Function ChangeTimekeepingUnits

src/settings_table.cpp:595–631

* Callback for when the player changes the timekeeping units. * @param Unused. */

 * @param Unused.
 */
static void ChangeTimekeepingUnits(int32_t)
{
	/* If service intervals are in time units (calendar days or real-world minutes), reset them to the correct defaults. */
	if (!_settings_client.company.vehicle.servint_ispercent) {
		UpdateAllServiceInterval(0);
	}

	/* If we are using calendar timekeeping, "minutes per year" must be default. */
	if (!TimerGameEconomy::UsingWallclockUnits(true)) {
		_settings_newgame.economy.minutes_per_calendar_year = CalendarTime::DEF_MINUTES_PER_YEAR;
	}

	InvalidateWindowClassesData(WC_GAME_OPTIONS, 0);

	/* It is possible to change these units in Scenario Editor. We must set the economy date appropriately. */
	if (_game_mode == GM_EDITOR) {
		TimerGameEconomy::Date new_economy_date;
		TimerGameEconomy::DateFract new_economy_date_fract;

		if (TimerGameEconomy::UsingWallclockUnits()) {
			/* If the new mode is wallclock units, set the economy year back to 1. */
			new_economy_date = TimerGameEconomy::ConvertYMDToDate(TimerGameEconomy::Year{1}, 0, 1);
			new_economy_date_fract = 0;
		} else {
			/* If the new mode is calendar units, sync the economy year with the calendar year. */
			new_economy_date = TimerGameEconomy::Date{TimerGameCalendar::date.base()};
			new_economy_date_fract = TimerGameCalendar::date_fract;
		}

		/* If you open a savegame as a scenario, there may already be link graphs and/or vehicles. These use economy date. */
		LinkGraphSchedule::instance.ShiftDates(new_economy_date - TimerGameEconomy::date);
		for (auto v : Vehicle::Iterate()) v->ShiftDates(new_economy_date - TimerGameEconomy::date);

		/* Only change the date after changing cached values above. */
		TimerGameEconomy::SetDate(new_economy_date, new_economy_date_fract);
	}
}

/**
 * Callback after the player changes the minutes per year.