-- 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.DBG = 1
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local dprint = technic.dprint
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minetest.register_craft(
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{
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output = 'technic:switching_station 1',
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recipe = {
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{'technic:lv_transformer', 'technic:mv_transformer', 'technic:hv_transformer'},
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{'technic:lv_transformer', 'technic:mv_transformer', 'technic:hv_transformer'},
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{'technic:lv_cable', 'technic:mv_cable', 'technic:hv_cable'},
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}
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})
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minetest.register_node(
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"technic:switching_station",
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{description = "Switching Station",
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tiles = {"technic_water_mill_top_active.png", "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", "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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is_ground_content = true,
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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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selection_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.env:get_meta(pos)
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meta:set_string("infotext", "Switching Station")
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-- minetest.chat_send_player(puncher:get_player_name(), "Switching station constructed. Punch the station to shut down the network.");
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-- meta:set_int("active", 1)
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end,
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-- on_punch = function(pos, node, puncher)
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-- local meta = minetest.env:get_meta(pos)
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-- local active = meta:get_int("active")
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-- if active == 1 then
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-- meta:set_int("active", 0)
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-- minetest.chat_send_player(puncher:get_player_name(), "Electrical network shut down. Punch again to turn it on.");
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-- else
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-- meta:set_int("active", 1)
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-- minetest.chat_send_player(puncher:get_player_name(), "Electrical network turned on. Punch again to shut it down.");
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-- end
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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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technic.switching_station_timeout_count = function(pos, machine_tier)
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local meta = minetest.env:get_meta(pos)
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timeout = meta:get_int(machine_tier.."_EU_timeout")
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--print("Counting timeout "..timeout)
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if timeout == 0 then
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--print("OFF")
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meta:set_int(machine_tier.."_EU_input", 0)
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else
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--print("ON")
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meta:set_int(machine_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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local i = 1
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repeat
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if nodes[i]==nil then break end
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if pos.x==nodes[i].x and pos.y==nodes[i].y and pos.z==nodes[i].z then return false end
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i=i+1
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until false
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nodes[i] = {x=pos.x, y=pos.y, z=pos.z, visited=1} -- copy position
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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,cablename)
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local meta = minetest.env:get_meta(pos)
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local name = minetest.env:get_node(pos).name
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if meta:get_float(cablename)==1 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] == "PR" then
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add_new_cable_node(PR_nodes,pos)
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elseif machines[name] == "RE" then
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add_new_cable_node(RE_nodes,pos)
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elseif machines[name] == "BA" then
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add_new_cable_node(BA_nodes,pos)
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end
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if cablename == "cablelike" then
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meta:set_int("LV_EU_timeout", 2) -- Touch node
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elseif cablename == "mv_cablelike" then
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meta:set_int("MV_EU_timeout", 2) -- Touch node
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elseif cablename == "hv_cablelike" then
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meta:set_int("HV_EU_timeout", 2) -- Touch node
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end
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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, cablename)
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local pos = {x=all_nodes[i].x, y=all_nodes[i].y, z=all_nodes[i].z} -- copy position
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pos.x=pos.x+1
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check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
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pos.x=pos.x-2
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check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
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pos.x=pos.x+1
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pos.y=pos.y+1
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check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
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pos.y=pos.y-2
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check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
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pos.y=pos.y+1
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pos.z=pos.z+1
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check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
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pos.z=pos.z-2
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check_node_subp(PR_nodes,RE_nodes,BA_nodes,all_nodes,pos, machines, cablename)
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pos.z=pos.z+1
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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.env: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 network = ""
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local all_nodes = {}
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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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-- -- Possible to turn off the entire network
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-- if meta:get_int("active") == 0 then
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-- for _,pos1 in pairs(RE_nodes) do
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-- meta1 = minetest.env:get_meta(pos1)
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-- meta1:set_int("EU_input", 0)
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-- end
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-- for _,pos1 in pairs(BA_nodes) do
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-- meta1 = minetest.env:get_meta(pos1)
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-- meta1:set_int("EU_input", 0)
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-- end
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-- return
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-- end
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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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all_nodes[1] = pos1
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meta1 = minetest.env:get_meta(pos1)
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if meta1:get_float("cablelike") ==1 then
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-- LV type
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--dprint("LV type")
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network = "LV"
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local table_index = 1
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repeat
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traverse_network(PR_nodes,RE_nodes,BA_nodes,all_nodes,table_index, technic.LV_machines, "cablelike")
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table_index = table_index + 1
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if all_nodes[table_index] == nil then break end
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until false
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elseif meta1:get_float("mv_cablelike") ==1 then
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-- MV type
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--dprint("MV type")
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network = "MV"
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local table_index = 1
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repeat
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traverse_network(PR_nodes,RE_nodes,BA_nodes,all_nodes,table_index, technic.MV_machines, "mv_cablelike")
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table_index = table_index + 1
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if all_nodes[table_index] == nil then break end
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until false
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elseif meta1:get_float("hv_cablelike") ==1 then
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-- HV type
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--dprint("HV type")
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network = "HV"
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local table_index = 1
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repeat
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traverse_network(PR_nodes,RE_nodes,BA_nodes,all_nodes,table_index, technic.HV_machines, "hv_cablelike")
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table_index = table_index + 1
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if all_nodes[table_index] == nil then break end
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until false
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else
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-- No type :-)
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--dprint("Not connected to a network")
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meta:set_string("infotext", "Switching Station - no network")
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return
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end
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--dprint("nodes="..table.getn(all_nodes).." PR="..table.getn(PR_nodes).." BA="..table.getn(BA_nodes).." RE="..table.getn(RE_nodes))
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-- Strings for the meta data
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local eu_demand_str = network.."_EU_demand"
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local eu_input_str = network.."_EU_input"
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local eu_supply_str = network.."_EU_supply"
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local eu_from_fuel_str = network.."_EU_from_fuel"
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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.env: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.env: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.env: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.env: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", "Switching Station. PR("..(PR_eu_supply+BA_eu_supply)..") RE("..(RE_eu_demand+BA_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.env: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.env: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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-- If still a surplus we can start giving back to the fuel burning generators
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-- Only full EU packages are given back. The rest is wasted.
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if BA_eu_demand == 0 then
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for _,pos1 in pairs(PR_nodes) do
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meta1 = minetest.env:get_meta(pos1)
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if meta1:get_int(eu_from_fuel_str) == 1 then
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local eu_supply = meta1:get_int(eu_supply_str)
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if PR_eu_supply < eu_supply then
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break
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else
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-- Set the supply to 0 if we did not require it.
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meta1:set_int(eu_supply_str, 0)
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PR_eu_supply = PR_eu_supply - eu_supply
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end
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end
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end
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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.env: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.env: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: Shut everything down!
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-- Note: another behaviour could also be imagined: provide the average power for all and let the node decide what happens.
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-- This is much simpler though: Not enough power for all==no power for all
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--print("NO POWER")
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for _,pos1 in pairs(RE_nodes) do
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meta1 = minetest.env: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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