快速WPF粒子背景

<Canvas x:Name="canvas" Background="Black"/>

public partial class MainWindow : Window
{
    private List<Particle> particles;
    private Random random;

    public MainWindow()
    {
        InitializeComponent();
        particles = new List<Particle>();
        random = new Random();

        // 初始化粒子
        for (int i = 0; i < 100; i++)
        {
            Particle particle = new Particle();
            particles.Add(particle);
            canvas.Children.Add(particle.Shape);
        }

        // 启动动画
        CompositionTarget.Rendering += CompositionTarget_Rendering;
    }

    private void CompositionTarget_Rendering(object sender, EventArgs e)
    {
        // 更新粒子位置
        foreach (Particle particle in particles)
        {
            particle.Update();
        }
    }
}

public class Particle
{
    public Ellipse Shape { get; private set; }
    private double x, y;
    private double vx, vy;
    private double speed;

    public Particle()
    {
        Shape = new Ellipse
        {
            Width = 5,
            Height = 5,
            Fill = Brushes.White
        };

        // 初始化粒子位置和速度
        x = Canvas.GetLeft(Shape);
        y = Canvas.GetTop(Shape);
        vx = (2 * random.NextDouble() - 1) * 2;
        vy = (2 * random.NextDouble() - 1) * 2;
        speed = random.Next(1, 5);
    }

    public void Update()
    {
        // 更新粒子位置
        x += vx * speed;
        y += vy * speed;

        // 边界检测
        if (x < 0 || x > canvas.ActualWidth)
        {
            vx *= -1;
        }
        if (y < 0 || y > canvas.ActualHeight)
        {
            vy *= -1;
        }

        // 更新粒子在Canvas中的位置
        Canvas.SetLeft(Shape, x);
        Canvas.SetTop(Shape, y);
    }
}