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Pebble Tutorial Part 1 - 3
"uuid": "ed70b15c-3c48-4828-8e8c-e39a28efb38d",
"shortName": "Tutorial-1-3",
"longName": "Tutorial-1-3",
"companyName": "Pebble",
"versionCode": 1,
"versionLabel": "1.0",
"sdkVersion": 3,
"watchapp": {
"watchface": true
"appKeys": {},
"resources": {
"media": []
#include <pebble.h>
static Window *s_main_window;
static TextLayer *s_time_layer;
static void update_time() {
// Get a tm structure
time_t temp = time(NULL);
struct tm *tick_time = localtime(&temp);
// Write the current hours and minutes into a buffer
static char s_buffer[8];
strftime(s_buffer, sizeof(s_buffer), clock_is_24h_style() ?
"%H:%M" : "%I:%M", tick_time);
// Display this time on the TextLayer
text_layer_set_text(s_time_layer, s_buffer);
static void tick_handler(struct tm *tick_time, TimeUnits units_changed) {
static void main_window_load(Window *window) {
// Get information about the Window
Layer *window_layer = window_get_root_layer(window);
GRect bounds = layer_get_bounds(window_layer);
// Create the TextLayer with specific bounds
s_time_layer = text_layer_create(
GRect(0, PBL_IF_ROUND_ELSE(58, 52), bounds.size.w, 50));
// Improve the layout to be more like a watchface
text_layer_set_background_color(s_time_layer, GColorClear);
text_layer_set_text_color(s_time_layer, GColorBlack);
text_layer_set_text(s_time_layer, "00:00");
text_layer_set_font(s_time_layer, fonts_get_system_font(FONT_KEY_BITHAM_42_BOLD));
text_layer_set_text_alignment(s_time_layer, GTextAlignmentCenter);
// Add it as a child layer to the Window's root layer
layer_add_child(window_layer, text_layer_get_layer(s_time_layer));
static void main_window_unload(Window *window) {
// Destroy TextLayer
static void init() {
// Create main Window element and assign to pointer
s_main_window = window_create();
// Set handlers to manage the elements inside the Window
window_set_window_handlers(s_main_window, (WindowHandlers) {
.load = main_window_load,
.unload = main_window_unload
// Show the Window on the watch, with animated=true
window_stack_push(s_main_window, true);
// Make sure the time is displayed from the start
// Register with TickTimerService
tick_timer_service_subscribe(MINUTE_UNIT, tick_handler);
static void deinit() {
// Destroy Window
int main(void) {
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