unit Chronometer;
(* ***** BEGIN LICENSE BLOCK *****
 * Copyright (C) 2004 Durand Emmanuel
 * Copyright (C) 2004 Burgel Eric
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Contact :
 *   filters@edurand.com
 *   filters@burgel.com
 *
 * ***** END LICENSE BLOCK ***** *)

{
 edurand (filters@edurand.com)
 eburgel (filters@burgel.com)
}

interface
uses
  Windows, Math;

type
  TChronometer = class
  public
    constructor Create;
    procedure Start;
    function Stop : Integer;
    function getTime() : int64;
  private
    counterStart,counterStop,freq : int64;
    t : Extended;
  end;

implementation

constructor TChronometer.Create;
begin
  QueryPerformanceFrequency(freq);
  t:=0;
end;

procedure TChronometer.Start;
begin
  QueryPerformanceCounter(counterStart);
end;

function TChronometer.Stop : Integer;
var
  countTime : Integer;
begin
  QueryPerformanceCounter(counterStop);
  countTime:=counterStop-counterStart;
  t:=countTime / freq*1000;
  Result:=Floor(t);
end;

function TChronometer.getTime() : int64;
begin
  Result:=Floor(t);
end;

end.