functions.lua

function tech_add_prerequisite(technology, prerequisite)
	if data.raw.technology[technology] and data.raw.technology[prerequisite] then
		local add = true
		if data.raw.technology[technology].prerequisites then
			for i, check in ipairs(data.raw.technology[technology].prerequisites) do
				if check == prerequisite then add = false end
			end
		else
			data.raw.technology[technology].prerequisites = {}
		end
		if add then table.insert(data.raw.technology[technology].prerequisites, prerequisite) end
	else
		if not data.raw.technology[technology] then
			-- log("Tech " .. technology .. " does not exist.")
		end
		if not data.raw.technology[prerequisite] then
			-- log("Tech " .. prerequisite .. " does not exist.")
		end
	end
end

function distance(position1, position2)
  return ((position1.x - position2.x)^2 + (position1.y - position2.y)^2)^0.5
end

function debug_log(msg)
	if fcm_debug then log(msg) end
end