using System; using System.Collections.Generic; using System.Text; using System.IO; using System.Drawing; using System.Drawing.Imaging; using System.Drawing.Drawing2D; /// <summary> /// Helper 的摘要说明 /// </summary> public class Helper {public class UpLoadHelper{#region 添加文字水印/// <summary> /// 添加文字水印 /// </summary> /// <param name="text">水印文字</param> /// <param name="file">图片文件</param> public static void AttachText(string text, string file){if (string.IsNullOrEmpty(text)){return;}if (!File.Exists(file)){return;}FileInfo oFile = new FileInfo(file);string strTempFile = Path.Combine(oFile.DirectoryName, Guid.NewGuid().ToString() + oFile.Extension);oFile.CopyTo(strTempFile);Image img = Image.FromFile(strTempFile);ImageFormat thisFormat = img.RawFormat;int nHeight = img.Height;int nWidth = img.Width;Bitmap outBmp = new Bitmap(nWidth, nHeight);Graphics g = Graphics.FromImage(outBmp);g.Clear(Color.White);// 设置画布的描绘质量 g.CompositingQuality = CompositingQuality.HighQuality;g.SmoothingMode = SmoothingMode.HighQuality;g.InterpolationMode = InterpolationMode.HighQualityBicubic;g.DrawImage(img, new Rectangle(0, 0, nWidth, nHeight), 0, 0, nWidth, nHeight, GraphicsUnit.Pixel);int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };Font crFont = null;SizeF crSize = new SizeF();//通过循环这个数组，来选用不同的字体大小 //如果它的大小小于图像的宽度，就选用这个大小的字体 for (int i = 0; i < 7; i++){//设置字体，这里是用arial，黑体 crFont = new Font("arial", sizes[i], FontStyle.Bold);//Measure the Copyright string in this Font crSize = g.MeasureString(text, crFont);if ((ushort)crSize.Width < (ushort)nWidth){ break; }}//因为图片的高度可能不尽相同, 所以定义了 //从图片底部算起预留了5%的空间 int yPixlesFromBottom = (int)(nHeight * .08);//现在使用版权信息字符串的高度来确定要绘制的图像的字符串的y坐标 float yPosFromBottom = ((nHeight - yPixlesFromBottom) - (crSize.Height / 2));//计算x坐标 float xCenterOfImg = (nWidth / 2);//把文本布局设置为居中 StringFormat StrFormat = new StringFormat();StrFormat.Alignment = StringAlignment.Center;//通过Brush来设置黑色半透明 SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));//绘制版权字符串 g.DrawString(text, //版权字符串文本 crFont, //字体 semiTransBrush2, //Brush new PointF(xCenterOfImg + 1, yPosFromBottom + 1), //位置 StrFormat); //设置成白色半透明 SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));//第二次绘制版权字符串来创建阴影效果 //记住移动文本的位置1像素 g.DrawString(text, //版权文本 crFont, //字体 semiTransBrush, //Brush new PointF(xCenterOfImg, yPosFromBottom), //位置 StrFormat);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; //获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象。 ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();ImageCodecInfo jpegICI = null;for (int x = 0; x < arrayICI.Length; x++){if (arrayICI[x].FormatDescription.Equals("JPEG")){jpegICI = arrayICI[x];//设置JPEG编码 break;}} if (jpegICI != null){ outBmp.Save(file, jpegICI, encoderParams); }else { outBmp.Save(file, thisFormat); }img.Dispose();outBmp.Dispose();File.Delete(strTempFile);}#endregion} }

/// <summary>/// 增加图片文字水印/// </summary>/// <param name="filename">文件名</param>/// <param name="watermarkText">水印文字</param>/// <param name="watermarkStatus">图片水印位置</param>/// <param name="quality">附加图片质量，1是 0不是</param> public static void AddImageSignText(Image img, string filename, string watermarkText, int watermarkStatus, int quality, string fontname, int fontsize){//System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(img);// .FromFile(filename); Graphics g = Graphics.FromImage(img);Font drawFont = new Font(fontname, fontsize, FontStyle.Regular, GraphicsUnit.Pixel);SizeF crSize;crSize = g.MeasureString(watermarkText, drawFont);float xpos = 0;float ypos = 0;switch (watermarkStatus){case 1:xpos = (float)img.Width * (float).01;ypos = (float)img.Height * (float).01;break;case 2:xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);ypos = (float)img.Height * (float).01;break;case 3:xpos = ((float)img.Width * (float).99) - crSize.Width;ypos = (float)img.Height * (float).01;break;case 4:xpos = (float)img.Width * (float).01;ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);break;case 5:xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);break;case 6:xpos = ((float)img.Width * (float).99) - crSize.Width;ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);break;case 7:xpos = (float)img.Width * (float).01;ypos = ((float)img.Height * (float).99) - crSize.Height;break;case 8:xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);ypos = ((float)img.Height * (float).99) - crSize.Height;break;case 9:xpos = ((float)img.Width * (float).99) - crSize.Width;ypos = ((float)img.Height * (float).99) - crSize.Height;break;}// System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat();// StrFormat.Alignment = System.Drawing.StringAlignment.Center;//// g.DrawString(watermarkText, drawFont, new System.Drawing.SolidBrush(System.Drawing.Color.White), xpos + 1, ypos + 1, StrFormat);// g.DrawString(watermarkText, drawFont, new System.Drawing.SolidBrush(System.Drawing.Color.Black), xpos, ypos, StrFormat); g.DrawString(watermarkText, drawFont, new SolidBrush(Color.White), xpos + 1, ypos + 1);g.DrawString(watermarkText, drawFont, new SolidBrush(Color.Black), xpos, ypos);ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();ImageCodecInfo ici = null;foreach (ImageCodecInfo codec in codecs){if (codec.MimeType.IndexOf("jpeg") > -1){ici = codec;}}EncoderParameters encoderParams = new EncoderParameters();long[] qualityParam = new long[1];if (quality < 0 || quality > 100){quality = 80;}qualityParam[0] = quality;EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);encoderParams.Param[0] = encoderParam;if (ici != null){img.Save(filename, ici, encoderParams);}else{img.Save(filename);}g.Dispose();//bmp.Dispose(); img.Dispose();}

/// <summary>/// 加上logo图片水印/// </summary>/// <param name="FilePath">源图片地址</param>/// <param name="SavePath">图片保存路径</param> public static void AddWaterMark(string FilePath, string SavePath,string logoPath){Bitmap bitmap = new Bitmap(FilePath);Graphics g = Graphics.FromImage(bitmap);System.Drawing.Image logo = System.Drawing.Image.FromFile(logoPath);//加载logo图片 if (bitmap.Width < logo.Width || bitmap.Height <= logo.Height)return;//下面定义一个矩形区域，以后在这个矩形里画上透明背景和白色字体 float rectWidth = (float)logo.Width;float rectHeight = (float)logo.Height;float rectX = bitmap.Width - rectWidth;float rectY = bitmap.Height - rectHeight;//声明矩形域 RectangleF textArea = new RectangleF(rectX, rectY, rectWidth, rectHeight);g.DrawImage(logo, textArea);MemoryStream ms = new MemoryStream();//保存为Jpg类型 bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);g.Dispose();bitmap.Dispose();logo.Dispose();FileStream fs = new FileStream(SavePath, FileMode.OpenOrCreate);fs.Write(ms.ToArray(), 0, ms.ToArray().Length);fs.Close();}