added gps

apps/moonphase/app.js

@@ -1,6 +1,26 @@
 //Icons from https://icons8.com
 //Sun and Moon calculations from https://github.com/mourner/suncalc and https://gist.github.com/endel/dfe6bb2fbe679781948c
 
+//varibales
+const storage = require('Storage');
+let coords;
+var timer;
+var fix;
+
+var PI   = Math.PI,
+    sin  = Math.sin,
+    cos  = Math.cos,
+    tan  = Math.tan,
+    asin = Math.asin,
+    atan = Math.atan2,
+    acos = Math.acos,
+    rad  = PI / 180,
+    dayMs = 1000 * 60 * 60 * 24,
+    J1970 = 2440588,
+    J2000 = 2451545;
+
+var SunCalc = {};
+
 //pictures
 function getImg(i) {
     var data = {
@@ -25,26 +45,8 @@ function getImg(i) {
       buffer : E.toArrayBuffer(atob(data[i]))
     };
 }
-    
-    //coordinates (will get from GPS later on real device)
-    var lat = 52.96236,
-        lon = 7.62571;
-    
-    var PI   = Math.PI,
-        sin  = Math.sin,
-        cos  = Math.cos,
-        tan  = Math.tan,
-        asin = Math.asin,
-        atan = Math.atan2,
-        acos = Math.acos,
-        rad  = PI / 180;
-    
 // sun calculations are based on http://aa.quae.nl/en/reken/zonpositie.html formulas
 // date/time constants and conversions 
-    var dayMs = 1000 * 60 * 60 * 24,
-        J1970 = 2440588,
-        J2000 = 2451545;
-    
 function toJulian(date) { return date.valueOf() / dayMs - 0.5 + J1970; }
 function fromJulian(j)  { return new Date((j + 0.5 - J1970) * dayMs); }
 function toDays(date)   { return toJulian(date) - J2000; }
@@ -76,17 +78,15 @@ function getImg(i) {
 }
     
 function sunCoords(d) {
-    
     var M = solarMeanAnomaly(d),
         L = eclipticLongitude(M);
-    
     return {
         dec: declination(L, 0),
         ra: rightAscension(L, 0)
     };
 }
     
-    var SunCalc = {};
+    
     
 // adds a custom time to the times config
 SunCalc.addTime = function (angle, riseName, setName) {
@@ -131,7 +131,6 @@ function getImg(i) {
 // calculations for illumination parameters of the moon,
 // based on http://idlastro.gsfc.nasa.gov/ftp/pro/astro/mphase.pro formulas and
 // Chapter 48 of "Astronomical Algorithms" 2nd edition by Jean Meeus (Willmann-Bell, Richmond) 1998.
-    
 SunCalc.getMoonIllumination = function (date) {
     var year = date.getFullYear();
     var month = date.getMonth();
@@ -156,7 +155,6 @@ function getImg(i) {
         jd -= b; // subtract integer part to leave fractional part of original jd
         b = Math.round(jd * 8); // scale fraction from 0-8 and round
         if (b >= 8) b = 0; // 0 and 8 are the same so turn 8 into 0
-        //print ({phase: b, name: Moon.phases[b]});
         return {phase: b, name: Moon.phases[b]};
         }
     };
@@ -168,7 +166,6 @@ function getImg(i) {
 }
     
 // calculations for moon rise/set times are based on http://www.stargazing.net/kepler/moonrise.html article
-    
 SunCalc.getMoonTimes = function (date, lat, lng, inUTC) {
     var t = new Date(date);
     if (inUTC) t.setUTCHours(0, 0, 0, 0);
@@ -237,7 +234,7 @@ function getImg(i) {
 }
     
 function drawMoonPhase(offset, x, y){
-      if (lat >= 0 && lat <= 90){ //Northern hemisphere
+    if (coords.lat >= 0 && coords.lat <= 90){ //Northern hemisphere
     if (getMPhaseSim(offset) == "new") {g.drawImage(getImg("NewMoon"), x, y);}
     if (getMPhaseSim(offset) == "waxing-crescent") {g.drawImage(getImg("WaxingCrescentNorth"), x, y);}
     if (getMPhaseSim(offset) == "first-quarter") {g.drawImage(getImg("FirstQuarterNorth"), x, y);}
@@ -263,6 +260,9 @@ function getImg(i) {
     g.setFont("6x8");
     g.clear();
     g.drawString("Key1: day+, Key2:today, Key3:day-",x,y-30);
+    g.drawString("Last known coordinates: " + coords.lat.toFixed(4) + " " + coords.lon.toFixed(4), x, y-20);
+    g.drawString("Press BTN4 to update",x, y-10);
+
     g.drawString(getMPhaseComp(offset),x,y+30);
     drawMoonPhase(offset, x+35, y+40);
     
@@ -276,27 +276,78 @@ function getImg(i) {
     drawMoonPhase(offset+6, x+35, y+160);
 }
 
+//Write coordinates to file
+function updateCoords() {
+    storage.write('coords.json', coords);
+}
+
+//set coordinates to default (city where I live)
+function resetCoords() {
+    coords = {
+    lat : 52.96236,
+    lon : 7.62571,
+    };
+    updateCoords();
+}
+    
+function getGpsFix() {
+    Bangle.on('GPS', function(fix) {
+        g.clear();
+
+        if (fix.fix == 1) {
+            var gpsString = "lat: " + fix.lat.toFixed(4) + " lon: " + fix.lon.toFixed(4);
+            coords.lat = fix.lat;
+            coords.lon = fix.lon;
+            updateCoords();
+            g.drawString("Got GPS fix and wrote coords to file",10,20);
+            g.drawString(gpsString,10,30);
+            g.drawString("Press BTN5 to return to app",10,40);
+            clearInterval(timer);
+            timer = undefined;
+        }
+        else {
+            g.drawString("Searching satellites...",10,20);
+            g.drawString("Press BTN5 to stop GPS",10, 30);
+        }
+    });
+}
+    
 function start() {
     var x = 10;
     var y = 50;
     var offsetMoon = 0;
+    coords = storage.readJSON('coords.json',1); //read coordinates from file
+    if (!coords) resetCoords(); //if coordinates could not be read, reset them
     drawMoon(offsetMoon, x, y); //offset, x, y
 
     //define button functions
-      setWatch(function() {
+    setWatch(function() { //BTN1
         offsetMoon++; //jump to next day
         drawMoon(offsetMoon, x, y); //offset, x, y
     }, BTN1, {edge:"rising", debounce:50, repeat:true});
 
-      setWatch(function() {
+    setWatch(function() { //BTN2
         offsetMoon = 0; //jump to today
         drawMoon(offsetMoon, x, y); //offset, x, y
     }, BTN2, {edge:"rising", debounce:50, repeat:true});
 
-      setWatch(function() {
+    setWatch(function() { //BTN3
         offsetMoon--; //jump to next day
         drawMoon(offsetMoon, x, y); //offset, x, y
     }, BTN3, {edge:"rising", debounce:50, repeat:true});
+
+    setWatch(function() { //BTN4
+        g.drawString("--- Getting GPS signal ---",x, y);
+        Bangle.setGPSPower(1);
+        timer = setInterval(getGpsFix, 10000);
+    }, BTN4, {edge:"rising", debounce:50, repeat:true});
+
+    setWatch(function() { //BTN5
+        if (timer) clearInterval(timer);
+        timer = undefined;
+        Bangle.setGPSPower(0);
+        drawMoon(offsetMoon, x, y); //offset, x, y
+    }, BTN5, {edge:"rising", debounce:50, repeat:true});
 }
     
 start();