public async Task <int> Save(MyFriendPosition myFriendPosition)
{
if (myFriendPosition.MyFriendPositionId > 0)
{
_context.Update(myFriendPosition);
return(await _context.SaveChangesAsync());
}
else
{
_context.Add(myFriendPosition);
return(await _context.SaveChangesAsync());
}
}
private List <MyFriendPosition> CalcTop3FriendsNearMyCurrentPosition(List <MyFriendPosition> myFriendsPositions, MyFriendPosition myVisitedFriendPosition)
{
List <MyFriendPosition> myFriendPositionsFinalResult = new List <MyFriendPosition>();
myFriendPositionsFinalResult.Add(myVisitedFriendPosition);
foreach (var myFriendPosition in myFriendsPositions)
{
if (myFriendPosition == myVisitedFriendPosition)
{
continue;
}
var aElevated2 = Math.Pow((myVisitedFriendPosition.Latitude - myFriendPosition.Latitude), 2);
var bElevated2 = Math.Pow((myVisitedFriendPosition.Longitude - myFriendPosition.Longitude), 2);
var sqrtA2B2 = Math.Sqrt(aElevated2 + bElevated2);
myFriendPosition.Calc = sqrtA2B2;
myFriendPositionsFinalResult.Add(myFriendPosition);
}
var friendNearMeOrderedByDistance = myFriendPositionsFinalResult.OrderBy(mfpKeyValue => mfpKeyValue.Calc).Take(3).ToList();
return(friendNearMeOrderedByDistance);
}
