using?System;
using?System.Collections.Generic;
using?System.Drawing;
using?System.Drawing.Drawing2D;
using?System.Drawing.Imaging;
using?System.IO;

namespace?ImageSaveRead
{
????public?static?class?IamgeReDraw
????{
????????#region?Image格式處理
????????///?

????????///?縮略圖，按高度和寬度來縮略?????????
????????///?

????????///?
????????///?
????????///?
????????public?static?Image?Scale（Image?image?Size?size）
????????{
????????????return?image.GetThumbnailImage（size.Width?size.Height?null?new?IntPtr（））;
????????}

????????///?

????????///?縮略圖，按倍數來縮略?????????
????????///?

????????///?原圖
????????///?放大或縮小的倍數，負數表示縮小，正數表示放大
????????///?
????????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?????????????{
????????????????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（））;
????????}

????????///?

????????///?固定寬度縮略?????????
????????///?

????????///?
????????///?
????????///?
????????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;

????????????????//設置高質量插值法
????????????????newGp.InterpolationMode?=?System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;

????????????????//設置高質量低速度呈現平滑程度
????????????????newGp.SmoothingMode?=?System.Drawing.Drawing2D.SmoothingMode.HighQuality;

????????????????//清空畫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;

????????}

????????///?

????????///?固定高度縮略?????????
????????///?

????????///?
????????///?
????????///?
???

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????49793??2009-05-08?17:04??IamgeReDraw.cs

-----------?---------??----------?-----??----

????????????????49793????????????????????1