網上下載的 圖片加上水印功能 只作爲一個tag

/*  * Class:WaterImage  * Use for add a water Image to the picture both words and image  * By Gary Gong From Demetersoft.com | 和信誠軟件(北京)有限公司  * 2007.07.23   create the file   *  *  * 使用說明：  * 　建議先定義一個WaterImage實例  * 　然後利用實例的屬性，去匹配需要進行操作的參數  * 　然後定義一個WaterImageManage實例  * 　利用WaterImageManage實例進行DrawImage（），印圖片水印  * 　DrawWords（）印文字水印  * -*/

using System; using System.Drawing; using System.Drawing.Imaging; using System.Drawing.Drawing2D; using System.IO; /// <summary> /// 圖片位置 /// </summary> public enum ImagePosition {     LeftTop,        //左上     LeftBottom,    //左下     RightTop,       //右上     RigthBottom,  //右下     TopMiddle,     //頂部居中     BottomMiddle, //底部居中     Center           //中心 }

/// <summary> /// 水印圖片的操作管理 Design by Gary Gong From Demetersoft.com /// </summary> public class WaterImageManage {     /// <summary>     /// 生成一個新的水印圖片製作實例     /// </summary>  public WaterImageManage ()  {   //   // TODO: Add constructor logic here   //  }

    /// <summary>     /// 添加圖片水印     /// </summary>     /// <param name="sourcePicture">源圖片文件名</param>     /// <param name="waterImage">水印圖片文件名</param>     /// <param name="alpha">透明度(0.1-1.0數值越小透明度越高)</param>     /// <param name="position">位置</param>     /// <param name="PicturePath" >圖片的路徑</param>     /// <returns>返回生成於指定文件夾下的水印文件名</returns>     public string  DrawImage(string sourcePicture,                                       string waterImage,                                       float alpha,                                       ImagePosition position,                                       string PicturePath )     {         //         // 判斷參數是否有效         //         if (sourcePicture == string.Empty || waterImage == string.Empty || alpha == 0.0 || PicturePath == string.Empty)         {             return sourcePicture;         }

        //         // 源圖片，水印圖片全路徑         //         string sourcePictureName = PicturePath + sourcePicture;         string waterPictureName = PicturePath + waterImage;         string fileSourceExtension = System.IO.Path.GetExtension(sourcePictureName).ToLower();         string fileWaterExtension = System.IO.Path.GetExtension(waterPictureName).ToLower();         //         // 判斷文件是否存在,以及類型是否正確         //         if (System.IO.File.Exists(sourcePictureName) == false ||             System.IO.File.Exists(waterPictureName) == false ||(             fileSourceExtension != ".gif" &&             fileSourceExtension != ".jpg" &&             fileSourceExtension != ".png") || (             fileWaterExtension != ".gif" &&             fileWaterExtension != ".jpg" &&             fileWaterExtension != ".png")             )         {             return sourcePicture;         }

        //         // 目標圖片名稱及全路徑         //         string targetImage = sourcePictureName.Replace ( System.IO.Path.GetExtension(sourcePictureName),"") + "_1101.jpg";

        //         // 將需要加上水印的圖片裝載到Image對象中         //         Image imgPhoto = Image.FromFile(sourcePictureName);         //         // 確定其長寬         //         int phWidth = imgPhoto.Width;         int phHeight = imgPhoto.Height;

        //         // 封裝 GDI+ 位圖，此位圖由圖形圖像及其屬性的像素數據組成。         //         Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);

        //         // 設定分辨率         //         bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

        //         // 定義一個繪圖畫面用來裝載位圖         //         Graphics grPhoto = Graphics.FromImage(bmPhoto);

        //         //同樣，由於水印是圖片，我們也需要定義一個Image來裝載它         //         Image imgWatermark = new Bitmap(waterPictureName);                 //         // 獲取水印圖片的高度和寬度         //         int wmWidth = imgWatermark.Width;         int wmHeight = imgWatermark.Height;

        //SmoothingMode：指定是否將平滑處理（消除鋸齒）應用於直線、曲線和已填充區域的邊緣。         // 成員名稱   說明         // AntiAlias      指定消除鋸齒的呈現。          // Default        指定不消除鋸齒。          // HighQuality  指定高質量、低速度呈現。          // HighSpeed   指定高速度、低質量呈現。          // Invalid        指定一個無效模式。          // None          指定不消除鋸齒。         grPhoto.SmoothingMode = SmoothingMode.AntiAlias;

        //         // 第一次描繪，將我們的底圖描繪在繪圖畫面上         //         grPhoto.DrawImage(imgPhoto,                                                                              new Rectangle(0, 0, phWidth, phHeight),                                     0,                                         0,                                           phWidth,                                       phHeight,                                          GraphicsUnit.Pixel);   

        //         // 與底圖一樣，我們需要一個位圖來裝載水印圖片。並設定其分辨率         //         Bitmap bmWatermark = new Bitmap(bmPhoto);         bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);                 //         // 繼續，將水印圖片裝載到一個繪圖畫面grWatermark         //         Graphics grWatermark = Graphics.FromImage(bmWatermark);

        //         //ImageAttributes 對象包含有關在呈現時如何操作位圖和圖元文件顏色的信息。         //               ImageAttributes imageAttributes = new ImageAttributes();

        //         //Colormap: 定義轉換顏色的映射         //         ColorMap colorMap = new ColorMap();

        //         //我的水印圖被定義成擁有綠色背景色的圖片被替換成透明         //         colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);         colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);

        ColorMap[] remapTable = { colorMap };

        imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

        float[][] colorMatrixElements = {            new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f}, // red紅色            new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f}, //green綠色            new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f}, //blue藍色                  new float[] {0.0f,  0.0f,  0.0f,  alpha, 0.0f}, //透明度                new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}};//

        //  ColorMatrix:定義包含 RGBA 空間座標的 5 x 5 矩陣。         //  ImageAttributes 類的若干方法通過使用顏色矩陣調整圖像顏色。         ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);

        imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,          ColorAdjustType.Bitmap);

        //         //上面設置完顏色，下面開始設置位置         //         int xPosOfWm;         int yPosOfWm;

        switch (position)         {             case ImagePosition .BottomMiddle :                 xPosOfWm = (phWidth-wmWidth ) / 2 ;                 yPosOfWm = phHeight- wmHeight -10;                 break ;             case ImagePosition .Center :                 xPosOfWm = (phWidth - wmWidth) / 2;                 yPosOfWm = (phHeight-wmHeight ) / 2;                 break ;             case ImagePosition .LeftBottom :                 xPosOfWm = 10;                 yPosOfWm = phHeight - wmHeight - 10;                 break ;             case ImagePosition .LeftTop :                 xPosOfWm = 10;                 yPosOfWm = 10;                 break;             case ImagePosition .RightTop :                 xPosOfWm = phWidth - wmWidth - 10;                 yPosOfWm = 10;                 break ;             case ImagePosition .RigthBottom :                 xPosOfWm = phWidth - wmWidth - 10;                 yPosOfWm = phHeight - wmHeight - 10;                 break ;             case ImagePosition.TopMiddle :                 xPosOfWm = (phWidth - wmWidth) / 2;                 yPosOfWm = 10;                 break ;             default:                 xPosOfWm = 10;                 yPosOfWm = phHeight - wmHeight - 10;                 break;         }

        //         // 第二次繪圖，把水印印上去         //         grWatermark.DrawImage(imgWatermark,          new Rectangle(xPosOfWm,                              yPosOfWm,                              wmWidth,                              wmHeight),                              0,                                           0,                                       wmWidth,                               wmHeight,                                GraphicsUnit.Pixel,                               imageAttributes);

               imgPhoto = bmWatermark;         grPhoto.Dispose();         grWatermark.Dispose();

        //         // 保存文件到服務器的文件夾裏面         //         imgPhoto.Save(targetImage, ImageFormat.Jpeg);         imgPhoto.Dispose();         imgWatermark.Dispose();         return targetImage.Replace (PicturePath,"");     }

    /// <summary>     /// 在圖片上添加水印文字     /// </summary>     /// <param name="sourcePicture">源圖片文件</param>     /// <param name="waterWords">需要添加到圖片上的文字</param>     /// <param name="alpha">透明度</param>     /// <param name="position">位置</param>     /// <param name="PicturePath">文件路徑</param>     /// <returns></returns>     public string DrawWords(string sourcePicture,                                       string waterWords,                                       float alpha,                                       ImagePosition position,                                       string PicturePath)     {         //         // 判斷參數是否有效         //         if (sourcePicture == string.Empty || waterWords == string.Empty || alpha == 0.0 || PicturePath == string.Empty)         {             return sourcePicture;         }

        //         // 源圖片全路徑         //         string sourcePictureName = PicturePath + sourcePicture;         string fileExtension = System.IO.Path.GetExtension(sourcePictureName).ToLower();

        //         // 判斷文件是否存在,以及文件名是否正確         //         if (System.IO.File.Exists(sourcePictureName) == false || (             fileExtension != ".gif"  &&             fileExtension != ".jpg" &&             fileExtension != ".png" ))         {             return sourcePicture;         }

        //         // 目標圖片名稱及全路徑         //         string targetImage = sourcePictureName.Replace(System.IO.Path.GetExtension(sourcePictureName), "") + "_0703.jpg";

        //創建一個圖片對象用來裝載要被添加水印的圖片         Image imgPhoto = Image.FromFile(sourcePictureName);

        //獲取圖片的寬和高         int phWidth = imgPhoto.Width;         int phHeight = imgPhoto.Height;

        //         //建立一個bitmap，和我們需要加水印的圖片一樣大小         Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);

        //SetResolution：設置此 Bitmap 的分辨率         //這裏直接將我們需要添加水印的圖片的分辨率賦給了bitmap         bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

        //Graphics：封裝一個 GDI+ 繪圖圖面。         Graphics grPhoto = Graphics.FromImage(bmPhoto);

        //設置圖形的品質         grPhoto.SmoothingMode = SmoothingMode.AntiAlias;

        //將我們要添加水印的圖片按照原始大小描繪（複製）到圖形中         grPhoto.DrawImage(          imgPhoto,                                           //   要添加水印的圖片          new Rectangle(0, 0, phWidth, phHeight), //  根據要添加的水印圖片的寬和高          0,                                                     //  X方向從0點開始描繪          0,                                                     // Y方向          phWidth,                                            //  X方向描繪長度          phHeight,                                           //  Y方向描繪長度          GraphicsUnit.Pixel);                              // 描繪的單位，這裏用的是像素

        //根據圖片的大小我們來確定添加上去的文字的大小         //在這裏我們定義一個數組來確定         int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };

        //字體         Font crFont = null;         //矩形的寬度和高度，SizeF有三個屬性，分別爲Height高，width寬，IsEmpty是否爲空         SizeF crSize = new SizeF();

        //利用一個循環語句來選擇我們要添加文字的型號         //直到它的長度比圖片的寬度小         for (int i = 0; i < 7; i++)         {             crFont = new Font("arial", sizes[i], FontStyle.Bold);

            //測量用指定的 Font 對象繪製並用指定的 StringFormat 對象格式化的指定字符串。             crSize = grPhoto.MeasureString(waterWords, crFont);

            // ushort 關鍵字表示一種整數數據類型             if ((ushort)crSize.Width < (ushort)phWidth)                 break;         }

        //截邊5%的距離，定義文字顯示(由於不同的圖片顯示的高和寬不同，所以按百分比截取)         int yPixlesFromBottom = (int)(phHeight * .05);

        //定義在圖片上文字的位置         float wmHeight =  crSize.Height;         float wmWidth = crSize .Width ;

        float  xPosOfWm;         float  yPosOfWm;

        switch (position)         {             case ImagePosition .BottomMiddle :                 xPosOfWm = phWidth / 2 ;                 yPosOfWm = phHeight- wmHeight -10;                 break ;             case ImagePosition .Center :                 xPosOfWm = phWidth / 2;                 yPosOfWm = phHeight / 2;                 break ;             case ImagePosition .LeftBottom :                 xPosOfWm = wmWidth;                 yPosOfWm = phHeight - wmHeight - 10;                 break ;             case ImagePosition .LeftTop :                 xPosOfWm = wmWidth/2 ;                 yPosOfWm = wmHeight / 2;                 break;             case ImagePosition .RightTop :                 xPosOfWm = phWidth - wmWidth - 10;                 yPosOfWm = wmHeight;                 break ;             case ImagePosition .RigthBottom :                 xPosOfWm = phWidth - wmWidth - 10;                 yPosOfWm = phHeight - wmHeight - 10;                 break ;             case ImagePosition.TopMiddle :                 xPosOfWm = phWidth / 2;                 yPosOfWm = wmWidth;                 break ;             default:                 xPosOfWm = wmWidth;                 yPosOfWm = phHeight - wmHeight - 10;                 break;         }

        //封裝文本佈局信息（如對齊、文字方向和 Tab 停靠位），顯示操作（如省略號插入和國家標準 (National) 數字替換）和 OpenType 功能。         StringFormat StrFormat = new StringFormat();

        //定義需要印的文字居中對齊         StrFormat.Alignment = StringAlignment.Center;

        //SolidBrush:定義單色畫筆。畫筆用於填充圖形形狀，如矩形、橢圓、扇形、多邊形和封閉路徑。         //這個畫筆爲描繪陰影的畫筆，呈灰色         int m_alpha = Convert .ToInt32 ( 256 * alpha);         SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(m_alpha, 0, 0, 0));

        //描繪文字信息，這個圖層向右和向下偏移一個像素，表示陰影效果         //DrawString 在指定矩形並且用指定的 Brush 和 Font 對象繪製指定的文本字符串。         grPhoto.DrawString(waterWords,                                    //string of text                                    crFont,                                         //font                                    semiTransBrush2,                            //Brush                                    new PointF(xPosOfWm + 1, yPosOfWm + 1),  //Position                                    StrFormat);

        //從四個 ARGB 分量（alpha、紅色、綠色和藍色）值創建 Color 結構，這裏設置透明度爲153         //這個畫筆爲描繪正式文字的筆刷，呈白色         SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));

        //第二次繪製這個圖形，建立在第一次描繪的基礎上         grPhoto.DrawString(waterWords,                 //string of text                                    crFont,                                   //font                                    semiTransBrush,                           //Brush                                    new PointF(xPosOfWm, yPosOfWm),  //Position                                    StrFormat);

        //imgPhoto是我們建立的用來裝載最終圖形的Image對象         //bmPhoto是我們用來製作圖形的容器，爲Bitmap對象         imgPhoto = bmPhoto;         //釋放資源，將定義的Graphics實例grPhoto釋放，grPhoto功德圓滿         grPhoto.Dispose();

        //將grPhoto保存         imgPhoto.Save(targetImage, ImageFormat.Jpeg);         imgPhoto.Dispose();

        return targetImage.Replace(PicturePath, "");     } }

/// <summary> /// 裝載水印圖片的相關信息 /// </summary> public class WaterImage {     public WaterImage ()     {

    }

    private string m_sourcePicture;     /// <summary>     /// 源圖片地址名字(帶後綴)     /// </summary>     public string SourcePicture     {         get { return m_sourcePicture; }         set { m_sourcePicture = value; }     }

    private string  m_waterImager;     /// <summary>     /// 水印圖片名字(帶後綴)     /// </summary>     public string  WaterPicture     {         get { return m_waterImager; }         set { m_waterImager = value; }     }

    private float  m_alpha;     /// <summary>     /// 水印圖片文字的透明度     /// </summary>     public float  Alpha     {         get { return m_alpha; }         set { m_alpha = value; }     }

    private ImagePosition  m_postition;     /// <summary>     /// 水印圖片或文字在圖片中的位置     /// </summary>     public ImagePosition  Position     {         get { return m_postition; }         set { m_postition = value; }     }

    private string  m_words;     /// <summary>     /// 水印文字的內容     /// </summary>     public string  Words     {         get { return m_words; }         set { m_words = value; }     }   }