minetest-mm/mods/tubelib2/internal2.lua

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--[[
Tube Library 2
==============
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Copyright (C) 2018-2021 Joachim Stolberg
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LGPLv2.1+
See LICENSE.txt for more information
internal.lua
]]--
-- for lazy programmers
local S = function(pos) if pos then return minetest.pos_to_string(pos) end end
local P = minetest.string_to_pos
local M = minetest.get_meta
-- Load support for intllib.
local MP = minetest.get_modpath("tubelib2")
local I,IS = dofile(MP.."/intllib.lua")
local Tube = {}
local Turn180Deg = {[0]=0,3,4,1,2,6,5}
-- To calculate param2 based on dir6d information
local DirToParam2 = {
-- dir1 / dir2 ==> param2 / type (Angled/Straight)
[12] = {11, "A"},
[13] = {12, "S"},
[14] = {14, "A"},
[15] = { 8, "A"},
[16] = {10, "A"},
[23] = { 7, "A"},
[24] = {21, "S"},
[25] = { 3, "A"},
[26] = {19, "A"},
[34] = { 5, "A"},
[35] = { 0, "A"},
[36] = {20, "A"},
[45] = {15, "A"},
[46] = {13, "A"},
[56] = { 4, "S"},
}
-- To retrieve dir6d values from the nodes param2
local Param2ToDir = {}
for k,item in pairs(DirToParam2) do
Param2ToDir[item[1]] = k
end
-- For neighbour position calculation
local Dir6dToVector = {[0] =
{x=0, y=0, z=0},
{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},
}
tubelib2.Tube = Tube
tubelib2.Turn180Deg = Turn180Deg
tubelib2.DirToParam2 = DirToParam2
tubelib2.Param2ToDir = Param2ToDir
tubelib2.Dir6dToVector = Dir6dToVector
--
-- Tubelib2 Methods
--
function Tube:get_node_lvm(pos)
local node = minetest.get_node_or_nil(pos)
if node then
return node
end
local vm = minetest.get_voxel_manip()
local MinEdge, MaxEdge = vm:read_from_map(pos, pos)
local data = vm:get_data()
local param2_data = vm:get_param2_data()
local area = VoxelArea:new({MinEdge = MinEdge, MaxEdge = MaxEdge})
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local idx = area:index(pos.x, pos.y, pos.z)
node = {
name = minetest.get_name_from_content_id(data[idx]),
param2 = param2_data[idx]
}
return node
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end
-- Read param2 from a primary node at the given position.
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-- If dir == nil then node_pos = pos
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-- Function returns param2, new_pos or nil
function Tube:get_primary_node_param2(pos, dir)
local npos = vector.add(pos, Dir6dToVector[dir or 0])
self.node = self:get_node_lvm(npos)
if self.primary_node_names[self.node.name] then
return self.node.param2, npos
end
end
-- Check if node at given position is a tube node
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-- If dir == nil then node_pos = pos
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-- Function returns true/false
function Tube:is_primary_node(pos, dir)
local npos = vector.add(pos, Dir6dToVector[dir or 0])
local node = self:get_node_lvm(npos)
return self.primary_node_names[node.name]
end
-- Get secondary node at given position
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-- If dir == nil then node_pos = pos
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-- Function returns node and new_pos or nil
function Tube:get_secondary_node(pos, dir)
local npos = vector.add(pos, Dir6dToVector[dir or 0])
local node = self:get_node_lvm(npos)
if self.secondary_node_names[node.name] then
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return node, npos
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end
end
-- Get special registered nodes at given position
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-- If dir == nil then node_pos = pos
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-- Function returns node and new_pos or nil
function Tube:get_special_node(pos, dir)
local npos = vector.add(pos, Dir6dToVector[dir or 0])
local node = self:get_node_lvm(npos)
if self.special_node_names[node.name] then
return node, npos
end
end
-- Check if node at given position is a secondary node
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-- If dir == nil then node_pos = pos
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-- Function returns true/false
function Tube:is_secondary_node(pos, dir)
local npos = vector.add(pos, Dir6dToVector[dir or 0])
local node = self:get_node_lvm(npos)
return self.secondary_node_names[node.name]
end
-- Check if node at given position is a special node
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-- If dir == nil then node_pos = pos
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-- Function returns true/false
function Tube:is_special_node(pos, dir)
local npos = vector.add(pos, Dir6dToVector[dir or 0])
local node = self:get_node_lvm(npos)
return self.special_node_names[node.name]
end
-- Check if node has a connection on the given dir
function Tube:connected(pos, dir)
return self:is_primary_node(pos, dir) or self:is_secondary_node(pos, dir)
end
function Tube:get_next_tube(pos, dir)
local param2, npos = self:get_primary_node_param2(pos, dir)
if param2 then
local val = Param2ToDir[param2 % 32] or 0
local dir1, dir2 = math.floor(val / 10), val % 10
local num_conn = math.floor(param2 / 32) or 0
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local odir = Turn180Deg[dir]
if odir == dir1 then
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return npos, dir2, num_conn
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elseif odir == dir2 then
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return npos, dir1, num_conn
end
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return
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end
return self:get_next_teleport_node(pos, dir)
end
-- Return param2 and tube type ("A"/"S")
function Tube:encode_param2(dir1, dir2, num_conn)
if dir1 and dir2 and num_conn then
if dir1 > dir2 then
dir1, dir2 = dir2, dir1
end
local param2, _type = unpack(DirToParam2[dir1 * 10 + dir2] or {0, "S"})
return (num_conn * 32) + param2, _type
end
return 0, "S"
end
-- Return dir1, dir2, num_conn
function Tube:decode_param2(pos, param2)
local val = Param2ToDir[param2 % 32]
if val then
local dir1, dir2 = math.floor(val / 10), val % 10
local num_conn = math.floor(param2 / 32)
return dir1, dir2, num_conn
end
end
function Tube:repair_tube(pos, dir)
local param2, npos = self:get_primary_node_param2(pos, dir)
if param2 then
local dir1, dir2 = self:decode_param2(npos, param2)
local param2, tube_type = self:encode_param2(dir1, dir2, 2)
self.clbk_after_place_tube(npos, param2, tube_type, 2)
end
end
-- Return node next to pos in direction 'dir'
function Tube:get_node(pos, dir)
local npos = vector.add(pos, Dir6dToVector[dir or 0])
return npos, self:get_node_lvm(npos)
end
-- format and return given data as table
function Tube:get_tube_data(pos, dir1, dir2, num_tubes, state)
local param2, tube_type = self:encode_param2(dir1, dir2, num_tubes)
return pos, param2, tube_type, num_tubes, state
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end
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-- Return pos for a primary_node and true if num_conn < 2, else false
function Tube:friendly_primary_node(pos, dir)
local param2, npos = self:get_primary_node_param2(pos, dir)
if param2 then
local _,_,num_conn = self:decode_param2(npos, param2)
-- tube node with max one connection?
return npos, (num_conn or 2) < 2
end
end
function Tube:vector_to_dir(v)
if v.y > 0 then
return 6
elseif v.y < 0 then
return 5
else
return minetest.dir_to_facedir(v) + 1
end
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).
function Tube:determine_tube_dirs(pos, preferred_pos, fdir)
local tbl = {}
local allowed = table.copy(self.valid_dirs)
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-- If the node at players "prefered position" is a tube,
-- then the other side of the new tube shall point to the player.
if preferred_pos then
local _, friendly = self:friendly_primary_node(preferred_pos)
if friendly then
local v = vector.direction(pos, preferred_pos)
local dir1 = self:vector_to_dir(v)
local dir2 = Turn180Deg[fdir]
return dir1, dir2, 1
end
end
-- Check for primary nodes (tubes)
for dir = 1,6 do
if allowed[dir] then
local npos, friendly = self:friendly_primary_node(pos, dir)
if npos then
if not friendly then
allowed[dir] = false
else
if preferred_pos and vector.equals(npos, preferred_pos) then
preferred_pos = nil
table.insert(tbl, 1, dir)
else
table.insert(tbl, dir)
end
end
end
end
end
-- If no tube around the pointed pos and player prefers a position,
-- then the new tube shall point to the player.
if #tbl == 0 and preferred_pos and fdir and allowed[Turn180Deg[fdir]] then
tbl[1] = Turn180Deg[fdir]
-- Already 2 dirs found?
elseif #tbl >= 2 then
return tbl[1], tbl[2], 2
end
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-- Check for secondary nodes (chests and so on)
for dir = 1,6 do
if allowed[dir] then
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local node,npos = self:get_secondary_node(pos, dir)
if npos then
if self:is_valid_dir(node, Turn180Deg[dir]) == false then
allowed[dir] = false
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else
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if preferred_pos and vector.equals(npos, preferred_pos) then
preferred_pos = nil
table.insert(tbl, 2, dir)
else
table.insert(tbl, dir)
end
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end
end
end
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
if tbl[1] == Turn180Deg[fdir] and allowed[fdir] then
tbl[2] = fdir
elseif allowed[Turn180Deg[fdir]] then
tbl[2] = Turn180Deg[fdir]
end
end
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-- dir1, dir2 still unknown?
if fdir then
if #tbl == 0 and allowed[Turn180Deg[fdir]] then
tbl[1] = Turn180Deg[fdir]
end
if #tbl == 1 and allowed[Turn180Deg[tbl[1]]] then
tbl[2] = Turn180Deg[tbl[1]]
elseif #tbl == 1 and tbl[1] ~= Turn180Deg[fdir] and allowed[Turn180Deg[fdir]] then
tbl[2] = Turn180Deg[fdir]
end
end
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)
return tbl[1], tbl[2], math.min(2, num_tubes)
end
end
-- 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)
function Tube:add_tube_dir(pos, dir)
local param2, npos = self:get_primary_node_param2(pos, dir)
if param2 then
local d1, d2, num = self:decode_param2(npos, param2)
if not num then return end
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-- if invalid face, do nothing
if self:is_valid_dir_pos(pos, dir) == false then return end
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-- not already connected to the new tube?
dir = Turn180Deg[dir]
if d1 ~= dir and dir ~= d2 then
if num == 0 then
d1 = dir
elseif num == 1 then
-- determine, which of d1, d2 has already a connection
if self:connected(npos, d1) then
d2 = dir
else
d1 = dir
end
end
end
return npos, d1, d2, num
end
end
-- 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)
function Tube:del_tube_dir(pos, dir)
local param2, npos = self:get_primary_node_param2(pos, dir)
if param2 then
local d1, d2, num = self:decode_param2(npos, param2)
-- check if node is connected to the given pos
dir = Turn180Deg[dir]
if d1 == dir or dir == d2 then
return npos, d1, d2, math.max((num or 1) - 1, 0)
end
end
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)
meta:set_string("tele_pos", S(peer_pos))
meta:set_string("channel", nil)
meta:set_string("formspec", nil)
meta:set_string("infotext", I("Connected with ")..S(peer_pos))
return meta:get_int("tube_dir")
end
-- Jump over the teleport nodes to the next tube node
function Tube:get_next_teleport_node(pos, dir)
if pos then
local npos = vector.add(pos, Dir6dToVector[dir or 0])
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if self:is_valid_dir_pos(npos, Turn180Deg[dir]) == false then
return
end
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local meta = M(npos)
local s = meta:get_string("tele_pos")
if s ~= "" then
local tele_pos = P(s)
local tube_dir = M(tele_pos):get_int("tube_dir")
if tube_dir ~= 0 then
return tele_pos, tube_dir
end
end
end
end
function Tube:dbg_out()
for pos1,item1 in pairs(self.connCache) do
for dir1,item2 in pairs(item1) do
print("pos1="..pos1..", dir1="..dir1..", pos2="..S(item2.pos2)..", dir2="..item2.dir2)
end
end
end
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-- Walk to the end of the tube line and return pos and outdir of both head tube nodes.
-- If no tube is available, return nil
function Tube:walk_tube_line(pos, dir)
local cnt = 0
if dir then
while cnt <= self.max_tube_length do
local new_pos, new_dir, num = self:get_next_tube(pos, dir)
if not new_pos then break end
if cnt > 0 and num ~= 2 and self:is_primary_node(new_pos, new_dir) then
self:repair_tube(new_pos, new_dir)
end
pos, dir = new_pos, new_dir
cnt = cnt + 1
end
if cnt > 0 then
return pos, dir, cnt
end
end
return table.copy(pos), dir, 0
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end