add local decimal time (Kè) face

movement_faces.h

@@ -61,4 +61,5 @@
 #include "totp_face.h"
 #include "tally_face.h"
 #include "probability_face.h"
+#include "ke_decimal_time_face.h"
 // New includes go above this line.

watch-faces.mk

@@ -36,4 +36,5 @@ SRCS += \
   ./watch-faces/complication/tarot_face.c \
   ./watch-faces/complication/kitchen_conversions_face.c \
   ./watch-faces/complication/periodic_table_face.c \
+  ./watch-faces/clock/ke_decimal_time_face.c \
 # New watch faces go above this line.

watch-faces/clock/ke_decimal_time_face.c

@@ -0,0 +1,142 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2025 Joey Castillo
+ *
+ * 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 "ke_decimal_time_face.h"
+#include "watch_utility.h"
+
+static void _display_date(watch_date_time_t date_time) {
+    char buf[3];
+
+    watch_display_text_with_fallback(WATCH_POSITION_TOP_LEFT, watch_utility_get_long_weekday(date_time), watch_utility_get_weekday(date_time));
+    snprintf(buf, sizeof(buf), "%2d", date_time.unit.day);
+    watch_display_text(WATCH_POSITION_TOP_RIGHT, buf);
+}
+
+static void _display_time(ke_decimal_time_state_t *state, watch_date_time_t date_time, bool low_energy) {
+    char buf[7];
+    uint32_t value = date_time.unit.hour * 3600 + date_time.unit.minute * 60 + date_time.unit.second;
+
+    if (value == state->previous_time) return;
+
+    value = value * 100;
+    value = value / 864;
+    snprintf(buf, sizeof(buf), "%04d#o", value);
+
+    // if under 10%, display 0.00 instead of 00.00
+    if (value < 1000) buf[0] = ' ';
+
+    // if low energy, truncate at the tens place
+    if (low_energy) buf[3] = 0;
+
+    watch_display_text(WATCH_POSITION_BOTTOM, buf);
+
+    state->previous_time = value;
+}
+
+void ke_decimal_time_face_setup(uint8_t watch_face_index, void ** context_ptr) {
+    (void) watch_face_index;
+    if (*context_ptr == NULL) {
+        *context_ptr = malloc(sizeof(ke_decimal_time_state_t));
+        memset(*context_ptr, 0, sizeof(ke_decimal_time_state_t));
+        // Do any one-time tasks in here; the inside of this conditional happens only at boot.
+    }
+    // Do any pin or peripheral setup here; this will be called whenever the watch wakes from deep sleep.
+}
+
+void ke_decimal_time_face_activate(void *context) {
+    ke_decimal_time_state_t *state = (ke_decimal_time_state_t *)context;
+
+    // force re-display of date and time in EVENT_ACTIVATE
+    state->previous_day = 0xFF;
+    state->previous_time = 0xFFFFFFFF;
+}
+
+bool ke_decimal_time_face_loop(movement_event_t event, void *context) {
+    ke_decimal_time_state_t *state = (ke_decimal_time_state_t *)context;
+    watch_date_time_t date_time = movement_get_local_date_time();
+
+    switch (event.event_type) {
+        case EVENT_ACTIVATE:
+            watch_set_decimal_if_available();
+            if (movement_alarm_enabled()) {
+                watch_set_indicator(WATCH_INDICATOR_SIGNAL);
+            }
+            // fall through
+        case EVENT_TICK:
+            _display_time(state, date_time, false);
+            if (state->previous_day != date_time.unit.day) {
+                _display_date(date_time);
+                state->previous_day = date_time.unit.day;
+            }
+            break;
+        case EVENT_LIGHT_BUTTON_UP:
+            // You can use the Light button for your own purposes. Note that by default, Movement will also
+            // illuminate the LED in response to EVENT_LIGHT_BUTTON_DOWN; to suppress that behavior, add an
+            // empty case for EVENT_LIGHT_BUTTON_DOWN.
+            break;
+        case EVENT_ALARM_BUTTON_UP:
+            // Just in case you have need for another button.
+            break;
+        case EVENT_TIMEOUT:
+            // Your watch face will receive this event after a period of inactivity. If it makes sense to resign,
+            // you may uncomment this line to move back to the first watch face in the list:
+            // movement_move_to_face(0);
+            break;
+        case EVENT_LOW_ENERGY_UPDATE:
+            // If you did not resign in EVENT_TIMEOUT, you can use this event to update the display once a minute.
+            // Avoid displaying fast-updating values like seconds, since the display won't update again for 60 seconds.
+            // You should also consider starting the tick animation, to show the wearer that this is sleep mode:
+            if (!watch_sleep_animation_is_running()) {
+                watch_start_sleep_animation(500);
+                watch_display_text(WATCH_POSITION_SECONDS, "  ");
+                watch_display_text(WATCH_POSITION_MINUTES, "  ");
+            }
+            _display_time(state, date_time, true);
+            break;
+        default:
+            // Movement's default loop handler will step in for any cases you don't handle above:
+            // * EVENT_LIGHT_BUTTON_DOWN lights the LED
+            // * EVENT_MODE_BUTTON_UP moves to the next watch face in the list
+            // * EVENT_MODE_LONG_PRESS returns to the first watch face (or skips to the secondary watch face, if configured)
+            // You can override any of these behaviors by adding a case for these events to this switch statement.
+            return movement_default_loop_handler(event);
+    }
+
+    // return true if the watch can enter standby mode. Generally speaking, you should always return true.
+    // Exceptions:
+    //  * If you are displaying a color using the low-level watch_set_led_color function, you should return false.
+    //  * If you are sounding the buzzer using the low-level watch_set_buzzer_on function, you should return false.
+    // Note that if you are driving the LED or buzzer using Movement functions like movement_illuminate_led or
+    // movement_play_alarm, you can still return true. This guidance only applies to the low-level watch_ functions.
+    return true;
+}
+
+void ke_decimal_time_face_resign(void *context) {
+    (void) context;
+
+    // handle any cleanup before your watch face goes off-screen.
+}
+

watch-faces/clock/ke_decimal_time_face.h

@@ -0,0 +1,57 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2025 Joey Castillo
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include "movement.h"
+
+/*
+ * Kè (Decimal Time)
+ *
+ * This watch face is an optional replacement for the standard Clock face.
+ * Like the standard Clock face, it displays the time and weekday at the top,
+ * but the main line shows the percentage of the day that has passed, with midnight
+ * represented by 0% and 11:59 PM as 99.9%.
+ *
+ * Name comes from here: https://en.wikipedia.org/wiki/Traditional_Chinese_timekeeping#One-hundredth_of_a_day:_kè
+ *
+ */
+
+typedef struct {
+    uint8_t previous_day;
+    uint32_t previous_time;
+} ke_decimal_time_state_t;
+
+void ke_decimal_time_face_setup(uint8_t watch_face_index, void ** context_ptr);
+void ke_decimal_time_face_activate(void *context);
+bool ke_decimal_time_face_loop(movement_event_t event, void *context);
+void ke_decimal_time_face_resign(void *context);
+
+#define ke_decimal_time_face ((const watch_face_t){ \
+    ke_decimal_time_face_setup, \
+    ke_decimal_time_face_activate, \
+    ke_decimal_time_face_loop, \
+    ke_decimal_time_face_resign, \
+    NULL, \
+})