using System;using System.Collections.Generic;using System.Drawing;using System.IO;using System.Linq;using System.Text;namespace 圖片旋轉程序{ public class ImageHelper {  /// <summary>   /// 以逆時針為方向對圖像進行旋轉   /// </summary>   /// <param name="b">位圖流</param>   /// <param name="angle">旋轉角度[0,360](前臺給的)</param>   /// <returns></returns>   public Image RotateImg(Image b, int angle, string file)  {   angle = angle % 360;   //弧度轉換    double radian = angle * Math.PI / 180.0;   double cos = Math.Cos(radian);   double sin = Math.Sin(radian);   //原圖的寬和高    int w = b.Width;   int h = b.Height;   int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));   int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));   //目標位圖    Bitmap dsImage = new Bitmap(W, H);   System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);   g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;   g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;   //計算偏移量    Point Offset = new Point((W - w) / 2, (H - h) / 2);   //構造圖像顯示區域:讓圖像的中心與窗口的中心點一致    Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);   Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);   g.TranslateTransform(center.X, center.Y);   g.RotateTransform(angle);   //恢復圖像在水平和垂直方向的平移    g.TranslateTransform(-center.X, -center.Y);   g.DrawImage(b, rect);   //重至繪圖的所有變換    g.ResetTransform();   g.Save();   g.Dispose();   //保存旋轉后的圖片    dsImage.Save(@"D:/img/" + Path.GetFileNameWithoutExtension(file) + "http://" + angle + ".png", System.Drawing.Imaging.ImageFormat.Png);   return dsImage;  }  public Image RotateImg(string filename, int angle, string file)  {   return RotateImg(GetSourceImg(filename), angle, file);  }  public Image GetSourceImg(string filename)  {   Image img;   img = Bitmap.FromFile(filename);   return img;  }  } class Program {  static void Main(string[] args)  {   string[] strArr = Directory.GetFiles(@"D:/img");   foreach (string file in strArr)   {    Console.WriteLine(file);   //輸出E:/123/新建文本文件.txt    Console.WriteLine(Path.GetFileNameWithoutExtension(file));    //如果要保存的目錄不存在,則先創建    if (!Directory.Exists(@"D:/img/" + Path.GetFileNameWithoutExtension(file)))    {     Directory.CreateDirectory(@"D:/img/" + Path.GetFileNameWithoutExtension(file));    }    FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read);    Image img = Bitmap.FromStream(fs);    ImageHelper IH = new ImageHelper();    for (int i = 1; i <= 360; i++)    {     IH.RotateImg(img, i, file);    }    fs.Close();   }   Console.ReadKey();  } }}