add simple track recorder to testing folder

testing/gpstrack.js

@@ -0,0 +1,78 @@
+// unfinished GPS Track recorder
+g.clear();
+var gpsTrack = require("Storage").open(".track","w");
+var gpsTrackLen = 0;
+var recording = false;
+var inMenu = false;
+var currentFix;
+
+function drawIcons() {
+  g.clearRect(220,110,240,130);
+  if (recording) {
+    g.fillRect(225,115,235,125);
+  } else {
+    g.setColor(1,0,0);
+    g.fillCircle(230,120,10);
+    g.setColor(1,1,1);
+  }
+  g.setFont("6x8");
+  g.setFontAlign(0,0);
+  g.drawString("X",230,220);
+}
+
+setWatch(() => {
+  if (inMenu) return;
+  recording = !recording;
+  drawIcons();
+}, BTN2, {repeat:true});
+setWatch(() => {
+  if (inMenu) return;
+  inMenu = true;
+  g.flip();
+  E.showPrompt("Erase GPS Trace?").then(r=>{
+    inMenu = false;
+    if (r) {
+      gpsTrack.erase();
+      gpsTrack = require("Storage").open(".track","w");
+      gpsTrackLen = 0;
+    }
+  });
+}, BTN3, {repeat:true});
+
+function onGPS(fix) {
+  currentFix = fix;
+  if (!inMenu) {
+    g.setFont("6x8");
+    g.setFontAlign(0,0);
+    g.drawString(" "+fix.satellites+" Satellites ",120,4,true/*solid bg*/);
+    g.drawString(fix.fix ? "FIX Acquired":"     NO FIX    ",120,12,true/*solid bg*/);
+    drawIcons();
+  }
+  if (!fix.fix) return;
+  if (recording) {
+    gpsTrack.write([
+      fix.time.toISOString().slice(0,-5),
+      fix.lat.toFixed(5),
+      fix.lon.toFixed(5),
+      fix.alt
+    ].join(",")+"\n");
+    gpsTrackLen++;
+  }
+  if (!inMenu) {
+    g.drawString("  TRACK LENGTH "+gpsTrackLen+" ",120,236,true/*solid bg*/);
+  }
+  // TODO: Use Bangle.project to map this out onto the Screen?
+}
+
+Bangle.on('GPS',onGPS);
+Bangle.setGPSPower(true);
+
+// Write the contents of the track out to the console
+function dumpTrack() {
+  var f = require("Storage").open(".track","r");
+  var l;
+  do {
+    l = f.readLine();
+    if (l) console.log(l);
+  } while (l);
+}