Initial weather support

src/c/main.c

@@ -41,6 +41,7 @@ static GBitmap *s_f_icon;
 
 // tracking statics
 static int s_batt_level;
+static uint8_t s_temp_level;
 
 // bar statics
 static const uint8_t s_bar_height = 8;
@@ -56,7 +57,7 @@ static void batt_callback(BatteryChargeState state) {
 // TODO use temperature (for now it updates with battery usage)
 static void temp_update_proc(Layer *layer, GContext *ctx) {
 	graphics_context_set_fill_color(ctx, GColorWhite);
-	const uint8_t bar_count = s_batt_level / 5;
+	const uint8_t bar_count = s_temp_level;
 	uint16_t bar_bottom_pos = 195;
 
 	for (uint8_t i = 0; i < bar_count; ++i) {
@@ -258,14 +259,27 @@ static void minute_handler(struct tm *tick_time, TimeUnits units_changed) {
 static void inbox_received_handler(DictionaryIterator *iter, void *context) {
 	Tuple *ready_tuple = dict_find(iter, MESSAGE_KEY_PKJS_READY);
 	if (ready_tuple) {
-		// TODO request temp bars from PKJS
+		// request temp bars from PKJS
+		DictionaryIterator *out;
+		AppMessageResult result = app_message_outbox_begin(&out);
+		if (result != APP_MSG_OK) {
+			s_temp_level = 0; // error; set to 0 bars to indicate TODO invert color and set to 20?
+			return;
+		}
+		dict_write_int8(out, MESSAGE_KEY_PKJS_TEMP_BAR_COUNT, 1);
+		result = app_message_outbox_send();
+		if (result != APP_MSG_OK) {
+			s_temp_level = 0; // error; set to 0 bars to indicate TODO invert color and set to 20?
+			return;
+		}
 		return;
 	}
 
 	// TEMPERATURE DATA
 	Tuple *temp_bar_count = dict_find(iter, MESSAGE_KEY_PKJS_TEMP_BAR_COUNT);
 	if (temp_bar_count) {
-		// TODO
+		s_temp_level = temp_bar_count->value->uint8;
+		layer_mark_dirty(s_temp_layer);
 		return;
 	}
 

src/pkjs/index.js

@@ -1,6 +1,8 @@
 var Clay = require('@rebble/clay');
 var clayConfig = require('./config');
 var customClay = require('./customClay');
+require('./weather');
+
 new Clay(clayConfig, customClay);
 
 Pebble.addEventListener("ready", function () {

src/pkjs/weather.js

@@ -0,0 +1,42 @@
+var xhrRequest = function (url, type, callback) {
+    var xhr = new XMLHttpRequest();
+    xhr.onload = function () {
+        callback(this.responseText);
+    };
+    xhr.open(type, url);
+    xhr.send();
+};
+
+function locationSuccess(pos) {
+    var url = 'https://api.open-meteo.com/v1/forecast?' +
+        'latitude=' + pos.coords.latitude +
+        '&longitude=' + pos.coords.longitude +
+        '&current=temperature_2m';
+
+    xhrRequest(url, 'GET',
+        function (responseText) {
+            var json = JSON.parse(responseText);
+
+            // clamp into a range of 80 (technically 81)C (-32,48), -32C=-25.6F, 48C=118.4F
+            var temperature = Math.min(Math.max(json.current.temperature_2m, -32), 48);
+            // set set range minimum to 0 (add 32) and convert to bars (0-20)
+            temperature = Math.round((temperature + 32) / 4);
+
+            Pebble.sendAppMessage({ PKJS_TEMP_BAR_COUNT: temperature });
+        }
+    );
+}
+
+function getWeather() {
+    navigator.geolocation.getCurrentPosition(
+        locationSuccess,
+        null,
+        { timeout: 15000, maximumAge: 60000 }
+    );
+}
+
+Pebble.addEventListener("appmessage", function (dict) {
+    if (dict.payload["PKJS_TEMP_BAR_COUNT"]) {
+        getWeather();
+    }
+});