circularsource.h

/*

  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_CIRCULARSOURCE_H

#define GRALE_CIRCULARSOURCE_H

#include "graleconfig.h"
#include "sourceimage.h"

namespace grale
{

class GRALE_IMPORTEXPORT CircularSource : public SourceImage
{
public:
        CircularSource(Vector2D<double> angularpos, double angularradius, double brightnessScale);
        ~CircularSource();
        SourceImage *createCopy() const;
        bool isSerializable() const                                             { return true; }
        double getAngularRadius() const                                         { return radius; }
        void setAngularRadius(double r)                                         { radius = r; radius2 = r*r; }
        void setFade(bool f)                                                    { fade = f; }
protected:
        CircularSource();
        
        bool writeInternal(serut::SerializationInterface &si) const;
        bool readInternal(serut::SerializationInterface &si);
        double getIntensityInternal(Vector2D<double> diff) const;
        double getMaxRadius() const                                             { return radius; }
private:
        double radius,radius2;
        bool fade;
        
        friend class SourceImage;
};

inline double CircularSource::getIntensityInternal(Vector2D<double> diff) const
{
        if (diff.getLengthSquared() <= radius2)
        {
                double val = 1.0;
                
                if (fade)
                        val *= (1.0-(diff.getLengthSquared()/radius2));
                
                return val;
        }
        return 0;
}

} // end namespace

#endif // GRALE_CIRCULARSOURCE_H