Перемещение картинки с отражением в C# v1

small clas example: https://github.com/avk013/oop_image/blob/master/move_pic/move_pic/Form1.cs

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namespace WindowsFormsApplication96
{
    public partial class Form1 : Form
    {
        static int shag=1;
        int xto = shag;
        int x=shag,y=shag;
        public enum Direction
        {Right,Left,Up,Down,None};
        public Form1()
        {InitializeComponent();}
        public void RotatePicture(PictureBox pictureBox)
        {   Image flipImage = pictureBox.Image;
            flipImage.RotateFlip(RotateFlipType.RotateNoneFlipX); 
            pictureBox.Image = flipImage;}
        public void gopict(PictureBox pictureBox, Direction direction=Direction.None, int shag1=0)
        {   if (pictureBox.Left  <= 0) { direction = Direction.Right; }
            if (pictureBox.Left >= this.Size.Width- pictureBox.Width) { direction = Direction.Left; }
            if (pictureBox.Top  <= 0) { direction = Direction.Down; }
            if (pictureBox.Top >= this.Size.Height - pictureBox.Height) { direction = Direction.Up; }
            switch (direction)
            {   case Direction.Right:if(x<0) RotatePicture(pb1); x = shag1; break;
                case Direction.Left: if (x > 0) RotatePicture(pb1); x = -shag1; break;
                case Direction.Up: y =-shag1; break;
                case Direction.Down: y = shag1; break;
                case Direction.None: break;}
            pictureBox.Left += x; pictureBox.Top += y;}
        private void timer2_Tick(object sender, EventArgs e)
        {gopict(pb1, Direction.None,1);}
        private void button1_Click(object sender, EventArgs e)
        {gopict(pb1, Direction.Up, 5);}    
        private void button2_Click(object sender, EventArgs e)
        {gopict(pb1, Direction.Left,5);}
        private void button4_Click(object sender, EventArgs e)
        {gopict(pb1, Direction.Down, 5);}
        private void button3_Click(object sender, EventArgs e)
        {gopict(pb1, Direction.Right, 5);}
    }}