mirror of
https://github.com/joe7575/tubelib2.git
synced 2024-08-20 05:24:05 +02:00
385 lines
9.6 KiB
Lua
385 lines
9.6 KiB
Lua
--[[
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Tube Library 2
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==============
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Copyright (C) 2018 Joachim Stolberg
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LGPLv2.1+
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See LICENSE.txt for more information
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internal.lua
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]]--
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-- for lazy programmers
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local S = function(pos) if pos then return minetest.pos_to_string(pos) end end
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local P = minetest.string_to_pos
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local M = minetest.get_meta
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local Turn180Deg = {[0]=0,3,4,1,2,6,5}
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tubelib2.Turn180Deg = Turn180Deg
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-- To calculate param2 based on dir6d information
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local DirToParam2 = {
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-- dir1 / dir2 ==> param2 / type (Angled/Straight)
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[12] = {11, "A"},
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[13] = {12, "S"},
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[14] = {14, "A"},
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[15] = { 8, "A"},
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[16] = {10, "A"},
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[23] = { 7, "A"},
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[24] = {21, "S"},
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[25] = { 3, "A"},
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[26] = {19, "A"},
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[34] = { 5, "A"},
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[35] = { 0, "A"},
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[36] = {20, "A"},
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[45] = {15, "A"},
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[46] = {13, "A"},
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[56] = { 4, "S"},
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}
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-- To retrieve dir6d values from the nodes param2
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local Param2ToDir = {}
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for k,item in pairs(DirToParam2) do
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Param2ToDir[item[1]] = k
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end
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-- For neighbour position calculation
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local Dir6dToVector = {[0] =
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{x=0, y=0, z=0},
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{x=0, y=0, z=1},
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{x=1, y=0, z=0},
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{x=0, y=0, z=-1},
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{x=-1, y=0, z=0},
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{x=0, y=-1, z=0},
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{x=0, y=1, z=0},
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}
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tubelib2.Dir6dToVector = Dir6dToVector
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local VectorToDir6d = {
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[{x=0, y=0, z=1}] = 1,
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[{x=1, y=0, z=0}] = 2,
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[{x=0, y=0, z=-1}] = 3,
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[{x=-1, y=0, z=0}] = 4,
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[{x=0, y=-1, z=0}] = 5,
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[{x=0, y=1, z=0}] = 6,
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}
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--
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-- Local Functions
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--
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local function Tbl(list)
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local tbl = {}
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for _,item in ipairs(list) do
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tbl[item] = true
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end
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return tbl
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end
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-- Return val in the range of min and max
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local function range(val, min, max)
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if val > max then return max end
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if val < min then return min end
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return val
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end
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local function get_node_lvm(pos)
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local node = minetest.get_node_or_nil(pos)
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if node then
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return node
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end
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local vm = minetest.get_voxel_manip()
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local MinEdge, MaxEdge = vm:read_from_map(pos, pos)
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local data = vm:get_data()
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local param2_data = vm:get_param2_data()
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local area = VoxelArea:new({MinEdge = MinEdge, MaxEdge = MaxEdge})
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local idx = area:index(pos.x, pos.y, pos.z)
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node = {
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name = minetest.get_name_from_content_id(data[idx]),
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param2 = param2_data[idx]
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}
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return node
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end
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--
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-- Tubelib2 Methods
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--
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local Tube = tubelib2.Tube
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function Tube:fdir(player)
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local pitch = player:get_look_pitch()
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if pitch > 1.1 and self.valid_dirs[6] then -- up?
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return 6
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elseif pitch < -1.1 and self.valid_dirs[5] then -- down?
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return 5
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elseif not self.valid_dirs[1] then
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return 6
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else
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return minetest.dir_to_facedir(player:get_look_dir()) + 1
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end
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end
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function Tube:get_player_data(placer, pointed_thing)
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if placer and pointed_thing and pointed_thing.type == "node" then
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if placer:get_player_control().sneak then
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return pointed_thing.under, self:fdir(placer)
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else
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return nil, self:fdir(placer)
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end
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end
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end
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-- Return param2 and tube type ("A"/"S")
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function Tube:encode_param2(dir1, dir2, num_conn)
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if dir1 > dir2 then
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dir1, dir2 = dir2, dir1
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end
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local param2, _type = unpack(DirToParam2[dir1 * 10 + dir2] or {0, "S"})
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return (num_conn * 32) + param2, _type
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end
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-- Check if node has a connection on the given dir
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function Tube:connected(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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local node = get_node_lvm(npos)
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return self.primary_node_names[node.name]
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or self.secondary_node_names[node.name]
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end
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-- Determine dirs via surrounding nodes
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function Tube:determine_dir1_dir2_and_num_conn(pos)
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local dirs = {}
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for dir = 1, 6 do
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if self:connected(pos, dir) then
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dirs[#dirs+1] = dir
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end
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end
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if #dirs == 1 then
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return dirs[1], nil, 1
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elseif #dirs == 2 then
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return dirs[1], dirs[2], 2
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end
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end
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-- Return dir1, dir2, num_conn
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function Tube:decode_param2(pos, param2)
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local val = Param2ToDir[param2 % 32]
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if val then
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local dir1, dir2 = math.floor(val / 10), val % 10
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local num_conn = math.floor(param2 / 32)
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return dir1, dir2, num_conn
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end
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-- determine dirs via surrounding nodes
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return self:determine_dir1_dir2_and_num_conn(pos)
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end
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-- No connection to both sides
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function Tube:first_placed_node(pos, param2)
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return math.floor(param2 / 32) == 0
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end
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-- Return node next to pos in direction 'dir'
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function Tube:get_node(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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return npos, get_node_lvm(npos)
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end
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-- Return pos for a primary_node and true if num_conn < 2, else false
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function Tube:friendly_primary_node(pos, dir)
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local npos, node = self:get_node(pos, dir)
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if self.primary_node_names[node.name] then
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local _,_,num_conn = self:decode_param2(npos, node.param2)
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-- tube node with max one connection?
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return npos, (num_conn or 2) < 2
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end
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end
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-- Check all 6 possible positions for known nodes considering preferred_pos
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-- and the players fdir and return dir1, dir2 and the number of tubes to connect to (0..2).
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function Tube:determine_tube_dirs(pos, preferred_pos, fdir)
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local tbl = {}
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local allowed = table.copy(self.valid_dirs)
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-- Check for primary nodes (tubes)
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for dir = 1,6 do
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if allowed[dir] then
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local npos, friendly = self:friendly_primary_node(pos, dir)
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if npos then
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if not friendly then
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allowed[dir] = false
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else
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if preferred_pos and vector.equals(npos, preferred_pos) then
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preferred_pos = nil
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table.insert(tbl, 1, dir)
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else
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table.insert(tbl, dir)
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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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-- If no tube around the pointed pos and player prefers a position,
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-- then the new tube shall point to the player.
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if #tbl == 0 and preferred_pos and fdir and allowed[Turn180Deg[fdir]] then
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tbl[1] = Turn180Deg[fdir]
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-- Already 2 dirs found?
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elseif #tbl >= 2 then
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return tbl[1], tbl[2], 2
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end
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-- Check for secondary nodes (chests and so on)
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for dir = 1,6 do
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if allowed[dir] then
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local npos = self:secondary_node(pos, dir)
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if npos then
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if preferred_pos and vector.equals(npos, preferred_pos) then
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preferred_pos = nil
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table.insert(tbl, 2, dir)
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else
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table.insert(tbl, dir)
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end
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end
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end
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end
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-- player pointed to an unknown node to force the tube orientation?
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if preferred_pos and fdir then
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if tbl[1] == Turn180Deg[fdir] and allowed[fdir] then
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tbl[2] = fdir
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elseif allowed[Turn180Deg[fdir]] then
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tbl[2] = Turn180Deg[fdir]
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end
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end
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-- dir1, dir2 still unknown?
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if fdir then
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if #tbl == 0 and allowed[Turn180Deg[fdir]] then
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tbl[1] = Turn180Deg[fdir]
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end
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if #tbl == 1 and allowed[Turn180Deg[tbl[1]]] then
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tbl[2] = Turn180Deg[tbl[1]]
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elseif #tbl == 1 and tbl[1] ~= Turn180Deg[fdir] and allowed[Turn180Deg[fdir]] then
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tbl[2] = Turn180Deg[fdir]
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end
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end
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if #tbl >= 2 and tbl[1] ~= tbl[2] then
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local num_tubes = (self:connected(pos, tbl[1]) and 1 or 0) +
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(self:connected(pos, tbl[2]) and 1 or 0)
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return tbl[1], tbl[2], math.min(2, num_tubes)
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end
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end
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function Tube:determine_next_node(pos, dir)
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local npos, node = self:get_node(pos, dir)
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if self.primary_node_names[node.name] then
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-- determine dirs on two ways
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local da1,da2,numa = self:decode_param2(npos, node.param2)
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local db1,db2,numb = self:determine_dir1_dir2_and_num_conn(npos)
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-- both identical?
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if da1 == db1 and da2 == db2 then
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return npos, da1, da2
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end
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-- test if stored dirs point to valid nodes
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if self:connected(npos, da1) and self:connected(npos, da2) then
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return npos, da1, da2
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end
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-- use and store the determined dirs
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if db1 and db2 then
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node.param2 = self:encode_param2(db1,db2,numb)
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minetest.set_node(npos, node)
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return npos, db1, db2
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end
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return npos, da1, da2
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end
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end
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-- format and return given data as table
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function Tube:tube_data_to_table(pos, dir1, dir2, num_tubes)
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local param2, tube_type = self:encode_param2(dir1, dir2, num_tubes)
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return pos, param2, tube_type, num_tubes
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end
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-- Determine a tube side without connection, increment the number of connections
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-- and return the new data to be able to update the node:
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-- new_pos, dir1, dir2, num_connections (1, 2)
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function Tube:add_tube_dir(pos, dir)
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local npos, node = self:get_node(pos, dir)
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if self.primary_node_names[node.name] then
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local d1, d2, num = self:decode_param2(npos, node.param2)
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-- not already connected to the new tube?
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dir = Turn180Deg[dir]
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if d1 ~= dir and dir ~= d2 then
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if num == 0 then
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d1 = dir
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elseif num == 1 then
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-- determine, which of d1, d2 has already a connection
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if self:connected(npos, d1) then
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d2 = dir
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else
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d1 = dir
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end
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end
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end
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return npos, d1, d2, math.min(num + 1, 2)
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end
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end
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-- Decrement the number of tube connections
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-- and return the new data to be able to update the node:
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-- new_pos, dir1, dir2, num_connections (0, 1)
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function Tube:del_tube_dir(pos, dir)
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local npos, node = self:get_node(pos, dir)
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if self.primary_node_names[node.name] then
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local d1, d2, num = self:decode_param2(npos, node.param2)
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return npos, d1, d2, math.max(num - 1, 0)
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end
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end
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-- Pairing helper function
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function Tube:store_teleport_data(pos, peer_pos)
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local meta = M(pos)
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meta:set_string("tele_pos", S(peer_pos))
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meta:set_string("channel", nil)
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meta:set_string("formspec", nil)
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meta:set_string("infotext", "Connected with "..S(peer_pos))
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return meta:get_int("tube_dir")
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end
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-- Jump over the teleport nodes to the next tube node
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function Tube:get_next_teleport_node(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
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local meta = M(npos)
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local s = meta:get_string("tele_pos")
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if s ~= "" then
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local tele_pos = P(s)
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local tube_dir = M(tele_pos):get_int("tube_dir")
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if tube_dir ~= 0 then
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return tele_pos, tube_dir
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end
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end
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end
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function Tube:remove_tube(pos, sound)
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local node = get_node_lvm(pos)
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if self.primary_node_names[node.name] then
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minetest.sound_play({
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name=sound},{
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gain=1,
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max_hear_distance=5,
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loop=false})
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minetest.remove_node(pos)
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return node, {}
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end
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end
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