我的类库之添加水印类
/*
* 名称： 个人程序
* 版本： V1.0
* 作者： 王海鹏（Jack）
* 日期： 2011-05-17
* CLR版本： 4.0
* 命名空间名称： WHPFunction.Drawing
* 文件名： AddImageWatermark.cs
*
*QQ ： 383828353
*Email： wh2004_1@qq.com
*
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
namespace WHPFunction.Drawing
{
/// <summary>
/// 该枚举用来识别是文字水印还是图片水印
/// </summary>
public enum MarkType
{
Text, Image
}
/// <summary>
/// 实体类：实现图片水印功能：添加水印
/// </summary>
public class ImageWatermark
{
#region -------------成员变量------------
private string _text = ""; //要添加到水印的文字
/// <summary>
/// 要添加到水印的文字
/// </summary>
public string Text
{
get { return _text; }
set { _text = value; }
}
private string _imgPath = ""; //要添加到水印的图片
/// <summary>
/// 要添加到水印的图片
/// </summary>
public string ImgPath
{
get { return _imgPath; }
set { _imgPath = value; }
}
private int _markX = 5; //是水印位置横坐标
/// <summary>
/// 水印横坐标
/// </summary>
public int MarkX
{
get { return _markX; }
set { _markX = value; }
}
private int _markY = 5; //水印位置纵坐标
/// <summary>
/// 水印纵坐标
/// </summary>
public int MarkY
{
get { return _markY; }
set { _markY = value; }
}
private float _transparency = 0.9f; //水印透明度
/// <summary>
/// 透明度
/// </summary>
public float Transparency
{
get { return _transparency; }
set { _transparency = value; }
}
private string _fontFamily = "宋体"; //水印文字字体
/// <summary>
/// 字体
/// </summary>
public string FontFamily
{
get { return _fontFamily; }
set { _fontFamily = value; }
}
private Color _textColor = Color.Black; //水印字体颜色
/// <summary>
/// 字体颜色
/// </summary>
public Color TextColor
{
get { return _textColor; }
set { _textColor = value; }
}
private bool _textbold = false; //文字是否粗体
/// <summary>
/// 是否粗体
/// </summary>
public bool Textbold
{
get { return _textbold; }
set { _textbold = value; }
}
int[] sizes = new int[] { 48, 32, 16, 8, 6, 4 };//
private Image _image = null; //原图片
/// <summary>
/// 原图片
/// </summary>
public Image SourceImage
{
get { return _image; }
set { _image = value; }
}
private Image _markedImage = null; //水印后图片
/// <summary>
/// 水印后图片
/// </summary>
public Image MarkedImage
{
get { return _markedImage; }
}
private MarkType _markType = MarkType.Text; //标记类型
/// <summary>
/// 水印类型
/// </summary>
public MarkType MarkType
{
get { return _markType; }
set { _markType = value; }
}
#endregion
#region -------------构造函数------------
public ImageWatermark()
{
}
/// <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 ImageWatermark(string text,string fontFamily,bool bold,Color color,int markX,int markY)
{
this._markType=MarkType.Text;
this._text=text;
this._fontFamily=fontFamily;
this._textbold=bold;
this._textColor=color;
this._markX=markX;
this._markY=markY;
//this.Mark();
}
/// <summary>
/// 实例化一个只添加图片水印的实例
/// </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 ImageWatermark(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();
}
#endregion
#region -------------方法事件------------
//添加文字水印
/// <summary>
/// 文字水印
/// </summary>
/// <param name="img">原始图片</param>
/// <param name="text">水印文字</param>
/// <returns>添加水印后图片</returns>
public Image AddImageWaterMark(Image img,string text)
{
this.Text = text;
//首先判断图片是否是GIF动画，如果是动画则不对图片进行改动
foreach (Guid guid in img.FrameDimensionsList)
{
FrameDimension dimension = new FrameDimension(guid);
if (img.GetFrameCount(dimension) > 1)
{
return img;
}
}
//根据bitmap对象作为作图区
Bitmap newBitmap = new Bitmap(img.Width, img.Height, PixelFormat.Format32bppRgb);
//设置新建位图得分辨率
newBitmap.SetResolution(img.HorizontalResolution, img.VerticalResolution);
//创建Graphics对象，一对该位图进行操作
Graphics g = Graphics.FromImage(newBitmap);
//消除锯齿
g.SmoothingMode = SmoothingMode.HighQuality;
//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的字体大小，以适应水印文字大小的自适应
for (int i = 0; i < 6; i++)
{
//创建一个字体对象
cFont = new Font(_fontFamily, sizes[i], _textbold == true ? FontStyle.Bold : FontStyle.Regular);
//测量文本大小
size = g.MeasureString(this.Text, cFont);
//匹配第一个符合要求的字体大小
if ((ushort)size.Width < (ushort)img.Width)
{
break;
}
}
Brush brush = new SolidBrush(_textColor);
g.DrawString(text, cFont, brush, img.Width-size.Width-1, img.Height-size.Height-1);
g.Dispose();
System.IO.MemoryStream ms = new System.IO.MemoryStream();
newBitmap.Save(ms, ImageFormat.Jpeg);
img = System.Drawing.Image.FromStream(ms);
return img;
}
//添加图片水印
/// <summary>
/// 添加图片水印到图片
/// </summary>
/// <param name="img">原图</param>
/// <param name="waterImg">水印图</param>
/// <returns></returns>
public Image AddImageWaterMark(Image img, Image waterImg)
{
//首先判断图片是否是GIF动画，如果是动画则不对图片进行改动
foreach (Guid guid in img.FrameDimensionsList)
{
FrameDimension dimension = new FrameDimension(guid);
if (img.GetFrameCount(dimension) > 1)
{
return img;
}
}
//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,_transparency,0},
//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();
//将严策矩阵添加到属性
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Default);
//生成位图作图区
Bitmap newBitmap = new Bitmap(img.Width, img.Height, PixelFormat.Format32bppRgb);
//设置分辨率
newBitmap.SetResolution(img.HorizontalResolution, img.VerticalResolution);
//创建graphic
Graphics g = Graphics.FromImage(newBitmap);
//消除锯齿
g.SmoothingMode = SmoothingMode.HighQuality;
//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;
System.Drawing.Image new_img = markImg.GetThumbnailImage(img.Width / 4, markImg.Height * img.Width / markImg.Width, callb, new System.IntPtr());
g.DrawImage(new_img, new Rectangle(img.Width-new_img.Width-1, img.Height-new_img.Height-1, new_img.Width, new_img.Height), 0, 0, new_img.Width, new_img.Height, GraphicsUnit.Pixel, imageAttributes);
new_img.Dispose();
g.Dispose();
System.IO.MemoryStream ms = new System.IO.MemoryStream();
//将图像写入到memorystream中。
newBitmap.Save(ms, ImageFormat.Jpeg);
img = Image.FromStream(ms);
return img;
}
//原图足够大
else
{
g.DrawImage(markImg, new Rectangle(img.Width-markImg.Width-1, img.Height-markImg.Width-1, markImg.Width, markImg.Height), 0, 0, markImg.Width, markImg.Height, GraphicsUnit.Pixel, imageAttributes);
g.Dispose();
System.IO.MemoryStream ms = new System.IO.MemoryStream();
newBitmap.Save(ms, ImageFormat.Jpeg);
img = Image.FromStream(ms);
return img;
}
}
//private void Mark()
//{
// //this._markedImage = Mark(this.SourceImage, this.MarkType, this.Text, this._image, this.MarkX, this.MarkY, this._textbold, this._textColor, this._transparency, this._fontFamily);
//}
#endregion
}
}
posted on 2011-05-18 23:05 Henry_Wang 阅读(329) 评论(0) 编辑 收藏 举报
