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
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/// <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
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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 } |
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原文链接：http://www.cnblogs.com/xiangzhong/p/5373822.html
