David Leal
2020-06-12 a8daa417c485ee20716ec050d4c676b5c91af773
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-- A Hydro Turbine produces MV EUs by exploiting flowing water across it
-- It is a MV EU supplier and fairly high yield (max 1800EUs)
 
local S = technic.getter
 
local cable_entry = "^technic_cable_connection_overlay.png"
 
minetest.register_alias("hydro_turbine", "technic:hydro_turbine")
 
minetest.register_craft({
    output = 'technic:hydro_turbine',
    recipe = {
        {'technic:stainless_steel_ingot', 'technic:water_mill', 'technic:stainless_steel_ingot'},
        {'technic:water_mill', 'technic:mv_transformer', 'technic:water_mill'},
        {'technic:stainless_steel_ingot', 'technic:mv_cable', 'technic:stainless_steel_ingot'},
    }
})
 
local function get_water_flow(pos)
    local node = minetest.get_node(pos)
    if minetest.get_item_group(node.name, "water") == 3 and string.find(node.name, "flowing") then
        return node.param2 -- returns approx. water flow, if any
    end
    return 0
end
 
---
-- 10 times better than LV hydro because of 2 extra water mills and 4 stainless steel, a transformer and whatnot ;P.
-- Man hydro turbines are tough and long lasting. So, give it some value :)
local run = function(pos, node)
    local meta             = minetest.get_meta(pos)
    local water_flow       = 0
    local production_level
    local eu_supply
    local max_output       = 40 * 45 -- Generates 1800EU/s
 
    local positions = {
        {x=pos.x+1, y=pos.y, z=pos.z},
        {x=pos.x-1, y=pos.y, z=pos.z},
        {x=pos.x,   y=pos.y, z=pos.z+1},
        {x=pos.x,   y=pos.y, z=pos.z-1},
    }
 
    for _, p in pairs(positions) do
        water_flow = water_flow + get_water_flow(p)
    end
 
    eu_supply = math.min(40 * water_flow, max_output)
    production_level = math.floor(100 * eu_supply / max_output)
 
    meta:set_int("MV_EU_supply", eu_supply)
 
    meta:set_string("infotext",
    S("Hydro %s Generator"):format("MV").." ("..production_level.."%)")
    if production_level > 0 and
        minetest.get_node(pos).name == "technic:hydro_turbine" then
        technic.swap_node(pos, "technic:hydro_turbine_active")
        meta:set_int("MV_EU_supply", 0)
        return
    end
    if production_level == 0 then
        technic.swap_node(pos, "technic:hydro_turbine")
    end
end
 
minetest.register_node("technic:hydro_turbine", {
    description = S("Hydro %s Generator"):format("MV"),
    tiles = {
        "technic_hydro_turbine_top.png",
        "technic_machine_bottom.png"..cable_entry,
        "technic_hydro_turbine_side.png",
        "technic_hydro_turbine_side.png",
        "technic_hydro_turbine_side.png",
        "technic_hydro_turbine_side.png"
    },
    paramtype2 = "facedir",
    groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2,
    technic_machine=1, technic_mv=1},
    legacy_facedir_simple = true,
    sounds = default.node_sound_wood_defaults(),
    on_construct = function(pos)
        local meta = minetest.get_meta(pos)
        meta:set_string("infotext", S("Hydro %s Generator"):format("MV"))
        meta:set_int("MV_EU_supply", 0)
    end,
    technic_run = run,
})
 
minetest.register_node("technic:hydro_turbine_active", {
    description = S("Hydro %s Generator"):format("MV"),
    tiles = {"technic_hydro_turbine_top_active.png", "technic_machine_bottom.png",
            "technic_hydro_turbine_side.png", "technic_hydro_turbine_side.png",
            "technic_hydro_turbine_side.png", "technic_hydro_turbine_side.png"},
    paramtype2 = "facedir",
    groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2,
            technic_machine=1, technic_mv=1, not_in_creative_inventory=1},
    legacy_facedir_simple = true,
    sounds = default.node_sound_wood_defaults(),
    drop = "technic:hydro_turbine",
    technic_run = run,
    technic_disabled_machine_name = "technic:hydro_turbine",
})
 
technic.register_machine("MV", "technic:hydro_turbine",        technic.producer)
technic.register_machine("MV", "technic:hydro_turbine_active", technic.producer)