mirror of
https://github.com/joe7575/tubelib2.git
synced 2024-08-20 13:34:05 +02:00
407 lines
10 KiB
Lua
407 lines
10 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 P = minetest.pos_to_string
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local S = minetest.string_to_pos
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local M = minetest.get_meta
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--
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-- Tubelib2 specific 6D directions (1 = North, 2 = East, 3 = South, 4 = West, 5 = Down, 6 = Up)
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--
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-- All 6D dirs are the view from the node to the outer side
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-- Tubes are based on two node types, "angled" and "straight" tubes.
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--
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-- +-------+
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-- / /| +-------+
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-- +-------+ | / /|
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-- | | | / / |
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-- | | | +-------+ |
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-- | | | | | |
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-- | | | | |/ |
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-- | | + +-------+| +
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-- | |/ | |/
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-- +-------+ +------+
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--
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-- All other nodes are build by means of axis/rotation variants based on param2
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-- (paramtype2 == "facedir").
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local Turn180Deg = {3,4,1,2,6,5}
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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 = {
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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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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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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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-- Return node next to pos in direction 'dir'
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local function get_next_node(pos, dir)
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if dir and Dir6dToVector[dir] then
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local npos = vector.add(pos, Dir6dToVector[dir])
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return npos, get_node_lvm(npos)
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end
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return pos, get_node_lvm(pos)
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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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-- check if node has a connection on the given dir
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function Tube:connected(pos, dir)
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local _, node = get_next_node(pos, dir)
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return self.primary_node_names[node.name] or self.secondary_node_names[node.name]
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end
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-- The 3 free bits or param2 are used to store the number of connections.
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-- return param2 and tube type
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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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-- return dir1, dir2, num_conn
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function Tube:decode_param2(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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return nil
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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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-- read node
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local npos, node = get_next_node(pos, dir)
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-- tube node with max one connection?
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local _,_,num_conn = self:decode_param2(node.param2)
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if self.primary_node_names[node.name] then
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return npos, num_conn < 2
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end
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return nil
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end
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function Tube:secondary_node(pos, dir)
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-- read node
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local npos, node = get_next_node(pos, dir)
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if self.secondary_node_names[node.name] then
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return npos
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end
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return nil
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end
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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 then -- up?
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return 6
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elseif pitch < -1.1 then -- down?
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return 5
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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, Tube:fdir(placer)
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else
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return nil, Tube:fdir(placer)
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end
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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.allowed_6d_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:tube_data_to_table(pos, dir1, dir2, num_tubes)
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local param2, ttype = self:encode_param2(dir1, dir2, num_tubes)
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return {pos = pos, param2 = param2, type = ttype, num_tubes = num_tubes}
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end
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function Tube:add_tube_dir(pos, dir)
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local npos, node = get_next_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(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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function Tube:del_tube_dir(pos, dir)
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local npos, node = get_next_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(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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function Tube:get_tube_dirs(pos)
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local node = minetest.get_node(pos)
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if self.primary_node_names[node.name] then
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local d1, d2 = self:decode_param2(node.param2)
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return d1, d2
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end
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end
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function Tube:get_next_tube(pos, dir)
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local npos, node = get_next_node(pos, dir)
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local dir1, dir2, num = self:decode_param2(node.param2)
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if self.primary_node_names[node.name] then
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if Turn180Deg[dir] == dir1 then
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return npos, dir2
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else
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return npos, dir1
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end
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end
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end
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function Tube:find_tube_head(pos)
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local cnt = 0
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local dir = nil
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while cnt <= self.max_tube_length do
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local new_pos, new_dir = self:get_next_tube(pos, dir)
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if not new_dir then break end
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pos, dir = new_pos, new_dir
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cnt = cnt + 1
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end
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return pos, dir
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end
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-- Do a correction of param2, delete meta data and
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-- return the new pos, dir
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function Tube:repair_next_tube(pos, dir)
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local npos, node = get_next_node(pos, dir)
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if self.primary_node_names[node.name] then
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local dir1, dir2, num = self:decode_param2(node.param2)
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if num ~= 2 then
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node.param2 = self:encode_param2(dir1, dir2, 2)
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minetest.set_node(npos, node)
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end
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M(npos):from_table(nil)
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if Turn180Deg[dir] == dir1 then
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return npos, dir2
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else
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return npos, dir1
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end
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end
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end
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function Tube:repair_tube_line(pos, dir)
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local cnt = 0
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if not dir then return pos, cnt end
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while cnt <= self.max_tube_length do
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local new_pos, new_dir = self:repair_next_tube(pos, dir)
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if not new_dir then break end
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pos, dir = new_pos, new_dir
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cnt = cnt + 1
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end
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return pos, cnt
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end
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-- update meta data and set number of connections to 1 or 0
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function Tube:update_head_tube(pos1, pos2, num_tubes)
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local _, node = get_next_node(pos1)
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local dir1, dir2, num = self:decode_param2(node.param2)
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num = (self:connected(pos1, dir1) and 1 or 0) + (self:connected(pos1, dir2) and 1 or 0)
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node.param2 = self:encode_param2(dir1, dir2, num)
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minetest.set_node(pos1, node)
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if self.show_infotext then
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M(pos1):set_string("infotext", P(pos2).." / "..num_tubes.." tubes")
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end
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M(pos1):set_string("peer_pos", P(pos2))
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end
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function Tube:add_meta(pos1, pos2, num_tubes)
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self:update_head_tube(pos1, pos2, num_tubes)
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self:update_head_tube(pos2, pos1, num_tubes)
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end
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