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