提取自Discuz NT 的验证码生成
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using System;
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using System.Data;
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using System.Configuration;
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using System.Collections;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Web.UI.HtmlControls;
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using System.IO;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Drawing.Imaging;
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using System.Drawing.Text;
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using System.Security.Cryptography;
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public partial class inc_VerifyCode : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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GenerateImage("2312", 155, 40, Color.White, 111111);
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}
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private static byte[] randb = new byte[4];
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private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();
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private static Font[] fonts = {
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new Font(new FontFamily("Times New Roman"), 20 + Next(4),System.Drawing.FontStyle.Bold),
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new Font(new FontFamily("Georgia"), 20 + Next(4),System.Drawing.FontStyle.Bold),
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new Font(new FontFamily("Arial"), 20 + Next(4),System.Drawing.FontStyle.Bold),
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new Font(new FontFamily("Comic Sans MS"), 20 + Next(4),System.Drawing.FontStyle.Bold)
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};
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/// <summary>
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/// 获得下一个随机数
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/// </summary>
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/// <param name="max">最大值</param>
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/// <returns></returns>
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private static int Next(int max)
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{
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rand.GetBytes(randb);
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int value = BitConverter.ToInt32(randb, 0);
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value = value % (max + 1);
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if (value < 0)
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value = -value;
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return value;
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}
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/// <summary>
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/// 获得下一个随机数
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/// </summary>
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/// <param name="min">最小值</param>
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/// <param name="max">最大值</param>
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/// <returns></returns>
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private static int Next(int min, int max)
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{
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int value = Next(max - min) + min;
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return value;
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}
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public void GenerateImage(string code, int width, int height, Color bgcolor, int textcolor)
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{
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Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
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Graphics g = Graphics.FromImage(bitmap);
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Rectangle rect = new Rectangle(0, 0, width, height);
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g.SmoothingMode = SmoothingMode.AntiAlias;
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g.Clear(bgcolor);
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//int emSize = Next(3) + 15;//(int)((width - 20) * 2 / text.Length);
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//FontFamily family = fonts[Next(fonts.Length - 1)];
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//Font font = new Font(family, emSize, FontStyle.Bold);
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//SizeF measured = new SizeF(0, 0);
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//SizeF workingSize = new SizeF(width, height);
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//while (emSize > 2 && (measured = g.MeasureString(code, font)).Width > workingSize.Width || measured.Height > workingSize.Height)
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//{
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// font.Dispose();
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// font = new Font(family, emSize -= 2);
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//}
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int fixedNumber = textcolor == 2 ? 60 : 0;
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SolidBrush drawBrush = new SolidBrush(Color.FromArgb(Next(100), Next(100), Next(100)));
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for (int x = 0; x < 3; x++)
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{
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Pen linePen = new Pen(Color.FromArgb(Next(150) + fixedNumber, Next(150) + fixedNumber, Next(150) + fixedNumber), 1);
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g.DrawLine(linePen, new PointF(0.0F + Next(20), 0.0F + Next(height)), new PointF(0.0F + Next(width), 0.0F + Next(height)));
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}
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Matrix m = new Matrix();
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for (int x = 0; x < code.Length; x++)
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{
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m.Reset();
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m.RotateAt(Next(30) - 15, new PointF(Convert.ToInt64(width * (0.10 * x)), Convert.ToInt64(height * 0.5)));
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g.Transform = m;
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drawBrush.Color = Color.FromArgb(Next(150) + fixedNumber + 20, Next(150) + fixedNumber + 20, Next(150) + fixedNumber + 20);
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PointF drawPoint = new PointF(0.0F + Next(4) + x * 20, 3.0F + Next(3));
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g.DrawString(Next(1) == 1 ? code[x].ToString() : code[x].ToString().ToUpper(), fonts[Next(fonts.Length - 1)], drawBrush, drawPoint);
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g.ResetTransform();
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}
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double distort = Next(5, 10) * (Next(10) == 1 ? 1 : -1);
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using (Bitmap copy = (Bitmap)bitmap.Clone())
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{
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for (int y = 0; y < height; y++)
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{
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for (int x = 0; x < width; x++)
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{
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int newX = (int)(x + (distort * Math.Sin(Math.PI * y / 84.5)));
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int newY = (int)(y + (distort * Math.Cos(Math.PI * x / 54.5)));
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if (newX < 0 || newX >= width)
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newX = 0;
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if (newY < 0 || newY >= height)
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newY = 0;
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bitmap.SetPixel(x, y, copy.GetPixel(newX, newY));
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}
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}
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}
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//g.DrawRectangle(new Pen(Color.Silver), 0, 0, bitmap.Width - 1, bitmap.Height - 1);
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drawBrush.Dispose();
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g.Dispose();
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System.IO.MemoryStream ms = new System.IO.MemoryStream();
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bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
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Response.ClearContent();
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Response.ContentType = "image/Gif";
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Response.BinaryWrite(ms.ToArray());
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}
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}
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