WPF实现画线动画效果

/// <summary>   /// Window2.xaml 的交互逻辑   /// </summary>   public partial class Window2 : Window   {     public Window2()     {       InitializeComponent();       var canvas = new Canvas();       Content = canvas;       var points =         new List<Point>()         {           new Point(10, 10),           new Point(90, 90),           new Point(60, 10),           new Point(250, 90),           new Point(10, 10)         };       var sb = new Storyboard();       for (int i = 0; i < points.Count - 1; i++)       {         var lineGeometry = new LineGeometry(points[i], points[i]);         var path =           new Path()           {             Stroke = Brushes.Black,             StrokeThickness = 2,             Data = lineGeometry           };         canvas.Children.Add(path);         var animation =           new PointAnimation(points[i], points[i + 1], new Duration(TimeSpan.FromMilliseconds(1000)))           {             BeginTime = TimeSpan.FromMilliseconds(i * 1010)           };         sb.Children.Add(animation);         RegisterName("geometry" + i, lineGeometry);         Storyboard.SetTargetName(animation, "geometry" + i);         Storyboard.SetTargetProperty(animation, new PropertyPath(LineGeometry.EndPointProperty));       }       MouseDown += (s, e) => sb.Begin(this);     }   }