Raffael Mancini
235 lines
8.5 KiB
C
235 lines
8.5 KiB
C
/*
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* MIT License
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*
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* Copyright (c) 2025 Raffael Mancini
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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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* Solar time formulas follow the notation from:
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* https://www.pveducation.org/pvcdrom/properties-of-sunlight/solar-time
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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 "solar_time_face.h"
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#include "watch.h"
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#include "watch_utility.h"
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#include "filesystem.h"
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#if __EMSCRIPTEN__
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#include <emscripten.h>
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#endif
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#ifndef M_PI
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#define M_PI 3.14159265358979323846f
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#endif
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/* ---------------------------------------------------------------------------
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* Solar time math (pveducation.org notation)
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* ---------------------------------------------------------------------------
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*
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* LSTM = 15 * ΔTUTC [degrees]
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* B = (360 / 365) * (d - 81) [degrees] d = day-of-year
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* EoT = 9.87*sin(2B) - 7.53*cos(B)
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* - 1.5*sin(B) [minutes]
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* TC = 4 * (Longitude - LSTM) + EoT [minutes]
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* LST = LT + TC/60 [hours]
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* HRA = 15 * (LST - 12) [degrees]
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* ---------------------------------------------------------------------------
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*/
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static movement_location_t _load_location(void) {
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movement_location_t loc = {0};
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filesystem_read_file("location.u32", (char *)&loc.reg, sizeof(loc.reg));
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return loc;
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}
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/* Compute and cache EoT and TC. Call when d != state->last_calc_d. */
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static void _compute_daily(solar_time_state_t *state, uint16_t d) {
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/* LSTM — movement_get_current_timezone_offset() returns seconds from UTC */
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float delta_T_UTC = (float)movement_get_current_timezone_offset() / 3600.0f;
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float LSTM = 15.0f * delta_T_UTC;
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movement_location_t loc = _load_location();
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float longitude = (float)(int16_t)loc.bit.longitude / 100.0f;
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/* B in radians for sinf/cosf */
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float B = (360.0f / 365.0f) * ((float)d - 81.0f) * ((float)M_PI / 180.0f);
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state->EoT = 9.87f * sinf(2.0f * B) - 7.53f * cosf(B) - 1.5f * sinf(B);
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state->TC = 4.0f * (longitude - LSTM) + state->EoT;
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state->last_calc_d = d;
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}
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/* Recompute if the day-of-year has rolled over. Returns current d. */
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static uint16_t _maybe_recompute(solar_time_state_t *state, watch_date_time_t dt) {
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uint16_t d = watch_utility_days_since_new_year(
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(uint16_t)(dt.unit.year + WATCH_RTC_REFERENCE_YEAR),
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dt.unit.month,
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dt.unit.day
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);
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if (d != state->last_calc_d && _load_location().reg != 0) {
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_compute_daily(state, d);
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}
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return d;
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}
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/* LST as total seconds since midnight (0..86399).
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* LST = LT + TC/60 => in seconds: LT_sec + TC*60 */
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static int32_t _lst_seconds(watch_date_time_t dt, float TC) {
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int32_t lt = (int32_t)dt.unit.hour * 3600
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+ (int32_t)dt.unit.minute * 60
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+ (int32_t)dt.unit.second;
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int32_t tc = (int32_t)(TC * 60.0f);
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return ((lt + tc) % 86400 + 86400) % 86400;
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}
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static void _update_display(solar_time_state_t *state, watch_date_time_t dt) {
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char bottom[7];
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if (_load_location().reg == 0) {
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watch_display_text_with_fallback(WATCH_POSITION_TOP_LEFT, "SOL", "SO");
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watch_display_text(WATCH_POSITION_TOP_RIGHT, " ");
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watch_display_text(WATCH_POSITION_BOTTOM, "no Loc");
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watch_clear_colon();
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return;
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}
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switch (state->mode) {
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case SOLAR_TIME_MODE_LST: {
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int32_t s = _lst_seconds(dt, state->TC);
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watch_display_text_with_fallback(WATCH_POSITION_TOP_LEFT, "SOL", "SO");
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sprintf(bottom, "%02d%02d%02d",
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(int)(s / 3600), (int)((s % 3600) / 60), (int)(s % 60));
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watch_set_colon();
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break;
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}
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case SOLAR_TIME_MODE_NOON: {
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/* Solar noon: moment when LST = 12:00 → LT_noon = 12h - TC/60 */
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int32_t s = (int32_t)(( 12.0f - state->TC / 60.0f) * 3600.0f);
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s = ((s % 86400) + 86400) % 86400;
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watch_display_text_with_fallback(WATCH_POSITION_TOP_LEFT, "NOO", "nO");
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sprintf(bottom, "%02d%02d ", (int)(s / 3600), (int)((s % 3600) / 60));
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watch_set_colon();
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break;
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}
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case SOLAR_TIME_MODE_HRA: {
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/* HRA = 15 * (LST - 12); negative = morning, positive = afternoon */
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int32_t s = _lst_seconds(dt, state->TC);
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int16_t hra = (int16_t)roundf(15.0f * ((float)s / 3600.0f - 12.0f));
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watch_display_text_with_fallback(WATCH_POSITION_TOP_LEFT, "HrA", "Hr");
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sprintf(bottom, "%+4d ", (int)hra);
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watch_clear_colon();
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break;
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}
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default:
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return;
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}
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watch_display_text(WATCH_POSITION_TOP_RIGHT, " ");
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watch_display_text(WATCH_POSITION_BOTTOM, bottom);
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}
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/* ---- Movement callbacks -------------------------------------------------- */
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void solar_time_face_setup(uint8_t watch_face_index, void **context_ptr) {
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(void)watch_face_index;
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if (*context_ptr == NULL) {
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*context_ptr = malloc(sizeof(solar_time_state_t));
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memset(*context_ptr, 0, sizeof(solar_time_state_t));
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/* last_calc_d == 0 guarantees recomputation on first tick */
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}
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}
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void solar_time_face_activate(void *context) {
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solar_time_state_t *state = (solar_time_state_t *)context;
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#if __EMSCRIPTEN__
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/* In the simulator the browser exposes lat/lon as JS globals.
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* Write them to location.u32 if not already set. */
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int16_t browser_lat = EM_ASM_INT({ return lat; });
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int16_t browser_lon = EM_ASM_INT({ return lon; });
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if (browser_lat || browser_lon) {
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movement_location_t browser_loc = {0};
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filesystem_read_file("location.u32", (char *)&browser_loc.reg, sizeof(browser_loc.reg));
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if (browser_loc.reg == 0) {
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browser_loc.bit.latitude = browser_lat;
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browser_loc.bit.longitude = browser_lon;
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filesystem_write_file("location.u32", (char *)&browser_loc.reg, sizeof(browser_loc.reg));
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}
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}
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#endif
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/* Force recompute on activation: timezone or location may have changed */
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state->last_calc_d = 0;
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watch_date_time_t dt = movement_get_local_date_time();
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_maybe_recompute(state, dt);
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}
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bool solar_time_face_loop(movement_event_t event, void *context) {
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solar_time_state_t *state = (solar_time_state_t *)context;
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switch (event.event_type) {
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case EVENT_ACTIVATE:
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case EVENT_TICK: {
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watch_date_time_t dt = movement_get_local_date_time();
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_maybe_recompute(state, dt);
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_update_display(state, dt);
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break;
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}
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case EVENT_ALARM_BUTTON_UP:
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state->mode = (solar_time_mode_t)((state->mode + 1) % SOLAR_TIME_NUM_MODES);
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{
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watch_date_time_t dt = movement_get_local_date_time();
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_update_display(state, dt);
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}
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break;
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case EVENT_LOW_ENERGY_UPDATE: {
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if (!watch_sleep_animation_is_running()) watch_start_sleep_animation(1000);
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watch_date_time_t dt = movement_get_local_date_time();
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_maybe_recompute(state, dt);
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_update_display(state, dt);
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break;
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}
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case EVENT_TIMEOUT:
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state->mode = SOLAR_TIME_MODE_LST;
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if (_load_location().reg == 0) 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);
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}
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return true;
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}
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void solar_time_face_resign(void *context) {
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solar_time_state_t *state = (solar_time_state_t *)context;
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state->mode = SOLAR_TIME_MODE_LST;
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watch_clear_colon();
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}
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