C#生成带logo的二维码

///

 /// 生成带logo二维码

 ///

 publicclassQRCodeHelper

 {///

  /// 创建二维码

  ///

  ///

  ///

  ///

  publicstaticBitmap Create(stringcontent)

  {

   try

   {

    //var options = new QrCodeEncodingOptions

    //{

    // DisableECI = true,

    // CharacterSet = "UTF-8",

    // Width = size,

    // Height = size,

    // Margin = 0,

    // ErrorCorrection = ErrorCorrectionLevel.H

    //};

    //var writer = new BarcodeWriter();

    //writer.Format = BarcodeFormat.QR_CODE;

    //writer.Options = options;

    //var bmp = writer.Write(content);

    //return bmp;

    QRCodeEncoder qRCodeEncoder =newQRCodeEncoder();

    qRCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//设置二维码编码格式

    qRCodeEncoder.QRCodeScale = 4;//设置编码测量度   

    qRCodeEncoder.QRCodeVersion = 7;//设置编码版本

    qRCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//设置错误校验

    Bitmap image = qRCodeEncoder.Encode(content);

    returnimage;

   }

   catch(Exception ex)

   {

    returnnull;

   }

  }

  ///

  /// 获取本地图片

  ///

  ///

  ///

  privatestaticBitmap GetLocalLog(stringfileName)

  {

   Bitmap newBmp =newBitmap(fileName);

   //Bitmap bmp = new Bitmap(newBmp);

   returnnewBmp;

  }

  ///

  /// 生成带logo二维码

  ///

  ///

  publicstaticBitmap CreateQRCodeWithLogo(stringcontent,stringlogopath)

  {

   //生成二维码

   Bitmap qrcode = Create(content);

   //生成logo

   Bitmap logo = GetLocalLog(logopath);

   ImageUtility util =newImageUtility();

   Bitmap finalImage = util.MergeQrImg(qrcode, logo);

   returnfinalImage;

  }

 }

publicclassImageUtility

 {

  #region 合并用户QR图片和用户头像

  ///

  /// 合并用户QR图片和用户头像

  ///

  ///QR图片

  ///用户头像

  ///

  ///

  publicBitmap MergeQrImg(Bitmap qrImg, Bitmap headerImg,doublen = 0.23)

  {

   intmargin = 10;

   floatdpix = qrImg.HorizontalResolution;

   floatdpiy = qrImg.VerticalResolution;

   var _newWidth = (10 * qrImg.Width - 36 * margin) * 1.0f / 36;

   var _headerImg = ZoomPic(headerImg, _newWidth / headerImg.Width);

   //处理头像

   intnewImgWidth = _headerImg.Width + margin;

   Bitmap headerBgImg =newBitmap(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 =newPen(newSolidBrush(Color.White));

   Rectangle rect =newRectangle(0, 0, newImgWidth - 1, newImgWidth - 1);

   using(GraphicsPath path = CreateRoundedRectanglePath(rect, 1))

   {

    g.DrawPath(p, path);

    g.FillPath(newSolidBrush(Color.White), path);

   }

   //画头像

   Bitmap img1 =newBitmap(_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 =newPen(newSolidBrush(Color.Gray));

   Rectangle rect1 =newRectangle(0, 0, _headerImg.Width - 1, _headerImg.Width - 1);

   using(GraphicsPath path1 = CreateRoundedRectanglePath(rect1, 1))

   {

    g1.DrawPath(p1, path1);

    TextureBrush brush =newTextureBrush(_headerImg);

    g1.FillPath(brush, path1);

   }

   g1.Dispose();

   PointF center =newPointF((newImgWidth - _headerImg.Width) / 2, (newImgWidth - _headerImg.Height) / 2);

   g.DrawImage(img1, center.X, center.Y, _headerImg.Width, _headerImg.Height);

   g.Dispose();

   Bitmap backgroudImg =newBitmap(qrImg.Width, qrImg.Height);

   backgroudImg.MakeTransparent();

   backgroudImg.SetResolution(dpix, dpiy);

   headerBgImg.SetResolution(dpix, dpiy);

   Graphics g2 = Graphics.FromImage(backgroudImg);

   g2.Clear(Color.Transparent);

   g2.DrawImage(qrImg, 0, 0);

   PointF center2 =newPointF((qrImg.Width - headerBgImg.Width) / 2, (qrImg.Height - headerBgImg.Height) / 2);

   g2.DrawImage(headerBgImg, center2);

   g2.Dispose();

   returnbackgroudImg;

  }

  #endregion

  #region 图形处理

  ///

  /// 创建圆角矩形

  ///

  ///区域

  ///圆角角度

  ///

  privateGraphicsPath CreateRoundedRectanglePath(Rectangle rect,intcornerRadius)

  {

   //下午重新整理下，圆角矩形

   GraphicsPath roundedRect =newGraphicsPath();

   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();

   returnroundedRect;

  }

  ///

  /// 图片按比例缩放

  ///

  privateImage ZoomPic(Image initImage,doublen)

  {

   //缩略图宽、高计算

   doublenewWidth = initImage.Width;

   doublenewHeight = initImage.Height;

   newWidth = n * initImage.Width;

   newHeight = n * initImage.Height;

   //生成新图

   //新建一个bmp图片

   System.Drawing.Image newImage =newSystem.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,newSystem.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height),newSystem.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);

   newG.Dispose();

   returnnewImage;

  }

  ///

  /// 创建缩略图

  ///

  ///

  ///

  ///

  ///

  publicstaticBitmap GetThumbnail(Bitmap b,intdestHeight,intdestWidth)

  {

   System.Drawing.Image imgSource = b;

   System.Drawing.Imaging.ImageFormat thisFormat = imgSource.RawFormat;

   intsW = 0, sH = 0;

   // 按比例缩放

   intsWidth = imgSource.Width;

   intsHeight = imgSource.Height;

   if(sHeight > destHeight || sWidth > destWidth)

   {

    if((sWidth * destHeight) > (sHeight * destWidth))

    {

     sW = destWidth;

     sH = (destWidth * sHeight) / sWidth;

    }

    else

    {

     sH = destHeight;

     sW = (sWidth * destHeight) / sHeight;

    }

   }

   else

   {

    sW = sWidth;

    sH = sHeight;

   }

   Bitmap outBmp =newBitmap(destWidth, destHeight);

   Graphics g = Graphics.FromImage(outBmp);

   g.Clear(Color.Transparent);

   // 设置画布的描绘质量

   g.CompositingQuality = CompositingQuality.HighQuality;

   g.SmoothingMode = SmoothingMode.HighQuality;

   g.InterpolationMode = InterpolationMode.HighQualityBicubic;

   g.DrawImage(imgSource,newRectangle((destWidth - sW) / 2, (destHeight - sH) / 2, sW, sH), 0, 0, imgSource.Width, imgSource.Height, GraphicsUnit.Pixel);

   g.Dispose();

   // 以下代码为保存图片时，设置压缩质量

   EncoderParameters encoderParams =newEncoderParameters();

   long[] quality =newlong[1];

   quality[0] = 100;

   EncoderParameter encoderParam =newEncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);

   encoderParams.Param[0] = encoderParam;

   imgSource.Dispose();

   returnoutBmp;

  }

  #endregion

 }