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   源码介绍

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雪花桌面

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Snow
{
    public partial class Form1 : Form
    {
        private static readonly Random rand = new Random();
        private readonly List<SnowFlake> SnowFlakes = new List<SnowFlake>();
        private int Tick = 0;
        private class SnowFlake
        {
            public float Rotation;
            public float RotVelocity;
            public float Scale;
            public float X;
            public float XVelocity;
            public float Y;
            public float YVelocity;
            public Image image;
        }

        Image screenImage;

        public Form1()
        {
            InitializeComponent();
            SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer, true);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            screenImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
        }

        private void SetBackground(Image img)
        {
            try
            {
                Bitmap bitmap = (Bitmap)img;
                if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
                {
                    throw new ApplicationException();
                }
                IntPtr hObject = IntPtr.Zero;
                IntPtr zero = IntPtr.Zero;
                IntPtr hDC = Win32.GetDC(IntPtr.Zero);
                IntPtr ptr2 = Win32.CreateCompatibleDC(hDC);
                try
                {
                    hObject = bitmap.GetHbitmap(Color.FromArgb(0));
                    zero = Win32.SelectObject(ptr2, hObject);
                    Win32.Size size2 = new Win32.Size(bitmap.Width, bitmap.Height);
                    Win32.Size psize = size2;
                    Win32.Point point3 = new Win32.Point(0, 0);
                    Win32.Point pprSrc = point3;
                    point3 = new Win32.Point(base.Left, base.Top);
                    Win32.Point pptDst = point3;
                    Win32.BLENDFUNCTION pblend = new Win32.BLENDFUNCTION();
                    pblend.BlendOp = 0;
                    pblend.BlendFlags = 0;
                    pblend.SourceConstantAlpha = 0xff;
                    pblend.AlphaFormat = 1;
                    Win32.UpdateLayeredWindow(this.Handle, hDC, ref pptDst, ref psize, ptr2, ref pprSrc, 0, ref pblend, 2);
                }
                catch (Exception exception1)
                {
                    Exception exception = exception1;
                    throw exception;
                }
                finally
                {
                    Win32.ReleaseDC(IntPtr.Zero, hDC);
                    if (hObject != IntPtr.Zero)
                    {
                        Win32.SelectObject(ptr2, zero);
                        Win32.DeleteObject(hObject);
                    }
                    Win32.DeleteDC(ptr2);
                }
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message);
            }
        }

        protected override System.Windows.Forms.CreateParams CreateParams
        {
            get
            {
                System.Windows.Forms.CreateParams createParams = base.CreateParams;
                createParams.ExStyle |= 0x80000;
                return createParams;
            }
        }


        private void toolStripMenuItem1_Click(object sender, EventArgs e)
        {
            this.Dispose();
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            Tick  ;

            if (Tick % 10 == 0)
            {
                SnowFlake s = new SnowFlake();
                Random rd = new Random();
                s.X = rand.Next(-20, this.Width   20);
                s.Y = 0f;
                s.XVelocity = (float)(rand.NextDouble() - 0.5f) * 2f;
                s.YVelocity = (float)(rand.NextDouble() * 3)   1f;
                s.Rotation = rand.Next(0, 359);
                s.RotVelocity = rand.Next(-3, 3) * 2;
                s.image = Image.FromFile(@"Resources\"   rd.Next(1, 4)   ".gif");
                if (s.RotVelocity == 0)
                {
                    s.RotVelocity = 3;
                }
                s.Scale = (float)(rand.NextDouble() / 2)   0.75f;
                SnowFlakes.Add(s);
            }

            Graphics g = Graphics.FromImage(screenImage);
            g.Clear(Color.Transparent);
            g.SmoothingMode = SmoothingMode.HighSpeed;

            for (int i = 0; i < SnowFlakes.Count; i  )
            {
                SnowFlake s1 = SnowFlakes[i];
                s1.X  = s1.XVelocity;
                s1.Y  = s1.YVelocity;
                s1.Rotation  = s1.RotVelocity;
                s1.XVelocity  = ((float)rand.NextDouble() - 0.5f) * 0.7f;
                s1.XVelocity = Math.Max(s1.XVelocity, -2f);
                s1.XVelocity = Math.Min(s1.XVelocity,  2f);

                if (s1.Y > this.Height)
                {
                    SnowFlakes.RemoveAt(i);
                }
                else
                {

                    g.ResetTransform();
                    g.TranslateTransform(-16, -16, MatrixOrder.Append); //pan
                    g.ScaleTransform(s1.Scale, s1.Scale, MatrixOrder.Append); //scale
                    g.RotateTransform(s1.Rotation, MatrixOrder.Append); //rotate
                    g.TranslateTransform(s1.X, s1.Y, MatrixOrder.Append); //pan
                    g.DrawImage(s1.image, 0, 0); //draw
                }
            }
            g.Dispose();
            SetBackground(screenImage);
        }
    }
}