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Fix O(n^2) network traversal

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This commit is contained in:
number Zero
2018-01-28 01:44:08 +03:00
committed by Ekdohibs
parent 215de5487b
commit 86fb981b44
1 changed files with 49 additions and 32 deletions
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81
technic/machines/switching_station.lua
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@@ -91,48 +91,57 @@ minetest.register_node("technic:switching_station",{
--------------------------------------------------
-- Functions to traverse the electrical network
--------------------------------------------------
local function flatten(map)
local list = {}
for key, value in pairs(map) do
list[#list + 1] = value
end
return list
end
-- Add a wire node to the LV/MV/HV network
local add_new_cable_node = function(nodes, pos, network_id)
technic.cables[minetest.hash_node_position(pos)] = network_id
-- Ignore if the node has already been added
for i = 1, #nodes do
if pos.x == nodes[i].x and
pos.y == nodes[i].y and
pos.z == nodes[i].z then
return false
end
local function add_network_node(nodes, pos, network_id)
local node_id = minetest.hash_node_position(pos)
technic.cables[node_id] = network_id
if nodes[node_id] then
return false
end
table.insert(nodes, {x=pos.x, y=pos.y, z=pos.z, visited=1})
nodes[node_id] = pos
return true
end
local function add_cable_node(nodes, pos, network_id, queue)
if add_network_node(nodes, pos, network_id) then
queue[#queue + 1] = pos
end
end
-- Generic function to add found connected nodes to the right classification array
local check_node_subp = function(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, pos, machines, tier, sw_pos, from_below, network_id)
local check_node_subp = function(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, pos, machines, tier, sw_pos, from_below, network_id, queue)
technic.get_or_load_node(pos)
local meta = minetest.get_meta(pos)
local name = minetest.get_node(pos).name
if technic.is_tier_cable(name, tier) then
add_new_cable_node(all_nodes, pos,network_id)
add_cable_node(all_nodes, pos,network_id, queue)
elseif machines[name] then
--dprint(name.." is a "..machines[name])
meta:set_string(tier.."_network",minetest.pos_to_string(sw_pos))
if machines[name] == technic.producer then
add_new_cable_node(PR_nodes, pos, network_id)
add_network_node(PR_nodes, pos, network_id)
elseif machines[name] == technic.receiver then
add_new_cable_node(RE_nodes, pos, network_id)
add_network_node(RE_nodes, pos, network_id)
elseif machines[name] == technic.producer_receiver then
add_new_cable_node(PR_nodes, pos, network_id)
add_new_cable_node(RE_nodes, pos, network_id)
add_network_node(PR_nodes, pos, network_id)
add_network_node(RE_nodes, pos, network_id)
elseif machines[name] == "SPECIAL" and
(pos.x ~= sw_pos.x or pos.y ~= sw_pos.y or pos.z ~= sw_pos.z) and
from_below then
-- Another switching station -> disable it
add_new_cable_node(SP_nodes, pos, network_id)
add_network_node(SP_nodes, pos, network_id)
meta:set_int("active", 0)
elseif machines[name] == technic.battery then
add_new_cable_node(BA_nodes, pos, network_id)
add_network_node(BA_nodes, pos, network_id)
end
meta:set_int(tier.."_EU_timeout", 2) -- Touch node
@@ -140,8 +149,7 @@ local check_node_subp = function(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nod
end
-- Traverse a network given a list of machines and a cable type name
local traverse_network = function(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, i, machines, tier, sw_pos, network_id)
local pos = all_nodes[i]
local traverse_network = function(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, pos, machines, tier, sw_pos, network_id, queue)
local positions = {
{x=pos.x+1, y=pos.y, z=pos.z},
{x=pos.x-1, y=pos.y, z=pos.z},
@@ -149,9 +157,8 @@ local traverse_network = function(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_no
{x=pos.x, y=pos.y-1, z=pos.z},
{x=pos.x, y=pos.y, z=pos.z+1},
{x=pos.x, y=pos.y, z=pos.z-1}}
--print("ON")
for i, cur_pos in pairs(positions) do
check_node_subp(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, cur_pos, machines, tier, sw_pos, i == 3, network_id)
check_node_subp(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, cur_pos, machines, tier, sw_pos, i == 3, network_id, queue)
end
end
@@ -163,7 +170,8 @@ local touch_nodes = function(list, tier)
end
local get_network = function(sw_pos, pos1, tier)
local cached = technic.networks[minetest.hash_node_position(pos1)]
local network_id = minetest.hash_node_position(pos1)
local cached = technic.networks[network_id]
if cached and cached.tier == tier then
touch_nodes(cached.PR_nodes, tier)
touch_nodes(cached.BA_nodes, tier)
@@ -175,19 +183,28 @@ local get_network = function(sw_pos, pos1, tier)
end
return cached.PR_nodes, cached.BA_nodes, cached.RE_nodes
end
local i = 1
local PR_nodes = {}
local BA_nodes = {}
local RE_nodes = {}
local SP_nodes = {}
local all_nodes = {pos1}
repeat
traverse_network(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes,
i, technic.machines[tier], tier, sw_pos, minetest.hash_node_position(pos1))
i = i + 1
until all_nodes[i] == nil
technic.networks[minetest.hash_node_position(pos1)] = {tier = tier, PR_nodes = PR_nodes,
RE_nodes = RE_nodes, BA_nodes = BA_nodes, SP_nodes = SP_nodes, all_nodes = all_nodes}
local all_nodes = {}
local queue = {}
add_cable_node(all_nodes, pos1, network_id, queue)
while next(queue) do
local to_visit = {}
for _, pos in ipairs(queue) do
traverse_network(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes,
pos, technic.machines[tier], tier, sw_pos, network_id, to_visit)
end
queue = to_visit
end
PR_nodes = flatten(PR_nodes)
BA_nodes = flatten(BA_nodes)
RE_nodes = flatten(RE_nodes)
SP_nodes = flatten(SP_nodes)
all_nodes = flatten(all_nodes)
technic.networks[network_id] = {tier = tier, all_nodes = all_nodes, SP_nodes = SP_nodes,
PR_nodes = PR_nodes, RE_nodes = RE_nodes, BA_nodes = BA_nodes}
return PR_nodes, BA_nodes, RE_nodes
end