a9d503b807
The DST code has not yet been fully tested, the upcoming movement refactor is upon us and it will integrate with the micro timezone library anyway. Revert it so that next can be merged into main. This reverts commit ac5bf8cfce67cdb5662aeea618c2eb9511f0d190, reversing changes made to 5a8a49a8c77d6d5ba0f46f0e5b51dec2daba46db.
237 lines
8.0 KiB
C
237 lines
8.0 KiB
C
/*
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* MIT License
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*
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* Copyright (c) 2023 Wesley Aptekar-Cassels
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "watch_utility.h"
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#include "solstice_face.h"
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// Find solstice or equinox time in JDE for a given year, via method from Meeus Ch 27
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static double calculate_solstice_equinox(uint16_t year, uint8_t k) {
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double Y = ((double)year - 2000) / 1000;
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double approx_terms[4][5] = {
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{2451623.80984, 365242.37404, 0.05169, -0.00411, -0.00057}, // March equinox
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{2451716.56767, 365241.62603, 0.00325, 0.00888, -0.00030}, // June solstice
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{2451810.21715, 365242.01767, -0.11575, 0.00337, 0.00078}, // September equinox
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{2451900.05952, 365242.74049, -0.06223, -0.00823, 0.00032}, // December solstice
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};
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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])));
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double T = (JDE0 - 2451545.0) / 36525;
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double W = 35999.373 * T - 2.47;
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double dlambda = 1 + (0.0334 * cos(W * M_PI / 180.0)) + (0.0007 * cos(2 * W * M_PI / 180.0));
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double correction_terms[25][3] = {
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{485,324.96,1934.136},
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{203,337.23,32964.467},
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{199,342.08,20.186},
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{182,27.85,445267.112},
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{156,73.14,45036.886},
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{136,171.52,22518.443},
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{77,222.54,65928.934},
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{74,296.72,3034.906},
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{70,243.58,9037.513},
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{58,119.81,33718.147},
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{52,297.17,150.678},
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{50,21.02,2281.226},
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{45,247.54,29929.562},
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{44,325.15,31555.956},
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{29,60.93,4443.417},
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{18,155.12,67555.328},
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{17,288.79,4562.452},
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{16,198.04,62894.029},
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{14,199.76,31436.921},
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{12,95.39,14577.848},
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{12,287.11,31931.756},
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{12,320.81,34777.259},
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{9,227.73,1222.114},
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{8,15.45,16859.074},
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};
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double S = 0;
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for (int i = 0; i < 25; i++) {
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S += correction_terms[i][0] * cos((correction_terms[i][1] + correction_terms[i][2] * T) * M_PI / 180.0);
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}
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double JDE = JDE0 + (0.00001 * S) / dlambda;
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return JDE;
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}
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// Convert JDE to Gergorian datetime as per Meeus Ch 7
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static watch_date_time jde_to_date_time(double JDE) {
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double tmp = JDE + 0.5;
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double Z = floor(tmp);
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double F = fmod(tmp, 1);
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double A;
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if (Z < 2299161) {
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A = Z;
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} else {
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double alpha = floor((Z - 1867216.25) / 36524.25);
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A = Z + 1 + alpha - floor(alpha / 4);
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}
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double B = A + 1524;
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double C = floor((B - 122.1) / 365.25);
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double D = floor(365.25 * C);
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double E = floor((B - D) / 30.6001);
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double day = B - D - floor(30.6001 * E) + F;
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double month;
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if (E < 14) {
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month = E - 1;
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} else {
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month = E - 13;
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}
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double year;
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if (month > 2) {
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year = C - 4716;
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} else {
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year = C - 4715;
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}
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double hours = fmod(day, 1) * 24;
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double minutes = fmod(hours, 1) * 60;
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double seconds = fmod(minutes, 1) * 60;
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watch_date_time result = {.unit = {
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floor(seconds),
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floor(minutes),
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floor(hours),
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floor(day),
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floor(month),
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floor(year - 2020)
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}};
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return result;
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}
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static void calculate_datetimes(solstice_state_t *state, movement_settings_t *settings) {
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for (int i = 0; i < 4; i++) {
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// TODO: handle DST changes
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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)));
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}
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}
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void solstice_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr) {
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(void) settings;
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(void) watch_face_index;
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if (*context_ptr == NULL) {
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*context_ptr = malloc(sizeof(solstice_state_t));
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solstice_state_t *state = (solstice_state_t *)*context_ptr;
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watch_date_time now = watch_rtc_get_date_time();
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state->year = now.unit.year;
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state->index = 0;
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calculate_datetimes(state, settings);
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uint32_t now_unix = watch_utility_date_time_to_unix_time(now, 0);
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for (int i = 0; i < 4; i++) {
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if (state->index == 0 && watch_utility_date_time_to_unix_time(state->datetimes[i], 0) > now_unix) {
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state->index = i;
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}
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}
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}
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}
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void solstice_face_activate(movement_settings_t *settings, void *context) {
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(void) settings;
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(void) context;
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}
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static void show_main_screen(solstice_state_t *state) {
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char buf[11];
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watch_date_time date_time = state->datetimes[state->index];
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sprintf(buf, " %2d %2d%02d", date_time.unit.year + 20, date_time.unit.month, date_time.unit.day);
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watch_display_string(buf, 0);
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}
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static void show_date_time(movement_settings_t *settings, solstice_state_t *state) {
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char buf[11];
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watch_date_time date_time = state->datetimes[state->index];
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if (!settings->bit.clock_mode_24h) {
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if (date_time.unit.hour < 12) {
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watch_clear_indicator(WATCH_INDICATOR_PM);
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} else {
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watch_set_indicator(WATCH_INDICATOR_PM);
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}
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date_time.unit.hour %= 12;
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if (date_time.unit.hour == 0) date_time.unit.hour = 12;
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}
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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);
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watch_set_colon();
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watch_display_string(buf, 0);
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}
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bool solstice_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
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solstice_state_t *state = (solstice_state_t *)context;
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switch (event.event_type) {
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case EVENT_ALARM_LONG_PRESS:
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show_date_time(settings, state);
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break;
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case EVENT_LIGHT_BUTTON_UP:
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if (state->index == 0) {
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if (state->year == 0) {
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break;
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}
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state->year--;
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state->index = 3;
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calculate_datetimes(state, settings);
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} else {
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state->index--;
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}
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show_main_screen(state);
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break;
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case EVENT_ALARM_BUTTON_UP:
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state->index++;
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if (state->index > 3) {
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if (state->year == 83) {
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break;
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}
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state->year++;
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state->index = 0;
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calculate_datetimes(state, settings);
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}
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show_main_screen(state);
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break;
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case EVENT_ALARM_LONG_UP:
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watch_clear_colon();
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watch_clear_indicator(WATCH_INDICATOR_PM);
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show_main_screen(state);
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break;
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case EVENT_ACTIVATE:
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show_main_screen(state);
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break;
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case EVENT_TIMEOUT:
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movement_move_to_face(0);
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break;
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default:
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return movement_default_loop_handler(event, settings);
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}
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return true;
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}
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void solstice_face_resign(movement_settings_t *settings, void *context) {
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(void) settings;
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(void) context;
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}
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