public partial class MainWindow : Window
    {
        private List<Point> snakePoints = new List <Point>();
        private Point startingPoint = new Point(100, 100);
        private Point currentPosition = new Point();
        private int direction = 0; //Steuerung mit Pfeiltasten (8,4,6,2)

        private List<Food> foodList = new List<Food>();




        public MainWindow()
        {
            InitializeComponent();


            DispatcherTimer timer = new DispatcherTimer();
            timer.Tick += new EventHandler(timer_Tick);
            timer.Interval = new TimeSpan(10000);
            timer.Start();

            this.KeyDown += new KeyEventHandler(OnButtonKeyDown);
            PaintSnake(startingPoint);
            currentPosition = startingPoint;



        }



        private void PaintSnake(Point currentPosition)
        {
            //##### Check, ob die Schlange in sich selbst fährt#####

            if (snakePoints.Contains(currentPosition))
            {
                GameOver();
            }

            Ellipse newEllipse = new Ellipse();
            newEllipse.Fill= Brushes.Red;
            newEllipse.Width = 6; //Stärke des Schlangenkörpers
            newEllipse.Height = 6; //Stärke des Schlangenkörpers
            Canvas.SetBottom(newEllipse, currentPosition.Y);
            Canvas.SetLeft(newEllipse, currentPosition.X);

            int count = paintCanvas.Children.Count;
            paintCanvas.Children.Add(newEllipse); //Ellipse auf Zeichenfläche einhängen
            snakePoints.Add(currentPosition);

            //########## Länge der Schlange begrenzen ##########
            int length = 100;

            if (count >length)
            {
                paintCanvas.Children.RemoveAt(count - length - 1);
                snakePoints.RemoveAt(count - length);
            }

            Ellipse food = new Ellipse();
            food.Fill = Brushes.Blue;
            food.Width = 4;
            food.Height = 4;
            Canvas.SetBottom(food, currentPosition.Y);
            Canvas.SetLeft(food, currentPosition.X);




            double punkte = Convert.ToInt32(lblpunkte.Content);






        }



        public partial class Food :
        {
            static Random random = new Random();
            Ellipse foodshape = new Ellipse();

            public Food (Canvas paintcanvas)

                : base (random.NextDouble() * paintcanvas.ActualWidth,
                      random.NextDouble() *paintcanvas.ActualHeight,
                      (random.NextDouble()-0.5)*100,
                      (random.NextDouble()-0.5)*100)
            {
                foodshape.Height = 5;
                foodshape.Width = 5;
                foodshape.Fill = Brushes.Blue;
            }


        }


        private void GameOver()
        {
            MessageBox.Show("You lose. Game over!");
            this.Close();


        }




        private void OnButtonKeyDown(object sender, KeyEventArgs e)
        {
            switch (e.Key)
            {
                case Key.Down:
                    direction = 2;
                    break;
                case Key.Up:
                    direction = 8;
                    break;
                case Key.Left:
                    direction = 4;
                    break;
                case Key.Right:
                    direction = 6;
                    break;


            }


        }

        private void timer_Tick(object sender, EventArgs e)
        {

            switch (direction)
            {
                case 8: //up
                    currentPosition.Y += 1;
                    PaintSnake(currentPosition);
                    break;
                case 2: //down
                    currentPosition.Y -= 1;
                    PaintSnake(currentPosition);
                    break;
                case 4: //left
                    currentPosition.X -= 1;
                    PaintSnake(currentPosition);
                    break;
                case 6: //right
                    currentPosition.X += 1;
                    PaintSnake(currentPosition);
                    break;

            }