tubelib2/internal2.lua

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2018-10-05 21:55:40 +02:00
--[[
Tube Library 2
==============
Copyright (C) 2018 Joachim Stolberg
LGPLv2.1+
See LICENSE.txt for more information
internal.lua
]]--
-- 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
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
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local Dir6dToVector = {[0] =
{x=0, y=0, z=0},
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{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},
}
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tubelib2.Dir6dToVector = Dir6dToVector
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local VectorToDir6d = {
[{x=0, y=0, z=1}] = 1,
[{x=1, y=0, z=0}] = 2,
[{x=0, y=0, z=-1}] = 3,
[{x=-1, y=0, z=0}] = 4,
[{x=0, y=-1, z=0}] = 5,
[{x=0, y=1, z=0}] = 6,
}
--
-- Local Functions
--
local function Tbl(list)
local tbl = {}
for _,item in ipairs(list) do
tbl[item] = true
end
return tbl
end
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-- Return val in the range of min and max
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local function range(val, min, max)
if val > max then return max end
if val < min then return min end
return val
end
local function 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})
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
end
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--
-- Tubelib2 Methods
--
local Tube = tubelib2.Tube
function Tube:fdir(player)
local pitch = player:get_look_pitch()
if pitch > 1.1 and self.valid_dirs[6] then -- up?
return 6
elseif pitch < -1.1 and self.valid_dirs[5] then -- down?
return 5
elseif not self.valid_dirs[1] then
return 6
else
return minetest.dir_to_facedir(player:get_look_dir()) + 1
end
end
function Tube:get_player_data(placer, pointed_thing)
if placer and pointed_thing and pointed_thing.type == "node" then
if placer:get_player_control().sneak then
return pointed_thing.under, self:fdir(placer)
else
return nil, self:fdir(placer)
end
end
end
-- Return param2 and tube type ("A"/"S")
function Tube:encode_param2(dir1, dir2, num_conn)
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
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-- Check if node has a connection on the given dir
function Tube:connected(pos, dir)
local npos = vector.add(pos, Dir6dToVector[dir or 0])
local node = get_node_lvm(npos)
return self.primary_node_names[node.name]
or self.secondary_node_names[node.name]
end
-- Determine dirs via surrounding nodes
function Tube:determine_dir1_dir2_and_num_conn(pos)
local dirs = {}
for dir = 1, 6 do
if self:connected(pos, dir) then
dirs[#dirs+1] = dir
end
end
if #dirs == 1 then
return dirs[1], nil, 1
elseif #dirs == 2 then
return dirs[1], dirs[2], 2
end
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]
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
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-- determine dirs via surrounding nodes
return self:determine_dir1_dir2_and_num_conn(pos)
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end
-- No connection to both sides
function Tube:first_placed_node(pos, param2)
return math.floor(param2 / 32) == 0
end
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-- Return node next to pos in direction 'dir'
function Tube:get_node(pos, dir)
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local npos = vector.add(pos, Dir6dToVector[dir or 0])
return npos, get_node_lvm(npos)
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)
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
end
-- Check all 6 possible positions for known nodes considering preferred_pos
-- 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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-- 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
-- Check for secondary nodes (chests and so on)
for dir = 1,6 do
if allowed[dir] then
local npos = self:secondary_node(pos, dir)
if npos then
if preferred_pos and vector.equals(npos, preferred_pos) then
preferred_pos = nil
table.insert(tbl, 2, dir)
else
table.insert(tbl, dir)
end
end
end
end
-- player pointed to an unknown node to force the tube orientation?
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
-- 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
local num_tubes = (self:connected(pos, tbl[1]) and 1 or 0) +
(self:connected(pos, tbl[2]) and 1 or 0)
return tbl[1], tbl[2], math.min(2, num_tubes)
end
end
function Tube:determine_next_node(pos, dir)
local npos, node = self:get_node(pos, dir)
if self.primary_node_names[node.name] then
-- determine dirs on two ways
local da1,da2,numa = self:decode_param2(npos, node.param2)
local db1,db2,numb = self:determine_dir1_dir2_and_num_conn(npos)
-- both identical?
if da1 == db1 and da2 == db2 then
return npos, da1, da2
end
-- test if stored dirs point to valid nodes
if self:connected(npos, da1) and self:connected(npos, da2) then
return npos, da1, da2
end
-- use and store the determined dirs
if db1 and db2 then
node.param2 = self:encode_param2(db1,db2,numb)
minetest.set_node(npos, node)
return npos, db1, db2
end
return npos, da1, da2
end
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)
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
-- and return the new data to be able to update the node:
-- new_pos, dir1, dir2, num_connections (1, 2)
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function Tube:add_tube_dir(pos, dir)
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?
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, math.min(num + 1, 2)
end
end
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-- Decrement the number of tube connections
-- and return the new data to be able to update the node:
-- new_pos, dir1, dir2, num_connections (0, 1)
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function Tube:del_tube_dir(pos, dir)
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)
end
end
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-- Pairing helper function
function Tube:store_teleport_data(pos, peer_pos)
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", "Connected with "..S(peer_pos))
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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)
local npos = vector.add(pos, Dir6dToVector[dir or 0])
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
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end
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end
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function Tube:remove_tube(pos, sound)
local node = get_node_lvm(pos)
if self.primary_node_names[node.name] then
minetest.sound_play({
name=sound},{
gain=1,
max_hear_distance=5,
loop=false})
minetest.remove_node(pos)
return node, {}
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end
end