static void Main(string[] args)
        {
            int xpos, ypos;
            for (int i = 1; i <= 16; i++)
            {
                GetPos(i, out xpos, out ypos);
                Console.WriteLine($"{i}: x={xpos}, y={ypos}");
            }
            Console.ReadLine();
        }

        static void GetPos(int value, out int posx, out int posy)
        {
            value -= 1;
            double temp = 22.5 * (90 / 22.5 - (value % 4));

            posy = (int)Math.Round(Math.Sin(temp * Math.PI / 180) * 40);
            posx = (int)Math.Round(Math.Cos(temp * Math.PI / 180) * 40);

            temp = (value - value % 4) / 4.0;

            switch (temp)
            {
                case 0:
                    posy += 50;
                    posx += 50;
                    break;
                case 1:
                    temp = posx;
                    posx = posy;
                    posy = (int)temp;
                    posy *= -1;
                    posy += 50;
                    posx += 50;
                    break;
                case 2:
                    posx *= -1;
                    posy *= -1;
                    posx += 50;
                    posy += 50;
                    break;
                case 3:
                    temp = posx;
                    posx = posy;
                    posy = (int)temp;
                    posx *= -1;
                    posx += 50;
                    posy += 50;
                    break;
            }
        }


1: x=50, y=90
2: x=65, y=87
3: x=78, y=78
4: x=87, y=65
5: x=90, y=50
6: x=87, y=35
7: x=78, y=22
8: x=65, y=13
9: x=50, y=10
10: x=35, y=13
11: x=22, y=22
12: x=13, y=35
13: x=10, y=50
14: x=13, y=65
15: x=22, y=78
16: x=35, y=87