winform 烟花代码

以下是一个简单的 WinForms 烟花效果代码示例：

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

namespace Fireworks
{
    public partial class Form1 : Form
    {
        private Random rand = new Random();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_MouseClick(object sender, MouseEventArgs e)
        {
            int count = rand.Next(10, 30);
            while (count-- > 0)
            {
                Particle p = new Particle(e.Location);
                p.Velocity = new Point(rand.Next(-4, 5), rand.Next(-10, -3));
                p.Color = Color.FromArgb(255, rand.Next(256), rand.Next(256), rand.Next(256));
                particles.Add(p);
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            using (Graphics g = this.CreateGraphics())
            {
                g.Clear(Color.Black);
                foreach (Particle p in particles)
                {
                    p.Update();
                    p.Draw(g);
                }
                particles.RemoveAll(p => p.IsDead);
            }
        }
    }

    public class Particle
    {
        private const int GRAVITY = 1;

        public Point Location { get; set; }
        public Point Velocity { get; set; }
        public Color Color { get; set; }
        public bool IsDead { get; set; }

        public Particle(Point location)
        {
            this.Location = location;
        }

        public void Update()
        {
            Velocity.Y += GRAVITY;
            Location.X += Velocity.X;
            Location.Y += Velocity.Y;
            IsDead = Location.Y > 600;
        }

        public void Draw(Graphics g)
        {
            g.FillEllipse(new SolidBrush(Color), Location.X, Location.Y, 4, 4);
        }
    }
}

在 Form 的 MouseClick 事件中创建多个颗粒，每个颗粒都有一个随机速度和随机颜色。在计时器的 Tick 事件中更新并绘制所有颗粒，并删除死亡的颗粒。颗粒的更新和绘制在 Particle 类中完成。