#ifndef SMESHGUI_FUNCTION_PREVIEW_HEADER
#define SMESHGUI_FUNCTION_PREVIEW_HEADER

#include "qwt_plot.h"
#include <SALOMEconfig.h>
#include CORBA_SERVER_HEADER(SMESH_Mesh)
#include <ExprIntrp_GenExp.hxx>
#include <Expr_Array1OfNamedUnknown.hxx>
#include <TColStd_Array1OfReal.hxx>

class SMESHGUI_FunctionPreview : public QwtPlot
{
  Q_OBJECT

public:
  SMESHGUI_FunctionPreview( QWidget* );
  virtual ~SMESHGUI_FunctionPreview();

  QString   function() const;
  bool      isTableFunc() const;
  void      tableFunc( SMESH::double_array& ) const;
  void      interval( double&, double& ) const;
  int       pointsCount() const;
  bool      isDone() const;

  bool      setParams( const QString&, const double = 0.0, const double = 1.0, const int = 50, const bool = true );
  bool      setParams( const SMESH::double_array&, const double = 0.0, const double = 1.0, const bool = true );
  void      setIsExp( const bool, const bool = true );

protected:
  virtual   bool   init( const QString& );
  virtual   double funcValue( const double, bool& );
  virtual   bool   createTable( SMESH::double_array& );
  virtual   void   drawContents( QPainter* );

private:
  double calc( bool& );

private:
  QString              myFunction;
  double               myXmin, myXmax;
  int                  myPoints;
  bool                 myIsTable;
  bool                 myIsExp;
  SMESH::double_array  myTableFunc;
  long                 myCurve;
  Handle(ExprIntrp_GenExp)  myExpr;
  Expr_Array1OfNamedUnknown myVars;
  TColStd_Array1OfReal  myValues;
  bool                 myIsDone;
};

#endif