Bouncing text in .NET console using C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
namespace ConsoleApplication1
{
    class Program
    {
        static int ColorIndex = 0;
        static double sinAngle = 0;
        static int xx = 0;
        static int yy = 0;
        static int hsp = 0;
        static int vsp = 0;
        private static ConsoleColor getCol(int index)
        {
            ConsoleColor col = ConsoleColor.Black;
            switch(index){
                case 0: col = ConsoleColor.Red; break;
                case 1: col = ConsoleColor.Green; break;
                case 2: col = ConsoleColor.Magenta; break;
                case 3: col = ConsoleColor.Cyan; break;
                case 4: col = ConsoleColor.Yellow; break;
                case 5: col = ConsoleColor.DarkGreen; break;
                case 6: col = ConsoleColor.DarkBlue; break;
            }
            return col;

        }

        static void Main(string[] args)
        {
            String str = Console.ReadLine();
            int width = str.Length;

            Random rnd = new Random();
            hsp = rnd.Next(-2, 2);
            vsp = rnd.Next(-2, 2);
            xx = (int)((Console.WindowWidth / 2) - width / 2);
            yy  = (int)(Console.WindowHeight / 2);
            Console.Clear();
            while (true)
            {


                if (Console.KeyAvailable)
                {
                    if (Console.ReadKey().Key == ConsoleKey.Escape)
                    {
                        return;
                    }

                }

                if ((xx + width + hsp) >= Console.WindowWidth)
                {
                    hsp = -hsp;
                }
                if ((xx + hsp) <= 0)
                {
                    hsp = -hsp;
                }
                if ((yy + vsp) >= Console.WindowHeight - 1)
                {
                    vsp = -vsp;
                }
                if ((yy + vsp) <= 0)
                {
                    vsp = -vsp;
                }
                xx += hsp;
                yy += vsp;
                Thread.Sleep(50);
                ColorIndex = (ColorIndex + 1) % 6;
                Console.Clear();
                Console.ForegroundColor = getCol(ColorIndex);


                Console.SetCursorPosition(xx, yy);
                for (int i = 0; i < str.Length; i++)
                {
                    ColorIndex = (ColorIndex + 1) % 6;
                    Console.ForegroundColor = getCol(ColorIndex);
                    Console.Write(str.Substring(i, 1));
                }
                sinAngle += .1;
                Console.WriteLine();

            }
        }
    }
}