mirror of https://github.com/OpenTTD/OpenTTD.git
48 lines
2.3 KiB
C++
48 lines
2.3 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file timer_game_calendar.h Definition of the game-calendar-timer */
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#ifndef TIMER_GAME_CALENDAR_H
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#define TIMER_GAME_CALENDAR_H
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#include "../stdafx.h"
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#include "../core/strong_typedef_type.hpp"
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#include "timer_game_common.h"
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/**
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* Timer that is increased every 27ms, and counts towards ticks / days / months / years.
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*
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* The amount of days in a month depends on the month and year (leap-years).
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* There are always 74 ticks in a day (and with 27ms, this makes 1 day 1.998 seconds).
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*
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* Calendar time is used for technology and time-of-year changes, including:
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* - Vehicle, airport, station, object introduction and obsolescence
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* - NewGRF variables for visual styles or behavior based on year or time of year (e.g. variable snow line)
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* - Inflation, since it is tied to original game years. One interpretation of inflation is that it compensates for faster and higher capacity vehicles,
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* another is that it compensates for more established companies. Each of these point to a different choice of calendar versus economy time, but we have to pick one
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* so we follow a previous decision to tie inflation to original TTD game years.
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*/
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class TimerGameCalendar : public TimerGame<struct Calendar> {
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public:
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static Year year; ///< Current year, starting at 0.
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static Month month; ///< Current month (0..11).
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static Date date; ///< Current date in days (day counter).
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static DateFract date_fract; ///< Fractional part of the day.
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static YearMonthDay ConvertDateToYMD(Date date);
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static Date ConvertYMDToDate(Year year, Month month, Day day);
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static void SetDate(Date date, DateFract fract);
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};
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/**
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* Storage class for Calendar time constants.
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*/
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class CalendarTime : public TimerGameConst<struct Calendar> {};
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#endif /* TIMER_GAME_CALENDAR_H */
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