验证码 生成变形的文字

using  System;
using  System.IO;
using  System.Web;
using  System.Web.UI;
using  System.Drawing;
using  System.Drawing.Drawing2D;
using  System.Drawing.Imaging;
namespace  Mis.Pages
{
    public class think_test:System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.TextBox TextBox1;
        protected System.Web.UI.WebControls.Button Button1;
        private Random rand = new Random();
        protected override void OnInit(EventArgs e)
        {    
            base.OnInit(e);
            this.Load += new System.EventHandler(this.Page_Load);
        }
        
        private void Page_Load(object sender, System.EventArgs e)
        {
            string checkCode = CreateRandomCode(8);
            Session["CheckCode"] = checkCode;
            CreateImage(checkCode);
        }

        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
        
        
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {    
            this.Button1.Click += new System.EventHandler(this.Button1_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        
        private string CreateRandomCode(int codeCount)
        {
            string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z" ;
            string[] allCharArray = allChar.Split(',');
            string randomCode = "";
            int temp = -1;
            for(int i = 0; i < codeCount; i++)
            {
                if(temp != -1)
                {
                    rand = new Random(i*temp*((int)DateTime.Now.Ticks));
                }
                int t = rand.Next(35);
                if(temp == t)
                {
                    return CreateRandomCode(codeCount);
                }
                temp = t;
                randomCode += allCharArray[t];
            }
            return randomCode;
        }
        
        private void TransformG(Graphics g)
        {
            Matrix myMatrix = new Matrix();
            int num1=rand.Next(80,900);
            int num2=rand.Next(80,800);
            float dd1=(float)num1;
            float dd2=(float)num2;
            dd1=dd1/10000;
            dd2=dd2/10000;
            float f1 = (float)(dd1);
            float f2 = (float)(dd2);
            myMatrix.Shear(f1,f2);
            g.MultiplyTransform(myMatrix);
        }
        
        private void CreateImage(string checkCode)
        {
            int iwidth = (int)(checkCode.Length * 11.5);
            System.Drawing.Bitmap image = new System.Drawing.Bitmap(150, 46);
            Graphics g = Graphics.FromImage(image);
            g.SmoothingMode=SmoothingMode.HighQuality;
            Font f = new System.Drawing.Font("Arial", 18, System.Drawing.FontStyle.Regular);
            Brush b = new System.Drawing.SolidBrush(Color.LightSlateGray);
            Rectangle rect = new Rectangle(0, 0, 150, 46);
            HatchBrush hatchBrush = new HatchBrush(
                HatchStyle.SmallConfetti,
                Color.LightGray,
                Color.White);
            g.FillRectangle(hatchBrush, rect);
            Point[] myArray ={
                                 new Point(rand.Next(150),rand.Next(46)),
                                 new Point(rand.Next(150),rand.Next(46)),
                                 new Point(rand.Next(150),rand.Next(46)),
                                 new Point(rand.Next(150),rand.Next(46)),
                                 new Point(rand.Next(150),rand.Next(46)),
                                 new Point(rand.Next(150),rand.Next(46)),
                                 new Point(rand.Next(150),rand.Next(46)),
                                 new Point(rand.Next(150),rand.Next(46)),
                                 new Point(rand.Next(150),rand.Next(46)),
                                 new Point(rand.Next(150),rand.Next(46))
                             };
            Pen myPen = new Pen(Color.Blue,1);

            GraphicsPath myPath = new GraphicsPath();
            myPath.AddBeziers(myArray);
            g.DrawPath(myPen, myPath);

            SizeF size;
            float CPostion=1;
            for(int i=0;i<checkCode.Length;i++)
            {
                TransformG(g);
                size = g.MeasureString(checkCode[i].ToString(), f);
                g.DrawString(checkCode[i].ToString(), f, b, CPostion, 7);
                CPostion+=size.Width-1;
                g.ResetTransform();
            }

            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            image.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);
            g.Dispose();
            image.Dispose();
            Response.ClearContent();
            Response.ContentType = "image/Jpeg";
            Response.BinaryWrite(ms.ToArray());
        }

        private void Button1_Click(object sender, System.EventArgs e)
        {
        
        }
    }    
}