GPS Location

npm install despia-native

import despia from 'despia-native';

// With server endpoint (sends updates to your API)
despia("location://?server=https://api.example.com/track&buffer=10");

// Without server (local storage only)
despia("location://?buffer=5");

const data = await despia("stoplocation://", ["locationSession"]);
const locations = data.locationSession;
// Stop tracking & update state
console.log(locations);

[
    {
        "latitude": 25.276987,
        "longitude": 55.296249,
        "timestamp": 1737219125.5,
        "gpsTimestamp": 1737219125.3,
        "speed": 2.5,
        "course": 87.3,
        "altitude": 12.4,
        "horizontalAccuracy": 5.2,
        "verticalAccuracy": 3.8
    },
    {
        "latitude": 25.277123,
        "longitude": 55.296401,
        "timestamp": 1737219135.7,
        "gpsTimestamp": 1737219135.5,
        "speed": 3.1,
        "course": 89.7,
        "altitude": 12.6,
        "horizontalAccuracy": 4.8,
        "verticalAccuracy": 3.5
    },
    {
        "latitude": 25.277289,
        "longitude": 55.296587,
        "timestamp": 1737219145.9,
        "gpsTimestamp": 1737219145.7,
        "speed": null,
        "course": null,
        "altitude": 12.3,
        "horizontalAccuracy": 6.1,
        "verticalAccuracy": 4.2
    }
]

const data = await despia("stoplocation://", ["locationSession"]);
const locations = data.locationSession;

// Filter for high-accuracy locations only
const accurateLocations = locations.filter(loc => loc.horizontalAccuracy < 10);

// Calculate total distance traveled (simple method)
function calculateDistance(lat1, lon1, lat2, lon2) {
    const R = 6371000; // Earth's radius in meters
    const φ1 = lat1 * Math.PI / 180;
    const φ2 = lat2 * Math.PI / 180;
    const Δφ = (lat2 - lat1) * Math.PI / 180;
    const Δλ = (lon2 - lon1) * Math.PI / 180;
    
    const a = Math.sin(Δφ/2) * Math.sin(Δφ/2) +
              Math.cos(φ1) * Math.cos(φ2) *
              Math.sin(Δλ/2) * Math.sin(Δλ/2);
    const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
    
    return R * c; // Distance in meters
}

let totalDistance = 0;
for (let i = 1; i < accurateLocations.length; i++) {
    const prev = accurateLocations[i - 1];
    const curr = accurateLocations[i];
    totalDistance += calculateDistance(
        prev.latitude, prev.longitude,
        curr.latitude, curr.longitude
    );
}

console.log(`Total distance: ${(totalDistance / 1000).toFixed(2)} km`);

// Check if user is moving
const isMoving = locations.some(loc => loc.speed && loc.speed > 0.5);
console.log(`User is ${isMoving ? 'moving' : 'stationary'}`);