图片加水印
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Drawing.Drawing2D;
namespace OG
{
public enum MarkType
{
Text,Image
}
/**//// <summary>
/// 给图片添加水印得类得描述
/// </summary>
///
public class WaterMark
{
//---------------------成员变量---------------------#region ---------------------成员变量---------------------
private string _text="";
private string _imgPath="";
private int _markX=0;
private int _markY=0;
private int _markX1 = 0;
private int _markY1 = 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};
int[] sizes = new int[] { 1000,950,900,850,800,750,700,650,600,550,500,450,400,350,300, 250, 200, 150,100,50,40,30,20,10,9,8,7,6,5,4,3,2,1 };
private Image _image=null;
private Image _markedIamge=null;
private MarkType _markType=MarkType.Text;
//---------------------构造函数---------------------#region ---------------------构造函数---------------------
/**//// <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, int markX1, int markY1, Image img)
{
this._markType=MarkType.Text;
this._text=text;
this._fontFamily=fontFamily;
this._textbold=bold;
this._textColor=color;
this._markX=markX;
this._markY = markY;
this._markX1 = markX1;
this._markY1 = markY1;
this.SourceImage = img;
this.Mark();
}
/**//// <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._markType=MarkType.Image;
this._imgPath=imagePath;
this._markX=markX;
this._markY=MarkY;
this._transparency=tranparence;
this.Mark();
}
//---------------------方法事件---------------------#region ---------------------方法事件---------------------
public Image Mark(Image img, MarkType markType, string text, Image waterImg, int markx, int marky, int markx1, int marky1,
bool bold,Color textColor,float transparence,FontFamily fontFamily)
{
//首先先判断该图片是否是 gif动画，如果为gif动画不对图片进行改动
int w = 0;
SizeF size = new SizeF();
foreach(Guid guid in img.FrameDimensionsList)
{
FrameDimension dimension= new FrameDimension(guid);
if(img.GetFrameCount(dimension)>1)
{
return img;
}
}
try
{
//添加文字水印
if(markType==MarkType.Text)
{
//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
//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<33;i++)
{
//创建一个字体对象
cFont= new Font(fontFamily,sizes[i]);
//是否加粗
if(!bold)
{
cFont= new Font(fontFamily,sizes[i],FontStyle.Regular);
}
else
{
cFont=new Font(fontFamily,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;
}
}
textColor = Color.FromArgb(100, textColor);
//创建刷子对象，准备给图片写上文字
Brush brush= new SolidBrush(textColor);
//在指定得位置写上文字
w = img.Width - (ushort)size.Width;
markx = Convert.ToInt16(w / 2);
markx1 = markx;
g.DrawString(text,cFont,brush,markx,marky);
g.DrawString(text, cFont, brush, markx1, marky1);
//g.DrawString(text, cFont, brush, markx, Convert.ToInt16(Convert.ToDouble(img.Width)*0.8));
//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
else if(markType==MarkType.Image)
{
//获得水印图像
Image markImg = waterImg;
//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, transparence, 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(markx,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(markx,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;
}
}
/**//// <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>
private void Mark()
{
MarkedImage = Mark(this.SourceImage, this.WaterMarkType, this._text, this.WaterImage, this._markX, this._markY, this._markX1, this._markY1, this._textbold, this._textColor, this._transparency, this.TextFontFamily);
}
#region 公用属性
/**/
/// <summary>
/// 水印类型
/// </summary>
public MarkType WaterMarkType
{
get
{
return _markType;
}
set
{
_markType = value;
}
}
/**/
/// <summary>
/// 文字水印得内容
/// </summary>
public string Text
{
get { return _text; }
set { _text = value; }
}
/**/
/// <summary>
/// 水印图片得路径
/// </summary>
public string WaterImagePath
{
get
{
return _imgPath;
}
set
{
this._imgPath = value;
}
}
/**/
/// <summary>
/// 水印图片
/// </summary>
public Image WaterImage
{
get
{
try
{
return Image.FromFile(this.WaterImagePath);
}
catch
{
return null;
}
}
}
/**/
/// <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 TextFontFamilyStr
{
get { return _fontFamily; }
set { _fontFamily = value; }
}
public FontFamily TextFontFamily
{
get { return new FontFamily(this.TextFontFamilyStr); }
}
/**/
/// <summary>
/// 水印文字是否加粗
/// </summary>
public bool Bold
{
get { return _textbold; }
set { _textbold = value; }
}
/**/
/// <summary>
/// 原图
/// </summary>
public Image SourceImage
{
get
{
return _image;
}
set
{
_image = value;
}
}
/**/
/// <summary>
/// 加过水印之后得图
/// </summary>
public Image MarkedImage
{
get
{
return this._markedIamge;
}
set
{
this._markedIamge = value;
}
}
#endregion
}
}
调用方法:
System.Drawing.Image myImage = null;
myImage=System.Drawing.Image.FromFile("图片路径")://得到某张图片的myimage对像
OG.WaterMark water = new OG.WaterMark("TodayComic 今日漫画", "宋体", true, Color.White, 0, Convert.ToInt16(h / 4), 0, Convert.ToInt16(h / 2), myImage);
myImage = water.MarkedImage;
myImage.Save(path);
return picname;
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