// Created on: 1994-07-06
// Created by: Laurent PAINNOT
// Copyright (c) 1994-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _Extrema_ExtCC2d_HeaderFile
#define _Extrema_ExtCC2d_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>

#include <Standard_Boolean.hxx>
#include <Extrema_SequenceOfPOnCurv2d.hxx>
#include <TColStd_SequenceOfReal.hxx>
#include <Standard_Integer.hxx>
#include <Standard_Address.hxx>
#include <Standard_Real.hxx>
#include <gp_Pnt2d.hxx>

class Adaptor2d_Curve2d;
class Extrema_POnCurv2d;
class Extrema_ExtElC2d;
class Extrema_ECC2d;


//! It calculates all the distance between two curves.
//! These distances can be maximum or minimum.
class Extrema_ExtCC2d 
{
public:

  DEFINE_STANDARD_ALLOC

  
  Standard_EXPORT Extrema_ExtCC2d();
  
  //! It calculates all the distances.
  Standard_EXPORT Extrema_ExtCC2d(const Adaptor2d_Curve2d& C1, const Adaptor2d_Curve2d& C2, const Standard_Real TolC1 = 1.0e-10, const Standard_Real TolC2 = 1.0e-10);
  
  //! It calculates all the distances.
  Standard_EXPORT Extrema_ExtCC2d(const Adaptor2d_Curve2d& C1, const Adaptor2d_Curve2d& C2, const Standard_Real U1, const Standard_Real U2, const Standard_Real V1, const Standard_Real V2, const Standard_Real TolC1 = 1.0e-10, const Standard_Real TolC2 = 1.0e-10);
  
  //! initializes the fields.
  Standard_EXPORT void Initialize (const Adaptor2d_Curve2d& C2, const Standard_Real V1, const Standard_Real V2, const Standard_Real TolC1 = 1.0e-10, const Standard_Real TolC2 = 1.0e-10);
  
  Standard_EXPORT void Perform (const Adaptor2d_Curve2d& C1, const Standard_Real U1, const Standard_Real U2);
  
  //! Returns True if the distances are found.
  Standard_EXPORT Standard_Boolean IsDone() const;
  
  //! Returns the number of extremum distances.
  Standard_EXPORT Standard_Integer NbExt() const;
  
  //! Returns True if the two curves are parallel.
  Standard_EXPORT Standard_Boolean IsParallel() const;
  
  //! Returns the value of the Nth extremum square distance.
  Standard_EXPORT Standard_Real SquareDistance (const Standard_Integer N = 1) const;
  
  //! Returns the points of the Nth extremum distance.
  //! P1 is on the first curve, P2 on the second one.
  Standard_EXPORT void Points (const Standard_Integer N, Extrema_POnCurv2d& P1, Extrema_POnCurv2d& P2) const;
  
  //! if the curve is a trimmed curve,
  //! dist11 is a square distance between the point on C1
  //! of parameter FirstParameter and the point of
  //! parameter FirstParameter on C2.
  Standard_EXPORT void TrimmedSquareDistances (Standard_Real& dist11, Standard_Real& distP12, Standard_Real& distP21, Standard_Real& distP22, gp_Pnt2d& P11, gp_Pnt2d& P12, gp_Pnt2d& P21, gp_Pnt2d& P22) const;

  //! Set flag for single extrema computation. Works on parametric solver only.
  Standard_EXPORT void SetSingleSolutionFlag (const Standard_Boolean theSingleSolutionFlag);

  //! Get flag for single extrema computation. Works on parametric solver only.
  Standard_EXPORT Standard_Boolean GetSingleSolutionFlag () const;


protected:

  
  Standard_EXPORT void Results (const Extrema_ExtElC2d& AlgExt, const Standard_Real Ut11, const Standard_Real Ut12, const Standard_Real Ut21, const Standard_Real Ut22, const Standard_Real Period1 = 0.0, const Standard_Real Period2 = 0.0);
  
  Standard_EXPORT void Results (const Extrema_ECC2d& AlgExt, const Standard_Real Ut11, const Standard_Real Ut12, const Standard_Real Ut21, const Standard_Real Ut22, const Standard_Real Period1 = 0.0, const Standard_Real Period2 = 0.0);




private:


  Standard_Boolean myIsFindSingleSolution; // Default value is false.
  Standard_Boolean myDone;
  Standard_Boolean myIsPar;
  Extrema_SequenceOfPOnCurv2d mypoints;
  TColStd_SequenceOfReal mySqDist;
  Standard_Integer mynbext;
  Standard_Boolean inverse;
  const Adaptor2d_Curve2d* myC;
  Standard_Real myv1;
  Standard_Real myv2;
  Standard_Real mytolc1;
  Standard_Real mytolc2;
  gp_Pnt2d P1f;
  gp_Pnt2d P1l;
  gp_Pnt2d P2f;
  gp_Pnt2d P2l;
  Standard_Real mydist11;
  Standard_Real mydist12;
  Standard_Real mydist21;
  Standard_Real mydist22;


};







#endif // _Extrema_ExtCC2d_HeaderFile