public async Task <double> Handle(CreateAndCalculateDistanceCommand request, CancellationToken cancellationToken)
{
double R = 6371; // km
double sLat1 = Math.Sin(ToRadians(request.Lat1));
double sLat2 = Math.Sin(ToRadians(request.Lat2));
double cLat1 = Math.Cos(ToRadians(request.Lat1));
double cLat2 = Math.Cos(ToRadians(request.Lat2));
double cLon = Math.Cos(ToRadians(request.Lon1) - ToRadians(request.Lon2));
double cosD = sLat1 * sLat2 + cLat1 * cLat2 * cLon;
double d = Math.Acos(cosD);
double dist = R * d;
var entity = new UserDistance
{
FromPoint = new Domain.Location
{
Latitude = request.Lat1,
Longitude = request.Lon1
},
ToPoint = new Domain.Location
{
Latitude = request.Lat2,
Longitude = request.Lon2,
},
Distance = dist,
UserId = _currentUserService.UserId,
Created = DateTime.Now,
LastModified = DateTime.Now,
};
_db.UserDistances.Add(entity);
await _db.SaveChangesAsync(cancellationToken);
return(dist);
}
