Silverlight实现星星闪烁动画

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes; 
 
namespace RandEllipseSample
{
  public partial class MainPage : UserControl
  {
    int shapesCount = 500; //图形数组的容量
    //随机大小的上限
    int theMaxW = 1300;
    int theMaxH = 720;
    Random rand = null;
    Storyboard story = null;
    Ellipse[] myShapes = null;
    public MainPage()
    {
      InitializeComponent();
      rand = new Random();
      story = new Storyboard();
      story.Completed += new EventHandler(story_Completed);
      InitShapes();
      InitAnimation();
      //加载完成后马上播放动画
      this.Loaded += new RoutedEventHandler(MainPage_Loaded);
    } 
 
    void MainPage_Loaded(object sender, RoutedEventArgs e)
    {
      story.Begin();
    } 
 
    void story_Completed(object sender, EventArgs e)
    {
      for (int x = 0; x 
    /// 初始化形状数组
    /// 
    private void InitShapes()
    {
      myShapes = new Ellipse[shapesCount];
      //实例化所有成员
      for (int n = 0; n 
    /// 初始化动画
    /// 
    private void InitAnimation()
    {
      story.Children.Clear();
      for (int i = 0; i