using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace Random100.TraceRay

{

    class TraceRay

    {

        public static void Main(string[] args)

        {

            var arr = new string[20,20];

            var coord = new int[4];

​

            createArray(arr);

            displayArray(arr);

            Console.WriteLine("\r \n Choose 2 sets of coordinates (x y x1 y1, each number betwee 1 and 18");

            chooseCoord(coord, arr);

            var x = coord[0];

            var y = coord[1];

            var x1 = coord[2];

            var y1 = coord[3];

            decimal _x = x;

            decimal _y = y;

            decimal _x1 = x1;

            decimal _y1 = y1;

            //coord 0 = x 

            //coord 1 = y

            //coord 2 = x1

            //coord 3 = y1

            if (coord[1] == coord[3])

            {

                for (int i = 1; i < Math.Abs(coord[0] - coord[2]); i++)

                {

                    if (coord[0] < coord[2])

                    {

                        arr[coord[1], coord[0] + i] = " O ";

                    }

                    else

                    {

                        arr[coord[1], coord[0] - i] = " O ";

                    }

                }

            }

            else if (coord[0] == coord[2])

            {

                for (int i = 1; i < Math.Abs(coord[1] - coord[3]); i++)

                {

                    if (coord[1] < coord[3])

                    {

                        arr[coord[1] + i, coord[0]] = " O ";

                    }

                    else

                    {

                        arr[coord[1] - i, coord[0]] = " O ";

                    }

​

                }

            }

            else

            {

                var k = 1;

                for (int i = 1; i < _x1-_x;)

                {

​

                       //4 2 15 10

                        arr[y + k, x + i] = " O ";

                    Console.WriteLine(((_x1 - _x - 1) / (_y1 - _y - 1)));

                    while (k < (y1 - y))

                    {

                        if (i == Math.Round((_x1 - _x - 1) / (_y1 - _y - 1))*k)

                        {

                            k++;

                        }

                        break;

                    }

                    i++;

​

​

                }

            }

​

            displayArray(arr);

            Console.ReadLine();

​

        }

        public static void createArray(string[,] arr)

        {

            //string[,] arr = new string[10, 10];

​

​

            for (int j = 0; j < 20; j++)

            {

                arr[0, j] = " # ";

                arr[19, j] = " # ";

​

            }

            for (int i = 0; i < 20; i++)

            {

                arr[i, 0] = " # ";

                arr[i, 19] = " # ";

            }

            for (int i = 1; i < 19; i++)

            {

                for (int j = 1; j < 19; j++)

                {

                    arr[i, j] = " . ";

​

                }

            }

​

        }

        public static void displayArray(string[,] arr)

        {

​

            for (int i = 0; i < 20; i++)

            {

                for (int j = 0; j < 20; j++)

                {

                    Console.Write(arr[i, j]);

​

                }

                Console.WriteLine();

            }

​

        }

        public static void chooseCoord(int[] carr, string[,] arr)

        {

            string[] input = Console.ReadLine().Split(' ');

            for (int i = 0; i < 4; i++)

            {

                carr[i] = int.Parse(input[i]);

            }

            arr[carr[1], carr[0]] = " X ";

            arr[carr[3], carr[2]] = " X ";

​

        }

    }

}

​