gpsrec 0.09: Change default GPS period to 10 (1 is overkill for most uses and makes things slow)

Added RAM keyword to functions & other tweaks to speed up rendering
      Going 'back' from track view now doesn't load again

apps.json

@@ -314,7 +314,7 @@
   { "id": "gpsrec",
     "name": "GPS Recorder",
     "icon": "app.png",
-    "version":"0.08",
+    "version":"0.09",
     "interface": "interface.html",
     "description": "Application that allows you to record a GPS track. Can run in background",
     "tags": "tool,outdoors,gps,widget",

apps/gpsrec/ChangeLog

@@ -7,3 +7,6 @@
 0.07: Added @jeffmer's awesome track viewer
 0.08: Don't overwrite existing settings on app update
       Clean up recorded tracks on app removal
+0.09: Change default GPS period to 10 (1 is overkill for most uses and makes things slow)
+      Added RAM keyword to functions & other tweaks to speed up rendering
+      Going 'back' from track view now doesn't load again

apps/gpsrec/app-settings.json

@@ -1,5 +1,5 @@
 {
   "recording":false,
   "file":0,
-  "period":1
+  "period":10
 }

apps/gpsrec/app.js

@@ -60,7 +60,7 @@ function viewTracks() {
   for (var n=0;n<36;n++) {
     var f = require("Storage").open(getFN(n),"r");
     if (f.readLine()!==undefined) {
-      menu["Track "+n] = viewTrack.bind(null,n);
+      menu["Track "+n] = viewTrack.bind(null,n,false);
       found = true;
     }
   }
@@ -71,6 +71,7 @@ function viewTracks() {
 }
 
 function getTrackInfo(fn) {
+  "ram"
   var filename = getFN(fn);
   var minLat = 90;
   var maxLat = -90;
@@ -88,8 +89,8 @@ function getTrackInfo(fn) {
   // pushed this loop together to try and bump loading speed a little
   while(l!==undefined) {
     ++nl;c=l.split(",");
-    n = parseFloat(c[1]);if(n>maxLat)maxLat=n;if(n<minLat)minLat=n;
+    n = +c[1];if(n>maxLat)maxLat=n;if(n<minLat)minLat=n;
-    n = parseFloat(c[2]);if(n>maxLong)maxLong=n;if(n<minLong)minLong=n;
+    n = +c[2];if(n>maxLong)maxLong=n;if(n<minLong)minLong=n;
     l = f.readLine(f);
   }
   if (c) duration = parseInt(c[0]) - starttime;
@@ -116,9 +117,11 @@ function asTime(v){
   return ""+mins.toString()+"m "+secs.toString()+"s";
 }
 
-function viewTrack(n) {
+function viewTrack(n, info) {
+  if (!info) {
     E.showMessage("Loading...","GPS Track "+n);
-  var info = getTrackInfo(n);
+    info = getTrackInfo(n);
+  }
   const menu = {
     '': { 'title': 'GPS Track '+n }
   };
@@ -138,7 +141,7 @@ function viewTrack(n) {
         f.erase();
         viewTracks();
       } else
-        viewTrack(n);
+        viewTrack(n, info);
     });
   };
   menu['< Back'] = viewTracks;
@@ -146,13 +149,7 @@ function viewTrack(n) {
 }
 
 function plotTrack(info) {
-  function xcoord(long){
+  "ram"
-    return 30 + Math.round((long-info.minLong)*info.lfactor*info.scale);
-  }
-
-  function ycoord(lat){
-    return 210 - Math.round((lat - info.minLat)*info.scale);
-  }
 
   function radians(a) {
     return a*Math.PI/180;
@@ -182,27 +179,26 @@ function plotTrack(info) {
   var ox=0;
   var oy=0;
   var olat,olong,dist=0;
-  var first = true;
   var i=0;
-  while(l!==undefined) {
   var c = l.split(",");
-    var lat = parseFloat(c[1]);
+  var lat = +c[1];
-    var long = parseFloat(c[2]);
+  var long = +c[2];
-    var x = xcoord(long);
+  var x = 30 + Math.round((long-info.minLong)*info.lfactor*info.scale);
-    var y = ycoord(lat);
+  var y = 210 - Math.round((lat - info.minLat)*info.scale);
-    if (first) {
   g.moveTo(x,y);
   g.setColor(0,1,0);
   g.fillCircle(x,y,5);
   g.setColor(1,1,1);
-      first = false;
+  l = f.readLine(f);
-    } else if (x!=ox || y!=oy) {
+  while(l!==undefined) {
+    c = l.split(",");
+    lat = +c[1];
+    long = +c[2];
+    x = 30 + Math.round((long-info.minLong)*info.lfactor*info.scale);
+    y = 210 - Math.round((lat - info.minLat)*info.scale);
     g.lineTo(x,y);
-    }
-    if (!first) {
     var d = distance(olat,olong,lat,long);
     if (!isNaN(d)) dist+=d;
-    }
     olat = lat;
     olong = long;
     ox = x;
@@ -217,7 +213,7 @@ function plotTrack(info) {
   g.setFontAlign(0,0,3);
   g.drawString("Back",230,200);
   setWatch(function() {
-    viewTrack(info.fn);
+    viewTrack(info.fn, info);
   }, BTN3);
 }
 

apps/gpsrec/widget.js

@@ -41,7 +41,7 @@
   // Called by the GPS app to reload settings and decide what to do
   function reload() {
     settings = require("Storage").readJSON("gpsrec.json",1)||{};
-    settings.period = settings.period||1;
+    settings.period = settings.period||10;
     settings.file |= 0;
 
     Bangle.removeListener('GPS',onGPS);