用c#写一个烟花绽放的代码

以下是一个简单的 C# 烟花绽放的代码示例：

using System;
using System.Drawing;
using System.Windows.Forms;

namespace Fireworks
{
    public partial class Form1 : Form
    {
        private Graphics g;
        private SolidBrush brush;
        private Random rand;

        private int particles = 100;
        private int particleSize = 5;
        private int particleSpeed = 4;
        private int particleGravity = 5;

        private Point origin;
        private int explosionSize = 200;
        private int explosionSpeed = 10;

        private Timer timer;

        public Form1()
        {
            InitializeComponent();
            rand = new Random();
            brush = new SolidBrush(Color.White);
            g = this.CreateGraphics();
            timer = new Timer();
            timer.Interval = 20;
            timer.Tick += new EventHandler(timer_Tick);
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            g.Clear(Color.Black);
            for (int i = 0; i < particles; i++)
            {
                Particle p = new Particle(origin, particleSize, particleSpeed, particleGravity);
                g.FillEllipse(brush, p.Location.X, p.Location.Y, p.Size, p.Size);
                if (p.Location.Y >= this.Height)
                {
                    p.Speed = -p.Speed;
                    p.Speed *= 0.75f;
                }
            }

            explosionSize += explosionSpeed;
            if (explosionSize >= 400)
            {
                timer.Stop();
                explosionSize = 200;
            }
        }

        private void Form1_MouseClick(object sender, MouseEventArgs e)
        {
            origin = e.Location;
            timer.Start();
        }
    }

    public class Particle
    {
        public Point Location { get; set; }
        public int Size { get; set; }
        public float Speed { get; set; }
        public float Gravity { get; set; }

        public Particle(Point location, int size, float speed, float gravity)
        {
            Location = location;
            Size = size;
            Speed = speed;
            Gravity = gravity;
            Location.Offset(rand.Next(-50, 50), rand.Next(-50, 50));
        }

        public void Update()
        {
            Location.Offset(0, (int)(Speed));
            Speed += Gravity;
        }
    }
}

在窗体上单击鼠标左键即可触发烟花绽放。该代码使用了粒子系统来模拟烟花的效果。每个粒子都有一个起始点和速度，然后在重力的影响下移动，直到到达地面。烟花绽放时，会在起始点产生一定数量的粒子，然后逐渐扩散，直到达到最大尺寸为止。