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292 lines
9.5 KiB
292 lines
9.5 KiB
/*
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This file is part of libkholidays.
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Copyright (c) 2004 Allen Winter <winter@kde.org>
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Copyright (c) 1989, 1993
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The Regents of the University of California. All rights reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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In addition, as a special exception, the copyright holders give
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permission to link the code of this program with any edition of
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the Qt library by Trolltech AS, Norway (or with modified versions
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of Qt that use the same license as Qt), and distribute linked
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combinations including the two. You must obey the GNU General
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Public License in all respects for all of the code used other than
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Qt. If you modify this file, you may extend this exception to
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your version of the file, but you are not obligated to do so. If
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you do not wish to do so, delete this exception statement from
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your version.
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*/
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#include "config.h"
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#include <kglobal.h>
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#include <klocale.h>
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#include <kdebug.h>
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#include "lunarphase.h"
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LunarPhase::LunarPhase( Hemisphere hemisphere )
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{
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mHemisphere = hemisphere;
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}
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LunarPhase::~LunarPhase()
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{
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}
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void LunarPhase::setHemisphere( Hemisphere hemisphere )
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{
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mHemisphere = hemisphere;
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}
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LunarPhase::Hemisphere LunarPhase::hemisphere() const
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{
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return( mHemisphere );
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}
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QString LunarPhase::hemisphereStr() const
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{
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return hemisphereName( mHemisphere );
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}
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QString LunarPhase::hemisphereName( LunarPhase::Hemisphere hemisphere )
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{
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switch( hemisphere ) {
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case Northern:
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default:
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return( i18n( "Northern" ) );
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break;
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case Southern:
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return( i18n( "Southern" ) );
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break;
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}
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}
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QString LunarPhase::phaseStr( const QDate &date ) const
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{
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return phaseName( phase( date ) );
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}
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QString LunarPhase::phaseName( LunarPhase::Phase phase )
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{
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switch ( phase ) {
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case New:
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return( i18n( "New Moon" ) );
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break;
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case Full:
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return( i18n( "Full Moon" ) );
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break;
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case FirstQ:
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return( i18n( "First Quarter Moon" ) );
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break;
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case LastQ:
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return( i18n( "Last Quarter Moon" ) );
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break;
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default:
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case None:
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return( QString::null );
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break;
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}
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}
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LunarPhase::Phase LunarPhase::phase( const QDate &date ) const
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{
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Phase retPhase = None;
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// compute percent-full for the middle of today and yesterday.
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QTime noontime( 12, 0, 0 );
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QDateTime today( date, noontime );
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double todayPer = percentFull( today.toTime_t() );
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QDateTime yesterday( date.addDays(-1), noontime );
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double yesterdayPer = percentFull( yesterday.toTime_t() );
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if ( ( todayPer < 0.50 ) && ( yesterdayPer > 0.50 ) ) {
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retPhase = New;
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} else if ( ( todayPer > 99.50 ) && ( yesterdayPer < 99.50 ) ) {
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retPhase = Full;
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} else {
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// compute percent-full for the start of today.
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QTime sqt( 0, 0, 0 );
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QDateTime start( date, sqt );
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double startPer = percentFull( start.toTime_t() );
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// compute percent-full for the end of today.
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QTime eqt( 23, 59, 59 );
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QDateTime end( date, eqt );
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double endPer = percentFull( end.toTime_t() );
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if ( ( startPer <= 50 ) && ( endPer > 50 ) ) {
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if ( mHemisphere == Northern ) {
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retPhase = FirstQ;
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} else {
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retPhase = LastQ;
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}
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}
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if ( ( endPer <= 50 ) && ( startPer > 50 ) ) {
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if ( mHemisphere == Northern ) {
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retPhase = LastQ;
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} else {
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retPhase = FirstQ;
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}
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}
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// Note: if you want to support crescent and gibbous phases then please
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// read the source for the original BSD 'pom' program.
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}
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return( retPhase );
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}
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software posted to USENET.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if HAVE_SYS_CDEFS_H
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#include <sys/cdefs.h>
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#endif
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/*
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* Phase of the Moon. Calculates the current phase of the moon.
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* Based on routines from `Practical Astronomy with Your Calculator',
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* by Duffett-Smith. Comments give the section from the book that
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* particular piece of code was adapted from.
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*
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* -- Keith E. Brandt VIII 1984
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*
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* Updated to the Third Edition of Duffett-Smith's book, Paul Janzen, IX 1998
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*
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*/
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#include <ctype.h>
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#if HAVE_ERR_H
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#include <err.h>
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#endif
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#include <math.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#ifndef PI
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#define PI 3.14159265358979323846
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#endif
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/*
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* The EPOCH in the third edition of the book is 1990 Jan 0.0 TDT.
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* In this program, we do not bother to correct for the differences
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* between UTC (as shown by the UNIX clock) and TDT. (TDT = TAI + 32.184s;
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* TAI-UTC = 32s in Jan 1999.)
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*/
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#define EPOCH_MINUS_1970 (20 * 365 + 5 - 1) /* 20 years, 5 leaps, back 1 day to Jan 0 */
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#define EPSILONg 279.403303 /* solar ecliptic long at EPOCH */
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#define RHOg 282.768422 /* solar ecliptic long of perigee at EPOCH */
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#define ECCEN 0.016713 /* solar orbit eccentricity */
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#define lzero 318.351648 /* lunar mean long at EPOCH */
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#define Pzero 36.340410 /* lunar mean long of perigee at EPOCH */
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#define Nzero 318.510107 /* lunar mean long of node at EPOCH */
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/*
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* percentFull --
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* return phase of the moon as a percentage of full
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*/
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double LunarPhase::percentFull( uint tmpt ) const
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{
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double N, Msol, Ec, LambdaSol, l, Mm, Ev, Ac, A3, Mmprime;
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double A4, lprime, V, ldprime, D, Nm;
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double days;
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days = ( tmpt - EPOCH_MINUS_1970 * 86400 ) / 86400.0;
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N = 360 * days / 365.242191; /* sec 46 #3 */
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adj360(&N);
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Msol = N + EPSILONg - RHOg; /* sec 46 #4 */
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adj360(&Msol);
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Ec = 360 / PI * ECCEN * sin(degreesToRadians(Msol)); /* sec 46 #5 */
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LambdaSol = N + Ec + EPSILONg; /* sec 46 #6 */
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adj360(&LambdaSol);
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l = 13.1763966 * days + lzero; /* sec 65 #4 */
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adj360(&l);
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Mm = l - (0.1114041 * days) - Pzero; /* sec 65 #5 */
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adj360(&Mm);
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Nm = Nzero - (0.0529539 * days); /* sec 65 #6 */
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adj360(&Nm);
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Ev = 1.2739 * sin(degreesToRadians(2*(l - LambdaSol) - Mm)); /* sec 65 #7 */
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Ac = 0.1858 * sin(degreesToRadians(Msol)); /* sec 65 #8 */
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A3 = 0.37 * sin(degreesToRadians(Msol));
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Mmprime = Mm + Ev - Ac - A3; /* sec 65 #9 */
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Ec = 6.2886 * sin(degreesToRadians(Mmprime)); /* sec 65 #10 */
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A4 = 0.214 * sin(degreesToRadians(2 * Mmprime)); /* sec 65 #11 */
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lprime = l + Ev + Ec - Ac + A4; /* sec 65 #12 */
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V = 0.6583 * sin(degreesToRadians(2 * (lprime - LambdaSol))); /* sec 65 #13 */
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ldprime = lprime + V; /* sec 65 #14 */
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D = ldprime - LambdaSol; /* sec 67 #2 */
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return(50.0 * (1 - cos(degreesToRadians(D)))); /* sec 67 #3 */
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}
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/*
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* degreesToRadians --
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* convert degrees to radians
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*/
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double LunarPhase::degreesToRadians( double degree ) const
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{
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return( degree * PI / 180 );
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}
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/*
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* adj360 --
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* adjust value so 0 <= degree <= 360
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*/
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void LunarPhase::adj360( double *degree ) const
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{
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for( ;; )
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if( *degree < 0 )
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*degree += 360;
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else if( *degree > 360 )
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*degree -= 360;
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else
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break;
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}
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