/data/refman/pasoursint/CMSSW_4_1_8_patch12/src/PhysicsTools/IsolationUtils/interface/IntegralOverPhiFunction.h

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#ifndef PhysicsTools_IsolationUtils_IntegralOverPhiFunction_h
#define PhysicsTools_IsolationUtils_IntegralOverPhiFunction_h

// -*- C++ -*-
//
// Package:    IntegralOverPhiFunction
// Class:      IntegralOverPhiFunction
// 
//
// Original Author:  Christian Veelken, UC Davis
//         Created:  Thu Nov  2 13:47:40 CST 2006
// $Id: IntegralOverPhiFunction.h,v 1.2 2009/01/14 10:53:14 hegner Exp $
//
//

// ROOT include files
#include <Math/ParamFunction.h>

//
// class declaration
//

class IntegralOverPhiFunction : public ROOT::Math::ParamFunction<ROOT::Math::IParametricGradFunctionOneDim>
{
 public:
  IntegralOverPhiFunction();
  ~IntegralOverPhiFunction();

  void SetParameterTheta0(double theta0);
  void SetParameterPhi0(double phi0);
  void SetParameterAlpha(double alpha);

  virtual ROOT::Math::IGenFunction* Clone () const { return new IntegralOverPhiFunction(*this); }

 private:
  void SetParameters(double* param);

  double DoEval(double x) const;
  virtual double DoEvalPar(double x, const double* param) const;
  double DoDerivative(double x) const;
  virtual double DoParameterDerivative(double, const double*, unsigned int) const;
  void DoParameterGradient(double x, double* paramGradient) const;

  mutable double theta0_; // polar angle of cone axis
  mutable double phi0_; // azimuth angle of cone axis
  mutable double alpha_; // opening angle of cone (measured from cone axis)

// !!! ONLY FOR TESTING
  mutable unsigned int numSolutionMin1_;
  mutable unsigned int numSolutionMax1_;
  mutable unsigned int numSolutionMin2_;
  mutable unsigned int numSolutionMax2_;
  mutable unsigned int numSolutionMin3_;
  mutable unsigned int numSolutionMax3_;
  mutable unsigned int numSolutionMin4_;
  mutable unsigned int numSolutionMax4_;
//     FOR TESTING ONLY !!!

  static const unsigned int debugLevel_ = 0;
};

#endif