diff options
Diffstat (limited to 'src/calendar.c')
| -rwxr-xr-x | src/calendar.c | 180 |
1 files changed, 178 insertions, 2 deletions
diff --git a/src/calendar.c b/src/calendar.c index 15c511c..9d75fbe 100755 --- a/src/calendar.c +++ b/src/calendar.c @@ -1,4 +1,4 @@ -/* $calcurse: calendar.c,v 1.9 2007/07/28 13:11:42 culot Exp $ */ +/* $calcurse: calendar.c,v 1.10 2007/08/12 13:09:02 culot Exp $ */ /* * Calcurse - text-based organizer @@ -29,6 +29,7 @@ #include <string.h> #include <sys/types.h> #include <time.h> +#include <math.h> #include "i18n.h" #include "day.h" @@ -39,6 +40,21 @@ #include "vars.h" #include "utils.h" +#ifndef M_PI +#define M_PI 3.14159265358979323846 +#endif + +#define EPOCH 90 +#define EPSILONg 279.403303 /* solar ecliptic long at EPOCH */ +#define RHOg 282.768422 /* solar ecliptic long of perigee at EPOCH */ +#define ECCEN 0.016713 /* solar orbit eccentricity */ +#define lzero 318.351648 /* lunar mean long at EPOCH */ +#define Pzero 36.340410 /* lunar mean long of perigee at EPOCH */ +#define Nzero 318.510107 /* lunar mean long of node at EPOCH */ +#define TM_YEAR_BASE 1900 + +#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) + static date_t today, slctd_day; static bool week_begins_on_monday; static pthread_mutex_t date_thread_mutex = PTHREAD_MUTEX_INITIALIZER; @@ -100,7 +116,7 @@ calendar_set_current_date(void) /* Needed to display sunday or monday as the first day of week in calendar. */ void -calendar_set_first_day_of_week(wday_t first_day) +calendar_set_first_day_of_week(wday_e first_day) { switch (first_day) { case SUNDAY: @@ -437,3 +453,163 @@ calendar_move_down(void) } else slctd_day.dd += 7; } + +/* + * The pom, potm, dotr, adj360 are used to compute the current + * phase of the moon. + * The code is based on the OpenBSD version of pom(6). + * Below is reported the copyright notice. + */ +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software posted to USENET. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * dtor -- + * convert degrees to radians + */ +static double +dtor(double deg) +{ + return(deg * M_PI / 180); +} + +/* + * adj360 -- + * adjust value so 0 <= deg <= 360 + */ +static void +adj360(double *deg) +{ + for (;;) + if (*deg < 0.0) + *deg += 360.0; + else if (*deg > 360.0) + *deg -= 360.0; + else + break; +} + +/* + * potm -- + * return phase of the moon + */ +static double +potm(double days) +{ + double N, Msol, Ec, LambdaSol, l, Mm, Ev, Ac, A3, Mmprime; + double A4, lprime, V, ldprime, D, Nm; + + N = 360.0 * days / 365.242191; /* sec 46 #3 */ + adj360(&N); + Msol = N + EPSILONg - RHOg; /* sec 46 #4 */ + adj360(&Msol); + Ec = 360 / M_PI * ECCEN * sin(dtor(Msol)); /* sec 46 #5 */ + LambdaSol = N + Ec + EPSILONg; /* sec 46 #6 */ + adj360(&LambdaSol); + l = 13.1763966 * days + lzero; /* sec 65 #4 */ + adj360(&l); + Mm = l - (0.1114041 * days) - Pzero; /* sec 65 #5 */ + adj360(&Mm); + Nm = Nzero - (0.0529539 * days); /* sec 65 #6 */ + adj360(&Nm); + Ev = 1.2739 * sin(dtor(2*(l - LambdaSol) - Mm)); /* sec 65 #7 */ + Ac = 0.1858 * sin(dtor(Msol)); /* sec 65 #8 */ + A3 = 0.37 * sin(dtor(Msol)); + Mmprime = Mm + Ev - Ac - A3; /* sec 65 #9 */ + Ec = 6.2886 * sin(dtor(Mmprime)); /* sec 65 #10 */ + A4 = 0.214 * sin(dtor(2 * Mmprime)); /* sec 65 #11 */ + lprime = l + Ev + Ec - Ac + A4; /* sec 65 #12 */ + V = 0.6583 * sin(dtor(2 * (lprime - LambdaSol))); /* sec 65 #13 */ + ldprime = lprime + V; /* sec 65 #14 */ + D = ldprime - LambdaSol; /* sec 67 #2 */ + return(50.0 * (1 - cos(dtor(D)))); /* sec 67 #3 */ +} + +/* + * Phase of the Moon. Calculates the current phase of the moon. + * Based on routines from `Practical Astronomy with Your Calculator', + * by Duffett-Smith. Comments give the section from the book that + * particular piece of code was adapted from. + * + * -- Keith E. Brandt VIII 1984 + * + * Updated to the Third Edition of Duffett-Smith's book, IX 1998 + * + */ +static double +pom(time_t tmpt) +{ + struct tm *GMT; + double days; + int cnt; + pom_e pom; + + pom = NO_POM; + GMT = gmtime(&tmpt); + days = (GMT->tm_yday + 1) + ((GMT->tm_hour + + (GMT->tm_min / 60.0) + (GMT->tm_sec / 3600.0)) / 24.0); + for (cnt = EPOCH; cnt < GMT->tm_year; ++cnt) + days += isleap(cnt + TM_YEAR_BASE) ? 366 : 365; + /* Selected time could be before EPOCH */ + for (cnt = GMT->tm_year; cnt < EPOCH; ++cnt) + days -= isleap(cnt + TM_YEAR_BASE) ? 366 : 365; + + return (potm(days)); +} + +/* + * Return a pictogram representing the current phase of the moon. + * Careful: date is the selected day in calendar at 00:00, so it represents + * the phase of the moon for previous day. + */ +char * +calendar_get_pom(time_t date) +{ + char *pom_pict[MOON_PHASES] = {" ", "|) ", "(|)", "(| ", " | "}; + pom_e phase = NO_POM; + double pom_today, relative_pom, pom_yesterday, pom_tomorrow; + const double half = 50.0; + + pom_yesterday = pom(date); + pom_today = pom(date + DAYINSEC); + relative_pom = abs(pom_today - half); + pom_tomorrow = pom(date + 2 * DAYINSEC); + if (pom_today > pom_yesterday && pom_today > pom_tomorrow) + phase = FULL_MOON; + else if (pom_today < pom_yesterday && pom_today < pom_tomorrow) + phase = NEW_MOON; + else if (relative_pom < abs(pom_yesterday - half) && + relative_pom < abs(pom_tomorrow - half)) + phase = (pom_tomorrow > pom_today) ? + FIRST_QUARTER : LAST_QUARTER; + + return (pom_pict[phase]); +} |