/// <summary>
///
/// </summary>
/// <param name="gpsManager"></param>
/// <param name="center"></param>
/// <param name="radius"></param>
/// <param name="cancelToken"></param>
/// <returns>Returns null if current position could not be determined - else returns true if in region, false otherwise</returns>
public static async Task <bool?> IsInsideRegion(this IGpsManager gpsManager, Position center, Distance radius, CancellationToken cancelToken = default)
{
var result = await gpsManager.GetCurrentPosition().ToTask(cancelToken);
var inside = result.Position.GetDistanceTo(center) < radius;
return(inside);
}
/// <summary>
/// Gets the last reading (can be filtered out by maxAgeOfLastReading) otherwise request the current reading
/// </summary>
/// <param name="gpsManager"></param>
/// <param name="maxAgeOfLastReading"></param>
/// <returns></returns>
public static IObservable <IGpsReading> GetLastReadingOrCurrentPosition(this IGpsManager gpsManager, DateTime?maxAgeOfLastReading = null) => Observable.FromAsync <IGpsReading>(async ct =>
{
var reading = await gpsManager.GetLastReading().ToTask(ct);
if (reading == null || (maxAgeOfLastReading != null && reading.Timestamp < maxAgeOfLastReading.Value))
{
reading = await gpsManager.GetCurrentPosition().ToTask(ct);
}
return(reading);
});