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,new Point(250,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); 
    } 
  }