C#图片镜像

Question

小弟写了一个图片镜像的代码，但是运行总是出错，大家帮忙看看private void 水平镜像ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            box = new Bitmap(pictureBox1.Image);
            width = pictureBox1.Image.Width;
            height = pictureBox1.Image.Height;
            Graphics g = pictureBox1.CreateGraphics();
            Bitmap bmp = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
            g.Clear(this.BackColor);
            Color c = new Color(); ;
            for (x = 0; x < width; x++)
            {
                for (y = 0; y < height; y++)
                {
                    c = box.GetPixel(x, y);
                    bmp.SetPixel(width - 1 - x, y, c);
                }
            }
            pictureBox1.Image = bmp;
        }

Answer 1

 width = pictureBox1.Image.Width;
  height = pictureBox1.Image.Height;
to::
 width = box.Width;
  height = box.Height;ANDBitmap bmp = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
to::
Bitmap bmp = new Bitmap(width , height );

Answer 2

如果只是镜像，那么：Bitmap bmp = new Bitmap(pictureBox1.Image);
bmp.RotateFlip(RotateFlipType.RotateNoneFlipX);
pictureBox1.Image = bmp;

Answer 3

private void 垂直镜像ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            box = new Bitmap(pictureBox1.Image);
            width = pictureBox1.Image.Width;
            height = pictureBox1.Image.Height;
            Graphics g = pictureBox1.CreateGraphics();
            Bitmap bmp = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
            g.Clear(this.BackColor);
            Color c = new Color(); ;
            for (x = 0; x < width; x++)
            {
                for (y = 0; y < height; y++)
                {
                    c = box.GetPixel(x, y);
                    bmp.SetPixel(x, height - 1 - y, c);
                }
            }
            pictureBox1.Image = bmp;
        }