ticktimer.h

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/***************************************************************************
                  ticktimer.h  -  Simple ms-based timing class
                             -------------------
    begin                : Thu Mar 6 2003
    copyright            : (C) 2003 by Tyler Montbriand
    email                : tsm@accesscomm.ca
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef TICKTIMER_H
#define TICKTIMER_H

#include <SDL/SDL_timer.h>



class TickTimer
{
public:
  inline TickTimer()
  { Reset(); }

  inline void Reset()
  {  lasttick=GetCurTime();  }

  inline Sint32 Left(Sint32 time)
  {
    int t=Ticks();
    /* Can't wait backwards */
    if(time<0)      return(0);
    else if(t>time) return(0);
    else            return(t-time);
  }

  inline Sint32 Ticks()
  { return(GetCurTime()-lasttick);  }

  inline operator Sint32()
  { return(Ticks());  }
  
  inline TickTimer &operator -=(Sint32 offset)
  {
    lasttick+=offset;
    return(*this);
  }
  
protected:
  virtual Sint32 GetCurTime()
  { return(SDL_GetTicks());  }
  
  Sint32 lasttick;
};

class ManualTimer:public TickTimer
{
public:
  ManualTimer():TickTimer()
  {
    lasttick=0;
    curtime=0;        
  }

  inline void Advance(Sint32 tick)
  { if(tick>0)  curtime+=tick;  }
  
protected:
  virtual Sint32 GetCurTime()
  { return curtime; }
  Sint32 curtime;  
};


#endif

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