1 | initial version |
To calculate the velocity of a vehicle in Flutter using GPS, you can follow these steps:
geolocator
package to get the location of the device periodically.distanceBetween
method.Here's some sample code that demonstrates this approach:
import 'package:geolocator/geolocator.dart';
import 'dart:async';
class VelocityCalculator {
Position _previousPosition;
double _velocity = 0;
Future<Position> _getCurrentPosition() async {
return await Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
}
void startCalculatingVelocity() async {
// get the initial position as the previous position
_previousPosition = await _getCurrentPosition();
// start listening for position changes
StreamSubscription<Position> positionStream = Geolocator.getPositionStream().listen((Position currentPosition) {
// calculate the distance between current and previous position
double distance = Geolocator.distanceBetween(
_previousPosition.latitude,
_previousPosition.longitude,
currentPosition.latitude,
currentPosition.longitude,
);
// calculate the time difference between current and previous position
double timeDifferenceInSeconds = (currentPosition.timestamp.millisecondsSinceEpoch -
_previousPosition.timestamp.millisecondsSinceEpoch) /
1000;
// calculate the velocity
_velocity = distance / timeDifferenceInSeconds;
// set the current position as previous for next calculation
_previousPosition = currentPosition;
});
}
double getCurrentVelocity() {
return _velocity;
}
}
You can start the velocity calculation by calling the startCalculatingVelocity
method and get the current velocity by calling the getCurrentVelocity
method.