/** \file physics.cpp
 * Snowballs trajectory computation
 *
 * $Id: physics.cpp,v 1.1 2001-07-24 17:00:47 valignat Exp $
 */

/* Copyright, 2001 Nevrax Ltd.
 *
 * This file is part of NEVRAX SNOWBALLS.
 * NEVRAX SNOWBALLS is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.

 * NEVRAX SNOWBALLS 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
 * General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with NEVRAX SNOWBALLS; see the file COPYING. If not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

//
// Includes
//

#include "physics.h"

//
// Namespaces
//

using namespace std;
using namespace NLMISC;

CVector	CTrajectory::eval(NLMISC::TTime t) const
{
	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::TTime t) const
{
	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;
}