WPF实现文字粒子闪烁动画效果

public class Particle
 {
  /// 

  /// 形状
  /// 
  public Ellipse Shape;
  /// 

  /// 坐标
  /// 
  public Point Position;
}

/// 

/// 粒子路径
/// 
private Geometry particleGeometry;
 
/// 

/// 粒子个数
/// 
private int particleCount = 100;
 
/// 

/// 粒子最小尺寸
/// 
private static int sizeMin = 10;
 
/// 

/// 粒子最大尺寸
/// 
private int sizeMax = 20;
 
/// 

/// 随机数
/// 
private Random random;
 
/// 

/// 粒子列表
/// 
private List particles;
 
/// 

/// 粒子容器
/// 
private Canvas containerParticles;
 
 
  public ParticleSystem(Geometry _path, int _maxRadius, int _particleCount, Canvas _containerParticles)
  {
   particleGeometry = _path;
   particleCount = _particleCount;
   sizeMax = _maxRadius;
   cOntainerParticles= _containerParticles;
   random = new Random();
   particles = new List();
   SpawnParticle();
  }
 
  /// 

  /// 初始化粒子
  /// 
  private void SpawnParticle()
  {
   //清空粒子队列
   particles.Clear();
   containerParticles.Children.Clear();
 
   //生成粒子
   for (int i = 0; i 
  /// 设置粒子大小动画
  /// 
  private void SetParticleSizeAnimation(Ellipse p)
  {
   Storyboard sb = new Storyboard();
   //动画完成事件 再次设置此动画
   sb.Completed += (S, E) =>
   {
    SetParticleSizeAnimation(p);
   };
   int size = random.Next(sizeMin, sizeMax + 1);
   int time = random.Next(100, 1000);
   DoubleAnimation daX = new DoubleAnimation(size, new Duration(TimeSpan.FromMilliseconds(time)));
   DoubleAnimation daY = new DoubleAnimation(size, new Duration(TimeSpan.FromMilliseconds(time)));
   Storyboard.SetTarget(daX, p);
   Storyboard.SetTarget(daY, p);
   Storyboard.SetTargetProperty(daX, new PropertyPath("Width"));
   Storyboard.SetTargetProperty(daY, new PropertyPath("Height"));
   sb.Children.Add(daX);
   sb.Children.Add(daY);
   sb.Begin();
  }
 
  /// 

  /// 获取随机颜色画刷
  /// 
  private SolidColorBrush GetRandomColorBursh()
  {
   byte r = (byte)random.Next(128, 256);
   byte g = (byte)random.Next(128, 256);
   byte b = (byte)random.Next(128, 256);
   return new SolidColorBrush(Color.FromArgb(125, r, g, b));
}

private ParticleSystem ps;
 
public MainWindow()
  {
   InitializeComponent();
   this.Loaded += MainWindow_Loaded;
  }
 
  private void MainWindow_Loaded(object sender, RoutedEventArgs e)
  {
   Geometry g = CreateTextPath("H E L L O", new Point(this.cvs_particleContainer.Margin.Left, this.cvs_particleContainer.Margin.Top), new Typeface(new FontFamily("Arial"), FontStyles.Normal, FontWeights.Bold, FontStretches.Normal), 200);
   ps = new ParticleSystem(g, 25, 350, this.cvs_particleContainer);
  }
 
  /// 

  /// 创建文本路径
  /// 
  /// 文本字符串
  /// 显示位置
  /// 字体信息
  /// 字体大小
  /// 
  private Geometry CreateTextPath(string word, Point point, Typeface typeface, int fontSize)
  {
   FormattedText text = new FormattedText(word, new System.Globalization.CultureInfo("en-US"), FlowDirection.LeftToRight, typeface, fontSize, Brushes.Black);
   Geometry g = text.BuildGeometry(point);
   PathGeometry path = g.GetFlattenedPathGeometry();
   return path;
}