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();}}
}