C#实现打造气泡屏幕保护效果

Random ra = new Random(); //初始化随机数    bmp = new Bitmap(ClientSize.Width,ClientSize.Height, e.Graphics);    Graphics bmpGraphics = Graphics.FromImage(bmp);    // 绘制圆形        for (int i=1;i<=13;i++)//这里绘制13个圆形    {      bmpGraphics.DrawEllipse(new Pen(Color.FromName(colours[i]),2),//根据事先定义好的颜色绘制不同颜色的圆       ballarray[i, 1], ballarray[i, 2], 70+ra.Next(1, 10), 70+ra.Next(1, 10));       //注意上面的最后两个参数利用随机数产生粘滞效果    }    e.Graphics.DrawImageUnscaled(bmp, 0, 0);    bmpGraphics.Dispose();    bmp.Dispose();//这里是非托管的垃圾回收机制,避免产生内存溢出

[DllImport("user32.dll")]//引用USER32.DLL public static extern UInt32 RegisterHotKey(IntPtr hWnd, UInt32 id, UInt32 fsModifiers, UInt32 vk); //声明函数原型

protected override void WndProc(ref Message m)//注意是保护类型的过程  {      const int WM_HOTKEY = 0x0312;  }     if (m.Msg == WM_HOTKEY & & m.WParam.ToInt32() == 247696411) //判断热键消息是不是我们设置的        {         Application.Exit();//如果消息等于我们的热键消息,程序退出       }     base.WndProc(ref m);//其他消息返回做默认处理

using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Runtime.InteropServices;/*  屏幕保护程序 使用技术：系统热键，随机数，Graphics类绘制圆形 编译环境：VisualStudio 2005 运行要求：安装.net framework 2.0 框架 其他：使用ESC退出  说明：由于使用了循环控制图形位移，CPU占用在20%-30%左右 程序具有自动垃圾回收机制避免造成内存溢出  2009年3月15日 */namespace AnimatBall{  /// <summary>  /// Summary description for Form1.  /// </summary>     public class Form1 : System.Windows.Forms.Form  {     public int[,] ballarray = new int[20,20];    public string[] colours = new string[16];      public Bitmap bmp;    private System.Windows.Forms.Timer timer1;    private System.ComponentModel.IContainer components;     [DllImport("user32.dll")]    public static extern UInt32 RegisterHotKey(IntPtr hWnd, UInt32 id, UInt32 fsModifiers, UInt32 vk); //API     //重写消息循环        protected override void WndProc(ref Message m)     {       const int WM_HOTKEY = 0x0312;             if (m.Msg == WM_HOTKEY && m.WParam.ToInt32() == 247696411) //判断热键       {         Application.Exit();       }       base.WndProc(ref m);     }    public Form1()    {      //      // Required for Windows Form Designer support      //      InitializeComponent();      //colours[0]="Red";      colours[1]="Red";      colours[2]="Blue";      colours[3]="Black";      colours[4]="Yellow";      colours[5]="Crimson";      colours[6]="Gold";      colours[7]="Green";      colours[8]="Magenta";      colours[9]="Aquamarine";      colours[10]="Brown";      colours[11]="Red";      colours[12]="DarkBlue";      colours[13]="Brown";      colours[14]="Red";      colours[15]="DarkBlue";      InitializeComponent();      RegisterHotKey(this.Handle, 247696411, 0, (UInt32)Keys.Escape); //注册热键      //      // TODO: Add any constructor code after InitializeComponent call      //    }     /// <summary>    /// Clean up any resources being used.    /// </summary>     protected override void Dispose( bool disposing )    {      if( disposing )      {        if (components != null)         {          components.Dispose();        }      }      base.Dispose( disposing );    }       #region Windows Form Designer generated code     /// <summary>    /// Required method for Designer support - do not modify    /// the contents of this method with the code editor.    /// </summary>     private void InitializeComponent()    {      this.components = new System.ComponentModel.Container();      this.timer1 = new System.Windows.Forms.Timer(this.components);      this.SuspendLayout();      //       // timer1      //       this.timer1.Interval = 25;      this.timer1.Tick += new System.EventHandler(this.timer1_Tick);      //       // Form1      //       this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);      this.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(192)))), ((int)(((byte)(192)))));      this.ClientSize = new System.Drawing.Size(373, 294);      this.DoubleBuffered = true;      this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;      this.Name = "Form1";      this.ShowInTaskbar = false;      this.Text = "小焱屏幕保护";      this.TopMost = true;      this.TransparencyKey = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(192)))), ((int)(((byte)(192)))));      this.WindowState = System.Windows.Forms.FormWindowState.Maximized;      this.Load += new System.EventHandler(this.Form1_Load);      this.ResumeLayout(false);    }      #endregion     /// <summary>    /// The main entry point for the application.    /// </summary>     [STAThread]    static void Main()     {      Application.Run(new Form1());    }     private void timer1_Tick(object sender, System.EventArgs e)    {            for (int i=1;i<=13;i++)      {           //add direction vectors to coordinates        ballarray[i,1] = ballarray[i,1] + ballarray[i,3];         ballarray[i,2] = ballarray[i,2] + ballarray[i,4];         //if ball goes of to right        if ((ballarray[i,1]+50)>=ClientSize.Width)        {                ballarray[i,1]=ballarray[i,1]-ballarray[i,3];          ballarray[i,3]=-ballarray[i,3];        }          //if ball goes off bottom        else if ((ballarray[i,2]+50)>=ClientSize.Height)        {          ballarray[i,2]=ballarray[i,2]-ballarray[i,4];          ballarray[i,4]=-ballarray[i,4];        }          //if ball goes off to left        else if (ballarray[i,1]<=1)        {          ballarray[i,1]=ballarray[i,1]-ballarray[i,3];          ballarray[i,3]=-ballarray[i,3];        }                   //if ball goes over top        else if (ballarray[i,2]<=1)        {          ballarray[i,2]=ballarray[i,2]-ballarray[i,4];          ballarray[i,4]=-ballarray[i,4];        }      }      this.Refresh(); //force repaint of window    }    //Called from timer event when window needs redrawing    protected override void OnPaint(PaintEventArgs e)    {      Random ra = new Random();       bmp = new Bitmap(ClientSize.Width,ClientSize.Height, e.Graphics);      Graphics bmpGraphics = Graphics.FromImage(bmp);      // draw here              for (int i=1;i<=13;i++)      {        bmpGraphics.DrawEllipse(new Pen(Color.FromName(colours[i]),2),          ballarray[i, 1], ballarray[i, 2], 70+ra.Next(1, 10), 70+ra.Next(1, 10));//利用随机数产生粘滞效果      }      e.Graphics.DrawImageUnscaled(bmp, 0, 0);      //Draw ellipse acording to mouse coords.            bmpGraphics.Dispose();      bmp.Dispose();    }          private void Form1_Load(object sender, EventArgs e)    {      Random r = new Random();      //set ball coords and vectors x,y,xv,yv      for (int i = 1; i <= 13; i++)      {        ballarray[i, 1] = +r.Next(10) + 1; //+1 means i lose zero values        ballarray[i, 2] = +r.Next(10) + 1;        ballarray[i, 3] = +r.Next(10) + 1;        ballarray[i, 4] = +r.Next(10) + 1;      }      timer1.Start();    }     }}