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mirror of https://github.com/moparisthebest/minetest synced 2024-12-22 15:48:48 -05:00
minetest/builtin/game/item_entity.lua
est31 2a7d01b833 Some map border related fixes
1. Check for entity addition success in spawn_item implementation
2. Check for success in item_drop callback, so that the player
doesn't lose the item if they are outside bounds and try to drop it.
3. When existing player joins game, check that their position is inside
map bounds. If not, set their position to the return value of findSpawnPos().
4. Make findSpawnPos() respect the border

2 fixes a lua crash if a player drops an item outside map bounds.
3 fixes an assertion crash if a player leaves when being outside map bounds,
and then rejoins.
2015-09-29 23:06:15 +02:00

214 lines
6.0 KiB
Lua

-- 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.setting_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
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,
}
self.object:set_properties(prop)
end,
get_staticdata = function(self)
return core.serialize({
itemstring = self.itemstring,
always_collect = self.always_collect,
age = self.age
})
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
end
else
self.itemstring = staticdata
end
self.object:set_armor_groups({immortal = 1})
self.object:setvelocity({x = 0, y = 2, z = 0})
self.object:setacceleration({x = 0, y = -10, z = 0})
self:set_item(self.itemstring)
end,
try_merge_with = function(self, own_stack, object, obj)
local stack = ItemStack(obj.itemstring)
if own_stack:get_name() == stack:get_name() 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
count = count - max_count
else
self.itemstring = ''
end
local pos = object:getpos()
pos.y = pos.y + (count - stack:get_count()) / max_count * 0.15
object:moveto(pos, false)
local s, c
local max_count = stack:get_stack_max()
local name = stack:get_name()
if not overflow then
obj.itemstring = name .. " " .. count
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}
})
self.object:remove()
-- merging succeeded
return true
else
s = 0.4
c = 0.3
object:set_properties({
visual_size = {x = s, y = s},
collisionbox = {-c, -c, -c, c, c, c}
})
obj.itemstring = name .. " " .. max_count
s = 0.2 + 0.1 * (count / max_count)
c = s
self.object:set_properties({
visual_size = {x = s, y = s},
collisionbox = {-c, -c, -c, c, c, c}
})
self.itemstring = name .. " " .. count
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:setvelocity({x = 0, y = 0, z = 0})
self.object:setacceleration({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 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:setvelocity({x = 0, y = 0, z = 0})
self.object:setacceleration({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:setvelocity({x = 0, y = 0, z = 0})
self.object:setacceleration({x = 0, y = -10, z = 0})
self.physical_state = true
self.object:set_properties({physical = true})
end
end
end,
on_punch = function(self, hitter)
if self.itemstring ~= '' then
local left = hitter:get_inventory():add_item("main", self.itemstring)
if not left:is_empty() then
self.itemstring = left:to_string()
return
end
end
self.itemstring = ''
self.object:remove()
end,
})