computeDistanceSphericalLawCosines function
Compute distance between 2 points according to Spherical law of cosines.
Implementation
num computeDistanceSphericalLawCosines(
LatLng p1,
LatLng p2, {
num radius = earthRadius,
}) {
final cosLat1 = cos(degToRad(p1.lat));
final sinLat1 = sin(degToRad(p1.lat));
final cosLat2 = cos(degToRad(p2.lat));
final sinLat2 = sin(degToRad(p2.lat));
return radius *
acos(cosLat1 * cosLat2 * cos(degToRad(p1.lng) - degToRad(p2.lng)) +
sinLat1 * sinLat2);
}