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/*
* MIT License
*
* Copyright (c) 2023 Wesley Aptekar-Cassels
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "watch_utility.h"
#include "solstice_face.h"
// Find solstice or equinox time in JDE for a given year, via method from Meeus Ch 27
static double calculate_solstice_equinox(uint16_t year, uint8_t k) {
double Y = ((double)year - 2000) / 1000;
double approx_terms[4][5] = {
{2451623.80984, 365242.37404, 0.05169, -0.00411, -0.00057}, // March equinox
{2451716.56767, 365241.62603, 0.00325, 0.00888, -0.00030}, // June solstice
{2451810.21715, 365242.01767, -0.11575, 0.00337, 0.00078}, // September equinox
{2451900.05952, 365242.74049, -0.06223, -0.00823, 0.00032}, // December solstice
};
double JDE0 = approx_terms[k][0] + Y * (approx_terms[k][1] + Y * (approx_terms[k][2] + Y * (approx_terms[k][3] + Y * approx_terms[k][4])));
double T = (JDE0 - 2451545.0) / 36525;
double W = 35999.373 * T - 2.47;
double dlambda = 1 + (0.0334 * cos(W * M_PI / 180.0)) + (0.0007 * cos(2 * W * M_PI / 180.0));
double correction_terms[25][3] = {
{485,324.96,1934.136},
{203,337.23,32964.467},
{199,342.08,20.186},
{182,27.85,445267.112},
{156,73.14,45036.886},
{136,171.52,22518.443},
{77,222.54,65928.934},
{74,296.72,3034.906},
{70,243.58,9037.513},
{58,119.81,33718.147},
{52,297.17,150.678},
{50,21.02,2281.226},
{45,247.54,29929.562},
{44,325.15,31555.956},
{29,60.93,4443.417},
{18,155.12,67555.328},
{17,288.79,4562.452},
{16,198.04,62894.029},
{14,199.76,31436.921},
{12,95.39,14577.848},
{12,287.11,31931.756},
{12,320.81,34777.259},
{9,227.73,1222.114},
{8,15.45,16859.074},
};
double S = 0;
for (int i = 0; i < 25; i++) {
S += correction_terms[i][0] * cos((correction_terms[i][1] + correction_terms[i][2] * T) * M_PI / 180.0);
}
double JDE = JDE0 + (0.00001 * S) / dlambda;
return JDE;
}
// Convert JDE to Gergorian datetime as per Meeus Ch 7
static watch_date_time jde_to_date_time(double JDE) {
double tmp = JDE + 0.5;
double Z = floor(tmp);
double F = fmod(tmp, 1);
double A;
if (Z < 2299161) {
A = Z;
} else {
double alpha = floor((Z - 1867216.25) / 36524.25);
A = Z + 1 + alpha - floor(alpha / 4);
}
double B = A + 1524;
double C = floor((B - 122.1) / 365.25);
double D = floor(365.25 * C);
double E = floor((B - D) / 30.6001);
double day = B - D - floor(30.6001 * E) + F;
double month;
if (E < 14) {
month = E - 1;
} else {
month = E - 13;
}
double year;
if (month > 2) {
year = C - 4716;
} else {
year = C - 4715;
}
double hours = fmod(day, 1) * 24;
double minutes = fmod(hours, 1) * 60;
double seconds = fmod(minutes, 1) * 60;
watch_date_time result = {.unit = {
floor(seconds),
floor(minutes),
floor(hours),
floor(day),
floor(month),
floor(year - 2020)
}};
return result;
}
static void calculate_datetimes(solstice_state_t *state, movement_settings_t *settings) {
for (int i = 0; i < 4; i++) {
// TODO: handle DST changes
state->datetimes[i] = jde_to_date_time(calculate_solstice_equinox(2020 + state->year, i) + (movement_timezone_offsets[settings->bit.time_zone] / (60.0*24.0)));
}
}
void solstice_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr) {
(void) settings;
(void) watch_face_index;
if (*context_ptr == NULL) {
*context_ptr = malloc(sizeof(solstice_state_t));
solstice_state_t *state = (solstice_state_t *)*context_ptr;
watch_date_time now = watch_rtc_get_date_time();
state->year = now.unit.year;
state->index = 0;
calculate_datetimes(state, settings);
uint32_t now_unix = watch_utility_date_time_to_unix_time(now, 0);
for (int i = 0; i < 4; i++) {
if (state->index == 0 && watch_utility_date_time_to_unix_time(state->datetimes[i], 0) > now_unix) {
state->index = i;
}
}
}
}
void solstice_face_activate(movement_settings_t *settings, void *context) {
(void) settings;
(void) context;
}
static void show_main_screen(solstice_state_t *state) {
char buf[11];
watch_date_time date_time = state->datetimes[state->index];
sprintf(buf, " %2d %2d%02d", date_time.unit.year + 20, date_time.unit.month, date_time.unit.day);
watch_display_string(buf, 0);
}
static void show_date_time(movement_settings_t *settings, solstice_state_t *state) {
char buf[11];
watch_date_time date_time = state->datetimes[state->index];
if (!settings->bit.clock_mode_24h) {
if (date_time.unit.hour < 12) {
watch_clear_indicator(WATCH_INDICATOR_PM);
} else {
watch_set_indicator(WATCH_INDICATOR_PM);
}
date_time.unit.hour %= 12;
if (date_time.unit.hour == 0) date_time.unit.hour = 12;
}
sprintf(buf, "%s%2d%2d%02d%02d", watch_utility_get_weekday(date_time), date_time.unit.day, date_time.unit.hour, date_time.unit.minute, date_time.unit.second);
watch_set_colon();
watch_display_string(buf, 0);
}
bool solstice_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
solstice_state_t *state = (solstice_state_t *)context;
switch (event.event_type) {
case EVENT_ALARM_LONG_PRESS:
show_date_time(settings, state);
break;
case EVENT_LIGHT_BUTTON_UP:
if (state->index == 0) {
if (state->year == 0) {
break;
}
state->year--;
state->index = 3;
calculate_datetimes(state, settings);
} else {
state->index--;
}
show_main_screen(state);
break;
case EVENT_ALARM_BUTTON_UP:
state->index++;
if (state->index > 3) {
if (state->year == 83) {
break;
}
state->year++;
state->index = 0;
calculate_datetimes(state, settings);
}
show_main_screen(state);
break;
case EVENT_ALARM_LONG_UP:
watch_clear_colon();
watch_clear_indicator(WATCH_INDICATOR_PM);
show_main_screen(state);
break;
case EVENT_ACTIVATE:
show_main_screen(state);
break;
case EVENT_TIMEOUT:
movement_move_to_face(0);
break;
default:
return movement_default_loop_handler(event, settings);
}
return true;
}
void solstice_face_resign(movement_settings_t *settings, void *context) {
(void) settings;
(void) context;
}
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