1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3 * Copyright (c) 2006,2007 INRIA
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation;
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
19 */
20 #include "random-walk-2d-mobility-model.h"
21 #include "ns3/enum.h"
22 #include "ns3/double.h"
23 #include "ns3/string.h"
24 #include "ns3/pointer.h"
25 #include "ns3/simulator.h"
26 #include "ns3/log.h"
27 #include <cmath>
28
29 namespace ns3 {
30
31 NS_LOG_COMPONENT_DEFINE ("RandomWalk2d");
32
33 NS_OBJECT_ENSURE_REGISTERED (RandomWalk2dMobilityModel);
34
35 TypeId
GetTypeId(void)36 RandomWalk2dMobilityModel::GetTypeId (void)
37 {
38 static TypeId tid = TypeId ("ns3::RandomWalk2dMobilityModel")
39 .SetParent<MobilityModel> ()
40 .SetGroupName ("Mobility")
41 .AddConstructor<RandomWalk2dMobilityModel> ()
42 .AddAttribute ("Bounds",
43 "Bounds of the area to cruise.",
44 RectangleValue (Rectangle (0.0, 100.0, 0.0, 100.0)),
45 MakeRectangleAccessor (&RandomWalk2dMobilityModel::m_bounds),
46 MakeRectangleChecker ())
47 .AddAttribute ("Time",
48 "Change current direction and speed after moving for this delay.",
49 TimeValue (Seconds (1.0)),
50 MakeTimeAccessor (&RandomWalk2dMobilityModel::m_modeTime),
51 MakeTimeChecker ())
52 .AddAttribute ("Distance",
53 "Change current direction and speed after moving for this distance.",
54 DoubleValue (1.0),
55 MakeDoubleAccessor (&RandomWalk2dMobilityModel::m_modeDistance),
56 MakeDoubleChecker<double> ())
57 .AddAttribute ("Mode",
58 "The mode indicates the condition used to "
59 "change the current speed and direction",
60 EnumValue (RandomWalk2dMobilityModel::MODE_DISTANCE),
61 MakeEnumAccessor (&RandomWalk2dMobilityModel::m_mode),
62 MakeEnumChecker (RandomWalk2dMobilityModel::MODE_DISTANCE, "Distance",
63 RandomWalk2dMobilityModel::MODE_TIME, "Time"))
64 .AddAttribute ("Direction",
65 "A random variable used to pick the direction (radians).",
66 StringValue ("ns3::UniformRandomVariable[Min=0.0|Max=6.283184]"),
67 MakePointerAccessor (&RandomWalk2dMobilityModel::m_direction),
68 MakePointerChecker<RandomVariableStream> ())
69 .AddAttribute ("Speed",
70 "A random variable used to pick the speed (m/s).",
71 StringValue ("ns3::UniformRandomVariable[Min=2.0|Max=4.0]"),
72 MakePointerAccessor (&RandomWalk2dMobilityModel::m_speed),
73 MakePointerChecker<RandomVariableStream> ());
74 return tid;
75 }
76
77 void
DoInitialize(void)78 RandomWalk2dMobilityModel::DoInitialize (void)
79 {
80 DoInitializePrivate ();
81 MobilityModel::DoInitialize ();
82 }
83
84 void
DoInitializePrivate(void)85 RandomWalk2dMobilityModel::DoInitializePrivate (void)
86 {
87 m_helper.Update ();
88 double speed = m_speed->GetValue ();
89 double direction = m_direction->GetValue ();
90 Vector vector (std::cos (direction) * speed,
91 std::sin (direction) * speed,
92 0.0);
93 m_helper.SetVelocity (vector);
94 m_helper.Unpause ();
95
96 Time delayLeft;
97 if (m_mode == RandomWalk2dMobilityModel::MODE_TIME)
98 {
99 delayLeft = m_modeTime;
100 }
101 else
102 {
103 delayLeft = Seconds (m_modeDistance / speed);
104 }
105 DoWalk (delayLeft);
106 }
107
108 void
DoWalk(Time delayLeft)109 RandomWalk2dMobilityModel::DoWalk (Time delayLeft)
110 {
111 Vector position = m_helper.GetCurrentPosition ();
112 Vector speed = m_helper.GetVelocity ();
113 Vector nextPosition = position;
114 nextPosition.x += speed.x * delayLeft.GetSeconds ();
115 nextPosition.y += speed.y * delayLeft.GetSeconds ();
116 m_event.Cancel ();
117 if (m_bounds.IsInside (nextPosition))
118 {
119 m_event = Simulator::Schedule (delayLeft, &RandomWalk2dMobilityModel::DoInitializePrivate, this);
120 }
121 else
122 {
123 nextPosition = m_bounds.CalculateIntersection (position, speed);
124 Time delay = Seconds ((nextPosition.x - position.x) / speed.x);
125 m_event = Simulator::Schedule (delay, &RandomWalk2dMobilityModel::Rebound, this,
126 delayLeft - delay);
127 }
128 NotifyCourseChange ();
129 }
130
131 void
Rebound(Time delayLeft)132 RandomWalk2dMobilityModel::Rebound (Time delayLeft)
133 {
134 m_helper.UpdateWithBounds (m_bounds);
135 Vector position = m_helper.GetCurrentPosition ();
136 Vector speed = m_helper.GetVelocity ();
137 switch (m_bounds.GetClosestSide (position))
138 {
139 case Rectangle::RIGHT:
140 case Rectangle::LEFT:
141 speed.x = -speed.x;
142 break;
143 case Rectangle::TOP:
144 case Rectangle::BOTTOM:
145 speed.y = -speed.y;
146 break;
147 }
148 m_helper.SetVelocity (speed);
149 m_helper.Unpause ();
150 DoWalk (delayLeft);
151 }
152
153 void
DoDispose(void)154 RandomWalk2dMobilityModel::DoDispose (void)
155 {
156 // chain up
157 MobilityModel::DoDispose ();
158 }
159 Vector
DoGetPosition(void) const160 RandomWalk2dMobilityModel::DoGetPosition (void) const
161 {
162 m_helper.UpdateWithBounds (m_bounds);
163 return m_helper.GetCurrentPosition ();
164 }
165 void
DoSetPosition(const Vector & position)166 RandomWalk2dMobilityModel::DoSetPosition (const Vector &position)
167 {
168 NS_ASSERT (m_bounds.IsInside (position));
169 m_helper.SetPosition (position);
170 m_event.Cancel ();
171 m_event = Simulator::ScheduleNow (&RandomWalk2dMobilityModel::DoInitializePrivate, this);
172 }
173 Vector
DoGetVelocity(void) const174 RandomWalk2dMobilityModel::DoGetVelocity (void) const
175 {
176 return m_helper.GetVelocity ();
177 }
178 int64_t
DoAssignStreams(int64_t stream)179 RandomWalk2dMobilityModel::DoAssignStreams (int64_t stream)
180 {
181 m_speed->SetStream (stream);
182 m_direction->SetStream (stream + 1);
183 return 2;
184 }
185
186
187 } // namespace ns3
188