ryzom-core/snowballs2/client/src/physics.cpp

// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
// Copyright (C) 2010  Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

//
// Includes
//

#include <nel/misc/types_nl.h>

#include "physics.h"

//
// Namespaces
//

using namespace std;
using namespace NLMISC;

namespace SBCLIENT {

// -- -- this file exists twice

CVector	CTrajectory::eval(NLMISC::TLocalTime t) const
{
	if (t < _StartTime) return _StartPosition;

	float	ft = (float)(t-_StartTime)/(float)(_StopTime-_StartTime);
	ft = min(ft, 1.0f);
	CVector	res = _EndPosition*ft + _StartPosition*(1.0f-ft);
	res.z += 0.3f*_Distance*_Distance/90.0f*(float)sin(Pi*ft);
	return res;
}

CVector	CTrajectory::evalSpeed(NLMISC::TLocalTime t) const
{
	if (t < _StartTime) return _StartPosition;

	float	ft = (float)(t-_StartTime)/(float)(_StopTime-_StartTime);
	ft = min(ft, 1.0f);
	CVector res = (_EndPosition-_StartPosition).normed()*_Speed;
	res.z += 0.3f*_Distance*_Distance/90.0f*(float)Pi*(float)cos(Pi*ft);
	return res;
}

} /* namespace SBCLIENT */

/* end of file */