Silverlight 圣诞节下雪效果

概述       记得原来博客园有人写过下雪的程序，今天正好是平安夜大家看看这个下雪效果如何：     Blend Behavior代码如下： public class FallingSnowBehavior : Behavior<Canvas> { private static Random randomNumber; protected override void OnAtt

       记得原来博客园有人写过下雪的程序，今天正好是平安夜大家看看这个下雪效果如何：

 

 

Blend Behavior代码如下：

public class FallingSNowBehavior : Behavior<Canvas>  {     private static Random randomNumber;       protected overrIDe voID OnAttached()     {        base.OnAttached();          randomNumber = new Random();          this.Associatedobject.Loaded += new RoutedEventHandler(ApplicationLoaded);     }       voID ApplicationLoaded(object sender,RoutedEventArgs e)     {        foreach (FrameworkElement element in this.Associatedobject.Children)        {            FrameworkElement localcopy = element;              double yposition = Canvas.Gettop(localcopy);            double xposition = Canvas.Getleft(localcopy);              double speed = 2 * randomNumber.NextDouble();            double counter = 0;            double radius = 30 * speed * randomNumber.NextDouble();              localcopy.Opacity = 0.2 + randomNumber.NextDouble();              CompositionTarget.Rendering += delegate(object o,EventArgs arg)            {                counter += Math.PI / (180 * speed);                  if (yposition < Application.Current.RootVisual.DesiredSize.Height)                {                    yposition += 0.2 + speed;                }                else                {                    yposition = -localcopy.Height;                }                  Canvas.Settop(localcopy,yposition);                Canvas.Setleft(localcopy,xposition + radius * Math.Cos(counter));            };        }     }       protected overrIDe voID OnDetaching()     {        base.OnDetaching();     }  }@H_403_102@ 
源代码下载
 
 
 
参考资料
 http://www.kirupa.com/blend_silverlight/falling_sNow_silverlight_pg1.htm                            	          总结       
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