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7e9fb9f21f
. Centralized the functions sunrise/sunset to php_sunrise_sunset
to lessen duplicate code.
. Made wrapper function php_do_date_sunrise_sunset() to lessen
duplicate code.
. Coding style fixes.
. renamed sunfuncs.h -> php_sunfuncs.h
243 lines
6.8 KiB
C
243 lines
6.8 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 4 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2003 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.02 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available at through the world-wide-web at |
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| http://www.php.net/license/2_02.txt. |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Author: Moshe Doron <mosdoron@netvision.net.il> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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/*
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The sun position algorithm taken from the 'US Naval Observatory's
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Almanac for Computers', implemented by Ken Bloom <kekabloom@ucdavis.edu>
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for the zmanim project <http://sourceforge.net/projects/zmanim/>
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and finally converted to C by Moshe Doron <mosdoron@netvision.net.il>.
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*/
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#include "php.h"
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#include "php_sunfuncs.h"
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#include "datetime.h"
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#include "php_ini.h"
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#include <assert.h>
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#include <math.h>
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#include <stdlib.h>
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/* {{{ macros and constants
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*/
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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#define to_rad(degrees) (degrees * M_PI / 180)
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#define to_rad_with_min(degrees) (degrees + minutes / 60)
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#define to_deg(rad) (rad * 180 / M_PI)
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/* }}} */
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/* {{{ php_sunrise_sunset
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returns time in UTC */
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static double php_sunrise_sunset(long N, double latitude, double longitude, double zenith, int calc_sunset)
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{
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double lngHour, t, M, L, Lx, RA, RAx, Lquadrant, RAquadrant, sinDec, cosDec, cosH, H, T, UT, UTx;
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/* step 1: First calculate the day of the year
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int N = theday - date(1, 1, theday.year()) + 1;
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*/
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/* step 2: convert the longitude to hour value and calculate an approximate time */
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lngHour = longitude / 15;
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/* use 18 for sunset instead of 6 */
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if (calc_sunset) {
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t = (double) N + ((18 - lngHour) / 24); /* Sunset */
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} else {
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t = (double) N + ((6 - lngHour) / 24); /* Sunrise */
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}
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/* step 3: calculate the sun's mean anomaly */
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M = (0.9856 * t) - 3.289;
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/* step 4: calculate the sun's true longitude */
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L = M + (1.916 * sin(to_rad(M))) + (0.020 * sin (to_rad(2 * M))) + 282.634;
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while (L < 0) {
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Lx = L + 360;
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assert (Lx != L); /* askingtheguru: realy needed? */
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L = Lx;
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}
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while (L >= 360) {
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Lx = L - 360;
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assert (Lx != L); /* askingtheguru: realy needed? */
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L = Lx;
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}
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/* step 5a: calculate the sun's right ascension */
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RA = to_deg(atan(0.91764 * tan(to_rad(L))));
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while (RA < 0) {
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RAx = RA + 360;
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assert (RAx != RA); /* askingtheguru: realy needed? */
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RA = RAx;
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}
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while (RA >= 360) {
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RAx = RA - 360;
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assert (RAx != RA); /* askingtheguru: realy needed? */
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RA = RAx;
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}
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/* step 5b: right ascension value needs to be in the same quadrant as L */
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Lquadrant = floor(L / 90) * 90;
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RAquadrant = floor(RA / 90) * 90;
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RA = RA + (Lquadrant - RAquadrant);
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/* step 5c: right ascension value needs to be converted into hours */
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RA /= 15;
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/* step 6: calculate the sun's declination */
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sinDec = 0.39782 * sin(to_rad(L));
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cosDec = cos(asin(sinDec));
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/* step 7a: calculate the sun's local hour angle */
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cosH = (cos(to_rad(zenith)) - (sinDec * sin(to_rad(latitude)))) / (cosDec * cos(to_rad(latitude)));
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/* XXX: What's the use of this block.. ?
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* if (!calc_sunset && cosH > 1 || calc_sunset && cosH < -1) {
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* throw doesnthappen();
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* }
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*/
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/* step 7b: finish calculating H and convert into hours */
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if (calc_sunset) {
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H = to_deg(acos(cosH)); /* Sunset */
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} else {
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H = 360 - to_deg(acos(cosH)); /* Sunrise */
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}
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H = H / 15;
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/* step 8: calculate local mean time */
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T = H + RA - (0.06571 * t) - 6.622;
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/* step 9: convert to UTC */
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UT = T - lngHour;
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while (UT < 0) {
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UTx = UT + 24;
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assert (UTx != UT); /* askingtheguru: realy needed? */
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UT = UTx;
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}
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while (UT >= 24) {
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UTx = UT - 24;
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assert (UTx != UT); /* askingtheguru: realy needed? */
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UT = UTx;
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}
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return UT;
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}
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/* }}} */
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/* {{{ php_do_date_sunrise_sunset
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* Common for date_sunrise() and date_sunset() functions
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*/
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static void php_do_date_sunrise_sunset(INTERNAL_FUNCTION_PARAMETERS, int calc_sunset)
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{
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zval *date;
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double latitude, longitude, zenith, gmt_offset, ret;
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int time, N, retformat;
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char retstr[6];
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if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z|ldddd", &date, &retformat, &latitude, &longitude, &zenith, &gmt_offset) == FAILURE) {
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RETURN_FALSE;
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}
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switch (Z_TYPE_P(date)) {
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case IS_LONG:
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time = Z_LVAL_P(date);
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break;
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case IS_STRING:
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/* todo: more user friendly format */
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default:
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php_error_docref(NULL TSRMLS_CC, E_WARNING, "date must be timestamp for now");
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RETURN_FALSE;
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}
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N = php_idate('z', time, 0) + 1;
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switch (ZEND_NUM_ARGS()) {
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case 1:
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retformat = SUNFUNCS_RET_STRING;
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case 2:
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latitude = INI_FLT("date.default_latitude");
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case 3:
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longitude = INI_FLT("date.default_longitude");
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case 4:
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if (calc_sunset) {
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zenith = INI_FLT("date.sunset_zenith");
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} else {
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zenith = INI_FLT("date.sunrise_zenith");
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}
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case 5:
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gmt_offset = php_idate('Z', time, 0) / 3600;
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default:
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break;
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}
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ret = php_sunrise_sunset(N, latitude, longitude, zenith, calc_sunset) + gmt_offset;
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switch (retformat) {
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case SUNFUNCS_RET_TIMESTAMP:
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RETURN_LONG((int) (time - (time % (24 * 3600))) + (int) (60 * ret));
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break;
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case SUNFUNCS_RET_STRING:
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N = (int) ret;
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sprintf(retstr, "%02d:%02d", N, (int) (60 * (ret - (double) N)));
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RETVAL_STRINGL(retstr, 5, 1);
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break;
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case SUNFUNCS_RET_DOUBLE:
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RETURN_DOUBLE(ret);
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break;
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default:
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php_error_docref(NULL TSRMLS_CC, E_WARNING, "invalid format");
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RETURN_FALSE;
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}
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}
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/* }}} */
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/* {{{ proto mixed date_sunrise(mixed time [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]])
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Returns time of sunrise for a given day & location */
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PHP_FUNCTION(date_sunrise)
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{
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php_do_date_sunrise_sunset(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
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}
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/* }}} */
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/* {{{ proto mixed date_sunset(mixed time [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]])
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Returns time of sunset for a given day & location */
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PHP_FUNCTION(date_sunset)
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{
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php_do_date_sunrise_sunset(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
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}
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/* }}} */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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