using System; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Drawing.Drawing2D; namespace JillZhang { /// <summary> /// 给图片添加水印得类得描述 /// </summary> public class WaterMark { private bool _textMark=false; private bool _imgMark=false; private string _text=""; private string _imgPath=""; private int _markX=0; private int _markY=0; private float _transparency=1; private string _fontFamily="宋体"; private Color _textColor=Color.Black; private bool _textbold=false; int[] sizes=new int[]{48,32,16,8,6,4}; /// <summary> /// 实例化一个水印类 /// </summary> public WaterMark() { } /// <summary> /// 初始化一个只添加文字水印得实例 /// </summary> /// <param name="text">水印文字</param> /// <param name="fontFamily">文字字体</param> /// <param name="bold">是否粗体</param> /// <param name="color">字体颜色</param> /// <param name="markX">标记位置横坐标</param> /// <param name="markY">标记位置纵坐标</param> public WaterMark(string text,string fontFamily,bool bold,Color color,int markX,int markY) { this._imgMark=false; this._textMark=true; this._text=text; this._fontFamily=fontFamily; this._textbold=bold; this._textColor=color; this._markX=markX; this._markY=MarkY; } /// <summary> /// 实例化一个只添加图片水印得实例 /// </summary> /// <param name="imagePath">水印图片路径</param> /// <param name="tranparence">透明度</param> /// <param name="markX">标记位置横坐标</param> /// <param name="markY">标记位置纵坐标</param> public WaterMark(string imagePath,float tranparence,int markX,int markY) { this._textMark=false; this._imgMark=true; this._imgPath=imagePath; this._markX=markX; this._markY=MarkY; this._transparency=tranparence; } /// <summary> /// 是否添加文字水印 /// </summary> public bool TextMark { get{return _textMark;} set{_textMark=value;} } /// <summary> /// 是否添加图片水印 /// </summary> public bool ImageMark { get{return _imgMark;} set{_imgMark=value;} } /// <summary> /// 文字水印得内容 /// </summary> public string Text { get{return _text;} set{_text=value;} } /// <summary> /// 图片水印得图片地址 /// </summary> public string ImagePath { get{return _imgPath;} set{_imgPath=value;} } /// <summary> /// 添加水印位置得横坐标 /// </summary> public int MarkX { get{return _markX;} set{_markX=value;} } /// <summary> /// 添加水印位置得纵坐标 /// </summary> public int MarkY { get{return _markY;} set{_markY=value;} } /// <summary> /// 水印得透明度 /// </summary> public float Transparency { get{ if(_transparency>1.0f) { _transparency=1.0f; } return _transparency;} set{_transparency=value;} } /// <summary> /// 水印文字得颜色 /// </summary> public Color TextColor { get{return _textColor;} set{_textColor=value;} } /// <summary> /// 水印文字得字体 /// </summary> public string TextFontFamily { get{return _fontFamily;} set{_fontFamily=value;} } /// <summary> /// 水印文字是否加粗 /// </summary> public bool Bold { get{return _textbold;} set{_textbold=value;} } /// <summary> /// 添加水印，此方法适用于gif格式得图片 /// </summary> /// <param name="image">需要添加水印得图片</param> /// <returns>添加水印之后得图片</returns> public Image Mark(Image img) { try { //添加文字水印 if(this.TextMark) { //根据源图片生成新的Bitmap对象作为作图区，为了给gif图片添加水印，才有此周折 Bitmap newBitmap=new Bitmap(img.Width,img.Height,PixelFormat.Format24bppRgb); //设置新建位图得分辨率 newBitmap.SetResolution(img.HorizontalResolution,img.VerticalResolution); //创建Graphics对象，以对该位图进行操作 Graphics g = Graphics.FromImage(newBitmap); //消除锯齿 g.SmoothingMode=SmoothingMode.AntiAlias; //将原图拷贝到作图区 g.DrawImage(img,new Rectangle(0,0,img.Width,img.Height),0,0,img.Width,img.Height,GraphicsUnit.Pixel); //声明字体对象 Font cFont = null; //用来测试水印文本长度得尺子 SizeF size=new SizeF(); //探测出一个适合图片大小得字体大小，以适应水印文字大小得自适应 for(int i=0;i<6;i++) { //创建一个字体对象 cFont= new Font(this.TextFontFamily,sizes[i]); //是否加粗 if(!this.Bold) { cFont= new Font(this.TextFontFamily,sizes[i],FontStyle.Regular); } else { cFont=new Font(this.TextFontFamily,sizes[i],FontStyle.Bold); } //测量文本大小 size=g.MeasureString(this.Text,cFont); //匹配第一个符合要求得字体大小 if((ushort)size.Width<(ushort)img.Width) { break; } } //创建刷子对象，准备给图片写上文字 Brush brush= new SolidBrush(this.TextColor); //在指定得位置写上文字 g.DrawString(this.Text,cFont,brush,this.MarkX,this.MarkY); //释放Graphics对象 g.Dispose(); //将生成得图片读入MemoryStream System.IO.MemoryStream ms = new System.IO.MemoryStream(); newBitmap.Save(ms,ImageFormat.Jpeg); //重新生成Image对象 img=System.Drawing.Image.FromStream(ms); //返回新的Image对象 return img; } //添加图像水印 if(this.ImageMark) { //获得水印图像 Image markImg = Image.FromFile(this.ImagePath); //创建颜色矩阵 float[][] ptsArray ={ 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, this.Transparency, 0}, //注意：此处为0.0f为完全透明，1.0f为完全不透明 new float[] {0, 0, 0, 0, 1}}; ColorMatrix colorMatrix= new ColorMatrix(ptsArray); //新建一个Image属性 ImageAttributes imageAttributes= new ImageAttributes(); //将颜色矩阵添加到属性 imageAttributes.SetColorMatrix(colorMatrix,ColorMatrixFlag.Default, ColorAdjustType.Default); //生成位图作图区 Bitmap newBitmap=new Bitmap(img.Width,img.Height,PixelFormat.Format24bppRgb); //设置分辨率 newBitmap.SetResolution(img.HorizontalResolution,img.VerticalResolution); //创建Graphics Graphics g = Graphics.FromImage(newBitmap); //消除锯齿 g.SmoothingMode=SmoothingMode.AntiAlias; //拷贝原图到作图区 g.DrawImage(img,new Rectangle(0,0,img.Width,img.Height),0,0,img.Width,img.Height,GraphicsUnit.Pixel); //如果原图过小 if(markImg.Width>img.Width||markImg.Height>img.Height) { System.Drawing.Image.GetThumbnailImageAbort callb=null; //对水印图片生成缩略图,缩小到原图得1/4 System.Drawing.Image new_img=markImg.GetThumbnailImage(img.Width/4,markImg.Height*img.Width/markImg.Width,callb,new System.IntPtr()); //添加水印 g.DrawImage(new_img,new Rectangle(this.MarkX,this.MarkY,new_img.Width,new_img.Height),0,0,new_img.Width,new_img.Height,GraphicsUnit.Pixel,imageAttributes); //释放缩略图 new_img.Dispose(); //释放Graphics g.Dispose(); //将生成得图片读入MemoryStream System.IO.MemoryStream ms = new System.IO.MemoryStream(); newBitmap.Save(ms,ImageFormat.Jpeg); //返回新的Image对象 img=Image.FromStream(ms); return img; } //原图足够大 else { //添加水印 g.DrawImage(markImg,new Rectangle(this.MarkX,this.MarkY,markImg.Width,markImg.Height),0,0,markImg.Width,markImg.Height,GraphicsUnit.Pixel,imageAttributes); //释放Graphics g.Dispose(); //将生成得图片读入MemoryStream System.IO.MemoryStream ms = new System.IO.MemoryStream(); newBitmap.Save(ms,ImageFormat.Jpeg); //返回新的Image对象 img=Image.FromStream(ms); return img; } } return img; } catch { return img; } } } }