using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 using ThoughtWorks.QRCode.Codec;

 using System.Drawing;

 using System.Drawing.Imaging;

 using Game.Utils;

 using System.Drawing.Drawing2D;

 using Game.Facade;

 using System.Net;

 using System.IO;

 namespace Game.Web.WS

 {

     /// <summary>

     /// QRCode 的摘要说明

     /// </summary>

     public class QRCode : IHttpHandler

     {

         public void ProcessRequest(HttpContext context)

         {

             GetQRCode(context);

         }

         /// <summary>

         /// 绘制二维码

         /// </summary>

         /// <param name="context"></param>

         private void GetQRCode(HttpContext context)

         {

             string encodeData = GameRequest.GetQueryString("qt");

             string icoURL = GameRequest.GetQueryString("qm");

             int width = GameRequest.GetQueryInt("qs", );

             if (encodeData != string.Empty)

             {

                 calQrcode(encodeData, icoURL, width, context);

             }

         }

         /// <summary>

         /// 按照指定的大小绘制二维码

         /// </summary>

         /// <param name="sData"></param>

         /// <param name="width"></param>

         /// <returns></returns>

         private void calQrcode(string sData, string icoURL, int size, HttpContext context)

         {

             //二维码版本,大小获取

             Color qrCodeBackgroundColor = Color.White;

             Color qrCodeForegroundColor = Color.Black;

             int length = System.Text.Encoding.UTF8.GetBytes(sData).Length;

             //生成二维码数据

             QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();

             qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;

             qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//使用M纠错级别

             qrCodeEncoder.QRCodeVersion = ;

             var encodedData = qrCodeEncoder.Encode(sData, System.Text.Encoding.UTF8);

             //绘制图片

             int x = , y = ;

             int w = , h = ;

             // 二维码矩阵单边数据点数目

             int count = encodedData.Length;

             // 获取单个数据点边长

             double sideLength = Convert.ToDouble(size) / count;

             // 初始化背景色画笔

             SolidBrush backcolor = new SolidBrush(qrCodeBackgroundColor);

             // 初始化前景色画笔

             SolidBrush forecolor = new SolidBrush(qrCodeForegroundColor);

             // 定义画布

             Bitmap image = new Bitmap(size, size);

             // 获取GDI+绘图图画

             Graphics graph = Graphics.FromImage(image);

             // 先填充背景色

             graph.FillRectangle(backcolor, , , size, size);

             // 变量数据矩阵生成二维码

             for (int row = ; row < count; row++)

             {

                 for (int col = ; col < count; col++)

                 {

                     // 计算数据点矩阵起始坐标和宽高

                     x = Convert.ToInt32(Math.Round(col * sideLength));

                     y = Convert.ToInt32(Math.Round(row * sideLength));

                     w = Convert.ToInt32(Math.Ceiling((col + ) * sideLength) - Math.Floor(col * sideLength));

                     h = Convert.ToInt32(Math.Ceiling((row + ) * sideLength) - Math.Floor(row * sideLength));

                     // 绘制数据矩阵

                     graph.FillRectangle(encodedData[col][row] ? forecolor : backcolor, x, y, w, h);

                 }

             }

             //添加LOGO

             string path = context.Server.MapPath("/favicon.ico");

             Bitmap logoImage = null;

             FileInfo fileInfo = new FileInfo(path);

             if (fileInfo.Exists)

             {

                 logoImage = new Bitmap(path);

             }

             if (icoURL != "")

             {

                 HttpWebRequest webRequest = (HttpWebRequest)HttpWebRequest.Create(icoURL);

                 try

                 {

                     HttpWebResponse webReponse = (HttpWebResponse)webRequest.GetResponse();

                     if (webReponse.StatusCode == HttpStatusCode.OK)

                     {

                         using (Stream stream = webReponse.GetResponseStream())

                         {

                             Image img = Image.FromStream(stream);

                             logoImage = new Bitmap(img);

                             img.Dispose();

                         }

                     }

                 }

                 catch { }

             }

             if (logoImage != null)

             {

                 image = CoverImage(image, logoImage, graph);

                 logoImage.Dispose();

             }

             //输出

             System.IO.MemoryStream ms = new System.IO.MemoryStream();

             image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);

             context.Response.ClearContent();

             context.Response.ContentType = "image/png";

             context.Response.AddHeader("Content-Disposition", "attachment;  filename=" + HttpUtility.UrlEncode("QRCodeImg.png", System.Text.Encoding.UTF8));

             context.Response.BinaryWrite(ms.ToArray());

             context.Response.Flush();

             context.Response.End();

             image.Dispose();

         }

         /// <summary>

         /// 层叠图片

         /// </summary>

         /// <param name="original">原始图片(目前只支持正方形)</param>

         /// <param name="image">层叠图片(目前只支持正方形)</param>

         /// <returns>处理以后的图片</returns>

         private Bitmap CoverImage(Bitmap original, Bitmap image, Graphics graph = null)

         {

             //缩放附加图片

             int sideSLen = original.Width;

             int sideTLen = sideSLen / ;

             image = ResizeImage(image, sideTLen, sideTLen);

             // 获取GDI+绘图图画

             graph = graph == null ? Graphics.FromImage(original) : graph;

             // 将附加图片绘制到原始图*

             graph.DrawImage(image, (original.Width - sideTLen) / , (original.Height - sideTLen) / , sideTLen, sideTLen);

             // 释放GDI+绘图图画内存

             graph.Dispose();

             // 返回处理结果

             return original;

         }

         /// <summary>

         /// 图片缩放

         /// </summary>

         /// <param name="bmp">原始Bitmap</param>

         /// <param name="newW">新的宽度</param>

         /// <param name="newH">新的高度</param>

         /// <returns>处理以后的图片</returns>

         private Bitmap ResizeImage(Bitmap original, int width, int height)

         {

             try

             {

                 Bitmap image = new Bitmap(width, height);

                 Graphics graph = Graphics.FromImage(image);

                 // 插值算法的质量

                 graph.CompositingQuality = CompositingQuality.HighQuality;

                 graph.SmoothingMode = SmoothingMode.HighQuality;

                 graph.InterpolationMode = InterpolationMode.HighQualityBicubic;

                 graph.DrawImage(original, new Rectangle(, , width, height),

                     new Rectangle(, , original.Width, original.Height), GraphicsUnit.Pixel);

                 graph.Dispose();

                 return image;

             }

             catch

             {

                 return null;

             }

         }       

         public bool IsReusable

         {

             get

             {

                 return false;

             }

         }

     }

 }