ComfyFactorio/modules/spitters_spit_biters.lua

-- spitters spit biters, because why not -- by mewmew

local Event = require 'utils.event'

local radius = 3
local max_biters_in_radius = 3

local biters = {
    ['big-spitter'] = 'small-biter',
    ['behemoth-spitter'] = 'medium-biter'
}

local function on_entity_damaged(event)
    if not event.cause then
        return
    end
    if not event.cause.valid then
        return
    end
    if not biters[event.cause.name] then
        return
    end
    local area = {{event.entity.position.x - radius, event.entity.position.y - radius}, {event.entity.position.x + radius, event.entity.position.y + radius}}
    if event.cause.surface.count_entities_filtered({area = area, name = biters[event.cause.name], limit = 3}) >= max_biters_in_radius then
        return
    end
    local pos = event.cause.surface.find_non_colliding_position(biters[event.cause.name], event.entity.position, radius, 0.5)
    if pos then
        event.cause.surface.create_entity({name = biters[event.cause.name], position = pos})
    end
end

Event.add(defines.events.on_entity_damaged, on_entity_damaged)