. NET equal width, equal height, equal proportion, fixed width high generated thumbnail class

generate a thumbnail image based on the original image#regionGenerate a thumbnail image based on the original image/// <summary>          ///generate thumbnails based on source images/// </summary>          /// <param name= "Imgpath_old" >Source Graph (large image) physical path</param>          /// <param name= "Imgpath_new" >Thumbnail physical path (the resulting thumbnail will be saved to that physical location)</param>          /// <param name= "width" >thumbnail width</param>          /// <param name= "height" >thumbnail height</param>          /// <param name= "mode" >thumbnail zoom mode (value "HW": Specify aspect scale, may deform; value "W": proportionally scaled by the specified width, and value "H": scaled by the specified height, width proportionally; "Cut": cut by the specified height and width, not deformed); Value "DB": equal to scale, Scale proportionally to a larger value as a standard</param>          /// <param name= "type" >extension of the file that will generate the thumbnail (only: JPG, GIF, PNG, BMP)</param>           Public Static voidMakethumbnail (stringImgpath_old,stringImgpath_new,intWidthintHeightstringModestringImageType,intXxintyy) {System.Drawing.Image img=System.Drawing.Image.FromFile (Imgpath_old); intTowidth = width;intToheight =height; intx =0;inty =0;intow =img.            Width; intOh = img. Height;Switch(mode) { Case "HW"://Specify aspect compression                    if((Double) img. Width/(Double) img. Height > (Double) Width/(Double) height)//determine what shape is a graphic{towidth=width; Toheight= img. Height * Width/img.                    Width; }                    Else if((Double) img. Width/(Double) img. Height = = (Double) Width/(Double) (height) {towidth=width; Toheight=height; }                    Else{toheight=height; Towidth= img. Width * Height/img.                    Height; }                     Break;  Case "W"://specify wide, high proportionallyToheight = img. Height * Width/img.                    Width;  Break;  Case "H"://specify high, wide proportionallyTowidth = img. Width * Height/img.                    Height;  Break;  Case "Cut"://designation Aspect cut (not deformed)                    if((Double) img. Width/(Double) img. Height > (Double) Towidth/(Double) toheight) {Oh=img.                        Height; ow= img. Height * Towidth/Toheight; Y= yy; x = (img. Width-ow)/2; }                    Else{ow=img.                        Width; Oh= img. Width * Height/Towidth; X= XX; y = (img. HEIGHT-OH)/2; }  Break;  Case "DB"://scale by a larger value (no distortion)                    if((Double) img. Width/(Double) Towidth < (Double) img. Height/(Double) {toheight) {toheight=height; Towidth= img. Width * Height/img.                    Height; }                    Else{towidth=width; Toheight= img. Height * Width/img.                    Width; }  Break; default:                     Break; }            //Create a new BMP imageSystem.Drawing.Image bitmap =NewSystem.Drawing.Bitmap (Towidth, toheight); //Create a new artboardSystem.Drawing.Graphics g =System.Drawing.Graphics.FromImage (bitmap); //setting high-quality interpolation methodsG.interpolationmode =System.Drawing.Drawing2D.InterpolationMode.High; //set high quality, low speed rendering smoothnessG.smoothingmode =System.Drawing.Drawing2D.SmoothingMode.HighQuality; //Empty the canvas and fill it with a transparent background colorg.clear (System.Drawing.Color.Transparent); //draws the specified portion of the original picture at the specified position and at the specified sizeG.drawimage (IMG,NewSystem.Drawing.Rectangle (0,0, Towidth, toheight),NewSystem.Drawing.Rectangle (x, Y, Ow, OH), System.Drawing.GraphicsUnit.Pixel); Try            {                //save thumbnails in jpg format                Switch(Imagetype.tolower ()) { Case "gif": IMG. Save (Imgpath_new, imageformat.jpeg);//generate thumbnail images                         Break;  Case "jpg": Bitmap.                        Save (Imgpath_new, System.Drawing.Imaging.ImageFormat.Jpeg);  Break;  Case "BMP": Bitmap.                        Save (Imgpath_new, SYSTEM.DRAWING.IMAGING.IMAGEFORMAT.BMP);  Break;  Case "PNG": Bitmap.                        Save (Imgpath_new, System.Drawing.Imaging.ImageFormat.Png);  Break; default: Bitmap.                        Save (Imgpath_new, System.Drawing.Imaging.ImageFormat.Jpeg);  Break; }                ////Save thumbnail image                //bitmap. Save (imgpath_new);            }            Catch(System.Exception e) {Throwe; }            finally{img.                Dispose (); Bitmap. Dispose ();            G.dispose (); }        }        #endregion

. NET equal width, equal height, equal proportion, fixed width high generated thumbnail class