You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
137 lines
6.0 KiB
C
137 lines
6.0 KiB
C
/*
|
|
* This file is part of OpenTTD.
|
|
* 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.
|
|
* 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.
|
|
* 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/>.
|
|
*/
|
|
|
|
/** @file date_type.h Types related to the dates in OpenTTD. */
|
|
|
|
#ifndef DATE_TYPE_H
|
|
#define DATE_TYPE_H
|
|
|
|
typedef int32 Date; ///< The type to store our dates in
|
|
typedef uint16 DateFract; ///< The fraction of a date we're in, i.e. the number of ticks since the last date changeover
|
|
typedef int32 Ticks; ///< The type to store ticks in
|
|
typedef int32 DateTicks; ///< The type to store dates in when tick-precision is required
|
|
typedef int64 DateTicksScaled; ///< The type to store dates scaled by the day length factor in when tick-precision is required
|
|
typedef int64 Minutes; ///< The type to store minutes in
|
|
|
|
typedef int32 Year; ///< Type for the year, note: 0 based, i.e. starts at the year 0.
|
|
typedef uint8 Month; ///< Type for the month, note: 0 based, i.e. 0 = January, 11 = December.
|
|
typedef uint8 Day; ///< Type for the day of the month, note: 1 based, first day of a month is 1.
|
|
|
|
/**
|
|
* 1 day is 74 ticks; _date_fract used to be uint16 and incremented by 885. On
|
|
* an overflow the new day begun and 65535 / 885 = 74.
|
|
* 1 tick is approximately 27 ms.
|
|
* 1 day is thus about 2 seconds (74 * 27 = 1998) on a machine that can run OpenTTD normally
|
|
*/
|
|
static const int DAY_TICKS = 74; ///< ticks per day
|
|
static const int DAYS_IN_YEAR = 365; ///< days per year
|
|
static const int DAYS_IN_LEAP_YEAR = 366; ///< sometimes, you need one day more...
|
|
static const int MONTHS_IN_YEAR = 12; ///< months per year
|
|
|
|
static const int SECONDS_PER_DAY = 2; ///< approximate seconds per day, not for precise calculations
|
|
|
|
#define DATE_UNIT_SIZE (_settings_time.time_in_minutes ? _settings_time.ticks_per_minute : (DAY_TICKS * _settings_game.economy.day_length_factor))
|
|
|
|
static const int STATION_RATING_TICKS = 185; ///< cycle duration for updating station rating
|
|
static const int STATION_ACCEPTANCE_TICKS = 250; ///< cycle duration for updating station acceptance
|
|
static const int STATION_LINKGRAPH_TICKS = 504; ///< cycle duration for cleaning dead links
|
|
static const int CARGO_AGING_TICKS = 185; ///< cycle duration for aging cargo
|
|
static const int INDUSTRY_PRODUCE_TICKS = 256; ///< cycle duration for industry production
|
|
static const int TOWN_GROWTH_TICKS = 70; ///< cycle duration for towns trying to grow. (this originates from the size of the town array in TTD
|
|
static const int INDUSTRY_CUT_TREE_TICKS = INDUSTRY_PRODUCE_TICKS * 2; ///< cycle duration for lumber mill's extra action
|
|
|
|
/*
|
|
* ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR and DAYS_TILL_ORIGINAL_BASE_YEAR are
|
|
* primarily used for loading newgrf and savegame data and returning some
|
|
* newgrf (callback) functions that were in the original (TTD) inherited
|
|
* format, where '_date == 0' meant that it was 1920-01-01.
|
|
*/
|
|
|
|
/** The minimum starting year/base year of the original TTD */
|
|
static const Year ORIGINAL_BASE_YEAR = 1920;
|
|
/** The original ending year */
|
|
static const Year ORIGINAL_END_YEAR = 2051;
|
|
/** The maximum year of the original TTD */
|
|
static const Year ORIGINAL_MAX_YEAR = 2090;
|
|
|
|
/**
|
|
* Calculate the number of leap years till a given year.
|
|
*
|
|
* Each passed leap year adds one day to the 'day count'.
|
|
*
|
|
* A special case for the year 0 as no year has been passed,
|
|
* but '(year - 1) / 4' does not yield '-1' to counteract the
|
|
* '+1' at the end of the formula as divisions round to zero.
|
|
*
|
|
* @param year the year to get the leap years till.
|
|
* @return the number of leap years.
|
|
*/
|
|
#define LEAP_YEARS_TILL(year) ((year) == 0 ? 0 : ((year) - 1) / 4 - ((year) - 1) / 100 + ((year) - 1) / 400 + 1)
|
|
|
|
/**
|
|
* Calculate the date of the first day of a given year.
|
|
* @param year the year to get the first day of.
|
|
* @return the date.
|
|
*/
|
|
#define DAYS_TILL(year) (DAYS_IN_YEAR * (year) + LEAP_YEARS_TILL(year))
|
|
|
|
/**
|
|
* The offset in days from the '_date == 0' till
|
|
* 'ConvertYMDToDate(ORIGINAL_BASE_YEAR, 0, 1)'
|
|
*/
|
|
#define DAYS_TILL_ORIGINAL_BASE_YEAR DAYS_TILL(ORIGINAL_BASE_YEAR)
|
|
|
|
static const Date MIN_DATE = 0;
|
|
|
|
/** The absolute minimum & maximum years in OTTD */
|
|
static const Year MIN_YEAR = 0;
|
|
|
|
/** The default starting year */
|
|
static const Year DEF_START_YEAR = 1950;
|
|
/** The default scoring end year */
|
|
static const Year DEF_END_YEAR = ORIGINAL_END_YEAR - 1;
|
|
|
|
/**
|
|
* MAX_YEAR, nicely rounded value of the number of years that can
|
|
* be encoded in a single 32 bits date, about 2^31 / 366 years.
|
|
*/
|
|
static const Year MAX_YEAR = 5000000;
|
|
|
|
/** The number of days till the last day */
|
|
#define MAX_DAY (DAYS_TILL(MAX_YEAR + 1) - 1)
|
|
|
|
/** The day when converting to minutes */
|
|
#define MINUTES_DAY(minutes) (minutes / 1440)
|
|
|
|
/** The hour when converting to minutes */
|
|
#define MINUTES_HOUR(minutes) ((minutes / 60) % 24)
|
|
|
|
/** The day when converting to minutes */
|
|
#define MINUTES_MINUTE(minutes) (minutes % 60)
|
|
|
|
/** Convert minutes to a date */
|
|
#define MINUTES_DATE(day, hour, minute) ((day * 1440) + (hour * 60) + minute)
|
|
|
|
/** Get the current date in minutes */
|
|
#define CURRENT_MINUTE (_scaled_date_ticks / _settings_time.ticks_per_minute)
|
|
|
|
/**
|
|
* Data structure to convert between Date and triplet (year, month, and day).
|
|
* @see ConvertDateToYMD(), ConvertYMDToDate()
|
|
*/
|
|
struct YearMonthDay {
|
|
Year year; ///< Year (0...)
|
|
Month month; ///< Month (0..11)
|
|
Day day; ///< Day (1..31)
|
|
};
|
|
|
|
static const Year INVALID_YEAR = -1; ///< Representation of an invalid year
|
|
static const Date INVALID_DATE = -1; ///< Representation of an invalid date
|
|
static const Ticks INVALID_TICKS = -1; ///< Representation of an invalid number of ticks
|
|
|
|
#endif /* DATE_TYPE_H */
|