polynomialmassprofilelens.h

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/*

  This file is a part of GRALE, a library to facilitate the simulation
  and inversion of gravitational lenses.

  Copyright (C) 2008-2012 Jori Liesenborgs

  Contact: jori.liesenborgs@gmail.com
  
  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 St, Fifth Floor, Boston, MA  02110-1301  USA
  
*/

#ifndef GRALE_POLYNOMIALMASSPROFILELENS_H

#define GRALE_POLYNOMIALMASSPROFILELENS_H

#include "graleconfig.h"
#include "symmetriclens.h"
#include <vector>
#include <list>

// Here, the profile refers to the profile of the total mass M(theta)

namespace grale
{

class GRALE_IMPORTEXPORT PolynomialPart
{
public:
        PolynomialPart();
        PolynomialPart(double xOffset, double yOffset, double xScale, double yScale, double xEnd, const std::vector<double> &coefficients);
        PolynomialPart(const PolynomialPart &polynomialPart);
        ~PolynomialPart();
        double getXOffset() const                                                                       { return m_xOffset; }
        double getYOffset() const                                                                       { return m_yOffset; }
        double getXScale() const                                                                        { return m_xScale; }
        double getYScale() const                                                                        { return m_yScale; }
        double getEndPosition() const                                                                   { return m_xEnd; }
        const std::vector<double> &getCoefficients() const                                              { return m_coefficients; }
        const std::vector<double> &getOffsetCoefficients() const                                        { return m_offsetCoefficients; }

        PolynomialPart &operator=(const PolynomialPart &p);
private:
        void calculateOffsetCoefficients();
        
        double m_xOffset;
        double m_yOffset;
        double m_xScale;
        double m_yScale;
        double m_xEnd;
        std::vector<double> m_coefficients;
        std::vector<double> m_offsetCoefficients;
};

class GRALE_IMPORTEXPORT PolynomialMassProfileLensParams : public GravitationalLensParams
{
public:
        PolynomialMassProfileLensParams();
        ~PolynomialMassProfileLensParams();
        void addPolynomialPart(const PolynomialPart &p);
        const std::list<PolynomialPart> &getPolynomialParts() const                                     { return m_polynomialParts; }

        bool write(serut::SerializationInterface &si) const;
        bool read(serut::SerializationInterface &si);
        GravitationalLensParams *createCopy() const;
private:
        std::list<PolynomialPart> m_polynomialParts;
};

class GRALE_IMPORTEXPORT PolynomialZeroMassLensParams : public PolynomialMassProfileLensParams
{
public:
        PolynomialZeroMassLensParams(double D_d, double densityScale, double angularRadius, double zeroPoint);
        ~PolynomialZeroMassLensParams();
};

class GRALE_IMPORTEXPORT PolynomialTimeDelayLensParams : public PolynomialMassProfileLensParams
{
public:
        PolynomialTimeDelayLensParams(double theta1, double theta2, double timeDiff, double zLens);
        ~PolynomialTimeDelayLensParams();
};

class GRALE_IMPORTEXPORT PolynomialMassProfileLens : public SymmetricLens
{
public:
        PolynomialMassProfileLens();
        ~PolynomialMassProfileLens();
        
        bool getProjectedPotential(double D_s, double D_ds, Vector2D<double> theta, 
                                   double *pPotentialValue) const;
protected:
        bool processParameters(const GravitationalLensParams *pLensParams);
        double getMassInside(double thetaLength) const;
        double getProfileSurfaceMassDensity(double thetaLength) const;
private:
        std::vector<PolynomialPart> m_polynomialParts;
        std::vector<double> m_potentialOffsets;
        double m_totalMass;
        double m_totalPotential;
        double m_endPosition;
};

} // end namespace

#endif // GRALE_POLYNOMIALMASSPROFILELENS_H