public void Draw()
        {
            Bitmap   flag         = new Bitmap(fieldSize, fieldSize);
            Graphics flagGraphics = Graphics.FromImage(flag);

            BallView.DrawBall(BallModel.GetBall(), flagGraphics);
            BlocksView.DrawBlocks(BlockModel.GetBlocks(), flagGraphics);
            TankView.DrawTanks(TankModel.GetTanks(), flagGraphics);
            AppleView.DrawApples(AppleModel.GetApples(), flagGraphics);

            pictureBox.Image = flag;
        }