ComfyFactorio/maps/tools/map_pregen.lua

local event = require 'utils.event'

local function on_tick(event)
	if global.map_pregeneration_is_active then
		if game.tick % 600 == 0 then
			local r = 1
			for x = 1, global.chunk_radius, 1 do
				if game.forces.map_pregen.is_chunk_charted(game.players[1].surface, {x,x}) then r = x end
			end
			game.print("Map chunks are generating... current radius " .. r, { r=0.22, g=0.99, b=0.99})				
			if game.forces.map_pregen.is_chunk_charted(game.players[1].surface, {global.chunk_radius, global.chunk_radius}) then
				game.print("Map generation done!", {r=0.22, g=0.99, b=0.99})
				
				game.players[1].force = game.forces["player"]
				global.map_pregeneration_is_active = nil
			end
		end
	end
end

function map_pregen(chunk_radius)
	if chunk_radius then
		global.chunk_radius = chunk_radius
	else
		global.chunk_radius = 32
	end
	local radius = global.chunk_radius * 32
	if not game.forces.map_pregen then game.create_force("map_pregen") end
	game.players[1].force = game.forces["map_pregen"]
	game.forces.map_pregen.chart(game.players[1].surface,{{x = -1 * radius, y = -1 * radius}, {x = radius, y = radius}})
	global.map_pregeneration_is_active = true
end

event.add(defines.events.on_tick, on_tick)