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https://github.com/Refactorio/RedMew/issues/283 - Increase biter aggression

Purpose: Increase biter threat level over time Every chunk has a chance of attack Threat buildup is based on evolution Lights reduce rate of threat buildup in a chunk

pseudo:

chunkIndex [x][y] = index in chunkIndex
chunks = [
	chunk{
		lamps: #
		threat: #
		power: %
		lamps[
			entity, entity, ...
		]
	}..
]
chunks_count = #chunks

chunk_scan_index = 0
scan_start = 0
next_chunk_to_attack = chunk

chunk_to_attack = chunk
next_attack_tick = 0
attackers = 0

min_attack_minutes 1
max_attack_minutes 10
max_attackers_per_minute 10


chunk_rescan_cooldown_minutes = 2

on tick {
	scan_chunk
	
	if game tick > next_attack_tick
	do_attack
}

do_attack {
	
	if game tick = next_attack_tick + 1
		attackers = max_attackers_per_minute * attackers * evo (10 * 10 min * .1 = 10)
		spawners = attackers/10
		find somewhere for spawners
	
	if game tick % 6
		find somewhere for attacker
		attackers -= 1
	
	if attackers < 1
		next_attack_tick = next attack in 1 to 10 minutes
		attackers = # of minutes
	
}

scan_chunk{

	if scan_start < tick
		return

	chunk_scan_index ++
	if chunk_scan_index >= chunks_count
		chunk_scan_index = 1
		scan_start += chunk_rescan_cooldown_minutes*3600

	chunk = chunks[chunk_scan_index]
	
	check power on a lamp, use to adjust chunk power
	chunk.threat += evo / (lamps / power)

	set next_chunk_to_attack if higher than current
}

on lamp created{
	lamps++ for the chunk
}

on lamp destroyed{
	lamps-- for the chunk
}

Cave miner snip: https://github.com/M3wM3w/ComfyFactorio/blob/master/maps/cave_miner.lua#L1040-L1054

wishlist:

• Put a decoration there, to show that it will happen
• Slowly start creating spawners
• Keep increasing until found by a player (player enters chunk?)
• Weapons in a chunk decrease threat by x% every scan?

https://lua-api.factorio.com/latest/LuaSurface.html#LuaSurface.get_random_chunk

https://lua-api.factorio.com/latest/LuaSurface.html#LuaSurface.find_non_colliding_position

https://lua-api.factorio.com/latest/LuaSurface.html#LuaSurface.get_closest

https://lua-api.factorio.com/latest/LuaEntityPrototype.html#LuaEntityPrototype.darkness_for_all_lamps_on https://lua-api.factorio.com/latest/LuaEntityPrototype.html#LuaEntityPrototype.min_darkness_to_spawn

https://lua-api.factorio.com/latest/LuaRendering.html#LuaRendering.draw_light

https://lua-api.factorio.com/latest/LuaRendering.html#LuaRendering.get_players

https://lua-api.factorio.com/latest/LuaPlayer.html#LuaPlayer.add_custom_alert https://lua-api.factorio.com/latest/LuaControl.html#LuaControl.position