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Crossing.cpp

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 * This file is part of openWNS (open Wireless Network Simulator)
 * _____________________________________________________________________________
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 * Copyright (C) 2004-2007
 * Chair of Communication Networks (ComNets)
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 * fax: ++49-241-80-22242
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 * www: http://www.openwns.org
 * _____________________________________________________________________________
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 * openWNS is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 2 as published by the
 * Free Software Foundation;
 *
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 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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#include <sstream>

#include <RISE/scenario/mobility/roadmap/Crossing.hpp>
#include <RISE/scenario/mobility/roadmap/Map.hpp>
#include <RISE/scenario/mobility/Mobility.hpp>

#include <WNS/pyconfig/Sequence.hpp>
#include <WNS/distribution/Uniform.hpp>
#include <WNS/Assure.hpp>

using namespace rise::scenario::mobility::roadmap;
using namespace std;

matrix rise::scenario::mobility::roadmap::getMatrix(const wns::pyconfig::View& aView, const std::string& aName)
{
    matrix result;
    for (int i=0; i<aView.len(aName); ++i)
    {
        std::stringstream index;
        index << i;

        std::string subviewName = aName +
            std::string("[") + index.str() + std::string("]");

        std::vector<double> subVector;
        for (int j=0; j<aView.len(subviewName); ++j){
            subVector.push_back(aView.get<double>(subviewName,j));
        }
        result.push_back(subVector);
    }
    return result;
}

Crossing::Crossing(const wns::pyconfig::View& crossingView, Map* _map) :
    MapObject(crossingView.get<MapObject::ID>("ID"), _map),
    position(crossingView.getView("position")),
    connections(),
    probMatrix(getMatrix(crossingView,std::string("probMatrix"))),
    uniDis(NULL)
{
    // int connection list
    for (int i=0; i<crossingView.len("connections"); ++i)
        connections.push_back(crossingView.get<MapObject::ID>("connections",i));

    // check consistency of probability Matrix
    assure(probMatrix.size()==connections.size(), "Mismatch in connections and probability Matrix.");
    for (unsigned int i=0; i<probMatrix.size(); ++i)
        assure(probMatrix[i].size()==connections.size(), "Mismatch in connections and probability Matrix.");

    // init the distribution function to determine where to turn
    wns::rng::RNGen* rng = wns::simulator::getRegistry()->find<wns::rng::RNGen*>("MOBILITY-RNG");
    uniDis = new wns::distribution::StandardUniform(rng);
}

wns::Position Crossing::getNextPosition(MapUser* user, simTimeType dt) const
{
    // where do we come from?
    MapObject::ID from = user->currentObject;
    unsigned int index;
    // determine index of object we come from
    for (index=0 ; index<connections.size(); ++index)
        if (connections.at(index)==from) break;
    // store relevant probability vector handy
    std::vector<double> probVector = probMatrix.at(index);
    // Choose next connected Object
    double randomNumber = (*uniDis)();
    unsigned int j = 0;
    double aWeight = probVector.at(0);
    for ( ; j < probVector.size()-1; ++j)
    {
        if (randomNumber<aWeight)
            break;
        aWeight += probVector.at(j+1);
    }
    // now j should be the index of the next object.
    MapObject* next = this->map->getObject(connections.at(j));
    user->currentObject = this->id; // my own ID
    user->percent = 0.0; // entering a new street
    user->heading = Headings::Forward(); // the next street will re-set this
    // velocity remains unchanged

    MESSAGE_BEGIN(NORMAL, log, m, "MapUser arrived");
    m << " from street " << from 
      << " at Crossing " << id 
      << " continuing on street " << connections.at(j);
    MESSAGE_END();

    // delegate the final decision to the next street.
    return next->getNextPosition(user, dt);
}

#ifndef WNS_NDEBUG
wns::Position Crossing::getPosition(const MapUser* user) const
#else
wns::Position Crossing::getPosition(const MapUser* /*user*/) const
#endif // NOT defined WNS_NDEBUG
{
    assure(user->currentObject==this->id, "User/Crossing mismatch.");
    return position;
}

std::vector<MapObject::ID> Crossing::getDependencies() const
{
    return connections;
}

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