原文:
C#生成带logo的二维码
带logo的二维码生成分为两步骤：首先根据输入的内容生成二维码图片，然后读取本地的logo图片，通过图片处理生成带logo的二维码。
生成的二维码效果如下：
下面直接贴出二维码生成类 QRCodeHelper.cs ,直接调用 CreateQRCodeWithLogo 方法，传入相应参数返回bitmap类型的数据，直接将返回的数据绑定到图片控件，如果是web可以先将图片保存到服务器指定地址在获取显示
/// <summary> /// 生成带logo二维码 /// </summary> public class QRCodeHelper {/// <summary> /// 创建二维码 /// </summary> /// <param name="content"></param> /// <param name="size"></param> /// <returns></returns> public static Bitmap Create(string content) { 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 = new QRCodeEncoder(); 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); return image; } catch (Exception ex) { return null; } } /// <summary> /// 获取本地图片 /// </summary> /// <param name="fileName"></param> /// <returns></returns> private static Bitmap GetLocalLog(string fileName) { Bitmap newBmp = new Bitmap(fileName); //Bitmap bmp = new Bitmap(newBmp); return newBmp; } /// <summary> /// 生成带logo二维码 /// </summary> /// <returns></returns> public static Bitmap CreateQRCodeWithLogo(string content, string logopath) { //生成二维码 Bitmap qrcode = Create(content); //生成logo Bitmap logo = GetLocalLog(logopath); ImageUtility util = new ImageUtility(); Bitmap finalImage = util.MergeQrImg(qrcode, logo); return finalImage; } }
下面是从网上找的图片处理类 ImageUtility.cs
public class ImageUtility { #region 合并用户QR图片和用户头像 /// <summary> /// 合并用户QR图片和用户头像 /// </summary> /// <param name="qrImg">QR图片</param> /// <param name="headerImg">用户头像</param> /// <param name="n"></param> /// <returns></returns> public Bitmap MergeQrImg(Bitmap qrImg, Bitmap headerImg, double n = 0.23) { int margin = 10; float dpix = qrImg.HorizontalResolution; float dpiy = qrImg.VerticalResolution; var _newWidth = (10 * qrImg.Width - 36 * margin) * 1.0f / 36; var _headerImg = ZoomPic(headerImg, _newWidth / headerImg.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 = 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 = 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(); Bitmap backgroudImg = new Bitmap(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 = new PointF((qrImg.Width - headerBgImg.Width) / 2, (qrImg.Height - headerBgImg.Height) / 2); g2.DrawImage(headerBgImg, center2); g2.Dispose(); return backgroudImg; } #endregion #region 图形处理 /// <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 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 Image ZoomPic(Image initImage, double n) { //缩略图宽、高计算 double newWidth = initImage.Width; double newHeight = 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 = 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; } /// <summary> /// 创建缩略图 /// </summary> /// <param name="b"></param> /// <param name="destHeight"></param> /// <param name="destWidth"></param> /// <returns></returns> public static Bitmap GetThumbnail(Bitmap b, int destHeight, int destWidth) { System.Drawing.Image imgSource = b; System.Drawing.Imaging.ImageFormat thisFormat = imgSource.RawFormat; int sW = 0, sH = 0; // 按比例缩放 int sWidth = imgSource.Width; int sHeight = 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 = new Bitmap(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, new Rectangle((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 = new EncoderParameters(); long[] quality = new long[1]; quality[0] = 100; EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality); encoderParams.Param[0] = encoderParam; imgSource.Dispose(); return outBmp; } #endregion }
