_item_group(nn, "slippery") == 0) and v.y == 0 then
if self.physical_state then
local own_stack = ItemStack(self.object:get_luaentity().itemstring)
-- Merge with close entities of the same item
for _, object in ipairs(core.get_objects_inside_radius(p, 0.8)) do
local obj = object:get_luaentity()
if obj and obj.name == "__builtin:item"
and obj.physical_state == false then
if self:try_merge_with(own_stack, object, obj) then
return
end
end
end
self.object:set_velocity({x = 0, y = 0, z = 0})
self.object:set_acceleration({x = 0, y = 0, z = 0})
self.physical_state = false
self.object:set_properties({physical = false})
end
else
if not self.physical_state then
self.object:set_velocity({x = 0, y = 0, z = 0})
self.object:set_acceleration({x = 0, y = -10, z = 0})
self.physical_state = true
self.object:set_properties({physical = true})
elseif minetest.get_item_group(nn, "slippery") ~= 0 then
if math.abs(v.x) < 0.2 and math.abs(v.z) < 0.2 then
self.object:set_velocity({x = 0, y = 0, z = 0})
self.object:set_acceleration({x = 0, y = 0, z = 0})
self.physical_state = false
self.object:set_properties({
physical = false
})
else
self.object:set_acceleration({x = -v.x, y = -10, z = -v.z})
end
end
end
end,
on_punch = function(self, hitter)
local inv = hitter:get_inventory()
if inv and self.itemstring ~= '' then
local left = inv:add_item("main", self.itemstring)
if left and not left:is_empty() then
self.itemstring = left:to_string()
return
end
end
self.itemstring = ''
self.object:remove()
end,
})
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