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c#桌面飘雪小程序，之前在网上查到过代码，但有很多错误，并且在win7下无法运行。
将其改成c#代码，并测试，效果如上图，可兼容XP和win7系统均可运行。 其主要代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Runtime.InteropServices;
namespace WindowsXueJi04
{
public partial class Form1 : Form
{
[DllImport("gdi32.dll")]
static extern int SetPixel(IntPtr hSdc, int x, int y, int crColor);
[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
public static extern IntPtr CreateDC(string lpszDriver, string lpszDevice, string lpszOutput, int lpInitData);
[DllImport("gdi32.dll")]
public static extern int DeleteDC(IntPtr hdc);
static int SnowNumber = 600;
public SnowNode[] SnowNodes = new SnowNode[SnowNumber];
int CrWind = 0;
int ScreenWidth; //屏幕宽度
int ScreenHeight;
Bitmap Bmp;
Color SnowD;
Color SnowS;
Color Snowc;
public Form1()
{
InitializeComponent();
ScreenWidth = Screen.PrimaryScreen.Bounds.Width;
ScreenHeight = Screen.PrimaryScreen.Bounds.Height;
SnowD = ColorTranslator.FromWin32(0xFFFFFF);
SnowS = ColorTranslator.FromWin32(0xFFDDDD);
Snowc = ColorTranslator.FromWin32(0xFEFfFE);
Bmp = new Bitmap(ScreenWidth, ScreenHeight);
this.timer1.Interval = 1200;
this.timer2.Interval = 2;
this.timer1.Enabled = true;
InitSnowNodes();
this.timer2.Enabled = true;
}
public void InitSnowNodes()//初始化雪点
{
Graphics G = Graphics.FromImage(Bmp);
G.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(ScreenWidth, ScreenHeight));
G.Dispose();//释放资源
Random rand = new Random();
for (int i = 0; i < SnowNumber; i++)
{
SnowNodes[i] = new SnowNode(rand.Next(ScreenWidth), rand.Next(ScreenHeight));
SnowNodes[i].iColor = Bmp.GetPixel(SnowNodes[i].postion.X, SnowNodes[i].postion.Y);
}
IntPtr Ptr = CreateDC("DISPLAY", null, null, 0);
for (int j = 0; j < SnowNumber; j++)
{
SetPixel(Ptr, SnowNodes[j].postion.X, SnowNodes[j].postion.Y, 0xFEFfFE);
}
DeleteDC(Ptr);
Graphics G1 = Graphics.FromImage(Bmp);//复制桌面到BMP
G1.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(ScreenWidth, ScreenHeight));
G1.Dispose();
}
void MoveSnowNodes()
{
IntPtr Ptr = CreateDC("DISPLAY", null, null, 0);
Random rand = new Random();
for (int i = 0; i < SnowNumber; i++)//
{
SetPixel(Ptr, SnowNodes[i].postion.X, SnowNodes[i].postion.Y, ColorTranslator.ToWin32(SnowNodes[i].iColor));
int dx = rand.Next(3) - 1 + CrWind*2;
int dy = 4;
SnowNodes[i].postion.X += dx;
SnowNodes[i].postion.Y += dy;
if ((SnowNodes[i].postion.X < 2)||(SnowNodes[i].postion.X > (ScreenWidth-2))
||(SnowNodes[i].postion.Y > (ScreenHeight-2)))
{
SnowNodes[i].postion.X = rand.Next(ScreenWidth-2)+1;
SnowNodes[i].postion.Y = rand.Next(3);
SnowNodes[i].iColor = Bmp.GetPixel(SnowNodes[i].postion.X, SnowNodes[i].postion.Y);
SetPixel(Ptr, SnowNodes[i].postion.X, SnowNodes[i].postion.Y, 0xFEFfFE);
continue;
}
Color col = Bmp.GetPixel(SnowNodes[i].postion.X, SnowNodes[i].postion.Y);
if (col.Equals(Snowc))//
{
SnowNodes[i].postion.X = rand.Next(ScreenWidth - 2) + 1;
SnowNodes[i].postion.Y = rand.Next(3);
SnowNodes[i].iColor = Bmp.GetPixel(SnowNodes[i].postion.X, SnowNodes[i].postion.Y);
SetPixel(Ptr, SnowNodes[i].postion.X, SnowNodes[i].postion.Y, 0xFEFfFE);
continue;
}
if ((col.Equals(SnowS)) || (GetContrast(col, dx, i) > 30))//判断对比度
{
SetPixel(Ptr, SnowNodes[i].postion.X, SnowNodes[i].postion.Y - 1, 0xFFFFFF);
SetPixel(Ptr, SnowNodes[i].postion.X - 1, SnowNodes[i].postion.Y, 0xFFDDDD);
SetPixel(Ptr, SnowNodes[i].postion.X + 1, SnowNodes[i].postion.Y, 0xFFDDDD);
SnowNodes[i].postion.X = rand.Next(ScreenWidth - 2) + 1;
SnowNodes[i].postion.Y = rand.Next(3);
SnowNodes[i].iColor = Bmp.GetPixel(SnowNodes[i].postion.X, SnowNodes[i].postion.Y);
SetPixel(Ptr, SnowNodes[i].postion.X, SnowNodes[i].postion.Y, 0xFEFfFE);
continue;
}
SnowNodes[i].iColor = col;
SetPixel(Ptr, SnowNodes[i].postion.X, SnowNodes[i].postion.Y, 0xFEFfFE);
}
DeleteDC(Ptr);
Graphics G = Graphics.FromImage(Bmp);
G.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(ScreenWidth, ScreenHeight));//
G.Dispose();
}
private void timer1_Tick(object sender, EventArgs e)
{
Random rand = new Random();
CrWind = rand.Next(4)- 2;
}
private void timer2_Tick(object sender, EventArgs e)
{
this.timer2.Enabled = false;
MoveSnowNodes();
this.timer2.Interval = 2;
this.timer2.Enabled = true;
}
}
}
完成项目资源，请到下地址下载：
http://download.csdn.net/detail/sky_blue22/8577315
c#桌面飘雪小程序，兼容win7
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