private double CalculateWithHaversine(Position position, AlarmLocation alarmLocation)
{
var R = 6371d;
var currentLatitude = position.Latitude;
var currentLongitude = position.Longitude;
var alarmLatitude = alarmLocation.Latitude;
var alarmLongitude = alarmLocation.Longitude;
var differenceLatitudes = ToRadius(alarmLatitude - currentLatitude);
var differenceLongitudes = ToRadius(alarmLongitude - currentLongitude);
var a = Math.Sin(differenceLatitudes / 2d) * Math.Sin(differenceLatitudes / 2d) +
Math.Cos(ToRadius(currentLatitude)) * Math.Cos(ToRadius(alarmLatitude)) *
Math.Sin(differenceLongitudes / 2d) * Math.Sin(differenceLongitudes / 2d);
var c = 2d * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1d - a));
return(R * c);
}
private async void SaveAlarmAsync()
{
if (!string.IsNullOrEmpty(Name) && Distance > 0)
{
try
{
var location = (await Geocoding.GetLocationsAsync(Name)).FirstOrDefault();
if (location != null)
{
var newLocationAlarm = new AlarmLocation(Name, Distance,
location.Latitude, location.Longitude, true);
await mainPageFeatures.AddAlarmAsync(newLocationAlarm);
UserDialogs.Instance.Toast("Zapisano alarm.", TimeSpan.FromSeconds(3.0));
Debug.WriteLine(newLocationAlarm.ToString());
}
else
{
UserDialogs.Instance.Toast("Nie można zapisać alarmu. Sprawdź miejsce docelowe.", TimeSpan.FromSeconds(3.0));
}
}
catch (FeatureNotSupportedException fnsEx)
{
Debug.WriteLine(fnsEx.Message);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
else
{
UserDialogs.Instance.Toast("Nie można zapisać alarmu.", TimeSpan.FromSeconds(3.0));
}
}
public async Task RemoveAlarmAsync(AlarmLocation alarmlocation)
{
await DbConnection.CreateTableAsync <AlarmLocation>();
await DbConnection.DeleteAsync(alarmlocation);
}
public async Task UpdateAlarmAsync(AlarmLocation alarmLocation)
{
await DbConnection.CreateTableAsync <AlarmLocation>();
await DbConnection.UpdateAsync(alarmLocation);
}
public async Task AddAlarmAsync(AlarmLocation alarmLocation)
{
await DbConnection.CreateTableAsync <AlarmLocation>();
await DbConnection.InsertAsync(alarmLocation);
}
public async Task AddAlarmAsync(AlarmLocation alarmLocation)
{
gpsListener.AddObserver(alarmLocation.Id);
await alarmDatabase.AddAlarmAsync(alarmLocation);
}
private double CalculateDistance(Position position, AlarmLocation alarmLocation)
{
return(CalculateWithHaversine(position, alarmLocation));
}
