Rotation

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Boss
{
    class Rotation
    {
        // updating rotation
        public byte adjust(ushort[] bot, byte oldR, ushort PlayerPosX, ushort PlayerPosY)
        {

            //setting info to variables (i can take this out later)
            ushort play_x = PlayerPosX;
            ushort play_y = PlayerPosY;
            ushort bot_x = bot[0];
            ushort bot_y = bot[1];

            // Formula to extract an angle
            double angle = Math.Atan((double)(play_y - bot_y) / (double)(play_x - bot_x)) * (180.0 / 3.14159);
            byte rot = 0;

            // with formula we get 0-90 degrees for each quadrant
            // here we simply find out which quadrant it is and add the proper increment to make it rotation 0-39
            if (play_x > bot_x)
            {
                if (play_y > bot_y)// Lower Right
                {
                    rot = (byte)Math.Floor((angle / 9) + 10);
                }
                else if (play_y < bot_y)// Top Right
                {
                    rot = (byte)Math.Floor((90 + angle) / 9);
                }
            }
            else if (play_x < bot_x)
            {
                if (play_y > bot_y)// Lower Left
                {
                    rot = (byte)Math.Floor(((90 + angle) / 9) + 19);
                }
                else if (play_y < bot_y)// Top Left
                {
                    rot = (byte)Math.Floor((angle / 9) + 29);
                }
            }

            oldR = rot;
            return oldR;
        }
    }
}