private RoutePoint GetNextPointOnRoute(GeoPosition position, Distance maxSkipDistance)
{
var last = GetLastWayPoint();
var skipDistance = 0d;
foreach (var routePoint in _route.GetEnumerable(NextWaypoint, NavigationDirection))
{
var expectedPosition = MapExtensions.ClosestPositionBetweenPoints(last, routePoint, position);
skipDistance += last.Distance(routePoint);
if (VisitedWaypoints.Contains(routePoint) || skipDistance > maxSkipDistance.Miles)
{
break;
}
if (IsOnRoute(expectedPosition, position))
{
return(last);
}
last = routePoint;
}
return(null);
}
public async Task SkipToCurrentLocation()
{
var position = (await _geoLocator.GetPositionAsync()).ToGeoPosition();
var expectedPosition = MapExtensions.ClosestPositionBetweenPoints(GetLastWayPoint(), NextWaypoint, position);
if (!IsOnRoute(expectedPosition, position))
{
var possibleSkip = GetNextPointOnRoute(position, Distance.FromKilometers(5));
if (possibleSkip != null)
{
do
{
ActivateNextWaypoint();
} while (GetLastWayPoint() != possibleSkip);
}
}
}
public void OnLocationUpdate(object sender, PositionEventArgs e)
{
var position = e.Position.ToGeoPosition();
var expectedPosition = MapExtensions.ClosestPositionBetweenPoints(GetLastWayPoint(), NextWaypoint, position);
var isOnRoute = IsOnRoute(expectedPosition, position);
if (!isOnRoute)
{
var possibleSkip = GetNextPointOnRoute(position, _maxSkippingDistance);
if (possibleSkip != null)
{
do
{
ActivateNextWaypoint();
} while (GetLastWayPoint() != possibleSkip);
}
else if (_showOffRouteMessage)
{
if (!(Application.Current.MainPage.Navigation.NavigationStack.LastOrDefault() is OffRoutePage))
{
Application.Current.MainPage.Navigation.PushAsync(new OffRoutePage(this));
}
}
}
if (HasArrivedAtWaypoint(position))
{
ActivateNextWaypoint();
if (GetLastWayPoint() is PointOfInterest poi)
{
ShowPointOfInterestModal(poi);
}
}
UpdateMap(position, expectedPosition, isOnRoute);
UpdateStats(GetLastWayPoint().Distance(expectedPosition));
}