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RedMew/map_gen/Diggy/Feature/AlienSpawner.lua

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--[[-- info
Provides the ability to spawn aliens.
]]
-- dependencies
local Event = require 'utils.event'
local AlienEvolutionProgress = require 'map_gen.Diggy.AlienEvolutionProgress'
local Debug = require 'map_gen.Diggy.Debug'
local Template = require 'map_gen.Diggy.Template'
-- this
local ScatteredResources = {}
local function spawn_alien(surface, x, y)
local enemy_force = game.forces.enemy
local enemy_force_evolution = enemy_force.evolution_factor
local position = {x = x, y = y}
local biters = AlienEvolutionProgress.getBitersByEvolution(math.random(1, 2), enemy_force_evolution)
local spitters = AlienEvolutionProgress.getSpittersByEvolution(math.random(1, 2), enemy_force_evolution)
local units = {}
for name, amount in pairs(biters) do
table.insert(units, {name = name, position = position, force = enemy_force, amount = amount})
end
for name, amount in pairs(spitters) do
table.insert(units, {name = name, position = position, force = enemy_force, amount = amount})
end
Template.units(surface, units, 3)
end
--[[--
Registers all event handlers.
]]
function ScatteredResources.register(cfg)
local config = cfg.features.AlienSpawner
local alien_minimum_distance_square = config.alien_minimum_distance ^ 2
Event.add(Template.events.on_void_removed, function(event)
local x = event.old_tile.position.x
local y = event.old_tile.position.y
if (x^2 + y^2 < alien_minimum_distance_square or config.alien_probability < math.random()) then
return
end
spawn_alien(event.surface, x, y)
end)
end
--[[--
Initializes the Feature.
@param config Table {@see Diggy.Config}.
]]
function ScatteredResources.initialize(config)
end
return ScatteredResources