using System;

 using System.Collections.Generic;

 using System.Text;

 using System.Runtime.InteropServices;

 using System.Diagnostics.CodeAnalysis;

 namespace Aga.Controls

 {

 	/// <summary>

 	/// High resolution timer, used to test performance

 	/// </summary>

 	public static class TimeCounter

 	{

 		private static Int64 _start;

 		/// <summary>

 		/// Start time counting

 		/// </summary>

 		public static void Start()

 		{

 			_start = 0;

 			QueryPerformanceCounter(ref _start);

 		}

 		public static Int64 GetStartValue()

 		{

 			Int64 t = 0;

 			QueryPerformanceCounter(ref t);

 			return t;

 		}

 		/// <summary>

 		/// Finish time counting

 		/// </summary>

 		/// <returns>time in seconds elapsed from Start till Finish	</returns>

 		public static double Finish()

 		{

 			return Finish(_start);

 		}

 		public static double Finish(Int64 start)

 		{

 			Int64 finish = 0;

 			QueryPerformanceCounter(ref finish);

 			Int64 freq = 0;

 			QueryPerformanceFrequency(ref freq);

 			return (finish - start) / (double)freq;

 		}

 		[DllImport("Kernel32.dll")]

 		[return: MarshalAs(UnmanagedType.Bool)]

 		static extern bool QueryPerformanceCounter(ref Int64 performanceCount);

 		[DllImport("Kernel32.dll")]

 		[return: MarshalAs(UnmanagedType.Bool)]

 		static extern bool QueryPerformanceFrequency(ref Int64 frequency);

 	}

 }