/*
Danger from the Deep - Open source submarine simulation
Copyright (C) 2003-2006  Thorsten Jordan, Luis Barrancos and others.

This program 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 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 General Public License for more details.

You should have received a copy of the GNU 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
*/

// (physics) physics formulas
// subsim (C)+(W) SEE LICENSE

#ifndef PHYSICSMGR_H
#define PHYSICSMGR_H

/*  
	This class contains all physics transformations used in position
	calculations, balistics, buoyance, etc.
*/

#include "error.h"
#include "vector3.h"
#include <vector>

#define GRAVITY 9.80665 // m/s2, global constant. *MUST BE A DEFINE FOR EASE OF USE*

///\brief contains all math transformations
class math
{
public:
	// Floating-Point
	static const double DELTA; // For IS_ZERO
	static bool IS_ZERO (double value);

	// Statistics
	static double average (std::vector<double>& values);
	static double weighted_average (std::vector<double>& values, std::vector<double>& weights);
};

///\brief contains all physics transformations
class physics
{
public:
	// Motion
	static void new_position(vector3& position, vector3& velocity, vector3& acceleration, double delta);
	static void new_velocity(vector3& velocity, vector3& acceleration, double delta);

	// Forces
	static vector3 net_force(std::vector<vector3>& forces);

	// Densities
	static double net_density (std::vector<double>& density, std::vector<double>& occupacy);
};

#endif