TGo4FitModelFunction.h

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// $Id$
//-----------------------------------------------------------------------
//       The GSI Online Offline Object Oriented (Go4) Project
//         Experiment Data Processing at EE department, GSI
//-----------------------------------------------------------------------
// Copyright (C) 2000- GSI Helmholtzzentrum fuer Schwerionenforschung GmbH
//                     Planckstr. 1, 64291 Darmstadt, Germany
// Contact:            http://go4.gsi.de
//-----------------------------------------------------------------------
// This software can be used under the license agreements as stated
// in Go4License.txt file which is part of the distribution.
//-----------------------------------------------------------------------
 
#ifndef TGO4FITMODELFUNCTION_H
#define TGO4FITMODELFUNCTION_H
 
#include "TGo4FitModel.h"
 
typedef Double_t (*TUserFunction)(Double_t *, Double_t *);

class TGo4FitModelFunction : public TGo4FitModel {
   public:

      TGo4FitModelFunction();

      TGo4FitModelFunction(const char *iName, TUserFunction iUserFunction, Int_t iNPars, Bool_t AddAmplitude = kFALSE);

      TGo4FitModelFunction(const char *iName, const char *iLibraryName = "libName.so", const char *iFunctionName = "Funcname", Int_t iNPars = 0, Bool_t AddAmplitude = kFALSE);

      virtual ~TGo4FitModelFunction();

      Bool_t CanAmplTouch() override { return kTRUE; }

      void SetUserFunction(TUserFunction iUserFunction);

      void SetUserFunction(const char *iLibraryName, const char *iFunctionName);

      const char *GetLibraryName() const { return fxLibraryName.Data(); }

      void SetLibraryName(const char *name) { fxLibraryName = name; }

      const char *GetFunctionName() const { return fxFunctionName.Data(); }

      void SetFunctionName(const char *name) { fxFunctionName = name; }

      Int_t GetNumberOfFuncPar();

      Bool_t SetNumberOfFuncPar(Int_t num);
 
      void SetPosParIndex(Int_t naxis, Int_t indx = -1);
      void SetWidthParIndex(Int_t naxis, Int_t indx = -1);

      Bool_t BeforeEval(Int_t ndim) override;
      void AfterEval() override;
 
      void Print(Option_t *option = "") const override;
 
   protected:

      Bool_t Initialize(Int_t UseBuffers = -1) override;

      void Finalize() override;
 
      virtual TString GetFuncParName(Int_t n);
      TGo4FitParameter *GetFuncPar(Int_t n);
 
      Int_t GetPosParIndex(Int_t naxis) override;
      Int_t GetWidthParIndex(Int_t naxis) override;
 
      Double_t UserFunction(Double_t *Coordinates, Double_t *Parameters) override;
 
      Bool_t LoadLibrary(Bool_t CloseFirst);
      void CloseLibrary();

      TString fxLibraryName;

      TString fxFunctionName;
 
      TArrayI fxPosIndex;
 
      TArrayI fxWidthIndex;
 
   private:

      TUserFunction fxUserFunction{nullptr};             

      void *fxLibrary{nullptr};                          
 
   ClassDefOverride(TGo4FitModelFunction,1)
};
 
#endif // TGO4FITMODELFUNCTION_H