-- SWITCHING STATION
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-- The switching station is the center of all power distribution on an electric network.
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-- The station will collect all produced power from producers (PR) and batteries (BA)
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-- and distribute it to receivers (RE) and depleted batteries (BA).
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--
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-- It works like this:
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-- All PR,BA,RE nodes are indexed and tagged with the switching station.
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-- The tagging is to allow more stations to be built without allowing a cheat
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-- with duplicating power.
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-- All the RE nodes are queried for their current EU demand. Those which are off
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-- would require no or a small standby EU demand, while those which are on would
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-- require more.
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-- If the total demand is less than the available power they are all updated with the
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-- demand number.
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-- If any surplus exists from the PR nodes the batteries will be charged evenly with this.
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-- If the total demand requires draw on the batteries they will be discharged evenly.
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--
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-- If the total demand is more than the available power all RE nodes will be shut down.
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-- We have a brown-out situation.
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--
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-- Hence all the power distribution logic resides in this single node.
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--
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-- Nodes connected to the network will have one or more of these parameters as meta data:
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-- <LV|MV|HV>_EU_supply : Exists for PR and BA node types. This is the EU value supplied by the node. Output
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-- <LV|MV|HV>_EU_demand : Exists for RE and BA node types. This is the EU value the node requires to run. Output
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-- <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
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--
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-- The reason the LV|MV|HV type is prepended toe meta data is because some machine could require several supplies to work.
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-- This way the supplies are separated per network.
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technic.networks = {}
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local S = technic.getter
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minetest.register_craft({
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output = "technic:switching_station",
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recipe = {
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{"technic:cast_iron_ingot", "technic:lv_transformer", "technic:cast_iron_ingot"},
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{"default:copper_ingot", "technic:lv_cable0", "default:copper_ingot"},
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{"technic:cast_iron_ingot", "technic:lv_cable0", "technic:cast_iron_ingot"}
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}
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})
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minetest.register_node("technic:switching_station",{
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description = S("Switching Station"),
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tiles = {"technic_water_mill_top_active.png", "technic_water_mill_top_active.png",
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"technic_water_mill_top_active.png", "technic_water_mill_top_active.png",
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"technic_water_mill_top_active.png", "technic_water_mill_top_active.png"},
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groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2},
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sounds = default.node_sound_wood_defaults(),
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drawtype = "nodebox",
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paramtype = "light",
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node_box = {
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type = "fixed",
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fixed = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
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},
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on_construct = function(pos)
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local meta = minetest.get_meta(pos)
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meta:set_string("infotext", S("Switching Station"))
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end,
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})
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--------------------------------------------------
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-- Functions to help the machines on the electrical network
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--------------------------------------------------
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-- This one provides a timeout for a node in case it was disconnected from the network
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-- A node must be touched by the station continuously in order to function
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function technic.switching_station_timeout_count(pos, tier)
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local meta = minetest.get_meta(pos)
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local timeout = meta:get_int(tier.."_EU_timeout")
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if timeout == 0 then
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meta:set_int(tier.."_EU_input", 0)
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else
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meta:set_int(tier.."_EU_timeout", timeout - 1)
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end
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end
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--------------------------------------------------
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-- Functions to traverse the electrical network
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--------------------------------------------------
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-- Add a wire node to the LV/MV/HV network
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local add_new_cable_node = function(nodes, pos)
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-- Ignore if the node has already been added
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for i = 1, #nodes do
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if pos.x == nodes[i].x and
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pos.y == nodes[i].y and
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pos.z == nodes[i].z then
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return false
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end
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end
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table.insert(nodes, {x=pos.x, y=pos.y, z=pos.z, visited=1})
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return true
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end
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-- Generic function to add found connected nodes to the right classification array
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local check_node_subp = function(PR_nodes, RE_nodes, BA_nodes, all_nodes, pos, machines, tier)
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local meta = minetest.get_meta(pos)
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local name = minetest.get_node(pos).name
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if technic.is_tier_cable(name, tier) then
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add_new_cable_node(all_nodes, pos)
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elseif machines[name] then
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--dprint(name.." is a "..machines[name])
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if machines[name] == technic.producer then
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add_new_cable_node(PR_nodes, pos)
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elseif machines[name] == technic.receiver then
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add_new_cable_node(RE_nodes, pos)
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elseif machines[name] == technic.battery then
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add_new_cable_node(BA_nodes, pos)
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end
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meta:set_int(tier.."_EU_timeout", 2) -- Touch node
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end
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end
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-- Traverse a network given a list of machines and a cable type name
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local traverse_network = function(PR_nodes, RE_nodes, BA_nodes, all_nodes, i, machines, tier)
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local pos = all_nodes[i]
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local positions = {
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{x=pos.x+1, y=pos.y, z=pos.z},
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{x=pos.x-1, y=pos.y, z=pos.z},
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{x=pos.x, y=pos.y+1, z=pos.z},
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{x=pos.x, y=pos.y-1, z=pos.z},
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{x=pos.x, y=pos.y, z=pos.z+1},
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{x=pos.x, y=pos.y, z=pos.z-1}}
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--print("ON")
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for i, cur_pos in pairs(positions) do
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check_node_subp(PR_nodes, RE_nodes, BA_nodes, all_nodes, cur_pos, machines, tier)
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end
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end
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local touch_nodes = function(list, tier)
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for _, pos in ipairs(list) do
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local meta = minetest.get_meta(pos)
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meta:set_int(tier.."_EU_timeout", 2) -- Touch node
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end
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end
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local get_network = function(pos1, tier)
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local cached = technic.networks[minetest.hash_node_position(pos1)]
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if cached and cached.tier == tier then
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touch_nodes(cached.PR_nodes, tier)
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touch_nodes(cached.BA_nodes, tier)
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touch_nodes(cached.RE_nodes, tier)
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return cached.PR_nodes, cached.BA_nodes, cached.RE_nodes
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end
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local i = 1
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local PR_nodes = {}
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local BA_nodes = {}
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local RE_nodes = {}
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local all_nodes = {pos1}
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repeat
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traverse_network(PR_nodes, RE_nodes, BA_nodes, all_nodes,
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i, technic.machines[tier], tier)
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i = i + 1
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until all_nodes[i] == nil
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technic.networks[minetest.hash_node_position(pos1)] = {tier = tier, PR_nodes = PR_nodes, RE_nodes = RE_nodes, BA_nodes = BA_nodes}
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return PR_nodes, BA_nodes, RE_nodes
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end
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-----------------------------------------------
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-- The action code for the switching station --
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-----------------------------------------------
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minetest.register_abm({
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nodenames = {"technic:switching_station"},
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interval = 1,
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chance = 1,
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action = function(pos, node, active_object_count, active_object_count_wider)
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local meta = minetest.get_meta(pos)
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local meta1 = nil
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local pos1 = {}
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local PR_EU = 0 -- EUs from PR nodes
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local BA_PR_EU = 0 -- EUs from BA nodes (discharching)
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local BA_RE_EU = 0 -- EUs to BA nodes (charging)
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local RE_EU = 0 -- EUs to RE nodes
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local tier = ""
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local PR_nodes
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local BA_nodes
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local RE_nodes
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local machine_name = S("Switching Station")
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-- Which kind of network are we on:
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pos1 = {x=pos.x, y=pos.y-1, z=pos.z}
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local name = minetest.get_node(pos1).name
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local tier = technic.get_cable_tier(name)
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if tier then
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PR_nodes, BA_nodes, RE_nodes = get_network(pos1, tier)
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else
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--dprint("Not connected to a network")
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meta:set_string("infotext", S("%s Has No Network"):format(machine_name))
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return
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end
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--dprint("nodes="..table.getn(all_nodes)
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-- .." PR="..table.getn(PR_nodes)
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-- .." BA="..table.getn(BA_nodes)
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-- .." RE="..table.getn(RE_nodes))
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-- Strings for the meta data
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local eu_demand_str = tier.."_EU_demand"
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local eu_input_str = tier.."_EU_input"
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local eu_supply_str = tier.."_EU_supply"
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-- Get all the power from the PR nodes
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local PR_eu_supply = 0 -- Total power
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for _, pos1 in pairs(PR_nodes) do
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meta1 = minetest.get_meta(pos1)
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PR_eu_supply = PR_eu_supply + meta1:get_int(eu_supply_str)
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end
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--dprint("Total PR supply:"..PR_eu_supply)
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-- Get all the demand from the RE nodes
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local RE_eu_demand = 0
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for _, pos1 in pairs(RE_nodes) do
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meta1 = minetest.get_meta(pos1)
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RE_eu_demand = RE_eu_demand + meta1:get_int(eu_demand_str)
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end
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--dprint("Total RE demand:"..RE_eu_demand)
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-- Get all the power from the BA nodes
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local BA_eu_supply = 0
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for _, pos1 in pairs(BA_nodes) do
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meta1 = minetest.get_meta(pos1)
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BA_eu_supply = BA_eu_supply + meta1:get_int(eu_supply_str)
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end
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--dprint("Total BA supply:"..BA_eu_supply)
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-- Get all the demand from the BA nodes
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local BA_eu_demand = 0
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for _, pos1 in pairs(BA_nodes) do
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meta1 = minetest.get_meta(pos1)
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BA_eu_demand = BA_eu_demand + meta1:get_int(eu_demand_str)
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end
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--dprint("Total BA demand:"..BA_eu_demand)
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meta:set_string("infotext",
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S("%s. Supply: %d Demand: %d"):format(
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machine_name, PR_eu_supply, RE_eu_demand))
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-- If the PR supply is enough for the RE demand supply them all
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if PR_eu_supply >= RE_eu_demand then
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--dprint("PR_eu_supply"..PR_eu_supply.." >= RE_eu_demand"..RE_eu_demand)
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for _, pos1 in pairs(RE_nodes) do
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meta1 = minetest.get_meta(pos1)
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local eu_demand = meta1:get_int(eu_demand_str)
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meta1:set_int(eu_input_str, eu_demand)
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end
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-- We have a surplus, so distribute the rest equally to the BA nodes
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-- Let's calculate the factor of the demand
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PR_eu_supply = PR_eu_supply - RE_eu_demand
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local charge_factor = 0 -- Assume all batteries fully charged
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if BA_eu_demand > 0 then
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charge_factor = PR_eu_supply / BA_eu_demand
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end
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for n, pos1 in pairs(BA_nodes) do
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meta1 = minetest.get_meta(pos1)
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local eu_demand = meta1:get_int(eu_demand_str)
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meta1:set_int(eu_input_str, math.floor(eu_demand * charge_factor))
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--dprint("Charging battery:"..math.floor(eu_demand*charge_factor))
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end
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return
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end
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-- If the PR supply is not enough for the RE demand we will discharge the batteries too
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if PR_eu_supply + BA_eu_supply >= RE_eu_demand then
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--dprint("PR_eu_supply "..PR_eu_supply.."+BA_eu_supply "..BA_eu_supply.." >= RE_eu_demand"..RE_eu_demand)
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for _, pos1 in pairs(RE_nodes) do
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meta1 = minetest.get_meta(pos1)
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local eu_demand = meta1:get_int(eu_demand_str)
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meta1:set_int(eu_input_str, eu_demand)
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end
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-- We have a deficit, so distribute to the BA nodes
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-- Let's calculate the factor of the supply
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local charge_factor = 0 -- Assume all batteries depleted
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if BA_eu_supply > 0 then
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charge_factor = (PR_eu_supply - RE_eu_demand) / BA_eu_supply
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end
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for n,pos1 in pairs(BA_nodes) do
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meta1 = minetest.get_meta(pos1)
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local eu_supply = meta1:get_int(eu_supply_str)
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meta1:set_int(eu_input_str, math.floor(eu_supply * charge_factor))
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--dprint("Discharging battery:"..math.floor(eu_supply*charge_factor))
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end
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return
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end
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-- If the PR+BA supply is not enough for the RE demand: Power only the batteries
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local charge_factor = 0 -- Assume all batteries fully charged
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if BA_eu_demand > 0 then
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charge_factor = PR_eu_supply / BA_eu_demand
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end
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for n, pos1 in pairs(BA_nodes) do
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meta1 = minetest.get_meta(pos1)
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local eu_demand = meta1:get_int(eu_demand_str)
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meta1:set_int(eu_input_str, math.floor(eu_demand * charge_factor))
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end
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for n, pos1 in pairs(RE_nodes) do
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meta1 = minetest.get_meta(pos1)
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meta1:set_int(eu_input_str, 0)
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end
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end,
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})
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for tier, machines in pairs(technic.machines) do
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-- SPECIAL will not be traversed
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technic.register_machine(tier, "technic:switching_station", "SPECIAL")
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end
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