Add solstice_face.

movement/watch_faces/complication/solstice_face.h

@@ -0,0 +1,64 @@
+/*
+ * 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.
+ */
+
+#ifndef SOLSTICE_FACE_H_
+#define SOLSTICE_FACE_H_
+
+#include "movement.h"
+
+/*
+ * A face for telling the dates and times of solstices and equinoxes
+ *
+ * It shows the upcoming solstice or equinox by default. The upper right number
+ * is the year, and the bottom numbers are the date in MMDD format. Use the
+ * alarm / light buttons to go forwards / backwards in time. Long press the
+ * alarm button to show the time of the event, including what weekday it is on,
+ * in your local timezone (DST is not handled).
+ *
+ * Supports the years 2020 - 2083. The calculations are reasonably accurate for
+ * years between 1000 and 3000, but limitations in the sensor watch libraries
+ * (which could easily be worked around) prevent making use of that.
+ */
+
+typedef struct {
+    watch_date_time datetimes[4];
+    uint8_t year;
+    uint8_t index;
+} solstice_state_t;
+
+void solstice_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);
+void solstice_face_activate(movement_settings_t *settings, void *context);
+bool solstice_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void solstice_face_resign(movement_settings_t *settings, void *context);
+
+#define solstice_face ((const watch_face_t){ \
+    solstice_face_setup, \
+    solstice_face_activate, \
+    solstice_face_loop, \
+    solstice_face_resign, \
+    NULL, \
+})
+
+#endif // SOLSTICE_FACE_H_
+