/*****************************************************************************
 * Authors:                                                                  *
 *   MC, Mathieu Chrétien, LPNHE Paris , chretien@lpnhe.in2p3.fr       *
 *****************************************************************************/
#ifndef ROOGRAPHVAR
#define ROOGRAPHVAR

#include "RooAbsReal.h"
#include "RooGraphVar.h"
#include "RooArgList.h"
#include "RooRealProxy.h"
#include "RooTrace.h"

class RooArgSet ;

class RooGraphVar : public RooAbsReal {
public:
  // Constructors, assignment etc
  RooGraphVar(const char *name, const char* title, TGraph TGraphObj, RooAbsReal& x,TSpline* spline, Option_t*  option) ;
  RooGraphVar(const RooGraphVar& other, const char* name=0);
  virtual TObject* clone(const char* newname) const { return new RooGraphVar(*this,newname); }
  virtual ~RooGraphVar();

  

  // Function evaluation
  virtual Double_t evaluate() const ;
  Double_t getRangeMin() const;
  Double_t getRangeMax() const;
  
protected:
  
  TGraph _graph ;            // TGraph object
  RooRealProxy _x ;     // Actual parameter used by TGraph
  mutable RooArgSet* _nset ;     //! Normalization set to be passed along to contents
  
  TSpline* _spline;          // spline implementation
  Option_t*  _option;       // Option string
  

  ClassDef(RooGraphVar,1) // Real-valued function of other RooAbsArg calculated by a TGraph object
};

#endif