MapControl の表示を良い感じにするやつ

MainPage.xaml.cs

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        this.Map.Loaded += Map_Loaded;

        base.OnNavigatedTo(e);
    }

    private async void Map_Loaded(object sender, RoutedEventArgs e)
    {
        await ApplyMapView(new[]
        {
            new Windows.Devices.Geolocation.BasicGeoposition{Latitude = 35.75, Longitude = 139.79 },
            new Windows.Devices.Geolocation.BasicGeoposition{Latitude = 35.80, Longitude = 139.81 },
            new Windows.Devices.Geolocation.BasicGeoposition{Latitude = 35.81, Longitude = 139.81 },
            new Windows.Devices.Geolocation.BasicGeoposition{Latitude = 35.84, Longitude = 139.84 }
        });
    }

    public async Task ApplyMapView(IEnumerable<Windows.Devices.Geolocation.BasicGeoposition> positions)
    {
        // 与えられた位置情報から北東・南西・中心の位置を割り出す
        var boundingBox = Windows.Devices.Geolocation.GeoboundingBox.TryCompute(positions);

        // さいしょ
        var mapStartPin = new Windows.UI.Xaml.Controls.Maps.MapIcon
        {
            Location = new Windows.Devices.Geolocation.Geopoint(positions.First()),
            NormalizedAnchorPoint = new Point(0.5, 0.5)
        };
        // おわり
        var mapEndPin = new Windows.UI.Xaml.Controls.Maps.MapIcon
        {
            Location = new Windows.Devices.Geolocation.Geopoint(positions.Last()),
            NormalizedAnchorPoint = new Point(0.5, 0.5)
        };
        // 軌跡
        var line = new Windows.UI.Xaml.Controls.Maps.MapPolyline
        {
            Path = new Windows.Devices.Geolocation.Geopath(positions),
            StrokeColor = Colors.Blue,
            StrokeThickness = 2,
        };

        this.Map.MapElements.Add(line);
        this.Map.MapElements.Add(mapStartPin);
        this.Map.MapElements.Add(mapEndPin);

        // 範囲に収める
        await this.Map.TrySetViewBoundsAsync(boundingBox, new Thickness(100), Windows.UI.Xaml.Controls.Maps.MapAnimationKind.Default);
    }
}