各式各样的图片缩略水印静态类

15 四, 2007 in Develop by 幻想曲

各种各式各样的图片缩略水印静态，注释写的不多

using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; namespace Steam.Core { public static class ImageDeal { /// <summary> /// 缩略图，按高度和宽度来缩略 ///http://www.cnblogs.com/pooeo/ /// </summary> /// <param name="image"></param> /// <param name="size"></param> /// <returns></returns> public static Image Scale(Image image, Size size) { return image.GetThumbnailImage(size.Width, size.Height, null, new IntPtr()); } /// <summary> /// 缩略图，按倍数来缩略 ///http://www.cnblogs.com/pooeo/ /// </summary> /// <param name="image">原图</param> /// <param name="multiple">放大或缩小的倍数，负数表示缩小，正数表示放大</param> /// <returns></returns> public static Image Scale(Image image, Int32 multiple) { Int32 newWidth; Int32 newHeight; Int32 absMultiple = Math.Abs(multiple); if (multiple == 0) { return image.Clone() as Image; } if (multiple < 0) { newWidth = image.Width / absMultiple; newHeight = image.Height / absMultiple; } else { newWidth = image.Width * absMultiple; newHeight = image.Height * absMultiple; } return image.GetThumbnailImage(newWidth, newHeight, null, new IntPtr()); } /// <summary> /// 固定宽度缩略 ///http://www.cnblogs.com/pooeo/ /// </summary> /// <param name="image"></param> /// <param name="width"></param> /// <returns></returns> public static Image ScaleFixWidth(Image image, Int32 width) { Int32 newWidth = width; Int32 newHeight; Double tempMultiple = (Double)newWidth / (Double)image.Width; newHeight = (Int32)(((Double)image.Height) * tempMultiple); Image newImage = new Bitmap(newWidth, newHeight); using (Graphics newGp = Graphics.FromImage(newImage)) { newGp.CompositingQuality = CompositingQuality.HighQuality; //设置高质量插值法 newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; //设置高质量,低速度呈现平滑程度 newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充 newGp.Clear(Color.Transparent); newGp.DrawImage(image, new Rectangle(0, 0, newWidth, newHeight)); } return newImage; } /// <summary> /// 固定高度缩略 ///http://www.cnblogs.com/pooeo/ /// </summary> /// <param name="image"></param> /// <param name="height"></param> /// <returns></returns> public static Image ScaleFixHeight(Image image, Int32 height) { Int32 newWidth; Int32 newHeight = height; Double tempMultiple = (Double)newHeight / (Double)image.Height; newWidth = (Int32)(((Double)image.Width) * tempMultiple); Image newImage = new Bitmap(newWidth, newHeight); using (Graphics newGp = Graphics.FromImage(newImage)) { newGp.CompositingQuality = CompositingQuality.HighQuality; //设置高质量插值法 newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; //设置高质量,低速度呈现平滑程度 newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充 newGp.Clear(Color.Transparent); newGp.DrawImage(image, new Rectangle(0, 0, newWidth, newHeight)); } return newImage; } /// <summary> /// 裁减缩略，根据固定的高度和宽度 ///http://www.cnblogs.com/pooeo/ /// </summary> /// <param name="image"></param> /// <param name="width"></param> /// <param name="heigth"></param> /// <returns></returns> public static Image ScaleCut(Image image, Int32 width, Int32 height) { int x = 0; int y = 0; int ow = image.Width; int oh = image.Height; if (width >= ow && height >= oh) { return image; } //如果结果要比原来的宽 if (width > ow) { width = ow; } if (height > oh) { height = oh; } if ((double)image.Width / (double)image.Height > (double)width / (double)height) { oh = image.Height; ow = image.Height * width / height; y = 0; x = (image.Width – ow) / 2; } else { ow = image.Width; oh = image.Width * height / width; x = 0; y = (image.Height – oh) / 2; } Image newImage = new Bitmap(width, height); using (Graphics newGp = Graphics.FromImage(newImage)) { newGp.CompositingQuality = CompositingQuality.HighQuality; //设置高质量插值法 newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; //设置高质量,低速度呈现平滑程度 newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充 newGp.Clear(Color.Transparent); newGp.DrawImage(image, new Rectangle(0, 0, width, height), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel); } return newImage; } /// <summary> /// 生成缩略图 ///http://www.cnblogs.com/pooeo/ /// </summary> /// <param name="originalImagePath">源图路径（物理路径）</param> /// <param name="thumbnailPath">缩略图路径（物理路径）</param> /// <param name="width">缩略图宽度</param> /// <param name="height">缩略图高度</param> /// <param name="mode">生成缩略图的方式</param> public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode) { Image originalImage = Image.FromFile(originalImagePath); int towidth = width; int toheight = height; int x = 0; int y = 0; int ow = originalImage.Width; int oh = originalImage.Height; switch (mode) { case "HW"://指定高宽缩放（可能变形） break; case "W"://指定宽，高按比例 toheight = originalImage.Height * width / originalImage.Width; break; case "H"://指定高，宽按比例 towidth = originalImage.Width * height / originalImage.Height; break; case "Cut"://指定高宽裁减（不变形） if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight) { oh = originalImage.Height; ow = originalImage.Height * towidth / toheight; y = 0; x = (originalImage.Width – ow) / 2; } else { ow = originalImage.Width; oh = originalImage.Width * height / towidth; x = 0; y = (originalImage.Height – oh) / 2; } break; default: break; } //新建一个bmp图片 Image bitmap = new System.Drawing.Bitmap(towidth, toheight); //新建一个画板 Graphics g = System.Drawing.Graphics.FromImage(bitmap); //设置高质量插值法 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; //设置高质量,低速度呈现平滑程度 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充 g.Clear(Color.Transparent); //在指定位置并且按指定大小绘制原图片的指定部分 g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel); try { //以jpg格式保存缩略图 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); } catch (System.Exception e) { throw e; } finally { originalImage.Dispose(); bitmap.Dispose(); g.Dispose(); } } /// <summary> /// 打水印，在某一点 ///http://www.cnblogs.com/pooeo/ /// </summary> /// <param name="image"></param> /// <param name="waterImagePath"></param> /// <param name="p"></param> public static void Makewater(Image image, String waterImagePath, Point p) { ImageDeal.Makewater(image, waterImagePath, p, ImagePosition.TopLeft); } public static void Makewater(Image image, String waterImagePath, Point p, ImagePosition imagePosition) { using (Image warterImage = Image.FromFile(waterImagePath)) { using (Graphics newGp = Graphics.FromImage(image)) { newGp.CompositingQuality = CompositingQuality.HighQuality; //设置高质量插值法 newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; //设置高质量,低速度呈现平滑程度 newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; switch (imagePosition) { case ImagePosition.BottomLeft: p.Y = image.Height – warterImage.Height – p.Y; break; case ImagePosition.TopRigth: p.X = image.Width – warterImage.Width – p.X; break; case ImagePosition.BottomRight: p.Y = image.Height – warterImage.Height – p.Y; p.X = image.Width – warterImage.Width – p.X; break; } newGp.DrawImage(warterImage, new Rectangle(p, new Size(warterImage.Width, warterImage.Height))); } } } public static void Makewater(Image image, String waterStr, Font font, Brush brush, Point p) { ImageDeal.Makewater(image, waterStr, font, brush, p, ImagePosition.TopLeft); } public static void Makewater(Image image, String waterStr, Font font, Brush brush, Point p, ImagePosition imagePosition) { using (Graphics newGp = Graphics.FromImage(image)) { Int32 stringWidth; Int32 stringHeight; stringHeight = (int)font.Size; stringWidth = (int)(((float)StringDeal.GetBitLength(waterStr) / (float)2) * (font.Size + 1)); newGp.CompositingQuality = CompositingQuality.HighQuality; //设置高质量插值法 newGp.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; //设置高质量,低速度呈现平滑程度 newGp.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //文字抗锯齿 newGp.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; switch (imagePosition) { case ImagePosition.BottomLeft: p.Y = image.Height – stringHeight – p.Y; break; case ImagePosition.TopRigth: p.X = image.Width – stringWidth – p.X; break; case ImagePosition.BottomRight: p.Y = image.Height – stringHeight – p.Y; p.X = image.Width – stringWidth – p.X; break; } newGp.DrawString(waterStr, font, brush, p); } } /// <summary> /// 高质量保存 ///http://www.cnblogs.com/pooeo/ /// </summary> /// <param name="image"></param> /// <param name="path"></param> public static void SaveQuality(Image image, String path) { ImageCodecInfo myImageCodecInfo; Encoder myEncoder; EncoderParameter myEncoderParameter; EncoderParameters myEncoderParameters; myImageCodecInfo = ImageCodecInfo.GetImageEncoders()[0]; myEncoder = Encoder.Quality; myEncoderParameters = new EncoderParameters(1); myEncoderParameter = new EncoderParameter(myEncoder, 100L); // 0-100 myEncoderParameters.Param[0] = myEncoderParameter; try { image.Save(path, myImageCodecInfo, myEncoderParameters); } finally { myEncoderParameter.Dispose(); myEncoderParameters.Dispose(); } } } public enum StringPosition { TopLeft, BottomLeft } public enum ImagePosition { TopLeft, BottomLeft, BottomRight, TopRigth } }

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http://www.cnblogs.com/pooeo/archive/2007/04/14/713373.html

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各式各样的图片缩略水印静态类

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