1using System;
  2using System.Data;
  3using System.Configuration;
  4using System.Collections;
  5using System.Web;
  6using System.Web.Security;
  7using System.Web.UI;
  8using System.Web.UI.WebControls;
  9using System.Web.UI.WebControls.WebParts;
 10using System.Web.UI.HtmlControls;
 11using System.Drawing;
 12
 13namespace GustBook.WEB
 14...{
 15    public partial class VerifyCode : System.Web.UI.Page
 16    ...{
 17        protected void Page_Load(object sender, EventArgs e)
 18        ...{
 19
 20            VerifyCode v = new VerifyCode();
 21
 22            v.Length = this.length;
 23            v.FontSize = this.fontSize;
 24            v.Chaos = this.chaos;
 25            v.BackgroundColor = this.backgroundColor;
 26            v.ChaosColor = this.chaosColor;
 27            v.CodeSerial = this.codeSerial;
 28            v.Colors = this.colors;
 29            v.Fonts = this.fonts;
 30            v.Padding = this.padding;
 31            string code = v.CreateVerifyCode();                //取随机码
 32            v.CreateImageOnPage(code, this.Context);        // 输出图片
 33
 34            Response.Cookies.Add(new HttpCookie("CheckCode", code.ToUpper()));// 使用Cookies取验证码的值
 35
 36        }
 37
 38        验证码长度(默认6个验证码的长度)#region 验证码长度(默认6个验证码的长度)
 39        int length = 4;
 40        public int Length
 41        ...{
 42            get ...{ return length; }
 43            set ...{ length = value; }
 44        }
 45        #endregion
 46
 47        验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)#region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)
 48        int fontSize = 40;
 49        public int FontSize
 50        ...{
 51            get ...{ return fontSize; }
 52            set ...{ fontSize = value; }
 53        }
 54        #endregion
 55
 56        边框补(默认1像素)#region 边框补(默认1像素)
 57        int padding = 2;
 58        public int Padding
 59        ...{
 60            get ...{ return padding; }
 61            set ...{ padding = value; }
 62        }
 63        #endregion
 64
 65        是否输出燥点(默认不输出)#region 是否输出燥点(默认不输出)
 66        bool chaos = true;
 67        public bool Chaos
 68        ...{
 69            get ...{ return chaos; }
 70            set ...{ chaos = value; }
 71        }
 72        #endregion
 73
 74        输出燥点的颜色(默认灰色)#region 输出燥点的颜色(默认灰色)
 75        Color chaosColor = Color.LightGray;
 76        public Color ChaosColor
 77        ...{
 78            get ...{ return chaosColor; }
 79            set ...{ chaosColor = value; }
 80        }
 81        #endregion
 82
 83        自定义背景色(默认白色)#region 自定义背景色(默认白色)
 84        Color backgroundColor = Color.White;
 85        public Color BackgroundColor
 86        ...{
 87            get ...{ return backgroundColor; }
 88            set ...{ backgroundColor = value; }
 89        }
 90        #endregion
 91
 92        自定义随机颜色数组#region 自定义随机颜色数组
 93        Color[] colors = ...{ Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
 94        public Color[] Colors
 95        ...{
 96            get ...{ return colors; }
 97            set ...{ colors = value; }
 98        }
 99        #endregion
100
101        自定义字体数组#region 自定义字体数组
102        string[] fonts = ...{ "Arial", "Georgia" };
103        public string[] Fonts
104        ...{
105            get ...{ return fonts; }
106            set ...{ fonts = value; }
107        }
108        #endregion
109
110        自定义随机码字符串序列(使用逗号分隔)#region 自定义随机码字符串序列(使用逗号分隔)
111        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";
112        public string CodeSerial
113        ...{
114            get ...{ return codeSerial; }
115            set ...{ codeSerial = value; }
116        }
117        #endregion
118
119        产生波形滤镜效果#region 产生波形滤镜效果
120
121        private const double PI = 3.1415926535897932384626433832795;
122        private const double PI2 = 6.283185307179586476925286766559;
123
124        /**//// <summary>
125        /// 正弦曲线Wave扭曲图片（Edit By 51aspx.com）
126        /// </summary>
127        /// <param name="srcBmp">图片路径</param>
128        /// <param name="bXDir">如果扭曲则选择为True</param>
129        /// <param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高，一般为3</param>
130        /// <param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param>
131        /// <returns></returns>
132        public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
133        ...{
134            System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
135
136            // 将位图背景填充为白色
137            System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
138            graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
139            graph.Dispose();
140
141            double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
142
143            for (int i = 0; i < destBmp.Width; i++)
144            ...{
145                for (int j = 0; j < destBmp.Height; j++)
146                ...{
147                    double dx = 0;
148                    dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
149                    dx += dPhase;
150                    double dy = Math.Sin(dx);
151
152                    // 取得当前点的颜色
153                    int nOldX = 0, nOldY = 0;
154                    nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
155                    nOldY = bXDir ? j : j + (int)(dy * dMultValue);
156
157                    System.Drawing.Color color = srcBmp.GetPixel(i, j);
158                    if (nOldX >= 0 && nOldX < destBmp.Width
159                     && nOldY >= 0 && nOldY < destBmp.Height)
160                    ...{
161                        destBmp.SetPixel(nOldX, nOldY, color);
162                    }
163                }
164            }
165
166            return destBmp;
167        }
168
169
170
171        #endregion
172
173        生成校验码图片#region 生成校验码图片
174        public Bitmap CreateImageCode(string code)
175        ...{
176            int fSize = FontSize;
177            int fWidth = fSize + Padding;
178
179            int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
180            int imageHeight = fSize * 2 + Padding;
181
182            System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
183
184            Graphics g = Graphics.FromImage(image);
185
186            g.Clear(BackgroundColor);
187
188            Random rand = new Random();
189
190            //给背景添加随机生成的燥点
191            if (this.Chaos)
192            ...{
193
194                Pen pen = new Pen(ChaosColor, 0);
195                int c = Length * 10;
196
197                for (int i = 0; i < c; i++)
198                ...{
199                    int x = rand.Next(image.Width);
200                    int y = rand.Next(image.Height);
201
202                    g.DrawRectangle(pen, x, y, 1, 1);
203                }
204            }
205
206            int left = 0, top = 0, top1 = 1, top2 = 1;
207
208            int n1 = (imageHeight - FontSize - Padding * 2);
209            int n2 = n1 / 4;
210            top1 = n2;
211            top2 = n2 * 2;
212
213            Font f;
214            Brush b;
215
216            int cindex, findex;
217
218            //随机字体和颜色的验证码字符
219            for (int i = 0; i < code.Length; i++)
220            ...{
221                cindex = rand.Next(Colors.Length - 1);
222                findex = rand.Next(Fonts.Length - 1);
223
224                f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
225                b = new System.Drawing.SolidBrush(Colors[cindex]);
226
227                if (i % 2 == 1)
228                ...{
229                    top = top2;
230                }
231                else
232                ...{
233                    top = top1;
234                }
235
236                left = i * fWidth;
237
238                g.DrawString(code.Substring(i, 1), f, b, left, top);
239            }
240
241            //画一个边框 边框颜色为Color.Gainsboro
242            g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
243            g.Dispose();
244
245            //产生波形（Add By 51aspx.com）
246            image = TwistImage(image, true, 8, 4);
247
248            return image;
249        }
250        #endregion
251
252        将创建好的图片输出到页面#region 将创建好的图片输出到页面
253        public void CreateImageOnPage(string code, HttpContext context)
254