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

}