using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.IO; namespace ImageDrawing {  /// <summary>  /// 图片修改类,主要是用来保护图片版权的  /// </summary>  public class ImageModification  {   #region "member fields"   private string modifyImagePath=null;   private string drawedImagePath=null;   private int rightSpace;   private int bottoamSpace;   private int lucencyPercent=70;   private string outPath=null;   #endregion   public ImageModification()   {   }   #region "propertys"   /// <summary>   /// 获取或设置要修改的图像路径   /// </summary>   public string ModifyImagePath   {    get{return this.modifyImagePath;}    set{this.modifyImagePath=value;}   }   /// <summary>   /// 获取或设置在画的图片路径(水印图片)   /// </summary>   public string DrawedImagePath   {    get{return this.drawedImagePath;}    set{this.drawedImagePath=value;}   }   /// <summary>   /// 获取或设置水印在修改图片中的右边距   /// </summary>   public int RightSpace   {    get{return this.rightSpace;}    set{this.rightSpace=value;}   }   //获取或设置水印在修改图片中距底部的高度   public int BottoamSpace   {    get{return this.bottoamSpace;}    set{this.bottoamSpace=value;}   }   /// <summary>   /// 获取或设置要绘制水印的透明度,注意是原来图片透明度的百分比   /// </summary>   public int LucencyPercent   {    get{return this.lucencyPercent;}    set    {     if(value>=0&&value<=100)      this.lucencyPercent=value;    }   }   /// <summary>   /// 获取或设置要输出图像的路径   /// </summary>   public string OutPath   {    get{return this.outPath;}    set{this.outPath=value;}   }   #endregion   #region "methods"   /// <summary>   /// 开始绘制水印   /// </summary>   public void DrawImage()   {    Image modifyImage=null;    Image drawedImage=null;    Graphics g=null;    try    {        //建立图形对象     modifyImage=Image.FromFile(this.ModifyImagePath);     drawedImage=Image.FromFile(this.DrawedImagePath);     g=Graphics.FromImage(modifyImage);     //获取要绘制图形坐标     int x=modifyImage.Width-this.rightSpace;     int y=modifyImage.Height-this.BottoamSpace;     //设置颜色矩阵     float[][] matrixItems ={              new float[] {1, 0, 0, 0, 0},              new float[] {0, 1, 0, 0, 0},              new float[] {0, 0, 1, 0, 0},              new float[] {0, 0, 0, (float)this.LucencyPercent/100f, 0},              new float[] {0, 0, 0, 0, 1}};     ColorMatrix colorMatrix = new ColorMatrix(matrixItems);     ImageAttributes imgAttr=new ImageAttributes();     imgAttr.SetColorMatrix(colorMatrix,ColorMatrixFlag.Default,ColorAdjustType.Bitmap);     //绘制阴影图像     g.DrawImage(      drawedImage,      new Rectangle(x,y,drawedImage.Width,drawedImage.Height),      0,0,drawedImage.Width,drawedImage.Height,      GraphicsUnit.Pixel,imgAttr);     //保存文件     string[] allowImageType={".jpg",".gif",".png",".bmp",".tiff",".wmf",".ico"};     FileInfo file=new FileInfo(this.ModifyImagePath);     ImageFormat imageType=ImageFormat.Gif;     switch(file.Extension.ToLower())     {      case ".jpg":       imageType=ImageFormat.Jpeg;       break;      case ".gif":       imageType=ImageFormat.Gif;       break;      case ".png":       imageType=ImageFormat.Png;       break;      case ".bmp":       imageType=ImageFormat.Bmp;       break;      case ".tif":       imageType=ImageFormat.Tiff;       break;      case ".wmf":       imageType=ImageFormat.Wmf;       break;      case ".ico":       imageType=ImageFormat.Icon;       break;      default:       break;     }     MemoryStream ms=new MemoryStream();     modifyImage.Save(ms,imageType);     byte[] imgData=ms.ToArray();     modifyImage.Dispose();     drawedImage.Dispose();     g.Dispose();     FileStream fs=null;     if(this.OutPath==null || this.OutPath=="")     {      File.Delete(this.ModifyImagePath);      fs=new FileStream(this.ModifyImagePath,FileMode.Create,FileAccess.Write);     }     else     {      fs=new FileStream(this.OutPath,FileMode.Create,FileAccess.Write);     }     if(fs!=null)     {      fs.Write(imgData,0,imgData.Length);      fs.Close();     }    }    finally    {     try     {      drawedImage.Dispose();      modifyImage.Dispose();      g.Dispose();     }     catch{;}    }   }   #endregion  } }