src/libprojectM/TimeKeeper.cpp

#ifndef WIN32
#include <sys/time.h>
#else
#endif /** !WIN32 */
#include <stdlib.h>

#include "TimeKeeper.hpp"
#include "RandomNumberGenerators.hpp"


TimeKeeper::TimeKeeper (double presetDuration, double smoothDuration, double easterEgg)
{
  _smoothDuration = smoothDuration;
  _presetDuration = presetDuration;
  _easterEgg = easterEgg;

#ifndef WIN32
  gettimeofday ( &this->startTime, NULL );
#else
  startTime = GetTickCount();
#endif /** !WIN32 */

  UpdateTimers();
}

void
TimeKeeper::UpdateTimers()
{
#ifndef WIN32
  _currentTime = getTicks (&startTime) * 0.001;
#else
  _currentTime = getTicks (startTime) * 0.001;
#endif /** !WIN32 */

  _presetFrameA++;
  _presetFrameB++;
}

void
TimeKeeper::StartPreset()
{
  _isSmoothing = false;
  _presetTimeA = _currentTime;
  _presetFrameA = 1;
  _presetDurationA = sampledPresetDuration();
}

void
TimeKeeper::StartSmoothing()
{
  _isSmoothing = true;
  _presetTimeB = _currentTime;
  _presetFrameB = 1;
  _presetDurationB = sampledPresetDuration();
}

void
TimeKeeper::EndSmoothing()
{
  _isSmoothing = false;
  _presetTimeA = _presetTimeB;
  _presetFrameA = _presetFrameB;
  _presetDurationA = _presetDurationB;
}

bool
TimeKeeper::CanHardCut()
{
  return ((_currentTime - _presetTimeA) > HARD_CUT_DELAY);
}

double
TimeKeeper::SmoothRatio()
{
  return (_currentTime - _presetTimeB) / _smoothDuration;
}

bool
TimeKeeper::IsSmoothing()
{
  return _isSmoothing;
}

double
TimeKeeper::GetRunningTime()
{
  return _currentTime;
}

double
TimeKeeper::PresetProgressA()
{
  if (_isSmoothing) return 1.0;
  else              return (_currentTime - _presetTimeA) / _presetDurationA;
}

double
TimeKeeper::PresetProgressB()
{
  return (_currentTime - _presetTimeB) / _presetDurationB;
}

int
TimeKeeper::PresetFrameB()
{
  return _presetFrameB;
}

int
TimeKeeper::PresetFrameA()
{
  return _presetFrameA;
}

double
TimeKeeper::sampledPresetDuration()
{
#ifdef WIN32
  return  _presetDuration;
#else
  return fmax (1, fmin (60, RandomNumberGenerators::gaussian (_presetDuration,
                                                              _easterEgg)));
#endif
}