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 // Created on: 1991-04-03
 // Created by: Remi GILET
 // 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 _GccAna_Lin2dTanPar_HeaderFile
 #define _GccAna_Lin2dTanPar_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
 #include <Standard_Integer.hxx>
 #include <gp_Lin2d.hxx>
 #include <NCollection_Array1.hxx>
 #include <GccEnt_Position.hxx>
 #include <gp_Pnt2d.hxx>
 class gp_Pnt2d;
 class gp_Lin2d;
 class GccEnt_QualifiedCirc;
 
 //! This class implements the algorithms used to create 2d
 //! line tangent to a circle or a point and parallel to
 //! another line.
 //! The solution has the same orientation as the
 //! second argument.
 //! Describes functions for building a 2D line parallel to a line and:
 //! -   tangential to a circle, or
 //! -   passing through a point.
 //! A Lin2dTanPar object provides a framework for:
 //! -   defining the construction of 2D line(s),
 //! -   implementing the construction algorithm, and consulting the result(s).
 class GccAna_Lin2dTanPar
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! This method implements the algorithms used to create a 2d
   //! line passing through a point and parallel to
   //! another line.
   Standard_EXPORT GccAna_Lin2dTanPar(const gp_Pnt2d& ThePoint, const gp_Lin2d& Lin1);
 
   //! This method implements the algorithms used to create a 2d
   //! line tangent to a circle and parallel to another line.
   //! It raises BadQualifier in case of EnclosedCirc.
   //! Exceptions
   //! GccEnt_BadQualifier if a qualifier is inconsistent with
   //! the argument it qualifies (for example, enclosed for a circle).
   Standard_EXPORT GccAna_Lin2dTanPar(const GccEnt_QualifiedCirc& Qualified1, const gp_Lin2d& Lin1);
 
   //! Returns True if the algorithm succeeded.
   Standard_EXPORT bool IsDone() const;
 
   //! Returns the number of solutions.
   //! Raises NotDone if the construction algorithm didn't succeed.
   Standard_EXPORT int NbSolutions() const;
 
   //! Returns the solution number Index and raises OutOfRange
   //! exception if Index is greater than the number of solutions.
   //! Be careful: the Index is only a way to get all the
   //! solutions, but is not associated to those outside the
   //! context of the algorithm-object.
   //! raises NotDone if the construction algorithm
   //! didn't succeed.
   //! It raises OutOfRange if Index is greater than the
   //! number of solutions.
   Standard_EXPORT gp_Lin2d ThisSolution(const int Index) const;
 
   //! Returns the information about the qualifiers of the
   //! tangency arguments concerning the solution number Index.
   //! It returns the real qualifiers (the qualifiers given to the
   //! constructor method in case of enclosed, enclosing and outside
   //! and the qualifiers computed in case of unqualified).
   //! Raises NotDone if the construction algorithm
   //! didn't succeed.
   //! It raises OutOfRange if Index is greater than the
   //! number of solutions.
   Standard_EXPORT void WhichQualifier(const int Index, GccEnt_Position& Qualif1) const;
 
   //! Returns information about the tangency point between the
   //! result number Index and the first argument.
   //! ParSol is the intrinsic parameter of the point on the
   //! solution curv.
   //! ParArg is the intrinsic parameter of the point on the
   //! argument curv.
   //! ParArg is equal 0 when the solution is passing through
   //! a point. Raises NotDone if the construction algorithm
   //! didn't succeed.
   //! It raises OutOfRange if Index is greater than the
   //! number of solutions.
   Standard_EXPORT void Tangency1(const int Index,
                                  double&   ParSol,
                                  double&   ParArg,
                                  gp_Pnt2d& Pnt) const;
 
 private:
   bool                                WellDone;
   int                                 NbrSol;
   NCollection_Array1<gp_Lin2d>        linsol;
   NCollection_Array1<GccEnt_Position> qualifier1;
   NCollection_Array1<gp_Pnt2d>        pnttg1sol;
   NCollection_Array1<double>          par1sol;
   NCollection_Array1<double>          pararg1;
 };
 
 #endif // _GccAna_Lin2dTanPar_HeaderFile

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