constant-velocity-helper.h

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/*
 * Copyright (c) 2006,2007 INRIA
 *
 * 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */
#ifndef CONSTANT_VELOCITY_HELPER_H
#define CONSTANT_VELOCITY_HELPER_H
 
#include "box.h"
 
#include "ns3/nstime.h"
#include "ns3/vector.h"
 
namespace ns3
{
 
class Rectangle;
 
/**
 * \ingroup mobility
 *
 * \brief Utility class used to move node with constant velocity.
 */
class ConstantVelocityHelper
{
  public:
    ConstantVelocityHelper();
    /**
     * Create object and set position
     * \param position the position vector
     */
    ConstantVelocityHelper(const Vector& position);
    /**
     * Create object and set position and velocity
     * \param position the position vector
     * \param vel the velocity vector
     */
    ConstantVelocityHelper(const Vector& position, const Vector& vel);
 
    /**
     * Set position vector
     * \param position Position vector
     */
    void SetPosition(const Vector& position);
    /**
     * Get current position vector
     * \return Position vector
     */
    Vector GetCurrentPosition() const;
    /**
     * Get velocity; if paused, will return a zero vector
     * \return Velocity vector
     */
    Vector GetVelocity() const;
    /**
     * Set new velocity vector
     * \param vel Velocity vector
     */
    void SetVelocity(const Vector& vel);
    /**
     * Pause mobility at current position
     */
    void Pause();
    /**
     * Resume mobility from current position at current velocity
     */
    void Unpause();
 
    /**
     * Update position, if not paused, from last position and time of last update
     * \param rectangle 2D bounding rectangle for resulting position; object will not move outside
     * the rectangle
     */
    void UpdateWithBounds(const Rectangle& rectangle) const;
    /**
     * Update position, if not paused, from last position and time of last update
     * \param bounds 3D bounding box for resulting position; object will not move outside the box
     */
    void UpdateWithBounds(const Box& bounds) const;
    /**
     * Update position, if not paused, from last position and time of last update
     */
    void Update() const;
 
  private:
    mutable Time m_lastUpdate; //!< time of last update
    mutable Vector m_position; //!< state variable for current position
    Vector m_velocity;         //!< state variable for velocity
    bool m_paused;             //!< state variable for paused
};
 
} // namespace ns3
 
#endif /* CONSTANT_VELOCITY_HELPER_H */