利用C#代码实现图片旋转360度

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
namespace 图片旋转程序
{
 public class ImageHelper
 {
  /// <summary> 
  /// 以逆时针为方向对图像进行旋转 
  /// </summary> 
  /// <param name="b">位图流</param> 
  /// <param name="angle">旋转角度[0,360](前台给的)</param> 
  /// <returns></returns> 
  public Image RotateImg(Image b, int angle, string file)
  {
   angle = angle % 360;
   //弧度转换 
   double radian = angle * Math.PI / 180.0;
   double cos = Math.Cos(radian);
   double sin = Math.Sin(radian);
   //原图的宽和高 
   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)));
   //目标位图 
   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;
   //计算偏移量 
   Point Offset = new Point((W - w) / 2, (H - h) / 2);
   //构造图像显示区域:让图像的中心与窗口的中心点一致 
   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);
   //恢复图像在水平和垂直方向的平移 
   g.TranslateTransform(-center.X, -center.Y);
   g.DrawImage(b, rect);
   //重至绘图的所有变换 
   g.ResetTransform();
   g.Save();
   g.Dispose();
   //保存旋转后的图片 
   dsImage.Save(@"D:\img\" + Path.GetFileNameWithoutExtension(file) + "\\" + 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);   //输出E:\123\新建文本文件.txt
    Console.WriteLine(Path.GetFileNameWithoutExtension(file));
    //如果要保存的目录不存在,则先创建
    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();
  }
 }
}

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