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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(); } }} |
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原文链接：http://www.cnblogs.com/kissdodog/p/5419999.html
