c# 图片旋转问题

Question

哪位大虾有c#写的图片按任意角度旋转的代码,能否共享一下,小弟急用,先谢啦

Answer 1

好像Image只能转90，180，270Bitmap bitmap1;private void InitializeBitmap()
{
    try
    {
        bitmap1 = (Bitmap)Bitmap.FromFile(@"C:\Documents and Settings\" + 
            @"All Users\Documents\My Music\music.bmp");
        PictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;
        PictureBox1.Image = bitmap1;
    }
    catch(System.IO.FileNotFoundException)
    {
        MessageBox.Show("There was an error." + 
            "Check the path to the bitmap.");
    }
}private void Button1_Click(System.Object sender, System.EventArgs e)
{    if (bitmap1 != null)
    {
        bitmap1.RotateFlip(RotateFlipType.Rotate180FlipY);
        PictureBox1.Image = bitmap1;
    }}

Answer 2

e.Graphics.RotateTransform((float)30.0);
Image image = Image.FromFile("xxxx.jpg ");
e.Graphics.DrawImage(image, new Point(0, 0));

Answer 3

旋转任意角度来了/// <summary>
        /// 任意角度旋转
        /// </summary>
        /// <param name="bmp">原始图Bitmap</param>
        /// <param name="angle">旋转角度</param>
        /// <param name="bkColor">背景色</param>
        /// <returns>输出Bitmap</returns>
        public static Bitmap KiRotate(Bitmap bmp, float angle, Color bkColor)
        ...{
            int w = bmp.Width + 2;
            int h = bmp.Height + 2;            PixelFormat pf;            if (bkColor == Color.Transparent)
            ...{
                pf = PixelFormat.Format32bppArgb;
            }
            else
            ...{
                pf = bmp.PixelFormat;
            }            Bitmap tmp = new Bitmap(w, h, pf);
            Graphics g = Graphics.FromImage(tmp);
            g.Clear(bkColor);
            g.DrawImageUnscaled(bmp, 1, 1);
            g.Dispose();            GraphicsPath path = new GraphicsPath();
            path.AddRectangle(new RectangleF(0f, 0f, w, h));
            Matrix mtrx = new Matrix();
            mtrx.Rotate(angle);
            RectangleF rct = path.GetBounds(mtrx);            Bitmap dst = new Bitmap((int)rct.Width, (int)rct.Height, pf);
            g = Graphics.FromImage(dst);
            g.Clear(bkColor);
            g.TranslateTransform(-rct.X, -rct.Y);
            g.RotateTransform(angle);
            g.InterpolationMode = InterpolationMode.HighQualityBilinear;
            g.DrawImageUnscaled(tmp, 0, 0);
            g.Dispose();            tmp.Dispose();            return dst;
        }

Answer 4

任意角度旋转
http://topic.csdn.net/u/20080703/22/97cf7963-a3dc-4051-a917-a2b92f6c6abc.html
1楼我的回答

Answer 5

            Bitmap userimage=Image.FromImage("要旋转的图片的路径");
            Graphics g = Graphics.FromImage(userimage);//userimage是要旋转的图片
            PointF Pcenter = new PointF(userimage.Width / 2, userimage.Height / 2);//Pcenter是中心点
            g.TranslateTransform(Pcenter.X, Pcenter.Y);
            g.RotateTransform(Rotate);//Rotate是要旋转的角度
            g.TranslateTransform(-Pcenter.X, -Pcenter.Y);
            g.DrawImage(temp, x, y, w, h);//x,y,w,h代表左上角的x点坐标,y点坐标,图片的宽和高
            g.ResetTransform();
            return userimage;

Answer 6

            Bitmap userimage=Image.FromImage("要旋转的图片的路径"); 
            Graphics g = Graphics.FromImage(userimage);//userimage是要旋转的图片 
            PointF Pcenter = new PointF(userimage.Width / 2, userimage.Height / 2);//Pcenter是中心点 
            g.TranslateTransform(Pcenter.X, Pcenter.Y); 
            g.RotateTransform(Rotate);//Rotate是要旋转的角度 
            g.TranslateTransform(-Pcenter.X, -Pcenter.Y); 
            g.DrawImage(temp, x, y, w, h);//x,y,w,h代表左上角的x点坐标,y点坐标,图片的宽和高 
            g.ResetTransform(); 
            return userimage; 

Answer 7

private void InitializeBitmap() 
{ 
    try 
    { 
        bitmap1 = (Bitmap)Bitmap.FromFile(@"C:\Documents and Settings\" + 
            @"All Users\Documents\My Music\music.bmp"); 
        PictureBox1.SizeMode = PictureBoxSizeMode.AutoSize; 
        PictureBox1.Image = bitmap1; 
    } 
    catch(System.IO.FileNotFoundException) 
    { 
        MessageBox.Show("There was an error." + 
            "Check the path to the bitmap."); 
    } 
} private void Button1_Click(System.Object sender, System.EventArgs e) 
{     if (bitmap1 != null) 
    { 
        bitmap1.RotateFlip(RotateFlipType.Rotate180FlipY); 
        PictureBox1.Image = bitmap1; 
    } } 
public static Bitmap KiRotate(Bitmap bmp, float angle, Color bkColor) 
        ...{ 
            int w = bmp.Width + 2; 
            int h = bmp.Height + 2;             PixelFormat pf;             if (bkColor == Color.Transparent) 
            ...{ 
                pf = PixelFormat.Format32bppArgb; 
            } 
            else 
            ...{ 
                pf = bmp.PixelFormat; 
            }             Bitmap tmp = new Bitmap(w, h, pf); 
            Graphics g = Graphics.FromImage(tmp); 
            g.Clear(bkColor); 
            g.DrawImageUnscaled(bmp, 1, 1); 
            g.Dispose();             GraphicsPath path = new GraphicsPath(); 
            path.AddRectangle(new RectangleF(0f, 0f, w, h)); 
            Matrix mtrx = new Matrix(); 
            mtrx.Rotate(angle); 
            RectangleF rct = path.GetBounds(mtrx);             Bitmap dst = new Bitmap((int)rct.Width, (int)rct.Height, pf); 
            g = Graphics.FromImage(dst); 
            g.Clear(bkColor); 
            g.TranslateTransform(-rct.X, -rct.Y); 
            g.RotateTransform(angle); 
            g.InterpolationMode = InterpolationMode.HighQualityBilinear; 
            g.DrawImageUnscaled(tmp, 0, 0); 
            g.Dispose();             tmp.Dispose();             return dst; 
        } 
 
 
.TranslateTransform(-Pcenter.X, -Pcenter.Y); 
            g.DrawImage(temp, x, y, w, h);
            g.ResetTransform(); 
            return userimage;