教你如何用WPF实现文字粒子闪烁动画效果

本文实例为大家分享了WPF实现文字粒子闪烁动画的具体代码，供大家参考，具体内容如下

实现效果如下：

首先根据显示文本创建文本路径Geometry，然后在路径内随机生成圆形粒子并添加动画。

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 < particleCount; i++)
      {
        double size = random.Next(sizeMin, sizeMax + 1);
        while(true)
        {
          Point po = new Point(random.Next((int)particleGeometry.Bounds.Left, (int)particleGeometry.Bounds.Right), random.Next((int)particleGeometry.Bounds.Top, (int)particleGeometry.Bounds.Bottom));
          if (particleGeometry.FillContains(po, 2, ToleranceType.Absolute))
          {
            Particle p = new Particle
            {
              Shape = new Ellipse
              {
                Width = size,
                Height = size,
                Stretch = System.Windows.Media.Stretch.Fill,
                Fill = GetRandomColorBursh(),
              },
              Position = po,
            };
            SetParticleSizeAnimation(p.Shape);
            particles.Add(p);
            Canvas.SetLeft(p.Shape, p.Position.X);
            Canvas.SetTop(p.Shape, p.Position.Y);
            containerParticles.Children.Add(p.Shape);
            break;
          }
        }
      }
    }
  
    /// 

    /// 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;
}

以上就是本文的全部内容，希望对大家的学习有所帮助。