public static LocationRectangle SetCenter(LocationRectangle rect, GeoCoordinate center)
{
double north, west, south, east;
if (rect.North - center.Latitude < center.Latitude - rect.South)
{
north = center.Latitude + center.Latitude - rect.South;
south = rect.South;
}
else
{
north = rect.North;
south = center.Latitude - (rect.North - center.Latitude);
}
if (rect.East - center.Longitude < center.Longitude - rect.West)
{
west = rect.West;
east = center.Longitude + (center.Longitude - rect.West);
}
else
{
west = center.Longitude - (rect.East - center.Longitude);
east = rect.East;
}
return(new LocationRectangle(north, west, south, east));
}
private async void SetBoundaries(IMapControl map, LocationRectangle boundaries, bool noStopInParameter)
{
await Task.Delay(250);
await initializeMapLabels(map);
await map.TrySetViewBoundsAsync(boundaries, false);
//while (page.ZoomLevel < 15)
//{
// page.SetView(boundaries, MapAnimationKind.None);
// await Task.Delay(100);
//}
//while (page.IsMapEmpty)
//{
// initializeMapLabels(page);
// await Task.Delay(100);
//}
map.CenterChanged += async(sender, args) =>
{
await mapFillingLock.WaitAsync();
if (map.ZoomLevel >= App.Config.LowStopsMapLevel)
{
await tryCreateStopLabelsAt(map, map.Center);
}
else if (map.ZoomLevel >= App.Config.HighStopsMapLevel)
{
await tryCreateHighStopLabelsAt(map, map.Center);
clearMap(map, 2.1);
}
else
{
clearMap(map);
}
mapFillingLock.Release();
};
if (isNear && noStopInParameter && mainPoints.Length == 0)
{
var nearestResult = await StopTransfers.GetNearestStop(CurrentLocation.Last);
if (nearestResult != null)
{
this.location = CurrentLocation.Last;
this.mainPoints = nearestResult.Stop.Group.Stops.Select(s => s.Coordinate).ToArray();
var boundAddition = new GeoCoordinate[] { CurrentLocation.Last ?? App.Config.CenterLocation };
boundaries = calculateBoundaries(mainPoints.Concat(boundAddition));
await map.TrySetViewBoundsAsync(boundaries, false);
await initializeMapLabels(map);
}
}
}
public static LocationRectangle WidenBoundaries(LocationRectangle rect)
{
var center = rect.Center;
double latUnit = 150.0 / App.Config.LatitudeDegreeDistance;
double lonUnit = 150.0 / App.Config.LongitudeDegreeDistance;
LocationRectangle widedRect = new LocationRectangle(
north: Math.Max(rect.North, rect.Center.Latitude + latUnit),
south: Math.Min(rect.South, rect.Center.Latitude - latUnit),
east: Math.Max(rect.East, rect.Center.Longitude + lonUnit),
west: Math.Min(rect.West, rect.Center.Longitude - lonUnit)
);
return(widedRect);
}