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Location: cpp/openttd-patchpack/source/src/date_type.h - annotation
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(svn r19502) -Codechange: During NewGRF loading, store rail type labels in temporary data and process after loading has finished. This avoids deactivated rail vehicles being reactivated if the climate property is set after the rail type property.
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/*
* 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
/**
* 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 30 ms.
* 1 day is thus about 2 seconds (74 * 30 = 2220) on a machine that can run OpenTTD normally
*/
enum {
DAY_TICKS = 74, ///< ticks per day
DAYS_IN_YEAR = 365, ///< days per year
DAYS_IN_LEAP_YEAR = 366, ///< sometimes, you need one day more...
};
/*
* 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 */
#define ORIGINAL_BASE_YEAR 1920
/** The original ending year */
#define ORIGINAL_END_YEAR 2051
/** The maximum year of the original TTD */
#define 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)
/** The absolute minimum & maximum years in OTTD */
#define MIN_YEAR 0
/** The default starting year */
#define DEF_START_YEAR 1950
/**
* 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.
*/
#define MAX_YEAR 5000000
/** The number of days till the last day */
#define MAX_DAY (DAYS_TILL(MAX_YEAR + 1) - 1)
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 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.
/**
* 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 */
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