Question

我希望Windows Phone上的地图控件逐个在坐标之间移动。我似乎无法让地图控件等到动画完成到达一个位置，然后再尝试移动到下一个位置。我已经尝试了几种方法让它在两个动作之间等待无济于事。这是我到目前为止的示例应用程序的代码。

public MainPage()
    {
        InitializeComponent();
        map.Center = new GeoCoordinate(54.958879, -7.733027);
        map.ZoomLevel = 13;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        List<Location> locations = new List<Location>();

        for (double x = 0, y = 0; y < 10; x+=0.005, y++)
        {
            locations.Add(new Location(54.958879 + x, -7.733027 + x));
            locations.Add(new Location(54.958879 - x, -7.733027 - x));
        }

        foreach (Location location in locations)
        {
            map.SetView(new GeoCoordinate(location.Latitude, location.Longitude), 13, MapAnimationKind.Linear);   
//I want the app to wait until this view has finished moving before moving again 
        }
    }

    class Location
    {
        public double Latitude { get; set; }
        public double Longitude { get; set; }

        public Location(double lat, double lon)
        {
            Latitude = lat;
            Longitude = lon;
        }
    }

我确信我错过了一些简单的事情。有人可以帮助解决这个问题吗？

Answer 1

我会使用DispatcherTimer并在Tick事件中，迭代到下一个坐标，然后拨打SetView。

例如：

private DispatcherTimer timer;
private int index = 0;
List<Location> locations = new List<Location>();
public MainPage()
{
    InitializeComponent();
    timer = new System.Windows.Threading.DispatcherTimer
    {
        Interval = TimeSpan.FromSeconds(1) // TODO: your interval
    };
    timer.Tick += timer_Tick;
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    locations.Clear();
    for (double x = 0, y = 0; y < 10; x+=0.005, y++)
    {
        locations.Add(new Location(54.958879 + x, -7.733027 + x));
        locations.Add(new Location(54.958879 - x, -7.733027 - x));
    }
    timer.Start();
}

void timer_Tick(object sender, EventArgs e)
{
    var item = locations[index];
    map.SetView(new Geocoordinate(item.Latitude, item.Longitude), 13, MapAnimationKind.Linear);
    if(index >= locations.Count)
        timer.Stop();
    else
        index++;
}

Windows Phone 8基于一系列坐标映射增量移动

1 个答案: