recorder: set scale on OpenStMap plot

When plotting with OpenStMap scale map to track width & height

apps/recorder/ChangeLog

@@ -33,4 +33,5 @@
 0.25: Widget now has `isRecording()` for retrieving recording status.
 0.26: Now record filename based on date
 0.27: Fix first ever recorded filename being log0 (now all are dated)
-0.28: Automatically create new track if the filename is different
+0.28: Automatically create new track if the filename is different
+0.29: When plotting with OpenStMap scale map to track width & height

apps/recorder/app.js

@@ -224,6 +224,12 @@ function viewTrack(filename, info) {
     // Function to convert lat/lon to XY
     var getMapXY;
     if (info.qOSTM) {
+      // scale map to view full track
+      const max = Bangle.project({lat: info.maxLat, lon: info.maxLong});
+      const min = Bangle.project({lat: info.minLat, lon: info.minLong});
+      const scaleX = (max.x-min.x)/Bangle.appRect.w;
+      const scaleY = (max.y-min.y)/Bangle.appRect.h;
+      osm.scale = Math.ceil((scaleX > scaleY ? scaleX : scaleY)*1.1); // add 10% margin
       getMapXY = osm.latLonToXY.bind(osm);
     } else {
       getMapXY = function(lat, lon) { "ram"

apps/recorder/metadata.json

@@ -2,7 +2,7 @@
   "id": "recorder",
   "name": "Recorder",
   "shortName": "Recorder",
-  "version": "0.28",
+  "version": "0.29",
   "description": "Record GPS position, heart rate and more in the background, then download to your PC.",
   "icon": "app.png",
   "tags": "tool,outdoors,gps,widget",