using System;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging;using System.IO;namespace Pub.Class{ ////// 添加水印类 只支持添加图片水印 ///publicclass Watermark { #region 私有成员
privatestring modifyImagePath=null; privatestring drawedImagePath=null; privateint rightSpace; privateint bottoamSpace; privateint lucencyPercent=70; privatestring outPath=null; #endregion#region 构造器
////// 构造函数 ///public Watermark() { } #endregion#region 属性
////// 获取或设置要修改的图像路径 ///publicstring ModifyImagePath { get{returnthis.modifyImagePath;} set{this.modifyImagePath=value;} } ////// 获取或设置在画的图片路径(水印图片) ///publicstring DrawedImagePath { get{returnthis.drawedImagePath;} set{this.drawedImagePath=value;} } ////// 获取或设置水印在修改图片中的右边距 ///publicint RightSpace { get{returnthis.rightSpace;} set{this.rightSpace=value;} } ////// 获取或设置水印在修改图片中距底部的高度 ///publicint BottoamSpace { get{returnthis.bottoamSpace;} set{this.bottoamSpace=value;} } ////// 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 ///publicint LucencyPercent { get{returnthis.lucencyPercent;} set { if(value>=0&&value<=100) this.lucencyPercent=value; } } ////// 获取或设置要输出图像的路径 ///publicstring OutPath { get{returnthis.outPath;} set{this.outPath=value;} } #endregion#region 开始绘制水印 DrawImage
////// 开始绘制水印 //////////// Watermark wm = new Watermark(); /// wm.DrawedImagePath= Server.MapPath("") + "/upfile/" + "backlogo.gif"; /// wm.ModifyImagePath=path; /// wm.RightSpace=184; /// wm.BottoamSpace=81; /// wm.LucencyPercent=50; /// wm.OutPath=Server.MapPath("") + "/upfile/" + fileName + "_new" + extension; /// wm.DrawImage(); ////// //保存加水印过后的图片,删除原始图片 /// mFileName=fileName + "_new" + extension; /// if(File.Exists(path)) { File.Delete(path); } //////publicvoid DrawImage() { Image modifyImage=null; Image drawedImage=null; Graphics g=null; try { modifyImage=Image.FromFile(this.ModifyImagePath);//建立图形对象
drawedImage=Image.FromFile(this.DrawedImagePath); g=Graphics.FromImage(modifyImage); int x=modifyImage.Width-this.rightSpace;//获取要绘制图形坐标int y=modifyImage.Height-this.BottoamSpace; float[][] matrixItems ={//设置颜色矩阵newfloat[] {1, 0, 0, 0, 0}, newfloat[] {0, 1, 0, 0, 0}, newfloat[] {0, 0, 1, 0, 0}, newfloat[] {0, 0, 0, (float)this.LucencyPercent/100f, 0}, newfloat[] {0, 0, 0, 0, 1}}; ColorMatrix colorMatrix = new ColorMatrix(matrixItems); ImageAttributes imgAttr=new ImageAttributes(); imgAttr.SetColorMatrix(colorMatrix,ColorMatrixFlag.Default,ColorAdjustType.Bitmap); g.DrawImage(//绘制阴影图像 drawedImage, new Rectangle(x,y,drawedImage.Width,drawedImage.Height), 0,0,drawedImage.Width,drawedImage.Height, GraphicsUnit.Pixel,imgAttr); string[] allowImageType={".jpg",".gif",".png",".bmp",".tiff",".wmf",".ico"};//保存文件
FileInfo file=new FileInfo(this.ModifyImagePath); ImageFormat p_w_picpathType=ImageFormat.Gif; switch(file.Extension.ToLower()) { case".jpg": p_w_picpathType=ImageFormat.Jpeg; break; case".gif": p_w_picpathType=ImageFormat.Gif; break; case".png": p_w_picpathType=ImageFormat.Png; break; case".bmp": p_w_picpathType=ImageFormat.Bmp; break; case".tif": p_w_picpathType=ImageFormat.Tiff; break; case".wmf": p_w_picpathType=ImageFormat.Wmf; break; case".ico": p_w_picpathType=ImageFormat.Icon; break; default: break; } MemoryStream ms=new MemoryStream(); modifyImage.Save(ms,p_w_picpathType); 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 }}
本文题目：C#.NET添加图片水印
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