C#旋轉圖片

semmyenator：
public static Image RotateImage(Image img, float rotationAngle)
{
Bitmap bmp = new Bitmap(img.Width, img.Height);
//Create same-size images.

Graphics gfx = Graphics.FromImage(bmp);

gfx.RotateTransform(rotationAngle);
//Rotate the image according to the incoming angle.

gfx.TranslateTransform((float)bmp.Width / 2 - img.Width / 2, (float)bmp.Height / 2 - img.Height / 2);
//Create a rotation point, this line is the center point of the image.

gfx.InterpolationMode = InterpolationMode.HighQualityBicubic;
//Set InterpolationMode to HighQualityBicubic to ensure that it does not deform after rotation.

gfx.DrawImage(img, new Point(0, 0));
//Redraw the picture.

gfx.Dispose();
return bmp;
}

10-06 21:41