SO3Engine/SO3Utils/SO3UniversalClock.cpp

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/*
-----------------------------------------------------------------------------
This source file is part of OpenSpace3D
For the latest info, see http://www.openspace3d.com

Copyright (c) 2010 I-maginer

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

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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt

You may alternatively use this source under the terms of a specific version of
the OpenSpace3D Unrestricted License provided you have obtained such a license from
I-maginer.
-----------------------------------------------------------------------------
*/

/*
Taken from Caelum (http://www.ogre3d.org/wiki/index.php/Caelum)
*/

#include "SO3UniversalClock.h"
#include "SO3Astronomy.h"

namespace SO3
{

const double SUniversalClock::SECONDS_PER_DAY = 86400.0;

SUniversalClock::SUniversalClock() 
{
  SetJulianDay(SAstronomy::J2000);        
  SetTimeScale(1.0);
}

void SUniversalClock::SetGregorianDateTime(int year, int month, int day, int hour, int minute, double second)
{
  ScopedHighPrecissionFloatSwitch precissionSwitch;
  SetJulianDay(SAstronomy::GetJulianDayFromGregorianDateTime(year, month, day, hour, minute, second));
}

void SUniversalClock::GetGregorianDateTime(int& year, int& month, int& day, int& hour, int& minute, double& second)
{
  ScopedHighPrecissionFloatSwitch precissionSwitch;
  SAstronomy::GetGregorianDateTimeFromJulianDay(GetJulianDay(), year, month, day, hour, minute, second);
}

void SUniversalClock::SetJulianDay(double value)
{
  mJulianDayBase = value;
  mCurrentTime = 0;
  mLastUpdateTime = 0;
}

double SUniversalClock::GetJulianDay() const
{
  ScopedHighPrecissionFloatSwitch precissionSwitch;
  double res = mJulianDayBase + mCurrentTime / SECONDS_PER_DAY;
  return res;
}

double SUniversalClock::GetJulianDayDifference() const
{
  ScopedHighPrecissionFloatSwitch precissionSwitch;
  return (mCurrentTime - mLastUpdateTime) / SECONDS_PER_DAY;
}

double SUniversalClock::GetJulianSecond() const
{
  ScopedHighPrecissionFloatSwitch precissionSwitch;
  double res = mJulianDayBase * SECONDS_PER_DAY + mCurrentTime;
  return res;
}

double SUniversalClock::GetJulianSecondDifference() const
{
  ScopedHighPrecissionFloatSwitch precissionSwitch;
  return mCurrentTime - mLastUpdateTime;
}

void SUniversalClock::SetTimeScale(const float scale)
{
  mTimeScale = scale;
}

Ogre::Real SUniversalClock::GetTimeScale() const
{
  return mTimeScale;
}

void SUniversalClock::Update(const float time)
{
  mLastUpdateTime = mCurrentTime;
  mCurrentTime += time * mTimeScale;
}

}

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