/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * 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

 *

 * Author: Gustavo Carneiro  <gjc@inescporto.pt>

 */

#include "constant-acceleration-mobility-model.h"

#include "ns3/simulator.h"

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (ConstantAccelerationMobilityModel);

TypeId ConstantAccelerationMobilityModel::GetTypeId (void)

{

  static TypeId tid = TypeId ("ns3::ConstantAccelerationMobilityModel")

    .SetParent<MobilityModel> ()

    .AddConstructor<ConstantAccelerationMobilityModel> ();

  return tid;

}

ConstantAccelerationMobilityModel::ConstantAccelerationMobilityModel ()

{}

ConstantAccelerationMobilityModel::~ConstantAccelerationMobilityModel ()

{}

inline Vector

ConstantAccelerationMobilityModel::DoGetVelocity (void) const

{

  double t = (Simulator::Now () - m_baseTime).GetSeconds ();

  return Vector (m_baseVelocity.x + m_acceleration.x*t,

                 m_baseVelocity.y + m_acceleration.y*t,

                 m_baseVelocity.z + m_acceleration.z*t);

}

inline Vector

ConstantAccelerationMobilityModel::DoGetPosition (void) const

{

  double t = (Simulator::Now () - m_baseTime).GetSeconds ();

  double half_t_square = t*t*0.5;

  return Vector (m_basePosition.x + m_baseVelocity.x*t + m_acceleration.x*half_t_square,

                 m_basePosition.y + m_baseVelocity.y*t + m_acceleration.y*half_t_square,

                 m_basePosition.z + m_baseVelocity.z*t + m_acceleration.z*half_t_square);

}

void 

ConstantAccelerationMobilityModel::DoSetPosition (const Vector &position)

{

  m_baseVelocity = DoGetVelocity ();

  m_baseTime = Simulator::Now ();

  m_basePosition = position;

  NotifyCourseChange ();

}

void 

ConstantAccelerationMobilityModel::SetVelocityAndAcceleration (const Vector &velocity,

                                                               const Vector &acceleration)

{

  m_basePosition = DoGetPosition ();

  m_baseTime = Simulator::Now ();

  m_baseVelocity = velocity;

  m_acceleration = acceleration;

  NotifyCourseChange ();

}

}; // namespace ns3

/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * 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

 *

 * Author: Gustavo Carneiro  <gjc@inescporto.pt>

 */

#ifndef CONSTANT_ACCELERATION_MOBILITY_MODEL_H

#define CONSTANT_ACCELERATION_MOBILITY_MODEL_H

#include "mobility-model.h"

#include "ns3/nstime.h"

namespace ns3 {

/**

 * \brief a position model for which the current acceleration does not

 *        change once it has been set and until it is set again 

 *        explicitely to a new value.

 */

class ConstantAccelerationMobilityModel : public MobilityModel 

{

public:

  static TypeId GetTypeId (void);

  /**

   * Create position located at coordinates (0,0,0) with

   * speed (0,0,0).

   */

  ConstantAccelerationMobilityModel ();

  virtual ~ConstantAccelerationMobilityModel ();

  void SetVelocityAndAcceleration (const Vector &velocity, const Vector &acceleration);

private:

  virtual Vector DoGetPosition (void) const;

  virtual void DoSetPosition (const Vector &position);

  virtual Vector DoGetVelocity (void) const;

  Time m_baseTime;

  Vector m_basePosition;

  Vector m_baseVelocity;

  Vector m_acceleration;

};

}; // namespace ns3

#endif /* CONSTANT_ACCELERATION_MOBILITY_MODEL_H */

        'constant-acceleration-mobility-model.cc',

        'constant-acceleration-mobility-model.h',