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apps/sunclock/app.js

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+/* sclock.app.js for Bangle2
+Peter Bernschneider 30.12.2021
+Update current latitude and longitude in My Location app
+Update current Timezone in Settings app, menu item "System"
+Update for summer time by incrementing Timezone += 1 */
+setting = require("Storage").readJSON("setting.json",1);
+E.setTimeZone(setting.timezone); // timezone = 1 for MEZ, = 2 for MESZ
+SunCalc = require("suncalc.js");
+loc = require('locale');
+const LOCATION_FILE = "mylocation.json";
+const xyCenter = g.getWidth() / 2 + 3;
+const yposTime =  60; 
+const yposDate = 100; 
+const yposRS   = 135;
+const yposPos  = 160;
+var rise = "07:00";
+var set  = "20:00";
+var pos     = {altitude: 20, azimuth: 135};
+var noonpos = {altitude: 37, azimuth: 180};
+let idTimeout = null;
+
+function updatePos() {
+  coord = require("Storage").readJSON(LOCATION_FILE,1)|| {"lat":53.3,"lon":10.1,"location":"Pattensen"};
+  pos = SunCalc.getPosition(Date.now(), coord.lat, coord.lon);  
+  times = SunCalc.getTimes(Date.now(), coord.lat, coord.lon);
+  rise = times.sunrise.toString().split(" ")[4].substr(0,5);
+  set  = times.sunset.toString().split(" ")[4].substr(0,5);
+  noonpos = SunCalc.getPosition(times.solarNoon, coord.lat, coord.lon);
+}
+
+function drawSimpleClock() {
+  var d = new Date(); // get date
+  var da = d.toString().split(" ");
+  g.clear();
+  Bangle.drawWidgets();
+  g.reset(); // default draw styles
+  g.setFontAlign(0, 0); // drawSting centered
+
+  var time = da[4].substr(0, 5); // draw time
+
+  g.setFont("Vector",60); 
+  g.drawString(time, xyCenter, yposTime, true);
+
+  var date = [loc.dow(new Date(),1), loc.date(d,1)].join(" "); // draw Day, name of month, Date
+  g.setFont("Vector",24);
+  g.drawString(date, xyCenter, yposDate, true);
+
+  g.setFont("Vector",25);
+  g.drawString(`${rise}  ${set}`, xyCenter, yposRS, true); // draw riseset
+  g.drawImage(require("Storage").read("sunrise.img"), xyCenter-16, yposRS-16);
+
+  g.setFont("Vector",21);
+  g.drawString(`H${pos.altitude}/${noonpos.altitude} Az${pos.azimuth}`, xyCenter, yposPos, true); // draw sun pos
+    
+  let t = d.getSeconds()*1000 + d.getMilliseconds();
+  idTimeout = setTimeout(drawSimpleClock, 60000 - t); // time till next minute
+}
+
+// special function to handle display switch on
+Bangle.on('lcdPower', function(on){
+  if (on) {
+    drawSimpleClock();
+  } else {
+    if(idTimeout) {
+      clearTimeout(idTimeout);
+    }
+  }
+});
+
+g.clear(); // clean app screen
+Bangle.loadWidgets();
+Bangle.drawWidgets();
+
+setInterval(updatePos, 60*15E3);    // refesh every 15 mins
+
+updatePos();
+drawSimpleClock(); // draw now
+
+setWatch(Bangle.showLauncher, BTN1, { repeat: false, edge: "falling" }); // Show launcher when button pressed