kopia lustrzana https://gitlab.com/Zwarf/picplanner
165 wiersze
6.0 KiB
C
165 wiersze
6.0 KiB
C
/*
|
|
* calculations_milky_way.c
|
|
* Copyright (C) 2021 Zwarf <zwarf@mail.de>
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
#include "calculations_milky_way.h"
|
|
|
|
/*
|
|
* Get the rotational coordinates of the milky way.
|
|
* Due to the nearly stationary stars, the rotational coordinates are fixed coordinates.
|
|
*/
|
|
double
|
|
*picplanner_get_coordinates_rotational_milky_way (void)
|
|
{
|
|
double right_ascension = 266.417;
|
|
double declination = -29.008;
|
|
double *coordinates_rotational = malloc (sizeof (double) * 2);
|
|
|
|
coordinates_rotational[0] = right_ascension;
|
|
coordinates_rotational[1] = declination;
|
|
|
|
return coordinates_rotational;
|
|
}
|
|
|
|
|
|
/*
|
|
* Calculate the horizontal coordinates of the milky way for a given time and position.
|
|
*/
|
|
double
|
|
*picplanner_get_coordinates_milky_way (GDateTime *date_time,
|
|
double longitude,
|
|
double latitude)
|
|
{
|
|
double siderial_time;
|
|
g_autofree double *coordinates_milky_way = NULL;
|
|
double *coordinates_horizontal_milky_way;
|
|
|
|
coordinates_milky_way = picplanner_get_coordinates_rotational_milky_way ();
|
|
siderial_time = time_jd_to_sidereal_time (longitude, date_time);
|
|
coordinates_horizontal_milky_way = picplanner_transform_rotational_to_horizontal(coordinates_milky_way,
|
|
latitude,
|
|
siderial_time);
|
|
|
|
return coordinates_horizontal_milky_way;
|
|
}
|
|
|
|
|
|
/*
|
|
* Calculate the horizontal coordinates of the milky way for a given time
|
|
* and position for a whole day.
|
|
*/
|
|
double
|
|
*picplanner_get_array_coordinates_milky_way (GDateTime *date_time,
|
|
double longitude,
|
|
double latitude)
|
|
{
|
|
double *array_coordinates_milky_way = malloc (sizeof (double) * 2 * NUM_DATA_POINTS);
|
|
|
|
for (int i=0; i<NUM_DATA_POINTS; i++)
|
|
{
|
|
g_autoptr (GDateTime) iteration_time =
|
|
g_date_time_add_minutes (date_time, i*24*60/NUM_DATA_POINTS-12*60);
|
|
g_autofree double *coordinates_milky_way =
|
|
picplanner_get_coordinates_milky_way (iteration_time,
|
|
longitude,
|
|
latitude);
|
|
|
|
array_coordinates_milky_way[2*i] = coordinates_milky_way[0];
|
|
array_coordinates_milky_way[2*i+1] = coordinates_milky_way[1];
|
|
}
|
|
|
|
return array_coordinates_milky_way;
|
|
}
|
|
|
|
|
|
/*
|
|
* Chencks if the milky way is disturbed by the sun or moon.
|
|
* The definition of "disturbe" can be specified through the angles.
|
|
* 'angle_sun' defines below which angle no disturbance happens by the sun.
|
|
* 'angle_moon' defines below which angle no disturbance happens by the moon.
|
|
* 'angle_milky_way' defines above which angle the milky way is visible.
|
|
*/
|
|
char
|
|
*picplanner_get_char_disturbance (GDateTime *date_time,
|
|
double angle_sun,
|
|
double angle_moon,
|
|
double angle_milky_way,
|
|
double *coordinates_array_sun,
|
|
double *coordinates_array_moon,
|
|
double *coordinates_array_milky_way)
|
|
{
|
|
int no_disturbance_count = 0;
|
|
char *char_no_disturbance = NULL;
|
|
gboolean no_disturbance_now = FALSE;
|
|
GDateTime *date_time_disturbance = g_date_time_new_now_local ();
|
|
|
|
for (int i=0; i<NUM_DATA_POINTS; i++)
|
|
{
|
|
if (coordinates_array_sun[i*2+1]<angle_sun &&
|
|
coordinates_array_moon[i*2+1]<angle_moon &&
|
|
coordinates_array_milky_way[i*2+1]>angle_milky_way)
|
|
{
|
|
if (!no_disturbance_now)
|
|
{
|
|
no_disturbance_now = TRUE;
|
|
picplanner_get_date_time_from_index (&date_time_disturbance, &date_time, i);
|
|
if (no_disturbance_count == 0)
|
|
{
|
|
char_no_disturbance = g_strdup_printf ("%02d:%02d -",
|
|
g_date_time_get_hour (date_time_disturbance),
|
|
g_date_time_get_minute (date_time_disturbance));
|
|
}
|
|
else
|
|
{
|
|
char_no_disturbance = g_strdup_printf ("%s & %02d:%02d -",
|
|
char_no_disturbance,
|
|
g_date_time_get_hour (date_time_disturbance),
|
|
g_date_time_get_minute (date_time_disturbance));
|
|
}
|
|
no_disturbance_count++;
|
|
}
|
|
else
|
|
{
|
|
if (i==NUM_DATA_POINTS-1)
|
|
{
|
|
char_no_disturbance = g_strdup_printf ("%s 23:59", char_no_disturbance);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (no_disturbance_now)
|
|
{
|
|
no_disturbance_now = FALSE;
|
|
picplanner_get_date_time_from_index (&date_time_disturbance, &date_time, i);
|
|
char_no_disturbance = g_strdup_printf ("%s %02d:%02d",
|
|
char_no_disturbance,
|
|
g_date_time_get_hour (date_time_disturbance),
|
|
g_date_time_get_minute (date_time_disturbance));
|
|
}
|
|
}
|
|
}
|
|
|
|
if (char_no_disturbance == NULL)
|
|
char_no_disturbance = g_strdup_printf ("--:-- - --:--");
|
|
|
|
g_date_time_unref (date_time_disturbance);
|
|
|
|
return char_no_disturbance;
|
|
}
|