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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2004 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.0 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_0.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Moshe Doron <mosdoron@netvision.net.il> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
/*
The sun position algorithm taken from the 'US Naval Observatory's
Almanac for Computers', implemented by Ken Bloom <kekabloom@ucdavis.edu>
for the zmanim project <http://sourceforge.net/projects/zmanim/>
and finally converted to C by Moshe Doron <mosdoron@netvision.net.il>.
*/
#include "php.h"
#include "php_sunfuncs.h"
#include "datetime.h"
#include "php_ini.h"
#include <assert.h>
#include <math.h>
#include <stdlib.h>
/* {{{ macros and constants
*/
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#define to_rad(degrees) (degrees * M_PI / 180)
#define to_rad_with_min(degrees) (degrees + minutes / 60)
#define to_deg(rad) (rad * 180 / M_PI)
/* }}} */
/* {{{ php_sunrise_sunset
returns time in UTC */
static double php_sunrise_sunset(long N, double latitude, double longitude, double zenith, int calc_sunset)
{
double lngHour, t, M, L, Lx, RA, RAx, Lquadrant, RAquadrant, sinDec, cosDec, cosH, H, T, UT, UTx;
/* step 1: First calculate the day of the year
int N = theday - date(1, 1, theday.year()) + 1;
*/
/* step 2: convert the longitude to hour value and calculate an approximate time */
lngHour = longitude / 15;
/* use 18 for sunset instead of 6 */
if (calc_sunset) {
t = (double) N + ((18 - lngHour) / 24); /* Sunset */
} else {
t = (double) N + ((6 - lngHour) / 24); /* Sunrise */
}
/* step 3: calculate the sun's mean anomaly */
M = (0.9856 * t) - 3.289;
/* step 4: calculate the sun's true longitude */
L = M + (1.916 * sin(to_rad(M))) + (0.020 * sin (to_rad(2 * M))) + 282.634;
while (L < 0) {
Lx = L + 360;
assert (Lx != L); /* askingtheguru: realy needed? */
L = Lx;
}
while (L >= 360) {
Lx = L - 360;
assert (Lx != L); /* askingtheguru: realy needed? */
L = Lx;
}
/* step 5a: calculate the sun's right ascension */
RA = to_deg(atan(0.91764 * tan(to_rad(L))));
while (RA < 0) {
RAx = RA + 360;
assert (RAx != RA); /* askingtheguru: realy needed? */
RA = RAx;
}
while (RA >= 360) {
RAx = RA - 360;
assert (RAx != RA); /* askingtheguru: realy needed? */
RA = RAx;
}
/* step 5b: right ascension value needs to be in the same quadrant as L */
Lquadrant = floor(L / 90) * 90;
RAquadrant = floor(RA / 90) * 90;
RA = RA + (Lquadrant - RAquadrant);
/* step 5c: right ascension value needs to be converted into hours */
RA /= 15;
/* step 6: calculate the sun's declination */
sinDec = 0.39782 * sin(to_rad(L));
cosDec = cos(asin(sinDec));
/* step 7a: calculate the sun's local hour angle */
cosH = (cos(to_rad(zenith)) - (sinDec * sin(to_rad(latitude)))) / (cosDec * cos(to_rad(latitude)));
/* XXX: What's the use of this block.. ?
* if (!calc_sunset && cosH > 1 || calc_sunset && cosH < -1) {
* throw doesnthappen();
* }
*/
/* step 7b: finish calculating H and convert into hours */
if (calc_sunset) {
H = to_deg(acos(cosH)); /* Sunset */
} else {
H = 360 - to_deg(acos(cosH)); /* Sunrise */
}
H = H / 15;
/* step 8: calculate local mean time */
T = H + RA - (0.06571 * t) - 6.622;
/* step 9: convert to UTC */
UT = T - lngHour;
while (UT < 0) {
UTx = UT + 24;
assert (UTx != UT); /* askingtheguru: realy needed? */
UT = UTx;
}
while (UT >= 24) {
UTx = UT - 24;
assert (UTx != UT); /* askingtheguru: realy needed? */
UT = UTx;
}
return UT;
}
/* }}} */
/* {{{ php_do_date_sunrise_sunset
* Common for date_sunrise() and date_sunset() functions
*/
static void php_do_date_sunrise_sunset(INTERNAL_FUNCTION_PARAMETERS, int calc_sunset)
{
zval *date;
double latitude, longitude, zenith, gmt_offset, ret;
int time, N;
long retformat;
char retstr[6];
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z|ldddd", &date, &retformat, &latitude, &longitude, &zenith, &gmt_offset) == FAILURE) {
RETURN_FALSE;
}
switch (Z_TYPE_P(date)) {
case IS_LONG:
time = Z_LVAL_P(date);
break;
case IS_STRING:
/* todo: more user friendly format */
default:
php_error_docref(NULL TSRMLS_CC, E_WARNING, "date must be timestamp for now");
RETURN_FALSE;
}
N = php_idate('z', time, 0) + 1;
switch (ZEND_NUM_ARGS()) {
case 1:
retformat = SUNFUNCS_RET_STRING;
case 2:
latitude = INI_FLT("date.default_latitude");
case 3:
longitude = INI_FLT("date.default_longitude");
case 4:
if (calc_sunset) {
zenith = INI_FLT("date.sunset_zenith");
} else {
zenith = INI_FLT("date.sunrise_zenith");
}
case 5:
gmt_offset = php_idate('Z', time, 0) / 3600;
case 6:
break;
default:
php_error_docref(NULL TSRMLS_CC, E_WARNING, "invalid format");
RETURN_FALSE;
break;
}
ret = php_sunrise_sunset(N, latitude, longitude, zenith, calc_sunset) + gmt_offset;
switch (retformat) {
case SUNFUNCS_RET_TIMESTAMP:
RETURN_LONG((int) (time - (time % (24 * 3600))) + (int) (3600 * ret));
break;
case SUNFUNCS_RET_STRING:
N = (int) ret;
sprintf(retstr, "%02d:%02d", N, (int) (60 * (ret - (double) N)));
RETVAL_STRINGL(retstr, 5, 1);
break;
case SUNFUNCS_RET_DOUBLE:
RETURN_DOUBLE(ret);
break;
}
}
/* }}} */
/* {{{ proto mixed date_sunrise(mixed time [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]])
Returns time of sunrise for a given day and location */
PHP_FUNCTION(date_sunrise)
{
php_do_date_sunrise_sunset(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */
/* {{{ proto mixed date_sunset(mixed time [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]])
Returns time of sunset for a given day and location */
PHP_FUNCTION(date_sunset)
{
php_do_date_sunrise_sunset(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
|
