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=;
private int _markY=;
private float _transparency=;
private string _fontFamily="宋体";
private Color _textColor=Color.Black;
private bool _textbold=false;
int[] sizes=new int[]{,,,,,};
/// <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(,,img.Width,img.Height),,,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=;i<;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[] {, , , , },
new float[] {, , , , },
new float[] {, , , , },
new float[] {, , , this.Transparency, }, //注意：此处为0.0f为完全透明，1.0f为完全不透明
new float[] {, , , , }};
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(,,img.Width,img.Height),,,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/,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),,,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),,,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;
}
} }
}