author | rubidium |
Thu, 28 Jun 2007 13:58:39 +0000 | |
branch | 0.5 |
changeset 5518 | d5923d3fa08c |
parent 4666 | 850b5b6e4bac |
child 5642 | bfa6074e2833 |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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#ifndef DATE_H |
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#define DATE_H |
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/** |
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* 1 day is 74 ticks; _date_fract used to be uint16 and incremented by 885. On |
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* an overflow the new day begun and 65535 / 885 = 74. |
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* 1 tick is approximately 30 ms. |
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* 1 day is thus about 2 seconds (74 * 30 = 2220) on a machine that can run OpenTTD normally |
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*/ |
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#define DAY_TICKS 74 |
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/* |
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* ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR and DAYS_TILL_ORIGINAL_BASE_YEAR are |
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* primarily used for loading newgrf and savegame data and returning some |
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* newgrf (callback) functions that were in the original (TTD) inherited |
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* format, where '_date == 0' meant that it was 1920-01-01. |
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*/ |
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/** The minimum starting year/base year of the original TTD */ |
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#define ORIGINAL_BASE_YEAR 1920 |
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/** The maximum year of the original TTD */ |
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#define ORIGINAL_MAX_YEAR 2090 |
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/** |
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* The offset in days from the '_date == 0' till |
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* 'ConvertYMDToDate(ORIGINAL_BASE_YEAR, 0, 1)' |
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*/ |
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#define DAYS_TILL_ORIGINAL_BASE_YEAR (365 * ORIGINAL_BASE_YEAR + ORIGINAL_BASE_YEAR / 4 - ORIGINAL_BASE_YEAR / 100 + ORIGINAL_BASE_YEAR / 400) |
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/* The absolute minimum & maximum years in OTTD */ |
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#define MIN_YEAR 0 |
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/* MAX_YEAR, nicely rounded value of the number of years that can |
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* be encoded in a single 32 bits date, about 2^31 / 366 years. */ |
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#define MAX_YEAR 5000000 |
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/* Year and Date are defined elsewhere */ |
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typedef uint8 Month; |
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typedef uint8 Day; |
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typedef uint16 DateFract; |
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typedef struct YearMonthDay { |
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Year year; |
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Month month; |
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Day day; |
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} YearMonthDay; |
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extern Year _cur_year; |
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extern Month _cur_month; |
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extern Date _date; |
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extern DateFract _date_fract; |
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void SetDate(Date date); |
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void ConvertDateToYMD(Date date, YearMonthDay *ymd); |
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Date ConvertYMDToDate(Year year, Month month, Day day); |
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#endif /* DATE_H */ |