使用Graphics合成带二维码和头像的分享图(小程序分享、App分享)

适用于微信小程序分享图、app分享图

//分享的海报背景图片 使用本地图片文件 string path = Server.MapPath("/Content/images/backimg.jpg");Image imgSrc = Image.FromFile(path); //将文件加载成图片格式//二维码图片文件 使用远程图片文件 var qr_url="";Image qrCodeImage= ReduceImage(qr_url, 122, 122);//头像文件 使用远程图片文件 var headurl="";Image headImage= ReduceImage(headurl, 59, 59);//开始合成图片 声明画图工具using (Graphics g = Graphics.FromImage(imgSrc)) {  //画推广二维码 声明起始坐标点  //从x轴30像素处、y轴的40像素处开始画  int qr_x = 30,qr_y = 40;   //指定二维码在合成图上显示的坐标和区域大小  Rectangle destRect = new Rectangle(qr_x, qr_y, qrCodeImage.Width, qrCodeImage.Height);  //在destRect声明的区域内，开始绘制二维码  Rectangle srcRect = new Rectangle(0, 0, qrCodeImage.Width, qrCodeImage.Height);  //开始绘制 GraphicsUnit.Pixel 表示以像素为单位  g.DrawImage(qrCodeImage, destRect, srcRect, GraphicsUnit.Pixel);  //画头像 裁剪头像(圆形)  Image header = CutEllipse(titleImage, new Size(59, 59));   int w = header.Width, h = header.Height; //图片宽高  int x = 24, y = 982; //图片坐标   g.DrawImage(header,      new Rectangle(x, y, w, h),      new Rectangle(0, 0, w, h),      GraphicsUnit.Pixel);  //画昵称 思源黑体 CN 常规 字体大小18 粗体  Font font = new Font("Source Han Sans CN Regular", 18, FontStyle.Bold, GraphicsUnit.Pixel);  Color fontColor = (Color)new ColorConverter().ConvertFromString("#999999");  g.DrawString("张三", font, new SolidBrush(fontColor), 100, 990); //坐标点 x=100 y=990  //画其他文本 思源黑体 CN 常规  var othertext = "邀请您看直播";  g.DrawString(othertext, font, new SolidBrush(fontColor), 101, 1014); //坐标点 x=100 y=990  header.Dispose();  g.Dispose();}//获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiffint quality = 50; //图像质量 1 - 100的范围ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders();ImageCodecInfo ici = null;foreach (ImageCodecInfo i in icis){ if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif")  {  ici = i;  }}EncoderParameters ep = new EncoderParameters(1);ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);//将图片转换成二进制流MemoryStream ms = new MemoryStream();//读取字节流imgSrc.Save(ms, ici, ep);var buffer = ms.GetBuffer(); //图片流ms.Dispose();imgSrc.Dispose();qrCodeImage.Dispose();headImage.Dispose();ep.Dispose();

ReduceImage 方法可以缩放图片大小

 1   /// <summary> 2   /// 缩小/放大图片  3   /// </summary> 4   /// <param name="url">图片网络地址</param> 5   /// <param name="toWidth">缩小/放大宽度</param> 6   /// <param name="toHeight">缩小/放大高度</param> 7   /// <returns></returns> 8   private static Image ReduceImage(string url, int toWidth, int toHeight, string param = null) 9   {10    try11    {12     Stream responseStream = null;13     if (param != null) //post请求14     {15      var intResult = HttpHelper.HttpClientPost(url, param, out responseStream);16     }17     else18     {19      WebRequest request = WebRequest.Create(url);20      WebResponse response = request.GetResponse();21      responseStream = response.GetResponseStream();22     }23     if (responseStream == null)24     {25      return null;26     }27 28     Image originalImage = Image.FromStream(responseStream);29     if (toWidth <= 0 && toHeight <= 0) //返回原图30     {31      return originalImage;32     }33     else if (toWidth > 0 && toHeight > 0) ////给了宽*高 如果原始小，则返回原图34     {35      if (originalImage.Width < toWidth && originalImage.Height < toHeight)36       return originalImage;37     }38     else if (toWidth <= 0 && toHeight > 0) //给了高,根据高计算宽，得出正方形图片39     {40      if (originalImage.Height < toHeight)41       return originalImage;42      toWidth = originalImage.Width * toHeight / originalImage.Height;43     }44     else if (toHeight <= 0 && toWidth > 0) //给了宽,根据宽计算高，得出正方形图片45     {46      if (originalImage.Width < toWidth)47       return originalImage;48      toHeight = originalImage.Height * toWidth / originalImage.Width;49     }50     Image toBitmap = new Bitmap(toWidth, toHeight); //定义一个指定大小的画布背景51     using (Graphics g = Graphics.FromImage(toBitmap)) //定义画图工具，使用画图工具加载画布背景,开始在画布上作图52     {53      //图片缩放时使用54      g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed; //高速度、低质量55      g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; //图像缩放质量56      //生成图片时使用57      g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //图片呈现质量，即消除锯齿58      g.Clear(Color.Transparent); //清除背景色，并设置颜色为透明 Color.Transparent59      g.DrawImage(originalImage,60         new Rectangle(0, 0, toWidth, toHeight),61         new Rectangle(0, 0, originalImage.Width, originalImage.Height),62         GraphicsUnit.Pixel);63      originalImage.Dispose();64      responseStream.Dispose();65      g.Dispose();66      return toBitmap;67     }68    }69    catch (Exception ex)70    {71     throw;72    }73   }

CutEllipse方法用来裁剪头像

 1   /// <summary> 2   /// 画圆形头像 3   /// </summary> 4   /// <param name="img">待裁剪的图片</param> 5   /// <param name="size">裁剪大小</param> 6   /// <returns></returns> 7   private static Image CutEllipse(Image img, Size size) 8   { 9    try10    {11     var rec = new Rectangle(0, 0, size.Width, size.Height); //声明位置和大小12     Bitmap bitmap = new Bitmap(size.Width, size.Height); //声明画布并指定大小13     Pen p = new Pen(Color.Transparent); //声明透明色画笔14     using (Graphics g = Graphics.FromImage(bitmap))15     {16      using (TextureBrush br = new TextureBrush(img, rec)) //声明画刷17      {18       g.SmoothingMode = SmoothingMode.HighQuality; //使绘图质量最高，即消除锯齿19       g.InterpolationMode = InterpolationMode.HighQualityBicubic;20       g.CompositingQuality = CompositingQuality.HighQuality;21 22       g.FillEllipse(br, rec); //根据指定大小和位置填充圆形23       g.DrawEllipse(p, rec); //画圆形图24       br.Dispose();25      }26      g.Dispose();27     }28     return bitmap;29    }30    catch (Exception ex)31    {32     throw;33    }34   }

 效果图：

 

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