diff options
Diffstat (limited to 'i18npool/source/calendar/calendar_hijri.cxx')
| -rw-r--r-- | i18npool/source/calendar/calendar_hijri.cxx | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/i18npool/source/calendar/calendar_hijri.cxx b/i18npool/source/calendar/calendar_hijri.cxx new file mode 100644 index 000000000000..dcf651098574 --- /dev/null +++ b/i18npool/source/calendar/calendar_hijri.cxx @@ -0,0 +1,341 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org 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 Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +// MARKER(update_precomp.py): autogen include statement, do not remove +#include "precompiled_i18npool.hxx" + +#include <stdlib.h> +#include <math.h> + +#include "calendar_hijri.hxx" + +using namespace ::com::sun::star::uno; +using namespace ::com::sun::star::lang; +using namespace ::com::sun::star::i18n; +using namespace ::rtl; + +#define ERROR RuntimeException() + +#define GREGORIAN_CROSSOVER 2299161 + +// not used +//static UErrorCode status; // status is shared in all calls to Calendar, it has to be reset for each call. + +// radians per degree (pi/180) +const double Calendar_hijri::RadPerDeg = 0.01745329251994329577; + +// Synodic Period (mean time between 2 successive new moon: 29d, 12 hr, 44min, 3sec +const double Calendar_hijri::SynPeriod = 29.53058868; +const double Calendar_hijri::SynMonth = 365.25/29.53058868; // Solar days in a year/SynPeriod + +// Julian day on Jan 1, 1900 +const double Calendar_hijri::jd1900 = 2415020.75933; + +// Reference point: March 26, 2001 == 1422 Hijri == 1252 Synodial month from 1900 +const sal_Int32 Calendar_hijri::SynRef = 1252; +const sal_Int32 Calendar_hijri::GregRef = 1422; + +// Local time specific to Saudi Arabia +const double Calendar_hijri::SA_TimeZone = 3.0; + +const double Calendar_hijri::EveningPeriod = 6.0; + +const sal_Int32 Calendar_hijri::LeapYear[] = { + 2, 5, 7, 10, 13, 16, 18, 21, 24, 26, 29 +}; + +Calendar_hijri::Calendar_hijri() +{ + cCalendar = "com.sun.star.i18n.Calendar_hijri"; +} + +#define FIELDS ((1 << CalendarFieldIndex::ERA) | (1 << CalendarFieldIndex::YEAR) | (1 << CalendarFieldIndex::MONTH) | (1 << CalendarFieldIndex::DAY_OF_MONTH)) + +// map field value from hijri calendar to gregorian calendar +void Calendar_hijri::mapToGregorian() throw(RuntimeException) +{ + if (fieldSet & FIELDS) { + sal_Int32 day = (sal_Int32)fieldSetValue[CalendarFieldIndex::DAY_OF_MONTH]; + sal_Int32 month = (sal_Int32)fieldSetValue[CalendarFieldIndex::MONTH] + 1; + sal_Int32 year = (sal_Int32)fieldSetValue[CalendarFieldIndex::YEAR]; + if (fieldSetValue[CalendarFieldIndex::ERA] == 0) + year *= -1; + + ToGregorian(&day, &month, &year); + + fieldSetValue[CalendarFieldIndex::ERA] = year <= 0 ? 0 : 1; + fieldSetValue[CalendarFieldIndex::MONTH] = sal::static_int_cast<sal_Int16>(month - 1); + fieldSetValue[CalendarFieldIndex::DAY_OF_MONTH] = (sal_Int16) day; + fieldSetValue[CalendarFieldIndex::YEAR] = (sal_Int16) abs(year); + fieldSet |= FIELDS; + } +} + +// map field value from gregorian calendar to hijri calendar +void Calendar_hijri::mapFromGregorian() throw(RuntimeException) +{ + sal_Int32 month, day, year; + + day = (sal_Int32)fieldValue[CalendarFieldIndex::DAY_OF_MONTH]; + month = (sal_Int32)fieldValue[CalendarFieldIndex::MONTH] + 1; + year = (sal_Int32)fieldValue[CalendarFieldIndex::YEAR]; + if (fieldValue[CalendarFieldIndex::ERA] == 0) + year *= -1; + + // Get Hijri date + getHijri(&day, &month, &year); + + fieldValue[CalendarFieldIndex::DAY_OF_MONTH] = (sal_Int16)day; + fieldValue[CalendarFieldIndex::MONTH] = sal::static_int_cast<sal_Int16>(month - 1); + fieldValue[CalendarFieldIndex::YEAR] = (sal_Int16) abs(year); + fieldValue[CalendarFieldIndex::ERA] = (sal_Int16) year < 1 ? 0 : 1; +} + +// +// This function returns the Julian date/time of the Nth new moon since +// January 1900. The synodic month is passed as parameter. +// +// Adapted from "Astronomical Formulae for Calculators" by +// Jean Meeus, Third Edition, Willmann-Bell, 1985. +// +double +Calendar_hijri::NewMoon(sal_Int32 n) +{ + double jd, t, t2, t3, k, ma, sa, tf, xtra; + k = n; + t = k/1236.85; // Time in Julian centuries from 1900 January 0.5 + t2 = t * t; + t3 = t2 * t; + + // Mean time of phase + jd = jd1900 + + SynPeriod * k + - 0.0001178 * t2 + - 0.000000155 * t3 + + 0.00033 * sin(RadPerDeg * (166.56 + 132.87 * t - 0.009173 * t2)); + + // Sun's mean anomaly in radian + sa = RadPerDeg * (359.2242 + + 29.10535608 * k + - 0.0000333 * t2 + - 0.00000347 * t3); + + // Moon's mean anomaly + ma = RadPerDeg * (306.0253 + + 385.81691806 * k + + 0.0107306 * t2 + + 0.00001236 * t3); + + // Moon's argument of latitude + tf = RadPerDeg * 2.0 * (21.2964 + + 390.67050646 * k + - 0.0016528 * t2 + - 0.00000239 * t3); + + // should reduce to interval between 0 to 1.0 before calculating further + // Corrections for New Moon + xtra = (0.1734 - 0.000393 * t) * sin(sa) + + 0.0021 * sin(sa * 2) + - 0.4068 * sin(ma) + + 0.0161 * sin(2 * ma) + - 0.0004 * sin(3 * ma) + + 0.0104 * sin(tf) + - 0.0051 * sin(sa + ma) + - 0.0074 * sin(sa - ma) + + 0.0004 * sin(tf + sa) + - 0.0004 * sin(tf - sa) + - 0.0006 * sin(tf + ma) + + 0.0010 * sin(tf - ma) + + 0.0005 * sin(sa + 2 * ma); + + // convert from Ephemeris Time (ET) to (approximate) Universal Time (UT) + jd += xtra - (0.41 + 1.2053 * t + 0.4992 * t2)/1440; + + return (jd); +} + +// Get Hijri Date +void +Calendar_hijri::getHijri(sal_Int32 *day, sal_Int32 *month, sal_Int32 *year) +{ + double prevday; +// double dayfraction; + sal_Int32 syndiff; + sal_Int32 newsyn; + double newjd; + double julday; + sal_Int32 synmonth; + + // Get Julian Day from Gregorian + julday = getJulianDay(*day, *month, *year); + + // obtain approx. of how many Synodic months since the beginning of the year 1900 + synmonth = (sal_Int32)(0.5 + (julday - jd1900)/SynPeriod); + + newsyn = synmonth; + prevday = (sal_Int32)julday - 0.5; + + do { + newjd = NewMoon(newsyn); + + // Decrement syndonic months + newsyn--; + } while (newjd > prevday); + newsyn++; + + // difference from reference point + syndiff = newsyn - SynRef; + + // Round up the day + *day = (sal_Int32)(((sal_Int32)julday) - newjd + 0.5); + *month = (syndiff % 12) + 1; + + // currently not supported + //dayOfYear = (sal_Int32)(month * SynPeriod + day); + *year = GregRef + (sal_Int32)(syndiff / 12); + + // If month negative, consider it previous year + if (syndiff != 0 && *month <= 0) { + *month += 12; + (*year)--; + } + + // If Before Hijri subtract 1 + if (*year <= 0) (*year)--; +} + +void +Calendar_hijri::ToGregorian(sal_Int32 *day, sal_Int32 *month, sal_Int32 *year) +{ + sal_Int32 nmonth; +// double dayfraction; + double jday; +// sal_Int32 dayint; + + if ( *year < 0 ) (*year)++; + + // Number of month from reference point + nmonth = *month + *year * 12 - (GregRef * 12 + 1); + + // Add Synodic Reference point + nmonth += SynRef; + + // Get Julian days add time too + jday = NewMoon(nmonth) + *day; + + // Round-up + jday = (double)((sal_Int32)(jday + 0.5)); + + // Use algorithm from "Numerical Recipes in C" + getGregorianDay((sal_Int32)jday, day, month, year); + + // Julian -> Gregorian only works for non-negative year + if ( *year <= 0 ) { + *day = -1; + *month = -1; + *year = -1; + } +} + +/* this algorithm is taken from "Numerical Recipes in C", 2nd ed, pp 14-15. */ +/* this algorithm only valid for non-negative gregorian year */ +void +Calendar_hijri::getGregorianDay(sal_Int32 lJulianDay, sal_Int32 *pnDay, sal_Int32 *pnMonth, sal_Int32 *pnYear) +{ + /* working variables */ + long lFactorA, lFactorB, lFactorC, lFactorD, lFactorE; + long lAdjust; + + /* test whether to adjust for the Gregorian calendar crossover */ + if (lJulianDay >= GREGORIAN_CROSSOVER) { + /* calculate a small adjustment */ + lAdjust = (long) (((float) (lJulianDay - 1867216) - 0.25) / 36524.25); + + lFactorA = lJulianDay + 1 + lAdjust - ((long) (0.25 * lAdjust)); + + } else { + /* no adjustment needed */ + lFactorA = lJulianDay; + } + + lFactorB = lFactorA + 1524; + lFactorC = (long) (6680.0 + ((float) (lFactorB - 2439870) - 122.1) / 365.25); + lFactorD = (long) (365 * lFactorC + (0.25 * lFactorC)); + lFactorE = (long) ((lFactorB - lFactorD) / 30.6001); + + /* now, pull out the day number */ + *pnDay = lFactorB - lFactorD - (long) (30.6001 * lFactorE); + + /* ...and the month, adjusting it if necessary */ + *pnMonth = lFactorE - 1; + if (*pnMonth > 12) + (*pnMonth) -= 12; + + /* ...and similarly for the year */ + *pnYear = lFactorC - 4715; + if (*pnMonth > 2) + (*pnYear)--; + +// Negative year adjustments + if (*pnYear <= 0) + (*pnYear)--; +} + +double +Calendar_hijri::getJulianDay(sal_Int32 day, sal_Int32 month, sal_Int32 year) +{ + double jy, jm; + + if( year == 0 ) { + return -1.0; + } + + if( year == 1582 && month == 10 && day > 4 && day < 15 ) { + return -1.0; + } + + if( month > 2 ) { + jy = year; + jm = month + 1; + } else { + jy = year - 1; + jm = month + 13; + } + + sal_Int32 intgr = (sal_Int32)((sal_Int32)(365.25 * jy) + (sal_Int32)(30.6001 * jm) + day + 1720995 ); + + //check for switch to Gregorian calendar + double gregcal = 15 + 31 * ( 10 + 12 * 1582 ); + + if( day + 31 * (month + 12 * year) >= gregcal ) { + double ja; + ja = (sal_Int32)(0.01 * jy); + intgr += (sal_Int32)(2 - ja + (sal_Int32)(0.25 * ja)); + } + + return (double) intgr; +} |