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//  Fuel_Tank.h - a particle that holds fuel for the engine.
//  Copyright (C) 2002 Sam Varner
//  This file is part of Vamos Automotive Simulator.
//  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
//  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

#ifndef _FUEL_TANK_H_
#define _FUEL_TANK_H_

#include <vamos/body/Particle.h>
#include <vamos/geometry/Three_Vector.h>

namespace Vamos_Body
  //* A fuel tank particle.
  class Fuel_Tank : public Particle
      // The capacity of the tank.
      double m_capacity;

      // The remaining volume of fuel.
      double m_volume;

      // The denisty of the fuel.
      double m_density;

      // update_mass () is called to re-calculate the mass of fuel
      // remaining. 
      void update_mass () { m_mass = m_density * m_volume; }

      //** Constructor
      Fuel_Tank (const Vamos_Geometry::Three_Vector& position,
                     double capacity,
                     double volume,
                     double density);

      // Put fuel in the tank.  With the default VOLUME of -1.0, the
      // tank is filled to capacity.  With any other negative VOLUME, or
      // zero, the tank is emptied, i.e. the volume is set to zero.
      void fill (double volume = -1.0);

      // Decrease the volume of fuel by AMMOUNT.  The volume remaining
      // is returned.
      double consume (double amount);

      // Return the volume of fuel remaining.
      double fuel () const { return m_volume; }
      double fuelpercent() const {return m_volume / m_capacity;}

      // Return true if the tank is empty, false otherwise.
      bool empty () const { return m_volume == 0.0; }

#endif // !_FUEL_TANK_H_

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