How to set node position in NetAnim? I always get Use SetConstantPosition if it is stationary error - ns-3

Question

I am new to ns-3. I am trying to understand from the very basic. I created a network simulation containing two switches, then I want to visualize it using NetAnim.
Followings are my code
/* -*- 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
*/
#include "ns3/core-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/network-module.h"
#include "ns3/applications-module.h"
#include "ns3/mobility-module.h"
#include "ns3/csma-module.h"
#include "ns3/internet-module.h"
#include "ns3/yans-wifi-helper.h"
#include "ns3/ssid.h"
#include "ns3/netanim-module.h"
#include "stdio.h"
using namespace ns3;
NS_LOG_COMPONENT_DEFINE ("HMTMRSim");
int
main (int argc, char *argv[])
{
std::cout << "create switches" << std::endl;
NodeContainer switches;
switches.Create(2); // create two switches
AnimationInterface anim("myanim.xml");
std::cout << "set position for switches" << std::endl;
anim.SetConstantPosition(switches.Get(0), 48.0, 70.0, 0);
anim.SetConstantPosition(switches.Get(1), 48.0, 90.0, 0);
anim.UpdateNodeDescription(0, "Main");
anim.UpdateNodeDescription(1, "Rack0");
anim.UpdateNodeSize(0, 10, 10);
anim.UpdateNodeColor(0, 0, 0, 255);
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
When I run it, it works without problem, but I get this warning
Waf: Leaving directory `/Users/arwankhoiruddin/Downloads/ns-allinone-3.30.1/ns-3.30.1/build'
Build commands will be stored in build/compile_commands.json
'build' finished successfully (18.508s)
create switches
AnimationInterface WARNING:Node:0 Does not have a mobility model. Use SetConstantPosition if it is stationary
AnimationInterface WARNING:Node:1 Does not have a mobility model. Use SetConstantPosition if it is stationary
AnimationInterface WARNING:Node:0 Does not have a mobility model. Use SetConstantPosition if it is stationary
AnimationInterface WARNING:Node:
When I open in NetAnim (shown in the picture below), it seems to ignore the position that I defined in my code. As you see in the following properties, the first node (node 0) has position of (x,y) = (81.00, 83.00).
I am aware that I can change the position by changing the value in properties, but later using ns-3, I want to create quite a complex network, so it will be difficult to set them manually.
In internet, I found this suggestion, i.e. adding mobility to replace the SetConstantPosition. However, the result in NetAnim is still similar.
MobilityHelper mobility;
Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator>();
positionAlloc->Add(Vector(0.0, 0.0, 0.0));
positionAlloc->Add(Vector(5.0, 0.0, 0.0));
mobility.SetPositionAllocator(positionAlloc);
mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
mobility.Install(switches);
Please let me know how to set the position from my code and get rid of the warning.
Thank you for your kind helps

Answer 1

I posted the same question in NS3 Google Group. Few days later, I got a great answer from Liu XinXin (many thanks for the help - her StackOverflow account is xxliu95). Here's the code that she posted
int
main (int argc, char *argv[])
{
std::cout << "create switches" << std::endl;
NodeContainer switches;
switches.Create(2); // create two switches
MobilityHelper mobility;
mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
mobility.Install (switches);
AnimationInterface anim("myanim.xml");
std::cout << "set position for switches" << std::endl;
Ptr<ConstantPositionMobilityModel> s1 = switches.Get (0)->GetObject<ConstantPositionMobilityModel> ();
Ptr<ConstantPositionMobilityModel> s2 = switches.Get (1)->GetObject<ConstantPositionMobilityModel> ();
s1->SetPosition (Vector ( 48.0, 70.0, 0 ));
s2->SetPosition (Vector ( 48.0, 90.0, 0 ));
anim.UpdateNodeDescription(0, "Main");
anim.UpdateNodeDescription(1, "Rack0");
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
This is what I got in NetAnim