symmetriclens.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_SYMMETRICLENS_H

#define GRALE_SYMMETRICLENS_H

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

namespace grale
{

class GRALE_IMPORTEXPORT SymmetricLens : public GravitationalLens
{
protected:
        SymmetricLens(GravitationalLens::LensType t);
public:
        ~SymmetricLens();
        bool getAlphaVector(Vector2D<double> theta,Vector2D<double> *pAlpha) const;
        bool getAlphaVectorDerivatives(Vector2D<double> theta, double &axx, double &ayy, double &axy) const;
        double getSurfaceMassDensity(Vector2D<double> theta) const                      { return getProfileSurfaceMassDensity(theta.getLength()); }
protected:
        virtual double getMassInside(double thetaLength) const = 0;
        
        virtual double getProfileSurfaceMassDensity(double thetaLength) const = 0;
};

} // end namespace

#endif // GRALE_SYMMETRICLENS_H