DiffractionPathSelector.h

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/*
 * Copyright (C) <2012> <EDF-R&D> <FRANCE>
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#ifndef DIFFRACTION_PATH_SELECTOR
#define DIFFRACTION_PATH_SELECTOR

#include "Selector.h"

template<typename T>
class DiffractionPathSelector : public Selector<T>
{
public :
    DiffractionPathSelector(double _maximumDelta = 8) : Selector<T>() { maximumDelta = _maximumDelta; }
    virtual Selector<T>* Copy()
    {
        DiffractionPathSelector* newSelector = new DiffractionPathSelector(maximumDelta);
        newSelector->setIsDeletable(this->deletable);
        return newSelector;
    }

    virtual SELECTOR_RESPOND canBeInserted(T* r, unsigned long long& replace)
    {
        vector< boost::shared_ptr<Event> > *events = r->getEvents();
                if (events->size() == 0) { return SELECTOR_ACCEPT; }


                decimal cumul_delta = 0.;        //Cumulative distance added by the diffractions
                decimal cumul_distance = 0.; //Cumulative distance since last reflection

                bool notLast = true;
                Recepteur *pRecep = static_cast<Recepteur*>( r->getRecepteur() );
                Source *pSource = r->getSource();

                vec3 origin = pRecep->getPosition();
                vec3 current_pos = origin;

                // Iterate other the list of events in REVERSE order
                vector< boost::shared_ptr<Event> >::reverse_iterator rit = events->rbegin();
                while(rit != events->rend())
                {
                        cumul_distance += (*rit)->getPosition().distance(current_pos);
                        //if current event is a reflection
                        if ( (*rit)->getType() == SPECULARREFLEXION ) 
                        {
                                //accumulate the difference between :
                                //      - the cumulative distance since last reflection 
                                //      and
                                //      - the direct distance between the current position and the last reflection
                                //(Note: the difference between cumul_distance and the direct distance is zero if no diffraction as been encountered)
                                decimal direct_distance= origin.distance( (*rit)->getPosition());
                                cumul_delta += ( cumul_distance - direct_distance );
                                
                                //Reset cumul_distance
                                cumul_distance = 0;

                                //Save the position of the current reflection
                                origin = (*rit)->getPosition();
                                notLast = false;
                        }
                        //if the current event is a diffraction 
                        else
                        {
                                
                                notLast = true;
                        }

                        current_pos = (*rit)->getPosition(); 
                        rit ++;
                };

                //if the first event is a diffraction finish the computation with the source 
                if (notLast) 
                { 
                        //Accumulate the distance from the current position to the source
                        cumul_distance += current_pos.distance( pSource->getPosition() );
                        //Computer the direct distance between the source and the first reflection
                        decimal direct_distance= origin.distance( pSource->getPosition());
                        //Compute the difference between the cumulative and the direct distances
                        cumul_delta += ( cumul_distance - direct_distance );
                }
 
 
        if ( cumul_delta > maximumDelta )
        {
                        return SELECTOR_REJECT;
        }

        return SELECTOR_ACCEPT;
    }
    virtual void insert(T* r, unsigned long long& replace) { return; }

    virtual bool insertWithTest(T* r)
    {
        vector< boost::shared_ptr<Event> > *events = r->getEvents();
                
                if (events->size() == 0) { return true; }

                decimal cumul_delta = 0.;               //Cumulative distance added by the diffractions
                decimal cumul_distance = 0.;    //Cumulative distance since last reflection
                bool notLast = true;
                
                Recepteur *pRecep = static_cast<Recepteur*>( r->getRecepteur() );
                Source *pSource = r->getSource();

                vec3 origin = pRecep->getPosition();
                vec3 current_pos = origin;

                // Iterate other the list of events in REVERSE order
                vector< boost::shared_ptr<Event> >::reverse_iterator rit = events->rbegin();
                while(rit != events->rend())
                {
                        cumul_distance += (*rit)->getPosition().distance(current_pos);
                        //if current event is a reflection
                        if ( (*rit)->getType() == SPECULARREFLEXION ) 
                        {
                                //accumulate the difference between :
                                //      - the cumulative distance since last reflection 
                                //      and
                                //      - the direct distance between the current position and the last reflection
                                //(Note: the difference between cumul_distance and the direct distance is zero if no diffraction as been encountered)
                                decimal direct_distance= origin.distance( (*rit)->getPosition());
                                cumul_delta += ( cumul_distance - direct_distance );
                                
                                //Reset cumul_distance
                                cumul_distance = 0;

                                //Save the position of the current reflection
                                origin = (*rit)->getPosition();
                                notLast = false;
                        }
                        //if the current event is a diffraction 
                        else
                        {
                                
                                notLast = true;
                        }

                        current_pos = (*rit)->getPosition(); 
                        rit ++;
                };

                //if the first event is a diffraction finish the computation with the source 
                if (notLast) 
                { 
                        //Accumulate the distance from the current position to the source
                        cumul_distance += current_pos.distance( pSource->getPosition() );
                        //Computer the direct distance between the source and the first reflection
                        decimal direct_distance= origin.distance( pSource->getPosition());
                        //Compute the difference between the cumulative and the direct distances
                        cumul_delta += ( cumul_distance - direct_distance );
                }
 
        if ( cumul_delta > maximumDelta )
        {
                        return false;
        }

        return true;
    }
    double getMaximumDelta() { return maximumDelta; }

    void setMaximumDelta(double _maximumDelta) { this->maximumDelta = _maximumDelta; }

        virtual const char* getSelectorName(){
                return typeid(this).name();
        }


protected:
    double maximumDelta; 
};

#endif // DIFFRACTION_PATH_SELECTOR