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Image imgPointer = pictureBox1.InitialImage;//指针
Bitmap bitmap = new Bitmap(pictureBox1.Image);//无指针的表
Graphics g = Graphics.FromImage(bitmap);
g.TranslateTransform(pictureBox1.Width/2,pictureBox1.Height/2);
g.RotateTransform(180+10); //垂直向上右偏10度
g.DrawImage(imgPointer, new Rectangle(Point.Empty, pictureBox1.InitialImage.Size));
g.Dispose();
pictureBox1.Image = bitmap;