/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 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>
*/
#include "ns3/simulator.h"
#include <algorithm>
#include <cmath>
#include "random-direction-2d-mobility-model.h"
#include "ns3/log.h"
NS_LOG_COMPONENT_DEFINE ("RandomDirection2dMobilityModel");
namespace ns3 {
const double RandomDirection2dMobilityModel::PI = 3.14159265358979323846;
NS_OBJECT_ENSURE_REGISTERED (RandomDirection2dMobilityModel);
TypeId
RandomDirection2dMobilityModel::GetTypeId (void)
{
static TypeId tid = TypeId ("ns3::RandomDirection2dMobilityModel")
.SetParent<MobilityModel> ()
.SetGroupName ("Mobility")
.AddConstructor<RandomDirection2dMobilityModel> ()
.AddAttribute ("Bounds", "The 2d bounding area",
RectangleValue (Rectangle (-100, 100, -100, 100)),
MakeRectangleAccessor (&RandomDirection2dMobilityModel::m_bounds),
MakeRectangleChecker ())
.AddAttribute ("Speed", "A random variable to control the speed (m/s).",
RandomVariableValue (UniformVariable (1.0, 2.0)),
MakeRandomVariableAccessor (&RandomDirection2dMobilityModel::m_speed),
MakeRandomVariableChecker ())
.AddAttribute ("Pause", "A random variable to control the pause (s).",
RandomVariableValue (ConstantVariable (2.0)),
MakeRandomVariableAccessor (&RandomDirection2dMobilityModel::m_pause),
MakeRandomVariableChecker ())
;
return tid;
}
RandomDirection2dMobilityModel::RandomDirection2dMobilityModel ()
{
m_event = Simulator::ScheduleNow (&RandomDirection2dMobilityModel::Start, this);
}
void
RandomDirection2dMobilityModel::DoDispose (void)
{
// chain up.
MobilityModel::DoDispose ();
}
void
RandomDirection2dMobilityModel::Start (void)
{
double direction = UniformVariable().GetValue (0, 2 * PI);
SetDirectionAndSpeed (direction);
}
void
RandomDirection2dMobilityModel::BeginPause (void)
{
m_helper.Update ();
m_helper.Pause ();
Time pause = Seconds (m_pause.GetValue ());
m_event = Simulator::Schedule (pause, &RandomDirection2dMobilityModel::ResetDirectionAndSpeed, this);
NotifyCourseChange ();
}
void
RandomDirection2dMobilityModel::SetDirectionAndSpeed (double direction)
{
NS_LOG_FUNCTION_NOARGS ();
m_helper.UpdateWithBounds (m_bounds);
Vector position = m_helper.GetCurrentPosition ();
double speed = m_speed.GetValue ();
const Vector vector (std::cos (direction) * speed,
std::sin (direction) * speed,
0.0);
m_helper.SetVelocity (vector);
m_helper.Unpause ();
Vector next = m_bounds.CalculateIntersection (position, vector);
Time delay = Seconds (CalculateDistance (position, next) / speed);
m_event = Simulator::Schedule (delay,
&RandomDirection2dMobilityModel::BeginPause, this);
NotifyCourseChange ();
}
void
RandomDirection2dMobilityModel::ResetDirectionAndSpeed (void)
{
double direction = UniformVariable().GetValue (0, PI);
m_helper.UpdateWithBounds (m_bounds);
Vector position = m_helper.GetCurrentPosition ();
switch (m_bounds.GetClosestSide (position))
{
case Rectangle::RIGHT:
direction += PI / 2;
break;
case Rectangle::LEFT:
direction += - PI / 2;
break;
case Rectangle::TOP:
direction += PI;
break;
case Rectangle::BOTTOM:
direction += 0.0;
break;
}
SetDirectionAndSpeed (direction);
}
Vector
RandomDirection2dMobilityModel::DoGetPosition (void) const
{
m_helper.UpdateWithBounds (m_bounds);
return m_helper.GetCurrentPosition ();
}
void
RandomDirection2dMobilityModel::DoSetPosition (const Vector &position)
{
m_helper.SetPosition (position);
Simulator::Remove (m_event);
m_event = Simulator::ScheduleNow (&RandomDirection2dMobilityModel::Start, this);
}
Vector
RandomDirection2dMobilityModel::DoGetVelocity (void) const
{
return m_helper.GetVelocity ();
}
} // namespace ns3