如何将位图旋转任意角度? [英] How do you rotate a bitmap an arbitrary number of degrees?
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问题描述
我有一个位图:
Bitmap UnitImageBMP
我需要将其旋转任意角度.我该怎么做呢?RotateFlip方法将仅以90度为增量旋转.
And I need to rotate it an arbitrary number of degrees. How do I do this? The RotateFlip method will only rotate in increments of 90 degrees.
推荐答案
我做了一些搜索,发现了这一点:
I did some searching for you and found this:
public static Bitmap RotateImage(Bitmap b, float angle)
{
//create a new empty bitmap to hold rotated image
Bitmap returnBitmap = new Bitmap(b.Width, b.Height);
//make a graphics object from the empty bitmap
using(Graphics g = Graphics.FromImage(returnBitmap))
{
//move rotation point to center of image
g.TranslateTransform((float)b.Width / 2, (float)b.Height / 2);
//rotate
g.RotateTransform(angle);
//move image back
g.TranslateTransform(-(float)b.Width / 2, -(float)b.Height / 2);
//draw passed in image onto graphics object
g.DrawImage(b, new Point(0, 0));
}
return returnBitmap;
}
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