add files

4 files changed, 244 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..34f528a
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,71 @@
+/* main.c
+ *
+ * Copyright 2024 Unknown
+ *
+ * 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, version 3 of the License only.
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "config.h"
+#include "sun.h"
+#include<math.h>
+
+#include <glib.h>
+#include <stdlib.h>
+
+gint
+main (gint   argc,
+      gchar *argv[])
+{
+	g_autoptr(GOptionContext) context = NULL;
+	g_autoptr(GError) error = NULL;
+	gboolean version = FALSE;
+	GOptionEntry main_entries[] = {
+		{ "version", 0, 0, G_OPTION_ARG_NONE, &version, "Show program version" },
+		{ NULL }
+	};
+
+	context = g_option_context_new ("- my command line tool");
+	g_option_context_add_main_entries (context, main_entries, NULL);
+
+	if (!g_option_context_parse (context, &argc, &argv, &error))
+	{
+		g_printerr ("%s\n", error->message);
+		return EXIT_FAILURE;
+	}
+
+	if (version)
+	{
+		g_printerr ("%s\n", PACKAGE_VERSION);
+		return EXIT_SUCCESS;
+	}
+
+        int year = 2024, month = 5, day = 28;
+        double latitude = 51.01;
+        double longitude = 7.563;
+
+        float localT = calculateSunrise(year, month, day, latitude, longitude, 2);
+        double hours;
+        float minutes = modf(localT,&hours)*60;
+        g_print("Sunrise: %.0f:%.0f\n",hours,minutes);
+
+        float sunsetT = calculateSunset(year, month, day, latitude, longitude, 2);
+        double sunHours;
+        float sunMinutes = modf(sunsetT,&sunHours)*60;
+        g_print("Sunset: %.0f:%.0f\n",sunHours,sunMinutes);
+
+        return 0;
+
+	return EXIT_SUCCESS;
+}
diff --git a/src/meson.build b/src/meson.build
new file mode 100644
index 0000000..4848423
--- /dev/null
+++ b/src/meson.build
@@ -0,0 +1,15 @@
+autodarkmode_sources = [
+  'main.c',
+  'sun.c'
+]
+
+autodarkmode_deps = [
+  dependency('glib-2.0'),
+]
+
+executable('autodarkmode', autodarkmode_sources,
+  dependencies: autodarkmode_deps,
+  install: true,
+  link_args: '-lm',
+)
+
diff --git a/src/sun.c b/src/sun.c
new file mode 100644
index 0000000..f08dfd8
--- /dev/null
+++ b/src/sun.c
@@ -0,0 +1,156 @@
+#include <math.h>
+#include <glib.h>
+#define PI 3.1415926
+#define ZENITH -.83
+
+float calculateSunrise(int year,int month,int day,float lat, float lng,int localOffset) {
+    /*
+    localOffset will be <0 for western hemisphere and >0 for eastern hemisphere
+    daylightSavings should be 1 if it is in effect during the summer otherwise it should be 0
+    */
+    //1. first calculate the day of the year
+    float N1 = floor(275 * month / 9);
+    float N2 = floor((month + 9) / 12);
+    float N3 = (1 + floor((year - 4 * floor(year / 4) + 2) / 3));
+    float N = N1 - (N2 * N3) + day - 30;
+
+    //2. convert the longitude to hour value and calculate an approximate time
+    float lngHour = lng / 15.0;
+    float t = N + ((6 - lngHour) / 24);
+
+    //3. calculate the Sun's mean anomaly
+    float M = (0.9856 * t) - 3.289;
+
+    //4. calculate the Sun's true longitude
+    float L = fmod(M + (1.916 * sin((PI/180)*M)) + (0.020 * sin(2 *(PI/180) * M)) + 282.634,360.0);
+
+    if ( L < 0 )
+      L = L+360;
+    else if ( L > 360)
+      L = L-360;
+
+    //5a. calculate the Sun's right ascension
+    float RA = fmod(180/PI*atan(0.91764 * tan((PI/180)*L)),360.0);
+
+    if ( RA < 0 )
+      RA = RA+360;
+    else if ( RA > 360)
+      RA = RA-360;
+
+    //5b. right ascension value needs to be in the same quadrant as L
+    float Lquadrant  = floor( L/90) * 90;
+    float RAquadrant = floor(RA/90) * 90;
+    RA = RA + (Lquadrant - RAquadrant);
+
+    //5c. right ascension value needs to be converted into hours
+    RA = RA / 15;
+
+    //6. calculate the Sun's declination
+    float sinDec = 0.39782 * sin((PI/180)*L);
+    float cosDec = cos(asin(sinDec));
+
+    //7a. calculate the Sun's local hour angle
+    float cosH = (sin((PI/180)*ZENITH) - (sinDec * sin((PI/180)*lat))) / (cosDec * cos((PI/180)*lat));
+
+    if (cosH >  1)
+      g_print("Never rising\n");
+    else if (cosH < -1)
+      g_print("Never setting\n");
+
+    //7b. finish calculating H and convert into hours
+    float H = 360 - (180/PI)*acos(cosH);   //   if if rising time is desired:
+
+    H = H / 15;
+
+    //8. calculate local mean time of rising/setting
+    float T = H + RA - (0.06571 * t) - 6.622;
+
+    //9. adjust back to UTC
+    float UT = fmod(T - lngHour,24.0);
+
+    if ( UT < 0 )
+      UT = UT+24;
+    else if (UT > 24)
+      UT = UT-24;
+
+    //10. convert UT value to local time zone of latitude/longitude
+    return UT + localOffset;
+
+    }
+
+float calculateSunset(int year,int month,int day,float lat, float lng,int localOffset) {
+   /*
+    localOffset will be <0 for western hemisphere and >0 for eastern hemisphere
+    daylightSavings should be 1 if it is in effect during the summer otherwise it should be 0
+    */
+    //1. first calculate the day of the year
+    float N1 = floor(275 * month / 9);
+    float N2 = floor((month + 9) / 12);
+    float N3 = (1 + floor((year - 4 * floor(year / 4) + 2) / 3));
+    float N = N1 - (N2 * N3) + day - 30;
+
+    //2. convert the longitude to hour value and calculate an approximate time
+    float lngHour = lng / 15.0;
+
+    float t = N + ((18 - lngHour) / 24);   //if setting time is desired:
+
+    //3. calculate the Sun's mean anomaly
+    float M = (0.9856 * t) - 3.289;
+
+    //4. calculate the Sun's true longitude
+    float L = fmod(M + (1.916 * sin((PI/180)*M)) + (0.020 * sin(2 *(PI/180) * M)) + 282.634,360.0);
+
+    if ( L < 0 )
+      L = L+360;
+    else if ( L > 360)
+      L = L-360;
+
+    //5a. calculate the Sun's right ascension
+    float RA = fmod(180/PI*atan(0.91764 * tan((PI/180)*L)),360.0);
+
+    if ( RA < 0 )
+      RA = RA+360;
+    else if ( RA > 360)
+      RA = RA-360;
+
+    //5b. right ascension value needs to be in the same quadrant as L
+    float Lquadrant  = floor( L/90) * 90;
+    float RAquadrant = floor(RA/90) * 90;
+    RA = RA + (Lquadrant - RAquadrant);
+
+    //5c. right ascension value needs to be converted into hours
+    RA = RA / 15;
+
+    //6. calculate the Sun's declination
+    float sinDec = 0.39782 * sin((PI/180)*L);
+    float cosDec = cos(asin(sinDec));
+
+    //7a. calculate the Sun's local hour angle
+    float cosH = (sin((PI/180)*ZENITH) - (sinDec * sin((PI/180)*lat))) / (cosDec * cos((PI/180)*lat));
+
+    if (cosH >  1)
+      g_print("Never rising\n");
+    else if (cosH < -1)
+      g_print("Never setting\n");
+
+
+    //7b. finish calculating H and convert into hours
+
+    float H = (180/PI)*acos(cosH); //   if setting time is desired:
+    H = H / 15;
+
+    //8. calculate local mean time of rising/setting
+    float T = H + RA - (0.06571 * t) - 6.622;
+
+    //9. adjust back to UTC
+    float UT = fmod(T - lngHour,24.0);
+
+    if ( UT < 0 )
+      UT = UT+24;
+    else if (UT > 24)
+      UT = UT-24;
+
+    //10. convert UT value to local time zone of latitude/longitude
+    return UT + localOffset;
+
+}
diff --git a/src/sun.h b/src/sun.h
new file mode 100644
index 0000000..0eeb187
--- /dev/null
+++ b/src/sun.h
@@ -0,0 +1,2 @@
+float calculateSunrise(int year,int month,int day,float lat, float lng,int localOffset);
+float calculateSunset(int year,int month,int day,float lat, float lng,int localOffset);