namespace Google.Controllers

{ public class GoogleCaptchaController : Controller { #region 生成校驗碼圖片 public FileContentResult CreateImageCode() { string code = CreateVerifyCode(4); Session["GoogleCode"] = code.ToUpper(); int fSize = FontSize; int fWidth = fSize + Padding; int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2; int imageHeight = fSize * 2 + Padding; System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight); Graphics g = Graphics.FromImage(image); g.Clear(BackgroundColor); Random rand = new Random(); //給背景添加隨機生成的燥點 if (this.Chaos) { Pen pen = new Pen(ChaosColor, 0); int c = Length * 10; for (int i = 0; i < c; i++) { int x = rand.Next(image.Width); int y = rand.Next(image.Height); g.DrawRectangle(pen, x, y, 1, 1); } } int left = 0, top = 0, top1 = 1, top2 = 1; int n1 = (imageHeight - FontSize - Padding * 2); int n2 = n1 / 4; top1 = n2; top2 = n2 * 2; Font f; Brush b; int cindex, findex; //隨機字體和顏色的驗證碼字符 for (int i = 0; i < code.Length; i++) { cindex = rand.Next(Colors.Length - 1); findex = rand.Next(Fonts.Length - 1); f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold); b = new System.Drawing.SolidBrush(Colors[cindex]); if (i % 2 == 1) { top = top2; } else { top = top1; } left = i * fWidth; g.DrawString(code.Substring(i, 1), f, b, left, top); } //畫一個邊框 邊框顏色為Color.Gainsboro g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1); g.Dispose(); //產(chǎn)生波形 image = TwistImage(image, true, 3, 6); System.IO.MemoryStream ms = new System.IO.MemoryStream(); //將圖像保存到指定的流 image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); return File(ms.GetBuffer(), "image/JPEG"); } #endregion #region 屬性 #region 驗證碼長度 int length = 4; public int Length { get { return length; } set { length = value; } } #endregion #region 驗證碼字體大小(為了顯示扭曲效果，默認(rèn)40像素，可以自行修改) int fontSize = 25; public int FontSize { get { return fontSize; } set { fontSize = value; } } #endregion #region 邊框補(默認(rèn)1像素) int padding = 2; public int Padding { get { return padding; } set { padding = value; } } #endregion #region 是否輸出燥點(默認(rèn)不輸出) bool chaos = false; public bool Chaos { get { return chaos; } set { chaos = value; } } #endregion #region 輸出燥點的顏色(默認(rèn)灰色) Color chaosColor = Color.LightGray; public Color ChaosColor { get { return chaosColor; } set { chaosColor = value; } } #endregion #region 自定義背景色(默認(rèn)白色) Color backgroundColor = Color.Gainsboro; public Color BackgroundColor { get { return backgroundColor; } set { backgroundColor = value; } } #endregion #region 自定義隨機顏色數(shù)組 Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple }; public Color[] Colors { get { return colors; } set { colors = value; } } #endregion #region 自定義字體數(shù)組 string[] fonts = { "Arial", "Georgia" }; public string[] Fonts { get { return fonts; } set { fonts = value; } } #endregion #region 自定義隨機碼字符串序列(使用逗號分隔) string codeSerial = "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,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z"; public string CodeSerial { get { return codeSerial; } set { codeSerial = value; } } #endregion #endregion #region 產(chǎn)生波形濾鏡效果 private const double PI = 3.1415926535897932384626433832795; private const double PI2 = 6.283185307179586476925286766559; /// <summary> /// 正弦曲線Wave扭曲圖片（Edit By 51aspx.com） /// </summary> /// <param name="srcBmp">圖片路徑</param> /// <param name="bXDir">如果扭曲則選擇為True</param> /// <param name="nMultValue">波形的幅度倍數(shù)，越大扭曲的程度越高，一般為3</param> /// <param name="dPhase">波形的起始相位，取值區(qū)間[0-2*PI)</param> /// <returns></returns> public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase) { System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height); // 將位圖背景填充為白色 System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp); graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height); graph.Dispose(); double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width; for (int i = 0; i < destBmp.Width; i++) { for (int j = 0; j < destBmp.Height; j++) { double dx = 0; dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen; dx += dPhase; double dy = Math.Sin(dx); // 取得當(dāng)前點的顏色 int nOldX = 0, nOldY = 0; nOldX = bXDir ? i + (int)(dy * dMultValue) : i; nOldY = bXDir ? j : j + (int)(dy * dMultValue); System.Drawing.Color color = srcBmp.GetPixel(i, j); if (nOldX >= 0 && nOldX < destBmp.Width && nOldY >= 0 && nOldY < destBmp.Height) { destBmp.SetPixel(nOldX, nOldY, color); } } } return destBmp; } #endregion #region 生成隨機字符碼 public string CreateVerifyCode(int codeLen) { if (codeLen == 0) { codeLen = Length; } string[] arr = CodeSerial.Split(','); string code = ""; int randValue = -1; Random rand = new Random(unchecked((int)DateTime.Now.Ticks)); for (int i = 0; i < codeLen; i++) { randValue = rand.Next(0, arr.Length - 1); code += arr[randValue]; } return code; } public string CreateVerifyCode() { return CreateVerifyCode(0); } #endregion } }


















本文轉(zhuǎn)自cnn23711151CTO博客，原文鏈接：http://blog.51cto.com/cnn237111/554126?，如需轉(zhuǎn)載請自行聯(lián)系原作者

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