C#簡略生成縮略圖的辦法。本站提示廣大學習愛好者:(C#簡略生成縮略圖的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是C#簡略生成縮略圖的辦法正文
本文實例講述了C#簡略生成縮略圖的辦法。分享給年夜家供年夜家參考。詳細完成辦法以下:
/// <summary> /// 生成縮略圖 /// </summary> /// <param name="originalImagePath">源圖途徑(物理途徑)</param> /// <param name="thumbnailPath">縮略圖途徑(物理途徑)</param> /// <param name="width">縮略圖寬度</param> /// <param name="height">縮略圖高度</param> /// <param name="mode">生成縮略圖的方法</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"://指定高寬縮放(能夠變形) break; case "W"://指定寬,高按比例 toheight = originalImage.Height * width/originalImage.Width; break; case "H"://指定高,寬按比例 towidth = originalImage.Width * height/originalImage.Height; break; case "Cut"://指定高寬擴充(不變形) 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; } //新建一個bmp圖片 Image bitmap = new System.Drawing.Bitmap(towidth,toheight); //新建一個畫板 Graphics g = System.Drawing.Graphics.FromImage(bitmap); //設置高質量插值法 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //設置高質量,低速度出現膩滑水平 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空畫布並以通明配景色填充 g.Clear(Color.Transparent); //在指定地位而且按指定年夜小繪制原圖片的指定部門 g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight), new Rectangle(x, y, ow,oh), GraphicsUnit.Pixel); try { //以jpg格局保留縮略圖 bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg); } catch(System.Exception e) { throw e; } finally { originalImage.Dispose(); bitmap.Dispose(); g.Dispose(); } }
願望本文所述對年夜家的C#法式設計有所贊助。