class Program
    {
        internal class Point
        {
            private int p1;
            private int p2;

            public Point(int p1, int p2)
            {
                // TODO: Complete member initialization
                this.p1 = p1;
                this.p2 = p2;
            }
             
        }
        public static IEnumerable<Point> GetPointsOnLine(int x0, int y0, int x1, int y1)
        {
            bool steep = Math.Abs(y1 - y0) > Math.Abs(x1 - x0);
            if (steep)
            {
                int t;
                t = x0; // swap x0 and y0
                x0 = y0;
                y0 = t;
                t = x1; // swap x1 and y1
                x1 = y1;
                y1 = t;
            }
            if (x0 > x1)
            {
                int t;
                t = x0; // swap x0 and x1
                x0 = x1;
                x1 = t;
                t = y0; // swap y0 and y1
                y0 = y1;
                y1 = t;
            }
            int dx = x1 - x0;
            int dy = Math.Abs(y1 - y0);
            int error = dx / 2;
            int ystep = (y0 < y1) ? 1 : -1;
            int y = y0;
            for (int x = x0; x <= x1; x++)
            {
                yield return new Point((steep ? y : x), (steep ? x : y));
                error = error - dy;
                if (error < 0)
                {
                    y += ystep;
                    error += dx;
                }
            }
            yield break;
        }
    
        static void Main(string[] args)
        {
            List<Point> points = GetPointsOnLine(0, 10, 30, 30).ToList();

        }
    }