Lens.h

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#ifndef _TelescopeSimulatorKG_Lens_h_
#define _TelescopeSimulatorKG_Lens_h_


namespace utl {
  class Photon;
  class Vector;
  class TabulatedFunction;
  class RandomEngine;
}

namespace fdet {
  class Telescope;
}

#include "RTResult.h"

#include <utl/CoordinateSystemPtr.h>
#include <utl/Point.h>

#include <string>

class TObjArray;

namespace TelescopeSimulatorKG {

  //class Photon;

  class Lens {

  public:
    Lens(utl::RandomEngine& rndm, const fdet::Telescope& tel);

    RTResult Trace(const utl::Photon& photonIn, utl::Photon& photonOut);

    TObjArray* Draw();

  private:
    double Profile(const double r) const;
    utl::Vector Curvature(const double x, const double y) const;

  private:
    utl::RandomEngine *fRandom;

    utl::CoordinateSystemPtr fTelCS; // reference system
    utl::Point fOrigin;

    double fR1, fR2;       // geometry (R1=.85m, R2=1.1m)
    double fInd1;          // reflection index of air
    //double fInd2;           // reflection index of corrector plate material
                           // (ind1) and out side (ind2)
    const utl::TabulatedFunction *fRefractiveIndex;
    const utl::TabulatedFunction *fTransmittance;
    double fSigRho;        // uncertaint in the definition of normal of the
                           // surface of the Lens

  };

} // TelescopeSimulatorKG

#endif // _TelescopeSimulatorKG_Lens_h_

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