项目中图片处理类代码,Asp.Net代码库,德仔网

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【Asp.Net】项目中图片处理类
作者:brainmao / 发布于2014/6/26/ 429

	#region 图片处理
	
	/// <summary>
	/// 生成缩略图
	/// </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
	/// HW : 指定高宽缩放（可能变形）
	/// W : 指定宽，高按比例缩放
	/// H : 指定高，宽按比例缩放
	/// Cut : 指定高宽裁剪（不变形）
	/// </param>
	public static void MakeThumbPhoto(string originalImagePath, string thumbnailPath, int width, int height, string mode)
	{
	 System.Drawing.Image originalImage = System.Drawing.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":
	 break;
	 case "W":
	 toheight = originalImage.Height * width / originalImage.Width;
	 break;
	 case "H":
	 towidth = originalImage.Width * height / originalImage.Height;
	 break;
	 case "Cut":
	 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
	 System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
	
	 //新建一个画板
	 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
	
	 //设置高质量插值法
	 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
	
	 //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(System.Drawing.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 System.Drawing.Rectangle(0, 0, towidth, toheight),
	 new System.Drawing.Rectangle(x, y, ow, oh),
	 System.Drawing.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>
	/// 在图片上增加文字水印
	/// </summary>
	/// <param name="path">原服务器图片路径</param>
	/// <param name="pathSY">生成的带文字水印的图片路径</param>
	/// <param name="addText">水印文字</param>
	public static void AddWater(string path, string pathSY, string addText)
	{
	 System.Drawing.Image image = System.Drawing.Image.FromFile(path);
	 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
	 g.DrawImage(image, 0, 0, image.Width, image.Height);
	 System.Drawing.Font f = new System.Drawing.Font("Verdana", 60);
	 System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.Color.Green);
	
	 g.DrawString(addText, f, b, 35, 35);
	 g.Dispose();
	
	 image.Save(pathSY);
	 image.Dispose();
	}
	
	/// <summary>
	/// 加图片水印
	/// </summary>
	/// <param name="path">原文件名</param>
	/// <param name="filename">生成文件名</param>
	/// <param name="watermarkFilename">水印文件名</param>
	/// <param name="watermarkStatus">图片水印位置:0=不使用 1=左上 2=中上 3=右上 4=左中 ... 9=右下</param>
	/// <param name="quality">是否是高质量图片 取值范围0--100</param>
	/// <param name="watermarkTransparency">图片水印透明度 取值范围1--10 (10为不透明)</param>
	public static void AddImageSignPicture(string path, string filename, string watermarkFilename, int watermarkStatus, int quality, int watermarkTransparency)
	{
	 System.Drawing.Image img = System.Drawing.Image.FromFile(path);
	 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(img);
	
	 System.Drawing.Image watermark = new System.Drawing.Bitmap(watermarkFilename);
	
	 if (watermark.Height >= img.Height || watermark.Width >= img.Width)
	 {
	 return;
	 }
	
	 System.Drawing.Imaging.ImageAttributes imageAttributes = new System.Drawing.Imaging.ImageAttributes();
	 System.Drawing.Imaging.ColorMap colorMap = new System.Drawing.Imaging.ColorMap();
	
	 colorMap.OldColor = System.Drawing.Color.FromArgb(255, 0, 255, 0);
	 colorMap.NewColor = System.Drawing.Color.FromArgb(0, 0, 0, 0);
	 System.Drawing.Imaging.ColorMap[] remapTable = { colorMap };
	
	 imageAttributes.SetRemapTable(remapTable, System.Drawing.Imaging.ColorAdjustType.Bitmap);
	
	 float transparency = 0.5F;
	 if (watermarkTransparency >= 1 && watermarkTransparency <= 10)
	 {
	 transparency = (watermarkTransparency / 10.0F);
	 }
	
	 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, transparency, 0.0f},
	 new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}
	 };
	
	 System.Drawing.Imaging.ColorMatrix colorMatrix = new System.Drawing.Imaging.ColorMatrix(colorMatrixElements);
	
	 imageAttributes.SetColorMatrix(colorMatrix, System.Drawing.Imaging.ColorMatrixFlag.Default, System.Drawing.Imaging.ColorAdjustType.Bitmap);
	
	 int xpos = 0;
	 int ypos = 0;
	
	 switch (watermarkStatus)
	 {
	 case 1:
	 xpos = (int)(img.Width * (float).01);
	 ypos = (int)(img.Height * (float).01);
	 break;
	 case 2:
	 xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));
	 ypos = (int)(img.Height * (float).01);
	 break;
	 case 3:
	 xpos = (int)((img.Width * (float).99) - (watermark.Width));
	 ypos = (int)(img.Height * (float).01);
	 break;
	 case 4:
	 xpos = (int)(img.Width * (float).01);
	 ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));
	 break;
	 case 5:
	 xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));
	 ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));
	 break;
	 case 6:
	 xpos = (int)((img.Width * (float).99) - (watermark.Width));
	 ypos = (int)((img.Height * (float).50) - (watermark.Height / 2));
	 break;
	 case 7:
	 xpos = (int)(img.Width * (float).01);
	 ypos = (int)((img.Height * (float).99) - watermark.Height);
	 break;
	 case 8:
	 xpos = (int)((img.Width * (float).50) - (watermark.Width / 2));
	 ypos = (int)((img.Height * (float).99) - watermark.Height);
	 break;
	 case 9:
	 xpos = (int)((img.Width * (float).99) - (watermark.Width));
	 ypos = (int)((img.Height * (float).99) - watermark.Height);
	 break;
	 }
	
	 g.DrawImage(watermark, new System.Drawing.Rectangle(xpos, ypos, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, System.Drawing.GraphicsUnit.Pixel, imageAttributes);
	
	 System.Drawing.Imaging.ImageCodecInfo[] codecs = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
	 System.Drawing.Imaging.ImageCodecInfo ici = null;
	 foreach (System.Drawing.Imaging.ImageCodecInfo codec in codecs)
	 {
	 if (codec.MimeType.IndexOf("jpeg") > -1)
	 {
	 ici = codec;
	 }
	 }
	 System.Drawing.Imaging.EncoderParameters encoderParams = new System.Drawing.Imaging.EncoderParameters();
	 long[] qualityParam = new long[1];
	 if (quality < 0 || quality > 100)
	 {
	 quality = 80;
	 }
	 qualityParam[0] = quality;
	
	 System.Drawing.Imaging.EncoderParameter encoderParam = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
	 encoderParams.Param[0] = encoderParam;
	
	 if (ici != null)
	 {
	 img.Save(filename, ici, encoderParams);
	 }
	 else
	 {
	 img.Save(filename);
	 }
	
	 g.Dispose();
	 img.Dispose();
	 watermark.Dispose();
	 imageAttributes.Dispose();
	}
	
	/// <summary>
	/// 在图片上生成图片水印
	/// </summary>
	/// <param name="path">原服务器图片路径</param>
	/// <param name="pathSY">生成的带图片水印的图片路径</param>
	/// <param name="pathSYP">水印图片路径</param>
	public static void AddWaterPicture(string path, string pathSY, string pathSYP)
	{
	 System.Drawing.Image image = System.Drawing.Image.FromFile(path);
	 System.Drawing.Image copyImage = System.Drawing.Image.FromFile(pathSYP);
	 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
	 g.DrawImage(copyImage, new System.Drawing.Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
	 g.Dispose();
	
	 image.Save(pathSY);
	 image.Dispose();
	}
	
	#endregion
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