advtrains.git - Advtrains mod for minetest.

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1 files changed, 5 insertions, 0 deletions

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-- Minetest: builtin/item.lua

local function copy_pointed_thing(pointed_thing)
	return {
		type  = pointed_thing.type,
		above = vector.new(pointed_thing.above),
		under = vector.new(pointed_thing.under),
		ref   = pointed_thing.ref,
	}
end

--
-- Item definition helpers
--

function core.inventorycube(img1, img2, img3)
	img2 = img2 or img1
	img3 = img3 or img1
	return "[inventorycube"
			.. "{" .. img1:gsub("%^", "&")
			.. "{" .. img2:gsub("%^", "&")
			.. "{" .. img3:gsub("%^", "&")
end

function core.get_pointed_thing_position(pointed_thing, above)
	if pointed_thing.type == "node" then
		if above then
			-- The position where a node would be placed
			return pointed_thing.above
		end
		-- The position where a node would be dug
		return pointed_thing.under
	elseif pointed_thing.type == "object" then
		return pointed_thing.ref and pointed_thing.ref:getpos()
	end
end

function core.dir_to_facedir(dir, is6d)
	--account for y if requested
	if is6d and math.abs(dir.y) > math.abs(dir.x) and math.abs(dir.y) > math.abs(dir.z) then

		--from above
		if dir.y < 0 then
			if math.abs(dir.x) > math.abs(dir.z) then
				if dir.x < 0 then
					return 19
				else
					return 13
				end
			else
				if dir.z < 0 then
					return 10
				else
					return 4
				end
			end

		--from below
		else
			if math.abs(dir.x) > math.abs(dir.z) then
				if dir.x < 0 then
					return 15
				else
					return 17
				end
			else
				if dir.z < 0 then
					return 6
				else
					return 8
				end
			end
		end

	--otherwise, place horizontally
	elseif math.abs(dir.x) > math.abs(dir.z) then
		if dir.x < 0 then
			return 3
		else
			return 1
		end
	else
		if dir.z < 0 then
			return 2
		else
			return 0
		end
	end
end

-- Table of possible dirs
local facedir_to_dir = {
	{x= 0, y=0,  z= 1},
	{x= 1, y=0,  z= 0},
	{x= 0, y=0,  z=-1},
	{x=-1, y=0,  z= 0},
	{x= 0, y=-1, z= 0},
	{x= 0, y=1,  z= 0},
}
-- Mapping from facedir value to index in facedir_to_dir.
local facedir_to_dir_map = {
	[0]=1, 2, 3, 4,
	5, 2, 6, 4,
	6, 2, 5, 4,
	1, 5, 3, 6,
	1, 6, 3, 5,
	1, 4, 3, 2,
}
function core.facedir_to_dir(facedir)
	return facedir_to_dir[facedir_to_dir_map[facedir]]
end

function core.dir_to_wallmounted(dir)
	if math.abs(dir.y) > math.max(math.abs(dir.x), math.abs(dir.z)) then
		if dir.y < 0 then
			return 1
		else
			return 0
		end
	elseif math.abs(dir.x) > math.abs(dir.z) then
		if dir.x < 0 then
			return 3
		else
			return 2
		end
	else
		if dir.z < 0 then
			return 5
		else
			return 4
		end
	end
end

-- table of dirs in wallmounted order
local wallmounted_to_dir = {
	[0] = {x = 0, y = 1, z = 0},
	{x =  0, y = -1, z =  0},
	{x =  1, y =  0, z =  0},
	{x = -1, y =  0, z =  0},
	{x =  0, y =  0, z =  1},
	{x =  0, y =  0, z = -1},
}
function core.wallmounted_to_dir(wallmounted)
	return wallmounted_to_dir[wallmounted]
end

function core.get_node_drops(nodename, toolname)
	local drop = ItemStack({name=nodename}):get_definition().drop
	if drop == nil then
		-- default drop
		return {nodename}
	elseif type(drop) == "string" then
		-- itemstring drop
		return {drop}
	elseif drop.items == nil then
		-- drop = {} to disable default drop
		return {}
	end

	-- Extended drop table
	local got_items = {}
	local got_count = 0
	local _, item, tool
	for _, item in ipairs(drop.items) do
		local good_rarity = true
		local good_tool = true
		if item.rarity ~= nil then
			good_rarity = item.rarity < 1 or math.random(item.rarity) == 1
		end
		if item.tools ~= nil then
			good_tool = false
			for _, tool in ipairs(item.tools) do
				if tool:sub(1, 1) == '~' then
					good_tool = toolname:find(tool:sub(2)) ~= nil
				else
					good_tool = toolname == tool
				end
				if good_tool then
					break
				end
			end
        	end
		if good_rarity and good_tool then
			got_count = got_count + 1
			for _, add_item in ipairs(item.items) do
				got_items[#got_items+1] = add_item
			end
			if drop.max_items ~= nil and got_count == drop.max_items then
				break
			end
		end
	end
	return got_items
end

function core.item_place_node(itemstack, placer, pointed_thing, param2)
	local item = itemstack:peek_item()
	local def = itemstack:get_definition()
	if def.type ~= "node" or pointed_thing.type ~= "node" then
		return itemstack, false
	end

	local under = pointed_thing.under
	local oldnode_under = core.get_node_or_nil(under)
	local above = pointed_thing.above
	local oldnode_above = core.get_node_or_nil(above)

	if not oldnode_under or not oldnode_above then
		core.log("info", placer:get_player_name() .. " tried to place"
			.. " node in unloaded position " .. core.pos_to_string(above))
		return itemstack, false
	end

	local olddef_under = ItemStack({name=oldnode_under.name}):get_definition()
	olddef_under = olddef_under or core.nodedef_default
	local olddef_above = ItemStack({name=oldnode_above.name}):get_definition()
	olddef_above = olddef_above or core.nodedef_default

	if not olddef_above.buildable_to and not olddef_under.buildable_to then
		core.log("info", placer:get_player_name() .. " tried to place"
			.. " node in invalid position " .. core.pos_to_string(above)
			.. ", replacing " .. oldnode_above.name)
		return itemstack, false
	end

	-- Place above pointed node
	local place_to = {x = above.x, y = above.y, z = above.z}

	-- If node under is buildable_to, place into it instead (eg. snow)
	if olddef_under.buildable_to then
		core.log("info", "node under is buildable to")
		place_to = {x = under.x, y = under.y, z = under.z}
	end

	if core.is_protected(place_to, placer:get_player_name()) and
			not minetest.check_player_privs(placer, "protection_bypass") then
		core.log("action", placer:get_player_name()
				.. " tried to place " .. def.name
				.. " at protected position "
				.. core.pos_to_string(place_to))
		core.record_protection_violation(place_to, placer:get_player_name())
		return itemstack
	end

	core.log("action", placer:get_player_name() .. " places node "
		.. def.name .. " at " .. core.pos_to_string(place_to))

	local oldnode = core.get_node(place_to)
	local newnode = {name = def.name, param1 = 0, param2 = param2}

	-- Calculate direction for wall mounted stuff like torches and signs
	if def.place_param2 ~= nil then
		newnode.param2 = def.place_param2
	elseif def.paramtype2 == 'wallmounted' and not param2 then
		local dir = {
			x = under.x - above.x,
			y = under.y - above.y,


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