// Created on: 1991-02-21
// Created by: Isabelle GRIGNON
// Copyright (c) 1991-1999 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_ExtSS_HeaderFile
#define _Extrema_ExtSS_HeaderFile

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

#include <Extrema_ExtElSS.hxx>
#include <Extrema_SequenceOfPOnSurf.hxx>
#include <Standard_Real.hxx>
#include <TColStd_SequenceOfReal.hxx>
#include <GeomAbs_SurfaceType.hxx>
#include <Standard_Integer.hxx>
class Adaptor3d_Surface;
class Extrema_POnSurf;


//! It calculates all the extremum distances
//! between two surfaces.
//! These distances can be minimum or maximum.
class Extrema_ExtSS 
{
public:

  DEFINE_STANDARD_ALLOC

  
  Standard_EXPORT Extrema_ExtSS();
  
  //! It calculates all the distances between S1 and S2.
  Standard_EXPORT Extrema_ExtSS(const Adaptor3d_Surface& S1, const Adaptor3d_Surface& S2, const Standard_Real TolS1, const Standard_Real TolS2);
  
  //! It calculates all the distances between S1 and S2.
  Standard_EXPORT Extrema_ExtSS(const Adaptor3d_Surface& S1, const Adaptor3d_Surface& S2, const Standard_Real Uinf1, const Standard_Real Usup1, const Standard_Real Vinf1, const Standard_Real Vsup1, const Standard_Real Uinf2, const Standard_Real Usup2, const Standard_Real Vinf2, const Standard_Real Vsup2, const Standard_Real TolS1, const Standard_Real TolS2);
  
  //! Initializes the fields of the algorithm.
  Standard_EXPORT void Initialize (const Adaptor3d_Surface& S2, const Standard_Real Uinf2, const Standard_Real Usup2, const Standard_Real Vinf2, const Standard_Real Vsup2, const Standard_Real TolS1);
  
  //! Computes the distances.
  //! An exception is raised if the fieds have not been
  //! initialized.
  Standard_EXPORT void Perform (const Adaptor3d_Surface& S1, const Standard_Real Uinf1, const Standard_Real Usup1, const Standard_Real Vinf1, const Standard_Real Vsup1, const Standard_Real TolS1);
  
  //! Returns True if the distances are found.
  Standard_EXPORT Standard_Boolean IsDone() const;
  
  //! Returns True if the surfaces are parallel
  Standard_EXPORT Standard_Boolean IsParallel() const;
  
  //! Returns the number of extremum distances.
  Standard_EXPORT Standard_Integer NbExt() const;
  
  //! Returns the value of the Nth resulting square distance.
  Standard_EXPORT Standard_Real SquareDistance (const Standard_Integer N) const;
  
  //! Returns the point of the Nth resulting distance.
  Standard_EXPORT void Points (const Standard_Integer N, Extrema_POnSurf& P1, Extrema_POnSurf& P2) const;

private:

  const Adaptor3d_Surface* myS2;
  Standard_Boolean myDone;
  Standard_Boolean myIsPar;
  Extrema_ExtElSS myExtElSS;
  Extrema_SequenceOfPOnSurf myPOnS1;
  Extrema_SequenceOfPOnSurf myPOnS2;
  Standard_Real myuinf1;
  Standard_Real myusup1;
  Standard_Real myvinf1;
  Standard_Real myvsup1;
  Standard_Real myuinf2;
  Standard_Real myusup2;
  Standard_Real myvinf2;
  Standard_Real myvsup2;
  Standard_Real mytolS1;
  Standard_Real mytolS2;
  TColStd_SequenceOfReal mySqDist;
  GeomAbs_SurfaceType myStype;

};

#endif // _Extrema_ExtSS_HeaderFile