timer.cpp

#include "prelude.h"

#ifdef _WIN32
#include <sys/timeb.h>
#include <sys/types.h>
void gettimeofday(struct timeval* t, void* timezone)
{
	struct _timeb timebuffer;
	_ftime(&timebuffer);
	t->tv_sec = timebuffer.time;
	t->tv_usec = 1000 * timebuffer.millitm;
}
#else
#include <sys/time.h>
#endif

Timer::Timer() { start(); }
Timer::~Timer() {}

inline double timeDiff(const timeval &t0, const timeval &t1)
{
	double ms = (t1.tv_sec - t0.tv_sec) * 1000.0
		+ (t1.tv_usec - t0.tv_usec) / 1000.0;
	return ms;
}

void Timer::start()
{
	gettimeofday(&init, NULL);
	prev = init;
	last_lap_duration = ellapsed_time_duration = 0.0;
	isRunning = true;
}

// returns lap time in milliseconds
double Timer::lap()
{
	if (!isRunning)
		return 0.0;

	timeval now;
	gettimeofday(&now, NULL);

	last_lap_duration = timeDiff(prev, now);
	return last_lap_duration;
}

// returns total ellapsed time in milliseconds
double Timer::stop()
{
	if (!isRunning)
		return 0.0;

	timeval now;
	gettimeofday(&now, NULL);

	last_lap_duration = timeDiff(prev, now);
	ellapsed_time_duration = timeDiff(init, now);

	isRunning = false;
	return ellapsed_time_duration;
}

// re-retrieve values
double Timer::lastLap() const
{
	return last_lap_duration;
}

double Timer::ellapsed() const
{
	return ellapsed_time_duration;
}