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); 
 } 
 }