添加图片水印代码,CSharp代码库,德仔网

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【CSharp】添加图片水印
作者:hantianwei / 发布于2014/2/25/ 478
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;

namespace Pub.Class
{
  /// <summary>
  /// 添加水印类 只支持添加图片水印
  /// </summary>
public class Watermark
  {
    #region 私有成员
    private string modifyImagePath=null;
 private string drawedImagePath=null;
 private int rightSpace;
 private int bottoamSpace;
 private int lucencyPercent=70;
 private string outPath=null;
    #endregion

    #region 构造器
    /// <summary>
    /// 构造函数
    /// </summary>
    public Watermark() { }
    #endregion

    #region 属性
    /// <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;}
 }
 /// <summary>
    /// 获取或设置水印在修改图片中距底部的高度
 /// </summary>
 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 开始绘制水印 DrawImage
    /// <summary>
 /// 开始绘制水印
 /// </summary>
    /// <example>
    /// 
    ///   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); }
    /// 
    /// </example>
 public void 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
      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);
 
  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 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
  }
}
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