利用C#代码实现图片旋转360度

本文介绍利用C#代码实现图片旋转360度,具体实例代码已附上，仅供大家参考，希望对大家有所帮助

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									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();

									  }

									 }

									}