483 lines
14 KiB
Lua
483 lines
14 KiB
Lua
-- Minetest: builtin/item_entity.lua
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local abs, min, floor, random, pi = math.abs, math.min, math.floor, math.random, math.pi
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local vnormalize = vector.normalize
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function core.spawn_item(pos, item)
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-- Take item in any format
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local stack = ItemStack(item)
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local obj = core.add_entity(pos, "__builtin:item")
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-- Don't use obj if it couldn't be added to the map.
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if obj then
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obj:get_luaentity():set_item(stack:to_string())
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end
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return obj
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end
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-- If item_entity_ttl is not set, enity will have default life time
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-- Setting it to -1 disables the feature
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local time_to_live = tonumber(core.settings:get("item_entity_ttl")) or 600
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local gravity = tonumber(core.settings:get("movement_gravity")) or 9.81
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local collection = core.settings:get_bool("item_collection", true)
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local water_flow = core.settings:get_bool("item_water_flow", true)
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local lava_destroy = core.settings:get_bool("item_lava_destroy", true)
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-- Water flow functions, based on QwertyMine3 (WTFPL), and TenPlus1 (MIT) mods
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local function quick_flow_logic(node, pos_testing, dir)
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local node_testing = core.get_node_or_nil(pos_testing)
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if not node_testing then return 0 end
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local liquid = core.registered_nodes[node_testing.name] and core.registered_nodes[node_testing.name].liquidtype
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if not liquid or liquid ~= "flowing" and liquid ~= "source" then
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return 0
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end
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local sum = node.param2 - node_testing.param2
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return (sum < -6 or (sum < 6 and sum > 0) or sum == 0) and dir or -dir
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end
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local function quick_flow(pos, node)
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local x, z = 0, 0
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x = x + quick_flow_logic(node, {x = pos.x - 1.01, y = pos.y, z = pos.z}, -1)
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x = x + quick_flow_logic(node, {x = pos.x + 1.01, y = pos.y, z = pos.z}, 1)
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z = z + quick_flow_logic(node, {x = pos.x, y = pos.y, z = pos.z - 1.01}, -1)
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z = z + quick_flow_logic(node, {x = pos.x, y = pos.y, z = pos.z + 1.01}, 1)
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return vnormalize({x = x, y = 0, z = z})
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end
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core.register_entity(":__builtin:throwing_item", {
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physical = false,
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visual = "wielditem",
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collisionbox = {0, 0, 0, 0, 0, 0},
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textures = {""},
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visual_size = {x = 0.4, y = 0.4},
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is_visible = false,
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on_activate = function(self, staticdata)
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if staticdata == "expired" then
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self.object:remove()
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end
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end,
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get_staticdata = function()
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return "expired"
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end
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})
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core.register_entity(":__builtin:item", {
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initial_properties = {
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hp_max = 1,
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physical = true,
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collide_with_objects = false,
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collisionbox = {-0.3, -0.3, -0.3, 0.3, 0.3, 0.3},
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visual = "wielditem",
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visual_size = {x = 0.4, y = 0.4},
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textures = {""},
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is_visible = false,
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},
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itemstring = "",
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moving_state = true,
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physical_state = true,
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-- Item expiry
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age = 0,
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-- Pushing item out of solid nodes
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force_out = nil,
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force_out_start = nil,
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set_item = function(self, item)
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local stack = ItemStack(item or self.itemstring)
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self.itemstring = stack:to_string()
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if self.itemstring == "" then
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-- item not yet known
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return
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end
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-- Backwards compatibility: old clients use the texture
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-- to get the type of the item
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local itemname = stack:is_known() and stack:get_name() or "unknown"
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local max_count = stack:get_stack_max()
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local count = min(stack:get_count(), max_count)
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local size = 0.2 + 0.1 * (count / max_count) ^ (1 / 3)
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local def = core.registered_items[itemname]
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local glow = def and def.light_source and
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floor(def.light_source / 2 + 0.5)
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self.object:set_properties({
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is_visible = true,
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visual = "wielditem",
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textures = {itemname},
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visual_size = {x = size, y = size},
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collisionbox = {-size, -size, -size, size, size, size},
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automatic_rotate = pi * 0.5 * 0.15 / size,
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wield_item = self.itemstring,
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glow = glow,
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infotext = core.registered_items[itemname].description
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})
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end,
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get_staticdata = function(self)
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return core.serialize({
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itemstring = self.itemstring,
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age = self.age,
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dropped_by = self.dropped_by
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})
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end,
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on_activate = function(self, staticdata, dtime_s)
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if staticdata:sub(1, 6) == "return" then
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local data = core.deserialize(staticdata)
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if data and type(data) == "table" then
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self.itemstring = data.itemstring
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self.age = (data.age or 0) + dtime_s
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self.dropped_by = data.dropped_by
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end
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else
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self.itemstring = staticdata
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end
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self.object:set_armor_groups({immortal = 1, silent = 1})
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self.object:set_velocity({x = 0, y = 2, z = 0})
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self.object:set_acceleration({x = 0, y = -gravity, z = 0})
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self:set_item()
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end,
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try_merge_with = function(self, own_stack, object, entity)
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if self.age == entity.age then
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-- Can not merge with itself
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return false
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end
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local stack = ItemStack(entity.itemstring)
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local name = stack:get_name()
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if own_stack:get_name() ~= name or
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own_stack:get_meta() ~= stack:get_meta() or
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own_stack:get_wear() ~= stack:get_wear() or
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own_stack:get_free_space() == 0 then
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-- Can not merge different or full stack
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return false
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end
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local count = own_stack:get_count()
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local total_count = stack:get_count() + count
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local max_count = stack:get_stack_max()
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if total_count > max_count then
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return false
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end
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-- Merge the remote stack into this one
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local pos = object:get_pos()
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pos.y = pos.y + ((total_count - count) / max_count) * 0.15
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self.object:move_to(pos)
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self.age = 0 -- Handle as new entity
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own_stack:set_count(total_count)
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self:set_item(own_stack)
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entity.itemstring = ""
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object:remove()
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return true
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end,
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enable_physics = function(self)
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if not self.physical_state then
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self.physical_state = true
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self.object:set_properties({physical = true})
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self.object:set_velocity({x=0, y=0, z=0})
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self.object:set_acceleration({x=0, y=-gravity, z=0})
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end
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end,
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disable_physics = function(self)
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if self.physical_state then
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self.physical_state = false
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self.object:set_properties({physical = false})
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self.object:set_velocity({x=0, y=0, z=0})
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self.object:set_acceleration({x=0, y=0, z=0})
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end
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end,
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on_step = function(self, dtime, moveresult)
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self.age = self.age + dtime
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if time_to_live > 0 and self.age > time_to_live then
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self.itemstring = ""
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self.object:remove()
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return
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end
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local pos = self.object:get_pos()
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local node = core.get_node_or_nil({
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x = pos.x,
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y = pos.y + self.object:get_properties().collisionbox[2] - 0.05,
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z = pos.z
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})
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local node_inside = core.get_node_or_nil(pos)
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-- Delete in 'ignore' nodes
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if node and node.name == "ignore" then
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self.itemstring = ""
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self.object:remove()
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return
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end
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if self.force_out then
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-- This code runs after the entity got a push from the is_stuck code.
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-- It makes sure the entity is entirely outside the solid node
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local c = self.object:get_properties().collisionbox
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local s = self.force_out_start
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local f = self.force_out
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local ok = (f.x > 0 and pos.x + c[1] > s.x + 0.5) or
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(f.y > 0 and pos.y + c[2] > s.y + 0.5) or
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(f.z > 0 and pos.z + c[3] > s.z + 0.5) or
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(f.x < 0 and pos.x + c[4] < s.x - 0.5) or
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(f.z < 0 and pos.z + c[6] < s.z - 0.5)
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if ok then
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-- Item was successfully forced out
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self.force_out = nil
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self:enable_physics()
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return
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end
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end
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if not self.physical_state then
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return -- Don't do anything
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end
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-- assert(moveresult,
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-- "Collision info missing, this is caused by an out-of-date/buggy mod or game")
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if not moveresult then
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self.object:set_velocity({x=0, y=0, z=0})
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return
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end
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if not moveresult.collides then
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-- future TODO: items should probably decelerate in air
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return
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end
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-- Push item out when stuck inside solid node
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local is_stuck = false
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local snode = core.get_node_or_nil(pos)
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if snode then
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local sdef = core.registered_nodes[snode.name] or {}
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is_stuck = (sdef.walkable == nil or sdef.walkable == true)
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and (sdef.collision_box == nil or sdef.collision_box.type == "regular")
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and (sdef.node_box == nil or sdef.node_box.type == "regular")
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end
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if is_stuck then
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local shootdir
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local order = {
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{x=1, y=0, z=0}, {x=-1, y=0, z= 0},
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{x=0, y=0, z=1}, {x= 0, y=0, z=-1},
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}
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-- Check which one of the 4 sides is free
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for o = 1, #order do
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local cnode = core.get_node(vector.add(pos, order[o])).name
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local cdef = core.registered_nodes[cnode] or {}
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if cnode ~= "ignore" and cdef.walkable == false then
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shootdir = order[o]
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break
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end
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end
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-- If none of the 4 sides is free, check upwards
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if not shootdir then
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shootdir = {x=0, y=1, z=0}
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local cnode = core.get_node(vector.add(pos, shootdir)).name
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if cnode == "ignore" then
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shootdir = nil -- Do not push into ignore
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end
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end
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if shootdir then
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-- Set new item moving speed accordingly
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local newv = vector.multiply(shootdir, 3)
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self:disable_physics()
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self.object:set_velocity(newv)
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self.force_out = newv
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self.force_out_start = vector.round(pos)
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return
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end
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end
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node = nil -- ground node we're colliding with
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if moveresult.touching_ground then
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for _, info in ipairs(moveresult.collisions) do
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if info.axis == "y" then
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node = core.get_node(info.node_pos)
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break
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end
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end
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end
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local vel = self.object:get_velocity()
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local def = node and core.registered_nodes[node.name]
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local def_inside = node_inside and core.registered_nodes[node_inside.name]
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-- local is_moving = (def and not def.walkable) or
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-- vel.x ~= 0 or vel.y ~= 0 or vel.z ~= 0
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-- local is_slippery = false
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-- Destroy item when dropped into lava
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if lava_destroy and def_inside
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and def_inside.groups and def_inside.groups.lava then
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core.sound_play("default_cool_lava", {
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pos = pos, max_hear_distance = 10})
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self.object:remove()
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core.add_particlespawner({
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amount = 3,
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time = 0.1,
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minpos = {x = pos.x - 0.1, y = pos.y + 0.1, z = pos.z - 0.1},
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maxpos = {x = pos.x + 0.1, y = pos.y + 0.2, z = pos.z + 0.1},
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minvel = {x = 0, y = 2.5, z = 0},
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maxvel = {x = 0, y = 2.5, z = 0},
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minacc = {x = -0.15, y = -0.02, z = -0.15},
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maxacc = {x = 0.15, y = -0.01, z = 0.15},
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minexptime = 4,
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maxexptime = 6,
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minsize = 2,
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maxsize = 4,
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texture = "item_smoke.png"
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})
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return
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end
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-- Moving items in the water flow (TenPlus1, MIT)
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if water_flow and def_inside and def_inside.liquidtype == "flowing" then
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local vec = quick_flow(pos, node_inside)
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self.object:set_velocity({x = vec.x, y = vel.y, z = vec.z})
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return
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end
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-- Move item inside node to free space (TenPlus1, MIT)
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--[[if not self.stuck and def_inside and def_inside.walkable and
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not def_inside.liquid and node_inside.name ~= "air" and
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def_inside.drawtype == "normal" then
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local npos = core.find_node_near(pos, 1, "air")
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if npos then
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self.object:move_to(npos)
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else
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self.stuck = true
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end
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end]]
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-- Slide on slippery nodes
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local keep_movement = false
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if def then
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local slippery = core.get_item_group(node.name, "slippery")
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if slippery ~= 0 and (abs(vel.x) > 0.1 or abs(vel.z) > 0.1) then
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-- Horizontal deceleration
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local factor = min(4 / (slippery + 4) * dtime, 1)
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self.object:set_velocity({
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x = vel.x * (1 - factor),
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y = 0,
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z = vel.z * (1 - factor)
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})
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keep_movement = true
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end
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end
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if not keep_movement then
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self.object:set_velocity({x=0, y=0, z=0})
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end
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if self.moving_state == keep_movement then
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-- Do not update anything until the moving state changes
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return
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end
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self.moving_state = keep_movement
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-- Only collect items if not moving
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if self.moving_state then
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return
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end
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-- Collect the items around to merge with
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local own_stack = ItemStack(self.itemstring)
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if own_stack:get_free_space() == 0 then
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return
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end
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local objects = core.get_objects_inside_radius(pos, 0.5)
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for k, obj in pairs(objects) do
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local entity = obj:get_luaentity()
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if entity and entity.name == "__builtin:item" then
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if self:try_merge_with(own_stack, obj, entity) then
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own_stack = ItemStack(self.itemstring)
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if own_stack:get_free_space() == 0 then
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return
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end
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end
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end
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end
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end,
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on_punch = function(self, hitter)
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local inv = hitter:get_inventory()
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if inv and self.itemstring ~= "" then
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local left = inv:add_item("main", self.itemstring)
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if left and not left:is_empty() then
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self:set_item(left)
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return
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end
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end
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self.itemstring = ""
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self.object:remove()
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end,
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})
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-- Item Collection
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if collection then
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local function collect_items(player)
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local ppos = player:get_pos()
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ppos.y = ppos.y + 1.3
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if not core.is_valid_pos(ppos) then
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return
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end
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-- Detect
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local objects = core.get_objects_inside_radius(ppos, 2)
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for _, obj in pairs(objects) do
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local entity = obj:get_luaentity()
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if entity and entity.name == "__builtin:item" and
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not entity.collectioner and
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entity.age and entity.age > 0.5 then
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local item = ItemStack(entity.itemstring)
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local inv = player:get_inventory()
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if item:get_name() ~= "" and
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inv and inv:room_for_item("main", item) then
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-- Magnet
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obj:move_to(ppos)
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entity.collectioner = true
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-- Collect
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if entity.collectioner == true then
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core.after(0.05, function()
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core.sound_play("item_drop_pickup", {
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pos = ppos,
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max_hear_distance = 10,
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gain = 0.2,
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pitch = random(60,100)/100
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})
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entity.itemstring = ""
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obj:remove()
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item = inv:add_item("main", item)
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if not item:is_empty() then
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core.item_drop(item, player, ppos)
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end
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end)
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end
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end
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end
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end
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end
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core.register_playerstep(function(dtime, playernames)
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for _, name in pairs(playernames) do
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local player = core.get_player_by_name(name)
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if player and player:is_player() and player:get_hp() > 0 then
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collect_items(player)
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end
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end
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end, core.is_singleplayer()) -- Force step in singlplayer mode only
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end
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