intuiclock/src/intuiclock.c

/**
 * Copyright (c) 2015 Tomek Wójcik <tomek@bthlabs.pl>
 * 
 * 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 <pebble.h>

static Window *s_main_window;
static GBitmap *s_background_bitmap;
static GBitmap *s_battery_bitmap;
static GFont s_text_font;
static GPath *s_minute_hand;
static GPath *s_hour_hand;
static BitmapLayer *s_background_layer;
static TextLayer *s_title_layer;
static Layer *s_hands_layer;
static TextLayer *s_date_layer;
static TextLayer *s_ampm_layer;
static BitmapLayer *s_battery_icon_layer;
static Layer *s_battery_indicator_layer;
static struct tm *t = NULL;
static uint8_t battery_charge = 0;
static bool hide_seconds_hand = false;
static bool hide_battery_indicator = false;
static char date_format[2];
static bool use_wide_layout = false;
static bool use_xen_style = false;

static const GPathInfo MINUTE_HAND_POINTS = {
  4,
  (GPoint []) {
    { 0, 0 },
    { -4.5, -26 },
    { 0, -38 },
    { 4.5, -26 }
  }
};

static const GPathInfo HOUR_HAND_POINTS = {
  4,
  (GPoint []) {
    { 0, 0 },
    { -4.5, -22 },
    { 0, -29 },
    { 4.5, -22 }
  }
};

#define AMPM_TEXT_SIZE 3
#define DUMMY_AMPM_TEXT ""

#define DATE_TEXT_SIZE 12
#define DUMMY_DATE_TEXT "23 Jul 1985"

#define KEY_SECONDS_HAND 0
#define KEY_BATTERY_INDICATOR 1
#define KEY_DATE_FORMAT 2
#define KEY_WIDE_LAYOUT 3
#define KEY_XEN_STYLE 4

static void update_date_text_layer() {
    static char date_text[DATE_TEXT_SIZE];
    size_t result = 0;

    if (strcmp(date_format, "d") == 0) {
        result = strftime(date_text, DATE_TEXT_SIZE, "%d/%m/%y", t);
    } else if (strcmp(date_format, "m") == 0) {
        result = strftime(date_text, DATE_TEXT_SIZE, "%m/%d/%y", t);
    } else {
        result = strftime(date_text, DATE_TEXT_SIZE, "%e %b %Y", t);
    }

    if (result != 0) {
        text_layer_set_text(s_date_layer, date_text);
    } else {
        text_layer_set_text(s_date_layer, DUMMY_DATE_TEXT);
    }
}

static void update_ampm_text_layer() {
    static char ampm_text[AMPM_TEXT_SIZE];

    if (clock_is_24h_style()) {
        text_layer_set_text(s_ampm_layer, DUMMY_AMPM_TEXT);
    } else {
        size_t result = strftime(ampm_text, AMPM_TEXT_SIZE, "%p", t);
        if (result != 0) {
            text_layer_set_text(s_ampm_layer, ampm_text);
        } else {
            text_layer_set_text(s_ampm_layer, DUMMY_AMPM_TEXT);
        }
    }

    text_layer_set_text(s_ampm_layer, ampm_text);
}

static void tick_handler(struct tm *tick_time, TimeUnits changed_units) {
    // Getting the current time.
    time_t now = time(NULL);
    t = localtime(&now);

    // Updating views.
    layer_mark_dirty(s_hands_layer);
    update_date_text_layer();
    update_ampm_text_layer();
}

static void s_hands_layer_update(Layer *layer, GContext *ctx) {
    GRect bounds = layer_get_bounds(layer);
    GPoint center = grect_center_point(&bounds);

    // Drawing the minute hand.
    graphics_context_set_fill_color(ctx, GColorBlack);
    graphics_context_set_stroke_color(ctx, GColorBlack);
    gpath_move_to(s_minute_hand, (GPoint){39.5, 39});
    gpath_rotate_to(s_minute_hand, TRIG_MAX_ANGLE * t->tm_min / 60);
    gpath_draw_outline(ctx, s_minute_hand);
    gpath_draw_filled(ctx, s_minute_hand);

    // Drawing the hour hand.
    graphics_context_set_fill_color(ctx, GColorBlack);
    graphics_context_set_stroke_color(ctx, GColorBlack);
    gpath_move_to(s_hour_hand, (GPoint){39.5, 39});
    gpath_rotate_to(s_hour_hand, (TRIG_MAX_ANGLE * (((t->tm_hour % 12) * 6) + (t->tm_min / 10))) / (12 * 6));
    gpath_draw_outline(ctx, s_hour_hand);
    gpath_draw_filled(ctx, s_hour_hand);

    // Drawing the second hand.
    if (hide_seconds_hand == false) {
        graphics_context_set_antialiased(ctx, false);
        int32_t second_angle = TRIG_MAX_ANGLE * t->tm_sec / 60;
        int16_t second_hand_length = (bounds.size.w / 2) - 1;
        GPoint second_hand = {
            .x = (int16_t)(sin_lookup(second_angle) * (int32_t)second_hand_length / TRIG_MAX_RATIO) + center.x,
            .y = (int16_t)(-cos_lookup(second_angle) * (int32_t)second_hand_length / TRIG_MAX_RATIO) + center.y,
        };

        graphics_context_set_stroke_color(ctx, GColorPictonBlue);
        graphics_draw_line(ctx, second_hand, center);
        graphics_context_set_antialiased(ctx, true);
    }
}

static void s_battery_indicator_layer_update(Layer *layer, GContext *ctx) {
    GRect bounds = layer_get_bounds(layer);

    graphics_context_set_fill_color(ctx, GColorGreen);
    if (battery_charge <= 10) {
        graphics_context_set_fill_color(ctx, GColorRed);
    } else if (battery_charge <= 60) {
        graphics_context_set_fill_color(ctx, GColorYellow);
    }

    graphics_fill_rect(ctx, bounds, 0, GCornerNone);
}

static void battery_state_handler(BatteryChargeState charge) {
    if (charge.charge_percent != battery_charge) {
        battery_charge = charge.charge_percent;
        layer_mark_dirty(s_battery_indicator_layer);
    }
}

static void start_time_tracking() {
    TimeUnits unit = MINUTE_UNIT;

    if (hide_seconds_hand == false) {
        unit = SECOND_UNIT;
    }

    tick_handler(NULL, unit);
    tick_timer_service_subscribe(unit, tick_handler);
}

static void start_battery_tracking() {
    if (hide_battery_indicator == false) {
        BatteryChargeState charge = battery_state_service_peek();
        battery_state_handler(charge);
        battery_state_service_subscribe(battery_state_handler);
    } else {
        battery_state_service_unsubscribe();
    }

    layer_set_hidden(bitmap_layer_get_layer(s_battery_icon_layer), hide_battery_indicator);
    layer_set_hidden(s_battery_indicator_layer, hide_battery_indicator);
}

static void update_geometry() {
    if (s_background_bitmap) {
        gbitmap_destroy(s_background_bitmap);
    }

    if (use_wide_layout == false) {
        if (use_xen_style == false) {
            s_background_bitmap = gbitmap_create_with_resource(RESOURCE_ID_IMG_BKG_CLASSIC_NARROW);
        } else {
            s_background_bitmap = gbitmap_create_with_resource(RESOURCE_ID_IMG_BKG_XEN_NARROW);
        }
        
        layer_set_frame(text_layer_get_layer(s_title_layer), GRect(36, 2, 46, 18));
        layer_set_frame(text_layer_get_layer(s_date_layer), GRect(17, 130, 109, 16));
        layer_set_frame(text_layer_get_layer(s_ampm_layer), GRect(108, 26, 16, 16));
        layer_set_frame(bitmap_layer_get_layer(s_battery_icon_layer), GRect(20, 26, 16, 7));
        layer_set_frame(s_battery_indicator_layer, GRect(21, 27, 13, 5));
    } else {
        if (use_xen_style == false) {
            s_background_bitmap = gbitmap_create_with_resource(RESOURCE_ID_IMG_BKG_CLASSIC_WIDE);
        } else {
            s_background_bitmap = gbitmap_create_with_resource(RESOURCE_ID_IMG_BKG_XEN_WIDE);
        }

        layer_set_frame(text_layer_get_layer(s_title_layer), GRect(24, 2, 71, 18));
        layer_set_frame(text_layer_get_layer(s_date_layer), GRect(4, 130, 136, 16));
        layer_set_frame(text_layer_get_layer(s_ampm_layer), GRect(123, 25, 16, 16));
        layer_set_frame(bitmap_layer_get_layer(s_battery_icon_layer), GRect(7, 26, 16, 7));
        layer_set_frame(s_battery_indicator_layer, GRect(8, 27, 13, 5));
    }

    bitmap_layer_set_bitmap(s_background_layer, s_background_bitmap);
}

static void inbox_received_handler(DictionaryIterator *iter, void *context) {
    // Handling seconds_hand setting.
    Tuple *seconds_hand_t = dict_find(iter, KEY_SECONDS_HAND);
    if (seconds_hand_t && seconds_hand_t->value->int32 > 0) {
        hide_seconds_hand = false;
    } else {
        hide_seconds_hand = true;
    }

    persist_write_bool(KEY_SECONDS_HAND, hide_seconds_hand);
    start_time_tracking();

    // Handling battery_indicator setting.
    Tuple *battery_indicator_t = dict_find(iter, KEY_BATTERY_INDICATOR);
    if (battery_indicator_t && battery_indicator_t->value->int32 > 0) {
        hide_battery_indicator = false;
    } else {
        hide_battery_indicator = true;
    }

    persist_write_bool(KEY_BATTERY_INDICATOR, hide_battery_indicator);
    start_battery_tracking();

    // Handling date_format setting.
    Tuple *date_format_t = dict_find(iter, KEY_DATE_FORMAT);
    if (date_format_t) {
        strcpy(date_format, date_format_t->value->cstring);
    }

    persist_write_string(KEY_DATE_FORMAT, date_format);
    update_date_text_layer();

    // Handling wide_layout setting.
    Tuple *wide_layout_t = dict_find(iter, KEY_WIDE_LAYOUT);
    if (wide_layout_t && wide_layout_t->value->int32 > 0) {
        use_wide_layout = true;
    } else {
        use_wide_layout = false;
    }

    persist_write_bool(KEY_WIDE_LAYOUT, use_wide_layout);

    // Handling xen_style setting.
    Tuple *xen_style_t = dict_find(iter, KEY_XEN_STYLE);
    if (xen_style_t && xen_style_t->value->int32 > 0) {
        use_xen_style = true;
    } else {
        use_xen_style = false;
    }

    persist_write_bool(KEY_XEN_STYLE, use_xen_style);

    // Updating geometry according to settings.
    update_geometry();
}

static void main_window_load(Window *window) {
    // Loading resources.
    s_battery_bitmap = gbitmap_create_with_resource(RESOURCE_ID_IMG_BATTERY);
    s_text_font = fonts_load_custom_font(resource_get_handle(RESOURCE_ID_FONT_TOPAZ_16));

    // Creating hand paths.
    s_minute_hand = gpath_create(&MINUTE_HAND_POINTS);
    s_hour_hand = gpath_create(&HOUR_HAND_POINTS);

    Layer *window_layer = window_get_root_layer(window);
    GRect bounds = layer_get_bounds(window_layer);

    // Creating background image layer.
    s_background_layer = bitmap_layer_create(bounds);
    bitmap_layer_set_compositing_mode(s_background_layer, GCompOpSet);
    layer_add_child(window_layer, bitmap_layer_get_layer(s_background_layer));

    // Creating title text layer.
    s_title_layer = text_layer_create(GRect(0, 0, 71, 18));
    text_layer_set_background_color(s_title_layer, GColorClear);
    text_layer_set_text(s_title_layer, "Clock");
    text_layer_set_font(s_title_layer, s_text_font);
    layer_add_child(window_layer, text_layer_get_layer(s_title_layer));

    // Creating hands layer.
    s_hands_layer = layer_create(GRect(32, 38, 78, 78));
    layer_set_update_proc(s_hands_layer, s_hands_layer_update);
    layer_add_child(window_layer, s_hands_layer);

    // Creating date layer.
    s_date_layer = text_layer_create(GRect(0, 0, 136, 16));
    text_layer_set_text_alignment(s_date_layer, GTextAlignmentCenter);
    text_layer_set_background_color(s_date_layer, GColorClear);
    text_layer_set_font(s_date_layer, s_text_font);
    layer_add_child(window_layer, text_layer_get_layer(s_date_layer));

    // Creating AM/PM layer.
    s_ampm_layer = text_layer_create(GRect(0, 0, 16, 16));
    text_layer_set_text_alignment(s_ampm_layer, GTextAlignmentCenter);
    text_layer_set_background_color(s_ampm_layer, GColorClear);
    text_layer_set_text_color(s_ampm_layer, GColorWhite);
    text_layer_set_font(s_ampm_layer, s_text_font);
    layer_add_child(window_layer, text_layer_get_layer(s_ampm_layer));

    // Creating battery icon layer.
    s_battery_icon_layer = bitmap_layer_create(GRect(0, 0, 16, 7));
    bitmap_layer_set_bitmap(s_battery_icon_layer, s_battery_bitmap);
    bitmap_layer_set_compositing_mode(s_battery_icon_layer, GCompOpSet);
    layer_add_child(window_layer, bitmap_layer_get_layer(s_battery_icon_layer));

    // Creating battery indicator layer.
    s_battery_indicator_layer = layer_create(GRect(0, 0, 13, 5));
    layer_set_update_proc(s_battery_indicator_layer, s_battery_indicator_layer_update);
    layer_add_child(window_layer, s_battery_indicator_layer);

    // Update geometry according to wide_layout and xen_style settings.
    use_wide_layout = persist_read_bool(KEY_WIDE_LAYOUT);
    use_xen_style = persist_read_bool(KEY_XEN_STYLE);
    update_geometry();

    // Read date_format setting from persistent storage.
    int result = persist_read_string(KEY_DATE_FORMAT, date_format, 2);
    if (result == E_DOES_NOT_EXIST) {
        strcpy(date_format, "t");
    }

    // Starting time tracking.
    hide_seconds_hand = persist_read_bool(KEY_SECONDS_HAND);
    start_time_tracking();

    // Starting battery tracking.
    hide_battery_indicator = persist_read_bool(KEY_BATTERY_INDICATOR);
    start_battery_tracking();
}

static void main_window_unload(Window *window) {
    battery_state_service_unsubscribe();
    tick_timer_service_unsubscribe();

    // Apparently, freeing this pointer causes the watchface to crash on
    // v3.3. Weird.
    // if (t) {
    //     free(t);
    // }

    layer_destroy(s_battery_indicator_layer);
    bitmap_layer_destroy(s_battery_icon_layer);
    text_layer_destroy(s_ampm_layer);
    text_layer_destroy(s_date_layer);
    layer_destroy(s_hands_layer);
    text_layer_destroy(s_title_layer);
    bitmap_layer_destroy(s_background_layer);

    gpath_destroy(s_hour_hand);
    gpath_destroy(s_minute_hand);

    fonts_unload_custom_font(s_text_font);
    gbitmap_destroy(s_battery_bitmap);
    gbitmap_destroy(s_background_bitmap);
}

static void init() {
    s_main_window = window_create();

    window_set_window_handlers(s_main_window, (WindowHandlers) {
        .load = main_window_load,
        .unload = main_window_unload
    });

    window_stack_push(s_main_window, true);

    app_message_register_inbox_received(inbox_received_handler);
    app_message_open(app_message_inbox_size_maximum(), app_message_outbox_size_maximum());
}

static void deinit() {
    window_destroy(s_main_window);
}

int main(void) {
    init();
    app_event_loop();
    deinit();
}