squarelens.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_SQUARELENS_H

#define GRALE_SQUARELENS_H

#include "graleconfig.h"
#include "gravitationallens.h"

namespace grale
{

class GRALE_IMPORTEXPORT SquareLensParams : public GravitationalLensParams
{
public:
        SquareLensParams()                                                              { lensmass = 0; angwidth = 0; }

        SquareLensParams(double mass, double angularWidth)                              { lensmass = mass; angwidth = angularWidth; }

        double getLensMass() const                                                      { return lensmass; }

        double getAngularWidth() const                                                  { return angwidth; }
        
        GravitationalLensParams *createCopy() const;
        bool write(serut::SerializationInterface &si) const;
        bool read(serut::SerializationInterface &si);
private:
        double lensmass,angwidth;
};

class GRALE_IMPORTEXPORT SquareLens : public GravitationalLens
{
public:
        SquareLens();
        ~SquareLens();
        bool getAlphaVector(Vector2D<double> theta,Vector2D<double> *pAlpha) const;
        double getSurfaceMassDensity(Vector2D<double> theta) const;
        bool getProjectedPotential(double D_s, double D_ds, Vector2D<double> theta, double *pPotentialValue) const;
        bool getAlphaVectorDerivatives(Vector2D<double> theta, double &axx, double &ayy, double &axy) const;

        bool getSuggestedScales(double *pDeflectionScale, double *pPotentialScale) const;
        bool getCLParameterCounts(int *pNumIntParams, int *pNumFloatParams) const;
        bool getCLParameters(double deflectionScale, double potentialScale, int *pIntParams, float *pFloatParams) const;
        std::string getCLProgram(std::string &subRoutineName) const;
        int getCLSubLenses() const                                                      { return 1; }
protected:
        bool processParameters(const GravitationalLensParams *pLensParams);
private:
        static double deflectionFunction1(double x, double y)                           { return (0.5*y*LN(x*x+y*y)+x*ATAN(y/x)); }
        static double deflectionFunction2(double x, double y)                           { return (0.5*x*LN(x*x+y*y)+y*ATAN(x/y)); }
        static double deriv11(double x, double y)                                       { return ATAN(y/x); }
        static double deriv22(double x, double y)                                       { return ATAN(x/y); }
        static double deriv12(double x, double y)                                       { return 0.5*LN(x*x+y*y); }
        static double potential(double x, double y)                                     { return 0.5*(x*x*ATAN(y/x)+y*y*ATAN(x/y)+x*y*(LN(x*x+y*y))); }

        double mass,angularwidth,angularwidth2;
        double angularscale,angularscale2;
        double relativeangularwidth2;
        double rawd2,dens;
};                    

} // end namespace

#endif // GRALE_SQUARELENS_H