C# QR Code 二维码操作/带logo

<img src="@Url.Action("ShowQRCode","SafetyEquipment", new { id = Model.Id, codeNum = Model.Number })" style="padding-top:20px;" />
         public ActionResult ShowQRCode(Guid id, string codeNum)
        {
            MemoryStream sm = CreateCode(id, codeNum);
            byte[] bytes = new byte[sm.Length];
            sm.Seek(0, SeekOrigin.Begin);
            sm.Read(bytes, 0, Convert.ToInt32(sm.Length));            return File(bytes, @"image/png");
        }
        public MemoryStream CreateCode(Guid id, string codeNum)
        {
            //moa链接地址
            string moaPath = AppSetting.GetString(Constant.APPSET_EQUIPMENT_QRCODE_MOAURL);
            //logo和扫描图标地址
            string logoPath = Server.MapPath("~/Content/PersonalCenter/img/中国移动.png");
            string smPath = Server.MapPath("~/Content/PersonalCenter/img/scanning.gif");            //生成二维码
            var service = this.GetService<ISafetyEquipmentService>();            return service.CreateCode(codeNum, moaPath + "?id=" + id, logoPath, smPath);
        }
        /// <summary>
        /// 单个二维码
        /// </summary>
        /// <param name="number">设备编码</param>
        /// <param name="moaPath">moa链接</param>
        /// <param name="logoPath">logo图标地址</param>
        /// <param name="smPath">扫描图标地址</param>
        /// <returns></returns>
        public MemoryStream CreateCode(string number, string moaPath, string logoPath, string smPath)
        {
            //生成二维码
            var stream = QRCodeHelp.CreateQRCode(moaPath, number.PadLeft(8, '0'), logoPath, smPath);            return stream;
        }
        public static MemoryStream CreateQRCode(string alink, string number, string logoPath, string smPath)
        {
            QRCodeGenerator qrGenerator = new QRCoder.QRCodeGenerator();
            Bitmap logoImg = new Bitmap(logoPath);
            Bitmap smImg = new Bitmap(smPath);            return CreateQRCodeStream(alink, number, qrGenerator, logoImg, smImg);
        }
        /// <summary>
        /// 二维码合成图片
        /// </summary>
        /// <param name="alink">文本/链接</param>
        /// <param name="number">编号</param>
        /// <param name="QRCodeGenerator">qr类</param>
        /// <param name="logoImg">logo</param>
        /// <param name="smImg">扫描图标</param>
        /// <returns>字节</returns>
        public static MemoryStream CreateQRCodeStream(string alink, string number, QRCodeGenerator qrGenerator, Bitmap logoImg, Bitmap smImg)
        {
            //qrcode
            QRCode qrcode = new QRCode(qrGenerator.CreateQrCode(alink, QRCodeGenerator.ECCLevel.Q));            //qrBitmap
            Bitmap qrImg = qrcode.GetGraphic(3, Color.Black, Color.White, null, 15, 6, false);            //将logo合并在二维码中
            Bitmap resultImg = QRCodeHelp.MergeQrImg(qrImg, logoImg, smImg, number);            MemoryStream stream = new MemoryStream();            resultImg.Save(stream, ImageFormat.Png);            stream.Flush();
            stream.Position = 0;            return stream;
        }
        #region 图形处理        /// <summary>
        /// 合并用户QR图片和用户头像
        /// </summary>
        /// <param name="qrImg">QR图片</param>
        /// <param name="logoImg">用户头像</param>
        /// <param name="sm">扫描logo</param>
        /// <param name="number">编码</param>
        /// <returns></returns>
        public static Bitmap MergeQrImg(Bitmap qrImg, Bitmap logoImg, Bitmap smImg, string number, double n = 0.23)
        {
            //logo外边距
            int margin = 5;
            float dpix = qrImg.HorizontalResolution;
            float dpiy = qrImg.VerticalResolution;            //logo缩放比例
            var _newWidth = (7 * qrImg.Width - 36 * margin) * 1.0f / 36;
            var _headerImg = QRCodeHelp.ZoomPic(logoImg, _newWidth / logoImg.Width);
            //处理头像
            int newImgWidth = _headerImg.Width + margin;
            Bitmap headerBgImg = new Bitmap(newImgWidth, newImgWidth);
            headerBgImg.MakeTransparent();
            Graphics g = Graphics.FromImage(headerBgImg);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            g.Clear(Color.Transparent);
            Pen p = new Pen(new SolidBrush(Color.White));
            Rectangle rect = new Rectangle(0, 0, newImgWidth - 1, newImgWidth - 1);
            using (GraphicsPath path = QRCodeHelp.CreateRoundedRectanglePath(rect, 1))
            {
                g.DrawPath(p, path);
                g.FillPath(new SolidBrush(Color.White), path);
            }
            //画头像
            Bitmap img1 = new Bitmap(_headerImg.Width, _headerImg.Width);
            Graphics g1 = Graphics.FromImage(img1);
            g1.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            g1.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            g1.Clear(Color.Transparent);
            Pen p1 = new Pen(new SolidBrush(Color.Gray));
            Rectangle rect1 = new Rectangle(0, 0, _headerImg.Width - 1, _headerImg.Width - 1);
            using (GraphicsPath path1 = QRCodeHelp.CreateRoundedRectanglePath(rect1, 1))
            {
                g1.DrawPath(p1, path1);
                TextureBrush brush = new TextureBrush(_headerImg);
                g1.FillPath(brush, path1);
            }
            g1.Dispose();
            PointF center = new PointF((newImgWidth - _headerImg.Width) / 2, (newImgWidth - _headerImg.Height) / 2);
            g.DrawImage(img1, center.X, center.Y, _headerImg.Width, _headerImg.Height);
            g.Dispose();            //背景图整体高度60
            Bitmap backgroudImg = new Bitmap(185, 235);
            backgroudImg.MakeTransparent();
            backgroudImg.SetResolution(dpix, dpiy);
            headerBgImg.SetResolution(dpix, dpiy);
            Graphics g2 = Graphics.FromImage(backgroudImg);
            g2.Clear(Color.White);
            //背景图上部高度+25
            g2.DrawImage(qrImg, 7, 25);
            //logo下移+25
            PointF center2 = new PointF((qrImg.Width - headerBgImg.Width) / 2 + 7, (qrImg.Height - headerBgImg.Height) / 2 + 25);
            g2.DrawImage(headerBgImg, center2);
            g2.Dispose();            Graphics g3 = Graphics.FromImage(backgroudImg);
            Font font = new Font("宋体", 13, FontStyle.Regular);
            SolidBrush sbrush = new SolidBrush(Color.DarkGray);
            //编码位置
            g3.DrawString(number, font, sbrush, new PointF(52, 2));
            //提示语位置
            g3.DrawString("请使用MOA端扫描", font, sbrush, new PointF(32, 205));
            //扫描图标
            g3.DrawImage(smImg, 20, 206);            return backgroudImg;
        }        /// <summary>
        /// 创建圆角矩形
        /// </summary>
        /// <param name="rect">区域</param>
        /// <param name="cornerRadius">圆角角度</param>
        /// <returns></returns>
        private static GraphicsPath CreateRoundedRectanglePath(Rectangle rect, int cornerRadius)
        {
            //下午重新整理下，圆角矩形
            GraphicsPath roundedRect = new GraphicsPath();
            roundedRect.AddArc(rect.X, rect.Y, cornerRadius * 2, cornerRadius * 2, 180, 90);
            roundedRect.AddLine(rect.X + cornerRadius, rect.Y, rect.Right - cornerRadius * 2, rect.Y);
            roundedRect.AddArc(rect.X + rect.Width - cornerRadius * 2, rect.Y, cornerRadius * 2, cornerRadius * 2, 270, 90);
            roundedRect.AddLine(rect.Right, rect.Y + cornerRadius * 2, rect.Right, rect.Y + rect.Height - cornerRadius * 2);
            roundedRect.AddArc(rect.X + rect.Width - cornerRadius * 2, rect.Y + rect.Height - cornerRadius * 2, cornerRadius * 2, cornerRadius * 2, 0, 90);
            roundedRect.AddLine(rect.Right - cornerRadius * 2, rect.Bottom, rect.X + cornerRadius * 2, rect.Bottom);
            roundedRect.AddArc(rect.X, rect.Bottom - cornerRadius * 2, cornerRadius * 2, cornerRadius * 2, 90, 90);
            roundedRect.AddLine(rect.X, rect.Bottom - cornerRadius * 2, rect.X, rect.Y + cornerRadius * 2);
            roundedRect.CloseFigure();
            return roundedRect;
        }        /// <summary>
        /// 图片按比例缩放
        /// </summary>
        private static Image ZoomPic(Image initImage, double n)
        {
            //缩略图宽、高计算
            double newWidth = initImage.Width;
            double newHeight = initImage.Height + 100;
            newWidth = n * initImage.Width;
            newHeight = n * initImage.Height;
            //生成新图
            //新建一个bmp图片
            System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWidth, (int)newHeight);
            //新建一个画板
            System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage);
            //设置质量
            newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //置背景色
            newG.Clear(Color.Transparent);
            //画图
            newG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);            newG.Dispose();
            return newImage;
        }        #endregion