distance calculator

main.dart

import 'dart:math';

void main() {
  double distance = calculateDistance(
      startLat: 25.285446,
      startLong: 51.531040,
      endLat: 25.285446,
      endLong: 51.531040);
  print(distance);

  if (distance <= 5000) {
    print("enable the function");
  } else {
    print("disable the function");
  }
}

double calculateDistance(
    {required double startLat,
    required double startLong,
    required double endLat,
    required double endLong}) {
  const double earthRadius = 6371;

  double startLatRad = degreesToRadians(startLat);
  double startLongRad = degreesToRadians(startLong);
  double endLatRad = degreesToRadians(endLat);
  double endLongRad = degreesToRadians(endLong);

  double latDiff = endLatRad - startLatRad;
  double longDiff = endLongRad - startLongRad;

  // Calculate distance using Haversine formula
  double a = pow(sin(latDiff / 2), 2) +
      cos(startLatRad) * cos(endLatRad) * pow(sin(longDiff / 2), 2);
  double c = 2 * atan2(sqrt(a), sqrt(1 - a));
  double distance = earthRadius * c; // Distance in kilometers
  return distance;
}

// Function to convert degrees to radians
double degreesToRadians(double degrees) {
  return degrees * pi / 180;
}