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technic/technic/switching_station.lua

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-- SWITCHING STATION
-- The switching station is the center of all power distribution on an electric network.
-- The station will collect all produced power from producers (PR) and batteries (BA)
-- and distribute it to receivers (RE) and depleted batteries (BA).
--
-- It works like this:
-- All PR,BA,RE nodes are indexed and tagged with the switching station.
-- The tagging is to allow more stations to be built without allowing a cheat
-- with duplicating power.
-- All the RE nodes are queried for their current EU demand. Those which are off
-- would require no or a small standby EU demand, while those which are on would
-- require more.
-- If the total demand is less than the available power they are all updated with the
-- demand number.
-- If any surplus exists from the PR nodes the batteries will be charged evenly with this.
-- If the total demand requires draw on the batteries they will be discharged evenly.
--
-- If the total demand is more than the available power all RE nodes will be shut down.
-- We have a brown-out situation.
--
-- Hence all the power distribution logic resides in this single node.
--
-- Nodes connected to the network will have one or more of these parameters as meta data:
-- <LV|MV|HV>_EU_supply : Exists for PR and BA node types. This is the EU value supplied by the node. Output
-- <LV|MV|HV>_EU_demand : Exists for RE and BA node types. This is the EU value the node requires to run. Output
-- <LV|MV|HV>_EU_input : Exists for RE and BA node types. This is the actual EU value the network can give the node. Input
--
-- The reason the LV|MV|HV type is prepended toe meta data is because some machine could require several supplies to work.
-- This way the supplies are separated per network.
technic.DBG = 1
local dprint = technic.dprint
minetest.register_craft(
{
output = 'technic:switching_station 1',
recipe = {
{'technic:lv_transformer', 'technic:mv_transformer', 'technic:hv_transformer'},
{'technic:lv_transformer', 'technic:mv_transformer', 'technic:hv_transformer'},
{'technic:lv_cable', 'technic:mv_cable', 'technic:hv_cable'},
}
})
minetest.register_node(
"technic:switching_station",
{description = "Switching Station",
tiles = {"technic_water_mill_top_active.png", "technic_water_mill_top_active.png", "technic_water_mill_top_active.png",
"technic_water_mill_top_active.png", "technic_water_mill_top_active.png", "technic_water_mill_top_active.png"},
groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2},
sounds = default.node_sound_wood_defaults(),
drawtype = "nodebox",
paramtype = "light",
is_ground_content = true,
node_box = {
type = "fixed",
fixed = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
},
selection_box = {
type = "fixed",
fixed = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
},
on_construct = function(pos)
local meta = minetest.env:get_meta(pos)
meta:set_string("infotext", "Switching Station")
-- minetest.chat_send_player(puncher:get_player_name(), "Switching station constructed. Punch the station to shut down the network.");
-- meta:set_int("active", 1)
end,
-- on_punch = function(pos, node, puncher)
-- local meta = minetest.env:get_meta(pos)
-- local active = meta:get_int("active")
-- if active == 1 then
-- meta:set_int("active", 0)
-- minetest.chat_send_player(puncher:get_player_name(), "Electrical network shut down. Punch again to turn it on.");
-- else
-- meta:set_int("active", 1)
-- minetest.chat_send_player(puncher:get_player_name(), "Electrical network turned on. Punch again to shut it down.");
-- end
-- end
})
--------------------------------------------------
-- Functions to help the machines on the electrical network
--------------------------------------------------
-- This one provides a timeout for a node in case it was disconnected from the network
-- A node must be touched by the station continuously in order to function
technic.switching_station_timeout_count = function(pos, machine_tier)
local meta = minetest.env:get_meta(pos)
timeout = meta:get_int(machine_tier.."_EU_timeout")
--print("Counting timeout "..timeout)
if timeout == 0 then
--print("OFF")
meta:set_int(machine_tier.."_EU_input", 0)
else
--print("ON")
meta:set_int(machine_tier.."_EU_timeout", timeout-1)
end
end
--------------------------------------------------
-- Functions to traverse the electrical network
--------------------------------------------------
-- Add a wire node to the LV/MV/HV network
local add_new_cable_node = function(nodes,pos)
local i = 1
repeat
if nodes[i]==nil then break end
if pos.x==nodes[i].x and pos.y==nodes[i].y and pos.z==nodes[i].z then return false end
i=i+1
until false
nodes[i] = {x=pos.x, y=pos.y, z=pos.z, visited=1} -- copy position
return true
end
-- Generic function to add found connected nodes to the right classification array
local check_node_subp = function(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos,machines,cablename)
local meta = minetest.env:get_meta(pos)
local name = minetest.env:get_node(pos).name
if meta:get_float(cablename)==1 then
add_new_cable_node(all_nodes,pos)
elseif machines[name] then
--dprint(name.." is a "..machines[name])
if machines[name] == "PR" then
add_new_cable_node(PR_nodes,pos)
elseif machines[name] == "RE" then
add_new_cable_node(RE_nodes,pos)
elseif machines[name] == "BA" then
add_new_cable_node(BA_nodes,pos)
end
if cablename == "cablelike" then
meta:set_int("LV_EU_timeout", 2) -- Touch node
elseif cablename == "mv_cablelike" then
meta:set_int("MV_EU_timeout", 2) -- Touch node
elseif cablename == "hv_cablelike" then
meta:set_int("HV_EU_timeout", 2) -- Touch node
end
end
end
-- Traverse a network given a list of machines and a cable type name
local traverse_network = function(PR_nodes,RE_nodes,BA_nodes,all_nodes, i, machines, cablename)
local pos = {x=all_nodes[i].x, y=all_nodes[i].y, z=all_nodes[i].z} -- copy position
pos.x=pos.x+1
check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
pos.x=pos.x-2
check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
pos.x=pos.x+1
pos.y=pos.y+1
check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
pos.y=pos.y-2
check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
pos.y=pos.y+1
pos.z=pos.z+1
check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
pos.z=pos.z-2
check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
pos.z=pos.z+1
end
----------------------------------------------
-- The action code for the switching station
----------------------------------------------
minetest.register_abm(
{nodenames = {"technic:switching_station"},
interval = 1,
chance = 1,
action = function(pos, node, active_object_count, active_object_count_wider)
local meta = minetest.env:get_meta(pos)
local meta1 = nil
local pos1 = {}
local PR_EU = 0 -- EUs from PR nodes
local BA_PR_EU = 0 -- EUs from BA nodes (discharching)
local BA_RE_EU = 0 -- EUs to BA nodes (charging)
local RE_EU = 0 -- EUs to RE nodes
local network = ""
local all_nodes = {}
local PR_nodes = {}
local BA_nodes = {}
local RE_nodes = {}
-- -- Possible to turn off the entire network
-- if meta:get_int("active") == 0 then
-- for _,pos1 in pairs(RE_nodes) do
-- meta1 = minetest.env:get_meta(pos1)
-- meta1:set_int("EU_input", 0)
-- end
-- for _,pos1 in pairs(BA_nodes) do
-- meta1 = minetest.env:get_meta(pos1)
-- meta1:set_int("EU_input", 0)
-- end
-- return
-- end
-- Which kind of network are we on:
pos1 = {x=pos.x, y=pos.y-1, z=pos.z}
all_nodes[1] = pos1
meta1 = minetest.env:get_meta(pos1)
if meta1:get_float("cablelike") ==1 then
-- LV type
--dprint("LV type")
network = "LV"
local table_index = 1
repeat
traverse_network(PR_nodes,RE_nodes,BA_nodes,all_nodes,table_index, technic.LV_machines, "cablelike")
table_index = table_index + 1
if all_nodes[table_index] == nil then break end
until false
elseif meta1:get_float("mv_cablelike") ==1 then
-- MV type
--dprint("MV type")
network = "MV"
local table_index = 1
repeat
traverse_network(PR_nodes,RE_nodes,BA_nodes,all_nodes,table_index, technic.MV_machines, "mv_cablelike")
table_index = table_index + 1
if all_nodes[table_index] == nil then break end
until false
elseif meta1:get_float("hv_cablelike") ==1 then
-- HV type
--dprint("HV type")
network = "HV"
local table_index = 1
repeat
traverse_network(PR_nodes,RE_nodes,BA_nodes,all_nodes,table_index, technic.HV_machines, "hv_cablelike")
table_index = table_index + 1
if all_nodes[table_index] == nil then break end
until false
else
-- No type :-)
--dprint("Not connected to a network")
meta:set_string("infotext", "Switching Station - no network")
return
end
--dprint("nodes="..table.getn(all_nodes).." PR="..table.getn(PR_nodes).." BA="..table.getn(BA_nodes).." RE="..table.getn(RE_nodes))
-- Strings for the meta data
local eu_demand_str = network.."_EU_demand"
local eu_input_str = network.."_EU_input"
local eu_supply_str = network.."_EU_supply"
local eu_from_fuel_str = network.."_EU_from_fuel"
-- Get all the power from the PR nodes
local PR_eu_supply = 0 -- Total power
for _,pos1 in pairs(PR_nodes) do
meta1 = minetest.env:get_meta(pos1)
PR_eu_supply = PR_eu_supply + meta1:get_int(eu_supply_str)
end
--dprint("Total PR supply:"..PR_eu_supply)
-- Get all the demand from the RE nodes
local RE_eu_demand = 0
for _,pos1 in pairs(RE_nodes) do
meta1 = minetest.env:get_meta(pos1)
RE_eu_demand = RE_eu_demand + meta1:get_int(eu_demand_str)
end
--dprint("Total RE demand:"..RE_eu_demand)
-- Get all the power from the BA nodes
local BA_eu_supply = 0
for _,pos1 in pairs(BA_nodes) do
meta1 = minetest.env:get_meta(pos1)
BA_eu_supply = BA_eu_supply + meta1:get_int(eu_supply_str)
end
--dprint("Total BA supply:"..BA_eu_supply)
-- Get all the demand from the BA nodes
local BA_eu_demand = 0
for _,pos1 in pairs(BA_nodes) do
meta1 = minetest.env:get_meta(pos1)
BA_eu_demand = BA_eu_demand + meta1:get_int(eu_demand_str)
end
--dprint("Total BA demand:"..BA_eu_demand)
meta:set_string("infotext", "Switching Station. PR("..(PR_eu_supply+BA_eu_supply)..") RE("..(RE_eu_demand+BA_eu_demand)..")")
-- If the PR supply is enough for the RE demand supply them all
if PR_eu_supply >= RE_eu_demand then
--dprint("PR_eu_supply"..PR_eu_supply.." >= RE_eu_demand"..RE_eu_demand)
for _,pos1 in pairs(RE_nodes) do
meta1 = minetest.env:get_meta(pos1)
local eu_demand = meta1:get_int(eu_demand_str)
meta1:set_int(eu_input_str, eu_demand)
end
-- We have a surplus, so distribute the rest equally to the BA nodes
-- Let's calculate the factor of the demand
PR_eu_supply = PR_eu_supply - RE_eu_demand
local charge_factor = 0 -- Assume all batteries fully charged
if BA_eu_demand > 0 then
charge_factor = PR_eu_supply / BA_eu_demand
end
for n,pos1 in pairs(BA_nodes) do
meta1 = minetest.env:get_meta(pos1)
local eu_demand = meta1:get_int(eu_demand_str)
meta1:set_int(eu_input_str, math.floor(eu_demand*charge_factor))
--dprint("Charging battery:"..math.floor(eu_demand*charge_factor))
end
-- If still a surplus we can start giving back to the fuel burning generators
-- Only full EU packages are given back. The rest is wasted.
if BA_eu_demand == 0 then
for _,pos1 in pairs(PR_nodes) do
meta1 = minetest.env:get_meta(pos1)
if meta1:get_int(eu_from_fuel_str) == 1 then
local eu_supply = meta1:get_int(eu_supply_str)
if PR_eu_supply < eu_supply then
break
else
-- Set the supply to 0 if we did not require it.
meta1:set_int(eu_supply_str, 0)
PR_eu_supply = PR_eu_supply - eu_supply
end
end
end
end
return
end
-- If the PR supply is not enough for the RE demand we will discharge the batteries too
if PR_eu_supply+BA_eu_supply >= RE_eu_demand then
--dprint("PR_eu_supply "..PR_eu_supply.."+BA_eu_supply "..BA_eu_supply.." >= RE_eu_demand"..RE_eu_demand)
for _,pos1 in pairs(RE_nodes) do
meta1 = minetest.env:get_meta(pos1)
local eu_demand = meta1:get_int(eu_demand_str)
meta1:set_int(eu_input_str, eu_demand)
end
-- We have a deficit, so distribute to the BA nodes
-- Let's calculate the factor of the supply
local charge_factor = 0 -- Assume all batteries depleted
if BA_eu_supply > 0 then
charge_factor = (PR_eu_supply - RE_eu_demand) / BA_eu_supply
end
for n,pos1 in pairs(BA_nodes) do
meta1 = minetest.env:get_meta(pos1)
local eu_supply = meta1:get_int(eu_supply_str)
meta1:set_int(eu_input_str, math.floor(eu_supply*charge_factor))
--dprint("Discharging battery:"..math.floor(eu_supply*charge_factor))
end
return
end
-- If the PR+BA supply is not enough for the RE demand: Shut everything down!
-- Note: another behaviour could also be imagined: provide the average power for all and let the node decide what happens.
-- This is much simpler though: Not enough power for all==no power for all
--print("NO POWER")
for _,pos1 in pairs(RE_nodes) do
meta1 = minetest.env:get_meta(pos1)
meta1:set_int(eu_input_str, 0)
end
end,
})
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