Trammell Hudson avatar Trammell Hudson committed dade51c

Three timezone watch

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Files changed (4)

timezones/src/Makefile

+#
+# Show three timezones
+#
+
+APP := timezones
+
+SRCS += tz.c
+
+FONTS := \
+	fonts/Arial.ttf:16 \
+	fonts/Arial-Black.ttf:30 \
+
+IMAGES := \
+	images/menu_icon.png \
+
+include ../../Makefile.pebble

timezones/src/fonts/Arial-Black.ttf

+../../../hoelaat/src/fonts/Arial-Black.ttf

timezones/src/fonts/Arial.ttf

+../../../hoelaat/src/fonts/Arial.ttf

timezones/src/tz.c

+/** \file
+ * Three time zone clock;
+ *
+ * When it is day, the text and background are white.
+ * When it is night, they are black.
+ *
+ * Rather than use text layers, it draws the entire frame once per minute.
+ */
+#include "pebble_os.h"
+#include "pebble_app.h"
+#include "pebble_fonts.h"
+#include "pebble_th.h"
+
+#define UUID { 0xE6, 0x87, 0x18, 0x07, 0x0E, 0x8A, 0x4F, 0xC2, 0xB6, 0xFF, 0x0E, 0x66, 0xA9, 0xC1, 0x7E, 0xA7 }
+
+PBL_APP_INFO(
+	UUID,
+	"Timezones",
+	"hudson",
+	1, 0, // Version
+	RESOURCE_ID_IMAGE_MENU_ICON,
+	APP_INFO_WATCH_FACE
+);
+
+
+typedef struct
+{
+	const char * name;
+	int offset;
+	Layer layer;
+} timezone_t;
+
+
+// Local timezone GMT offset
+static const int gmt_offset = -5;
+
+#define NUM_TIMEZONES 3
+#define LAYER_HEIGHT (PEBBLE_SCREEN_HEIGHT / NUM_TIMEZONES)
+
+static timezone_t timezones[NUM_TIMEZONES] =
+{
+	{ "London", +0, {} },
+	{ "New York", -5, {} },
+	{ "Tokyo", +8, {} },
+};
+
+
+static Window window;
+static PblTm now;
+static GFont font_thin;
+static GFont font_thick;
+
+
+static void
+timezone_layer_update(
+        Layer * const me,
+        GContext * ctx
+)
+{
+	const timezone_t * const tz = container_of(me, timezone_t, layer);
+
+	const int orig_hour = now.tm_hour;
+
+	now.tm_hour += tz->offset - gmt_offset;
+	if (now.tm_hour > 24)
+		now.tm_hour -= 24;
+	if (now.tm_hour < 0)
+		now.tm_hour += 24;
+
+	char buf[32];
+	string_format_time(
+		buf,
+		sizeof(buf),
+		"%H:%M",
+		&now
+	);
+
+
+	const int night_time = (now.tm_hour > 18 || now.tm_hour < 6);
+	now.tm_hour = orig_hour;
+
+	const int w = me->bounds.size.w;
+	const int h = me->bounds.size.h;
+		
+	// it is night there, draw in black video
+	graphics_context_set_fill_color(ctx, night_time ? GColorBlack : GColorWhite);
+	graphics_context_set_text_color(ctx, !night_time ? GColorBlack : GColorWhite);
+	graphics_fill_rect(ctx, GRect(0, 0, w, h), 0, 0);
+
+	graphics_text_draw(ctx,
+		tz->name,
+		font_thin,
+		GRect(0, 0, w, h/3),
+		GTextOverflowModeTrailingEllipsis,
+		GTextAlignmentCenter,
+		NULL
+	);
+
+	graphics_text_draw(ctx,
+		buf,
+		font_thick,
+		GRect(0, h/3, w, 2*h/3),
+		GTextOverflowModeTrailingEllipsis,
+		GTextAlignmentCenter,
+		NULL
+	);
+}
+
+
+/** Called once per minute */
+static void
+handle_tick(
+	AppContextRef ctx,
+	PebbleTickEvent * const event
+)
+{
+	(void) ctx;
+
+	now = *event->tick_time;
+
+	for (int i = 0 ; i < NUM_TIMEZONES ; i++)
+		layer_mark_dirty(&timezones[i].layer);
+}
+
+
+static void
+handle_init(
+	AppContextRef ctx
+)
+{
+	(void) ctx;
+
+	window_init(&window, "Main");
+	window_stack_push(&window, true);
+	window_set_background_color(&window, GColorBlack);
+
+	resource_init_current_app(&RESOURCES);
+
+	font_thin = fonts_load_custom_font(resource_get_handle(RESOURCE_ID_FONT_ARIAL_16));
+	font_thick = fonts_load_custom_font(resource_get_handle(RESOURCE_ID_FONT_ARIAL_BLACK_30));
+
+	for (int i = 0 ; i < NUM_TIMEZONES ; i++)
+	{
+		timezone_t * const tz = &timezones[i];
+		layer_init(
+			&tz->layer,
+			GRect(0, i * LAYER_HEIGHT, PEBBLE_SCREEN_WIDTH, LAYER_HEIGHT)
+		);
+
+		tz->layer.update_proc = timezone_layer_update;
+		layer_add_child(&window.layer, &tz->layer);
+		layer_mark_dirty(&tz->layer);
+	}
+}
+
+
+static void
+handle_deinit(
+	AppContextRef ctx
+)
+{
+	(void) ctx;
+
+	fonts_unload_custom_font(font_thin);
+	fonts_unload_custom_font(font_thick);
+}
+
+
+void
+pbl_main(
+	void * const params
+)
+{
+	PebbleAppHandlers handlers = {
+		.init_handler	= &handle_init,
+		.deinit_handler = &handle_deinit,
+		.tick_info	= {
+			.tick_handler = &handle_tick,
+			.tick_units = MINUTE_UNIT,
+		},
+	};
+
+	app_event_loop(params, &handlers);
+}
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