timer.hpp

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/* Copyright 2008 Renato Florentino Garcia <fgar.renato@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2, as
 * published by the Free Software Foundation.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef TIMER_HPP
#define TIMER_HPP

#include <sys/timeb.h>
#include <time.h>

#define TIMEB timeb
#define FTIME ftime

class EpuckTimer
{
public:

  EpuckTimer()
    :intervalRunning(false)
  {}

  double initialize(double startTime=0.0)
  {
    this->offset = startTime;

    FTIME(&t);
    t0 = (double)(t.time + t.millitm/1000.0);
    return t0;
  }

  double elapsedTime()
  {
    currentTime();
    return(t2-t0 + offset);
  }

  void resetInterval()
  {
    intervalRunning = true;
    FTIME(&t);
    t1 = (double)(t.time + t.millitm/1000.0);
  }

  double intervalDelay()
  {
    if(intervalRunning == false)
    {
      return 0;
    }
    FTIME(&t);
    t2 = (double)(t.time + t.millitm/1000.0);
    return t2-t1;
  }

private:

  // Offset that will be added at current delta time from start instant.
  double offset;
  struct TIMEB t;
  double t0, t1, t2;
  bool intervalRunning;

  // return The elapsed time since 00:00:00 UTC, in seconds.
  double currentTime()
  {
    FTIME(&t);
    t2 = (double)(t.time + t.millitm/1000.0);
    return t2;
  }

};


#endif