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20 jrf 1 
#ifndef TIMER_H
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#define TIMER_H
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#include <ctime>
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class Timer
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{
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 public:
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  Timer() : t1(0), t2(0) { }
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  void start()
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  {
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    t1 = std::clock();
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  }
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  double split()
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  {
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    return (std::clock() - t1) / static_cast<double>(CLOCKS_PER_SEC);
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  }
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  void stop()
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  {
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    t2 = std::clock();
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  }
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  double get_time()
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  {
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    return (t2 - t1) / static_cast<double>(CLOCKS_PER_SEC);
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  }
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 private:
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  int t1;
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  int t2;
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};
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class FrameRateTimer : public Timer
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{
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 public:
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  FrameRateTimer(int avg = 40) : average(avg), fps(0.0) { }
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  void set_average(int avg)
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  {
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    average = avg;
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  }
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  double get_fps()
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  {
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    one_frame();
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    return fps;
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  }
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 private:
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  int average;
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  double fps;
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  void one_frame()
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  {
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    static int i = 0;
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    if(i >= average)
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    {
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      stop();
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      fps = average / get_time();
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      i = 0;
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    }
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    if(i == 0)
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      start();
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    i++;
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  }
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};
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#endif