MultiCraft_game/files/itemframes/init.lua

local tmp = {}

minetest.register_entity("itemframes:item",{
	hp_max = 1,
	visual = "wielditem",
	visual_size = {x = 0.33, y = 0.33},
	collisionbox = {0, 0, 0, 0, 0, 0},
	physical = false,
	textures = {"air"},

	on_activate = function(self, staticdata)
		if tmp.nodename ~= nil and tmp.texture ~= nil then
			self.nodename = tmp.nodename
			tmp.nodename = nil
			self.texture = tmp.texture
			tmp.texture = nil
		else
			if staticdata ~= nil and staticdata ~= "" then
				local data = staticdata:split(";")
				if data and data[1] and data[2] then
					self.nodename = data[1]
					self.texture = data[2]
				end
			end
		end
		if self.texture ~= nil then
			self.object:set_properties({textures = {self.texture}})
		end
		if self.texture ~= nil and self.nodename ~= nil then
			local entity_pos = vector.round(self.object:get_pos())
			local objs = minetest.get_objects_inside_radius(entity_pos, 0.5)
			for _, obj in ipairs(objs) do
				if obj ~= self.object and
				   obj:get_luaentity() and
				   obj:get_luaentity().name == "itemframes:item" and
				   obj:get_luaentity().nodename == self.nodename and
				   obj:get_properties() and
				   obj:get_properties().textures and
				   obj:get_properties().textures[1] == self.texture then
					minetest.log("action","[itemframes] Removing extra " ..
						self.texture .. " found in " .. self.nodename .. " at " ..
						minetest.pos_to_string(entity_pos))
					self.object:remove()
					break
				end
			end
		end
	end,

	get_staticdata = function(self)
		if self.nodename ~= nil and self.texture ~= nil then
			return self.nodename .. ";" .. self.texture
		end
		return ""
	end
})

local facedir = {}
facedir[2] = {x =  1, y = 0, z =  0}
facedir[3] = {x = -1, y = 0, z =  0}
facedir[4] = {x =  0, y = 0, z =  1}
facedir[5] = {x =  0, y = 0, z = -1}

local remove_item = function(pos, node)
	local objs = nil
	if node.name == "itemframes:frame" then
		objs = minetest.get_objects_inside_radius(pos, 0.5)
	end
	if objs then
		for _, obj in ipairs(objs) do
			if obj and obj:get_luaentity() and obj:get_luaentity().name == "itemframes:item" then
				obj:remove()
			end
		end
	end
end

local update_item = function(pos, node)
	remove_item(pos, node)
	local meta = minetest.get_meta(pos)
	if meta:get_string("item") ~= "" then
		local posad = facedir[node.param2]
		if not posad then return end
		pos.x = pos.x + posad.x * 6.5 / 16
		pos.y = pos.y + posad.y * 6.5 / 16
		pos.z = pos.z + posad.z * 6.5 / 16
		tmp.nodename = node.name
		tmp.texture = ItemStack(meta:get_string("item")):get_name()
		local e = minetest.add_entity(pos, "itemframes:item")
		if node.param2 == 2 or node.param2 == 3 then
			local yaw = math.pi / 2 - node.param2 * math.pi * 2
			e:setyaw(yaw)
		end
	end
end

local drop_item = function(pos, node)
	local meta = minetest.get_meta(pos)
	if meta:get_string("item") ~= "" then
		if node.name == "itemframes:frame" then
			minetest.add_item(pos, meta:get_string("item"))
		end
		meta:set_string("item", "")
	end
	remove_item(pos, node)
end

minetest.register_node("itemframes:frame",{
	description = "Item frame",
	drawtype = "nodebox",
	node_box = {
		type = "wallmounted"
	},
	tiles = {"itemframe_background.png"},
	inventory_image = "itemframe_background.png",
	wield_image = "itemframe_background.png",
	paramtype = "light",
	paramtype2 = "wallmounted",
	sunlight_propagates = true,
	groups = {choppy = 2, dig_immediate = 2, attached_node = 1},
	legacy_wallmounted = false,
	sounds = default.node_sound_wood_defaults(),

	on_place = function(itemstack, placer, pointed_thing)
		if pointed_thing.type == "node" then
			local undery = pointed_thing.under.y
			local posy = pointed_thing.above.y
			if undery > posy then -- Place on celling, not allowed
				return itemstack
			elseif undery < posy then -- Place on bottom, not allowed
				return itemstack
			else
				return minetest.item_place(itemstack, placer, pointed_thing)
			end
		end
	end,

	after_place_node = function(pos, placer, itemstack)
		local meta = minetest.get_meta(pos)
		meta:set_string("owner",placer:get_player_name())
		meta:set_string("infotext","Item frame (owned by " .. placer:get_player_name() .. ")")
	end,

	on_rightclick = function(pos, node, clicker, itemstack)
		if not itemstack then return end
		local meta = minetest.get_meta(pos)
		local name = clicker and clicker:get_player_name()
		if name == meta:get_string("owner") or
				minetest.check_player_privs(name, "protection_bypass") then
			drop_item(pos, node)
			local string = itemstack:take_item()
			meta:set_string("item", string:to_string())
			update_item(pos, node)
		end
		return itemstack
	end,

	on_punch = function(pos, node, puncher)
		local meta = minetest.get_meta(pos)
		local name = puncher and puncher:get_player_name()
		if name == meta:get_string("owner") or
				minetest.check_player_privs(name, "protection_bypass") then
			drop_item(pos, node)
		end
	end,

	can_dig = function(pos,player)
		if not player then return end
		local name = player and player:get_player_name()
		local meta = minetest.get_meta(pos)
		return name == meta:get_string("owner") or
				minetest.check_player_privs(name, "protection_bypass")
	end,

	on_destruct = function(pos)
		local meta = minetest.get_meta(pos)
		local node = minetest.get_node(pos)
		if meta:get_string("item") ~= "" then
			drop_item(pos, node)
		end
	end
})

-- Craft
minetest.register_craft({
	output = "itemframes:frame",
	recipe = {
		{"group:stick", "group:stick", "group:stick"},
		{"group:stick", "default:paper", "group:stick"},
		{"group:stick", "group:stick", "group:stick"}
	}
})