TGo4FitModelFormula.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 TGO4FITMODELFORMULA_H
#define TGO4FITMODELFORMULA_H

#include "TGo4FitModel.h"

class TFormula;

class TGo4FitModelFormula : public TGo4FitModel {
   public:

      TGo4FitModelFormula();

      TGo4FitModelFormula(const char *iName, const char *iExpressionStr = "", Int_t iNPars = 0, Bool_t AddAmplitude = kFALSE);

      virtual ~TGo4FitModelFormula();

      Bool_t CanAmplTouch() override { return kTRUE; }

      const char *GetExpression() const { return fxExpression.Data(); }

      void SetExpression(const char *expr) { fxExpression = expr; }

      Int_t GetNumberOfExprPar();

      Bool_t SetNumberOfExprPar(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;
      Double_t EvalN(const Double_t *v) override;
      void AfterEval() override;

      void Print(Option_t *option = "") const override;

   protected:

      Bool_t Initialize(Int_t UseBuffers = -1) override;
      void Finalize() override;

      TGo4FitParameter *GetExprPar(Int_t n);
      TString GetExprParName(Int_t n);

      Bool_t CompileFormula();
      void CloseFormula();

      Int_t GetPosParIndex(Int_t naxis) override;
      Int_t GetWidthParIndex(Int_t naxis) override;

      TString fxExpression;

      TArrayI fxPosIndex;

      TArrayI fxWidthIndex;

      TFormula *fxFormula{nullptr};               
   private:

      Int_t Par_ndim{0};                  

   ClassDefOverride(TGo4FitModelFormula,1)
};

#endif // TGO4FITMODELFORMULA_H