汉字转换成图片(散分)

Question

本帖最后由 xuwei296 于 2010-08-10 16:17:39 编辑

Answer 1

Bitmap image = new Bitmap((int)Math.Ceiling((checkCode.Length * 8.5)), 22);
        Graphics g = Graphics.FromImage(image);
        try
        {
            //生成随机生成器
            Random random = new Random();
            //清空图片背景色
            g.Clear(Color.White);
            //Font font = new System.Drawing.Font("宋体", 10, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
            //System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Black, Color.Black,90, true);
            //g.DrawString(checkCode, font, brush, 2, 2);            g.FillRectangle(new System.Drawing.SolidBrush(Color.Black), 0, 0, image.Width, 20);
            g.Clear(Color.White);
            g.DrawString(checkCode, new Font("宋体", 10, FontStyle.Bold), Brushes.Black, new PointF(5, 5));
            MemoryStream ms = new MemoryStream();
            image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            Response.ClearContent();
            Response.ContentType = "image/Gif";
            Response.BinaryWrite(ms.ToArray());
        }
        finally
        {
            g.Dispose();
            image.Dispose();
        }

Answer 2

#region 生成汉字随机数
        /// <summary>
        /// 生成汉字随机数
        /// </summary>
        /// <param name="rd">随机数对象</param>
        /// <param name="intLength">随机数的个数</param>
        /// <returns></returns>
        public static string setRegionCodeRand(Random rd, int intLength)
        {
            string strRegCodeRand = "";
            Encoding encGB = Encoding.GetEncoding("gb2312");
            string[] strBase = new string[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
            object[] objBytes = new object[intLength];
            for (int i = 0; i < intLength; i++)
            {
                int rnd1 = rd.Next(11, 14);
                string str_rnd1 = strBase[rnd1].Trim();
                rd = new Random(rnd1 * unchecked((int)DateTime.Now.Ticks) + i);
                int rnd2;
                if (rnd1 == 13)
                {
                    rnd2 = rd.Next(0, 7);
                }
                else
                {
                    rnd2 = rd.Next(0, 16);
                }
                string str_rnd2 = strBase[rnd2].Trim();
                rd = new Random(rnd2 * unchecked((int)DateTime.Now.Ticks) + i);
                int rnd3 = rd.Next(10, 16);
                string str_rnd3 = strBase[rnd3].Trim();
                rd = new Random(rnd3 * unchecked((int)DateTime.Now.Ticks) + i);
                int rnd4;
                if (rnd3 == 10)
                {
                    rnd4 = rd.Next(1, 16);
                }
                else if (rnd3 == 15)
                {
                    rnd4 = rd.Next(0, 15);
                }
                else
                {
                    rnd4 = rd.Next(0, 16);
                }
                string str_rnd4 = strBase[rnd4].Trim();
                byte byRand1 = Convert.ToByte(str_rnd1 + str_rnd2, 16);
                byte byRand2 = Convert.ToByte(str_rnd3 + str_rnd4, 16);
                byte[] byRands = new byte[] { byRand1, byRand2 };
                objBytes.SetValue(byRands, i);
            }
            string[] strRegCode = new string[intLength];
            for (int j = 0; j < intLength; j++)
            {
                strRegCode[j] = encGB.GetString((byte[])Convert.ChangeType(objBytes[j], typeof(byte[])));
                strRegCodeRand += strRegCode[j].Trim();
            }
            return strRegCodeRand;
        }
        #endregionpublic static void strRandMap(string saveImagePath)
        {
            //建立位图对象
            Bitmap bitmap = new Bitmap(90, 30, PixelFormat.Format48bppRgb);
            //根据上面创建的位图对象创建绘图面
            Graphics graphics = Graphics.FromImage(bitmap);
            //以指定的颜色填充矩形区
            graphics.FillRectangle(new SolidBrush(Color.Red), new Rectangle(0, 0, 90, 30));
            //创建字体对象
            Font txtFont = new Font("gb2312", 12, FontStyle.Bold);
            //创建RectangleF结构指定一个区域
            RectangleF rectangleF = new RectangleF(0, 0, 90, 30);
            //创建随机数对象
            Random random = new Random();
            //获取随机数
            string strRand = setRegionCodeRand(random, 6);
            //string strRand = setRegionCodeRand(random, 4);
            //使用指定的颜色填充上面RectangleF结构指定的矩形区域
            graphics.FillRectangle(new SolidBrush(Color.BurlyWood), rectangleF);
            StringFormat sformat = new StringFormat();
            sformat.Alignment = StringAlignment.Center;
            sformat.LineAlignment = StringAlignment.Center;
            //在上面填充的矩形区域中填充上面生成的随机数
            graphics.DrawString(strRand, txtFont, new SolidBrush(Color.Blue), rectangleF, sformat);            //把创建的位图保存到指定的路径
            bitmap.Save(HttpContext.Current.Server.MapPath("") + saveImagePath, ImageFormat.Gif);
        }