图片添加水印，裁剪帮助类

图片裁剪，水印帮助类

using System;
using System.IO;
using System.Collections;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;namespace WebApplication1.Common
{<summary>/// 水印的类型/// </summary>public enum WaterMarkType{<summary>/// 文字水印/// </summary>TextMark,<summary>/// 图片水印/// </summary>//ImageMark // 暂时只能添加文字水印};<summary>/// 水印的位置/// </summary>public enum WaterMarkPosition{<summary>/// 左上角/// </summary>WMP_Left_Top,<summary>/// 左下角/// </summary>WMP_Left_Bottom,<summary>/// 右上角/// </summary>WMP_Right_Top,/// <summary>/// 右下角/// </summary>WMP_Right_Bottom};/// <summary>/// 处理图片的类（包括加水印，生成缩略图）/// </summary>public class ImageHelper{public ImageHelper(){//// TODO: 在此处添加构造函数逻辑//}#region 给图片加水印/// <summary>/// 添加水印(分图片水印与文字水印两种)/// </summary>/// <param name="oldpath">原图片绝对地址</param>/// <param name="newpath">新图片放置的绝对地址</param>/// <param name="wmtType">要添加的水印的类型</param>/// <param name="sWaterMarkContent">水印内容，若添加文字水印，此即为要添加的文字；/// 若要添加图片水印，此为图片的路径</param>public void addWaterMark(string oldpath, string newpath, WaterMarkType wmtType, string sWaterMarkContent){try{Image image = Image.FromFile(oldpath);Bitmap b = new Bitmap(image.Width, image.Height, PixelFormat.Format24bppRgb);Graphics g = Graphics.FromImage(b);g.Clear(Color.Red);g.SmoothingMode = SmoothingMode.HighQuality;g.InterpolationMode = InterpolationMode.High;g.DrawImage(image, 0, 0, image.Width, image.Height);switch (wmtType){/*case WaterMarkType.ImageMark://图片水印this.addWatermarkImage(g, Page.Server.MapPath(Watermarkimgpath), WatermarkPosition,image.Width,image.Height);break;*/case WaterMarkType.TextMark://文字水印this.addWatermarkText(g, sWaterMarkContent, "WM_BOTTOM_RIGHT", image.Width, image.Height);break;}b.Save(newpath);b.Dispose();image.Dispose();}catch{if(File.Exists(oldpath)){File.Delete(oldpath);}}finally{if(File.Exists(oldpath)){File.Delete(oldpath);}}  }/// <summary>///  加水印文字/// </summary>/// <param name="picture">imge 对象</param>/// <param name="_watermarkText">水印文字内容</param>/// <param name="_watermarkPosition">水印位置</param>/// <param name="_width">被加水印图片的宽</param>/// <param name="_height">被加水印图片的高</param>private void addWatermarkText(Graphics picture, string _watermarkText, string _watermarkPosition, int _width, int _height){// 确定水印文字的字体大小int[] sizes = new int[]{32, 30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4};Font crFont = null;SizeF crSize = new SizeF();for (int i = 0;i < sizes.Length; i++){crFont = new Font("Arial Black", sizes[i], FontStyle.Bold);crSize = picture.MeasureString(_watermarkText, crFont);if((ushort)crSize.Width < (ushort)_width){break;}}// 生成水印图片（将文字写到图片中）Bitmap floatBmp = new Bitmap((int)crSize.Width + 3, (int)crSize.Height + 3, PixelFormat.Format32bppArgb);Graphics fg=Graphics.FromImage(floatBmp);PointF pt=new PointF(0,0);// 画阴影文字Brush TransparentBrush0 = new SolidBrush(Color.FromArgb(255, Color.Black));Brush TransparentBrush1 = new SolidBrush(Color.FromArgb(255, Color.Black));fg.DrawString(_watermarkText,crFont,TransparentBrush0, pt.X, pt.Y + 1); fg.DrawString(_watermarkText,crFont,TransparentBrush0, pt.X + 1, pt.Y); fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X + 1, pt.Y + 1); fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X, pt.Y + 2); fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X + 2, pt.Y); TransparentBrush0.Dispose(); TransparentBrush1.Dispose();// 画文字fg.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality; fg.DrawString(_watermarkText, crFont, new SolidBrush(Color.White), pt.X, pt.Y, StringFormat.GenericDefault);// 保存刚才的操作fg.Save(); fg.Dispose();// floatBmp.Save("d:\\WebSite\\DIGITALKM\\ttt.jpg");// 将水印图片加到原图中this.addWatermarkImage(picture, new Bitmap(floatBmp), "WM_BOTTOM_RIGHT", _width, _height);}/// <summary>///  加水印图片/// </summary>/// <param name="picture">imge 对象</param>/// <param name="iTheImage">Image对象（以此图片为水印）</param>/// <param name="_watermarkPosition">水印位置</param>/// <param name="_width">被加水印图片的宽</param>/// <param name="_height">被加水印图片的高</param>private void addWatermarkImage( Graphics picture,Image iTheImage, string _watermarkPosition,int _width,int _height){Image watermark = new Bitmap(iTheImage);ImageAttributes imageAttributes = new ImageAttributes();ColorMap colorMap = new ColorMap();colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);ColorMap[] remapTable = {colorMap};imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);float[][] colorMatrixElements = {new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},new float[] {0.0f, 0.0f, 0.0f, 0.3f, 0.0f},new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}};ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);int xpos = 0;int ypos = 0;int WatermarkWidth = 0;int WatermarkHeight = 0;double bl = 1d;//计算水印图片的比率//取背景的1/4宽度来比较if ((_width > watermark.Width * 4) && (_height > watermark.Height * 4)){bl = 1;}else if ((_width > watermark.Width * 4) && (_height<watermark.Height * 4)){bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);}else if ((_width < watermark.Width * 4) && (_height > watermark.Height * 4)){bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);}else{if ((_width * watermark.Height) > (_height * watermark.Width)){bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);}else{bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);}}WatermarkWidth = Convert.ToInt32(watermark.Width * bl);WatermarkHeight = Convert.ToInt32(watermark.Height * bl);switch (_watermarkPosition){case "WM_TOP_LEFT":xpos = 10;ypos = 10;break;case "WM_TOP_RIGHT":xpos = _width - WatermarkWidth - 10;ypos = 10;break;case "WM_BOTTOM_RIGHT":xpos = _width - WatermarkWidth - 10;ypos = _height -WatermarkHeight - 10;break;case "WM_BOTTOM_LEFT":xpos = 10;ypos = _height - WatermarkHeight - 10;break;}picture.DrawImage(watermark, new Rectangle(xpos, ypos, WatermarkWidth, WatermarkHeight), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);watermark.Dispose();imageAttributes.Dispose();}/// <summary>///  加水印图片/// </summary>/// <param name="picture">imge 对象</param>/// <param name="WaterMarkPicPath">水印图片的地址</param>/// <param name="_watermarkPosition">水印位置</param>/// <param name="_width">被加水印图片的宽</param>/// <param name="_height">被加水印图片的高</param>private void addWatermarkImage( Graphics picture,string WaterMarkPicPath, string _watermarkPosition,int _width,int _height){Image watermark = new Bitmap(WaterMarkPicPath);this.addWatermarkImage(picture, watermark, _watermarkPosition, _width, _height);}#endregion#region 生成缩略图/// <summary>/// 保存图片/// </summary>/// <param name="image">Image 对象</param>/// <param name="savePath">保存路径</param>/// <param name="ici">指定格式的编解码参数</param>private void SaveImage(Image image, string savePath, ImageCodecInfo ici){//设置 原图片 对象的 EncoderParameters 对象EncoderParameters parameters = new EncoderParameters(1);parameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long) 90));image.Save(savePath, ici, parameters);parameters.Dispose();}/// <summary>/// 获取图像编码解码器的所有相关信息/// </summary>/// <param name="mimeType">包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param>/// <returns>返回图像编码解码器的所有相关信息</returns>private ImageCodecInfo GetCodecInfo(string mimeType){ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();foreach(ImageCodecInfo ici in CodecInfo){if(ici.MimeType == mimeType)return ici;}return null;}/// <summary>/// 生成缩略图/// </summary>/// <param name="sourceImagePath">原图片路径(相对路径)</param>/// <param name="thumbnailImagePath">生成的缩略图路径,如果为空则保存为原图片路径(相对路径)</param>/// <param name="thumbnailImageWidth">缩略图的宽度（高度与按源图片比例自动生成）</param>public void ToThumbnailImages(string SourceImagePath,string ThumbnailImagePath,int ThumbnailImageWidth){Hashtable htmimes = new Hashtable();htmimes[".jpeg"] = "image/jpeg";htmimes[".jpg"] = "image/jpeg";   htmimes[".png"] = "image/png";   htmimes[".tif"] = "image/tiff";htmimes[".tiff"] = "image/tiff";htmimes[".bmp"] = "image/bmp";htmimes[".gif"] = "image/gif";// 取得原图片的后缀string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(".")).ToLower();//从 原图片 创建 Image 对象Image image = Image.FromFile(SourceImagePath);  int num = ((ThumbnailImageWidth / 4) * 3);int width = image.Width;int height = image.Height;//计算图片的比例if ((((double) width) / ((double) height)) >= 1.3333333333333333f){num = ((height * ThumbnailImageWidth) / width);}else{ThumbnailImageWidth = ((width * num) / height);}if ((ThumbnailImageWidth < 1) || (num < 1)){return;}//用指定的大小和格式初始化 Bitmap 类的新实例Bitmap bitmap = new Bitmap(ThumbnailImageWidth, num, PixelFormat.Format32bppArgb);//从指定的 Image 对象创建新 Graphics 对象Graphics graphics = Graphics.FromImage(bitmap);//清除整个绘图面并以透明背景色填充graphics.Clear(Color.Transparent);graphics.SmoothingMode = SmoothingMode.HighQuality;graphics.InterpolationMode = InterpolationMode.High;//在指定位置并且按指定大小绘制 原图片 对象graphics.DrawImage(image, new Rectangle(0, 0, ThumbnailImageWidth, num));image.Dispose(); try{   //将此 原图片 以指定格式并用指定的编解码参数保存到指定文件 SaveImage(bitmap, ThumbnailImagePath, GetCodecInfo((string)htmimes[sExt]));}catch(System.Exception e){throw e;}}#endregion/// <summary>/// 图片加水印文字/// </summary>/// <param name="oldpath">旧图片地址</param>/// <param name="text">水印文字</param>/// <param name="newpath">新图片地址</param>/// <param name="Alpha">透明度</param>/// <param name="fontsize">字体大小</param>public  void AddWaterText(string oldpath, string text, string newpath, int Alpha, int fontsize){try{text = text + "版权所有";FileStream fs = new FileStream(oldpath, FileMode.Open);BinaryReader br = new BinaryReader(fs);byte[] bytes = br.ReadBytes((int)fs.Length);br.Close();fs.Close();MemoryStream ms = new MemoryStream(bytes);System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(ms);int imgPhotoWidth = imgPhoto.Width;int imgPhotoHeight = imgPhoto.Height;Bitmap bmPhoto = new Bitmap(imgPhotoWidth, imgPhotoHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);bmPhoto.SetResolution(72, 72);Graphics gbmPhoto = Graphics.FromImage(bmPhoto);//gif背景色gbmPhoto.Clear(Color.FromName("white"));gbmPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;gbmPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;gbmPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, imgPhotoWidth, imgPhotoHeight), 0, 0, imgPhotoWidth, imgPhotoHeight, GraphicsUnit.Pixel);System.Drawing.Font font = null;System.Drawing.SizeF crSize = new SizeF();font = new Font("宋体", fontsize, FontStyle.Bold);//测量指定区域crSize = gbmPhoto.MeasureString(text, font);float y = imgPhotoHeight - crSize.Height;float x = imgPhotoWidth - crSize.Width;System.Drawing.StringFormat StrFormat = new System.Drawing.StringFormat();StrFormat.Alignment = System.Drawing.StringAlignment.Center;//画两次制造透明效果System.Drawing.SolidBrush semiTransBrush2 = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 56, 56, 56));gbmPhoto.DrawString(text, font, semiTransBrush2, x + 1, y + 1);System.Drawing.SolidBrush semiTransBrush = new System.Drawing.SolidBrush(Color.FromArgb(Alpha, 176, 176, 176));gbmPhoto.DrawString(text, font, semiTransBrush, x, y);bmPhoto.Save(newpath, System.Drawing.Imaging.ImageFormat.Jpeg);gbmPhoto.Dispose();imgPhoto.Dispose();bmPhoto.Dispose();}catch{                ;                }}}
}

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