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BangleApps
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Run: fixed distance calculation

master
hughbarney 2022-01-22 00:14:10 +00:00
parent 3b80c5e6a6
commit 8470049601
1 changed files with 23 additions and 9 deletions
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32
apps/run/app.js
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@ -5,6 +5,7 @@ var fontHeading = "6x8:2";
var fontValue = B2 ? "6x15:2" : "6x8:3";
var headingCol = "#888";
var running = false;
var fixCount = 0;
var startTime;
var startSteps;
// This & previous GPS readings
@ -102,8 +103,6 @@ var layout = new Layout( {
clearState();
layout.render();
function onTimer() {
layout.clock.label = locale.time(new Date(),1);
if (!running) {
@ -125,21 +124,36 @@ function onTimer() {
stepHistory[0]=0;
}
function radians(a) {
return a*Math.PI/180;
}
// distance between 2 lat and lons, in meters, Mean Earth Radius = 6371km
// https://www.movable-type.co.uk/scripts/latlong.html
function calcDistance(a,b) {
var x = radians(a.lon-b.lon) * Math.cos(radians((a.lat+b.lat)/2));
var y = radians(b.lat-a.lat);
return Math.round(Math.sqrt(x*x + y*y) * 6371000);
}
Bangle.on("GPS", function(fix) {
layout.gps.bgCol = fix.fix ? "#0f0" : "#f00";
lastGPS = thisGPS;
if (!fix.fix) { return; } // only process actual fixes
if (fixCount++ == 0) {
Bangle.buzz(); // first fix, does not need to respect quiet mode
lastGPS = fix; // initialise on first fix
}
thisGPS = fix;
if (running && fix.fix && lastGPS.fix) {
// work out distance - moving from a to b
var a = Bangle.project(lastGPS);
var b = Bangle.project(thisGPS);
var dx = a.x-b.x, dy = a.y-b.y;
var d = Math.sqrt(dx*dx+dy*dy); // this should be the distance in meters
if (running) {
var d = calcDistance(lastGPS, thisGPS);
distance += d;
layout.dist.label=locale.distance(distance);
var duration = Date.now() - startTime; // in ms
var speed = distance * 1000 / duration; // meters/sec
layout.pace.label = formatPace(speed);
lastGPS = fix;
}
});
Bangle.on("HRM", function(h) {