WPF桌面下雪效果

寄存在canvas面板，目前缺点就是开始的时候效果有点别扭。

直接贴代码：

 1         void StartSnowing(Canvas panel)
 2         {
 3             Random random = new Random();
 4             Task.Factory.StartNew(new Action(() =>
 5             {
 6                 for (int j = 0; j < 10; j++)
 7                 {
 8                     Thread.Sleep(j * 100);
 9                     Dispatcher.Invoke(new Action(() =>
10                     {
11                         int snowCount = random.Next(0, 20);
12                         for (int i = 0; i < snowCount; i++)
13                         {
14                             int width = random.Next(10, 20);
15                             PackIconFontAwesome pack = new PackIconFontAwesome()
16                             {
17                                 Kind = PackIconFontAwesomeKind.SnowflakeRegular,
18                                 Width = width,
19                                 Height = width,
20                                 Foreground = Brushes.White,
21                                 BorderThickness = new Thickness(0),
22                                 RenderTransform = new RotateTransform(),
23                             };
24                             int left = random.Next(0, (int)panel.ActualWidth);
25                             Canvas.SetLeft(pack, left);
26                             panel.Children.Add(pack);
27                             int seconds = random.Next(10, 20);
28                             DoubleAnimationUsingPath doubleAnimation = new DoubleAnimationUsingPath()
29                             {
30                                 Duration = new Duration(new TimeSpan(0, 0, seconds)),
31                                 RepeatBehavior = RepeatBehavior.Forever,
32                                 PathGeometry = new PathGeometry(new List<PathFigure>() { new PathFigure(new Point(left, 0), new List<PathSegment>() { new LineSegment(new Point(left, panel.ActualHeight), false) }, false) }),
33                                 Source = PathAnimationSource.Y
34                             };
35                             pack.BeginAnimation(Canvas.TopProperty, doubleAnimation);
36                             DoubleAnimation doubleAnimation1 = new DoubleAnimation(360, new Duration(new TimeSpan(0, 0, 10)))
37                             {
38                                 RepeatBehavior = RepeatBehavior.Forever,
39 
40                             };
41                             pack.RenderTransform.BeginAnimation(RotateTransform.AngleProperty, doubleAnimation1);
42                         }
43                     }));
44                 }
45             }));
46         }

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