为什么我创建的图象翻转不到的？

Question

怎么旋转后再绘画会变成什么都看不见的？
Image I=new Bitmap(100,100);
Graphics g=Graphics.FromImage(I);
g.FillRectangle(new System.Drawing.SolidBrush(Color.White),0,0,100,100);
g.RotateTransform(90);
g.DrawString("abc",new Font("",10,System.Drawing.FontStyle.Bold),new SolidBrush(Color.Black),0,0);
I.Save("i.jpg",System.Drawing.Imaging.ImageFormat.Jpeg);

Answer 1

g.RotateTransform(90);加个F试试
g.RotateTransform(90F);

Answer 2

说的先旋转是指图像先旋转，使用Bitmap的成员RotateFlip方法，将图形翻转成你需要的角度，然后再使用g进行绘图，这样肯定没有问题的！

Answer 3

To:hychieftain加個f也不行啊
Image I=new Bitmap(100,100);
Graphics g=Graphics.FromImage(I);
g.FillRectangle(new System.Drawing.SolidBrush(Color.White),0,0,100,100);
g.DrawString("abc",new Font("",10,System.Drawing.FontStyle.Bold),new SolidBrush(Color.Black),0,0);
g.RotateTransform(90f);
I.Save("i.jpg",System.Drawing.Imaging.ImageFormat.Jpeg);

Answer 4

TO:haohaohaohao按照你这样也不行啊Image I=new Bitmap(100,100);
I.RotateFlip(System.Drawing.RotateFlipType.Rotate90FlipX);
Graphics g=Graphics.FromImage(I);
g.FillRectangle(new System.Drawing.SolidBrush(Color.White),0,0,100,100);
g.DrawString("abc",new Font("",10,System.Drawing.FontStyle.Bold),new SolidBrush(Color.Black),0,0);
I.Save("i.jpg",System.Drawing.Imaging.ImageFormat.Jpeg);

Answer 5

原来要这样才行
Image I=new Bitmap(100,100);
Graphics g=Graphics.FromImage(I);
g.FillRectangle(new System.Drawing.SolidBrush(Color.White),0,0,100,100);
g.DrawString("abc",new Font("",10,System.Drawing.FontStyle.Bold),new SolidBrush(Color.Black),0,0);
I.RotateFlip(System.Drawing.RotateFlipType.Rotate90FlipNone);
I.Save("i.jpg",System.Drawing.Imaging.ImageFormat.Jpeg);