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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_Lin2d2Tan_HeaderFile
 #define _GccAna_Lin2d2Tan_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 GccEnt_QualifiedCirc;
 class gp_Lin2d;
 
 //! This class implements the algorithms used to
 //! create 2d lines tangent to 2 other elements which
 //! can be circles or points.
 //! Describes functions for building a 2D line:
 //! -   tangential to 2 circles, or
 //! -   tangential to a circle and passing through a point, or
 //! -   passing through 2 points.
 //! A Lin2d2Tan object provides a framework for:
 //! -   defining the construction of 2D line(s),
 //! -   implementing the construction algorithm, and
 //! consulting the result(s).
 //! Some constructors may check the type of the qualified argument
 //! and raise BadQualifier Error in case of incorrect couple (qualifier,
 //! curv).
 //! For example: "EnclosedCirc".
 class GccAna_Lin2d2Tan
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! This methods implements the algorithms used to
   //! create 2d lines passing through 2 points.
   //! Tolerance is used because we can't create a line
   //! when the distance between the two points is too small.
   Standard_EXPORT GccAna_Lin2d2Tan(const gp_Pnt2d& ThePoint1,
                                    const gp_Pnt2d& ThePoint2,
                                    const double    Tolerance);
 
   //! This methods implements the algorithms used to
   //! create 2d lines tangent to one circle and passing
   //! through a point.
   //! Exception BadQualifier is raised in the case of
   //! EnclosedCirc
   //! Tolerance is used because there is no solution
   //! when the point is inside the solution according to
   //! the tolerance.
   Standard_EXPORT GccAna_Lin2d2Tan(const GccEnt_QualifiedCirc& Qualified1,
                                    const gp_Pnt2d&             ThePoint,
                                    const double                Tolerance);
 
   //! This methods implements the algorithms used to
   //! create 2d lines tangent to 2 circles.
   //! Exception BadQualifier is raised in the case of
   //! EnclosedCirc
   Standard_EXPORT GccAna_Lin2d2Tan(const GccEnt_QualifiedCirc& Qualified1,
                                    const GccEnt_QualifiedCirc& Qualified2,
                                    const double                Tolerance);
 
   //! This method returns true when there is a solution
   //! and false in the other cases.
   Standard_EXPORT bool IsDone() const;
 
   //! This method 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 these outside the
   //! context of the algorithm-object. Raises OutOfRange is raised if Index is greater than
   //! the number of solutions.
   //! It raises NotDone if the algorithm failed.
   Standard_EXPORT gp_Lin2d ThisSolution(const int Index) const;
 
   //! Returns the qualifiers Qualif1 and Qualif2 of the
   //! tangency arguments for the solution of index Index
   //! computed by this algorithm.
   //! The returned qualifiers are:
   //! -   those specified at the start of construction when the
   //! solutions are defined as enclosing or outside with
   //! respect to the arguments, or
   //! -   those computed during construction (i.e. enclosing or
   //! outside) when the solutions are defined as unqualified
   //! with respect to the arguments, or
   //! -   GccEnt_noqualifier if the tangency argument is a point.
   //! Exceptions
   //! Standard_OutOfRange if Index is less than zero or
   //! greater than the number of solutions computed by this algorithm.
   //! StdFail_NotDone if the construction fails.
   Standard_EXPORT void WhichQualifier(const int        Index,
                                       GccEnt_Position& Qualif1,
                                       GccEnt_Position& Qualif2) const;
 
   //! Returns information about the tangency point between the
   //! result number Index and the first argument.
   //! ParSol is the intrinsic parameter of the point PntSol on
   //! the solution curv.
   //! ParArg is the intrinsic parameter of the point PntSol on
   //! the argument curv. Raises OutOfRange is raised if Index is greater than
   //! the number of solutions.
   //! It raises NotDone if the algorithm failed.
   Standard_EXPORT void Tangency1(const int Index,
                                  double&   ParSol,
                                  double&   ParArg,
                                  gp_Pnt2d& PntSol) const;
 
   //! Returns information about the tangency point between the
   //! result number Index and the second argument.
   //! ParSol is the intrinsic parameter of the point ParSol on
   //! the solution curv.
   //! ParArg is the intrinsic parameter of the point PntSol on
   //! the argument curv. Raises OutOfRange is raised if Index is greater than
   //! the number of solutions.
   //! It raises NotDone if the algorithm failed.
   Standard_EXPORT void Tangency2(const int Index,
                                  double&   ParSol,
                                  double&   ParArg,
                                  gp_Pnt2d& PntSol) const;
 
 private:
   bool                                WellDone;
   int                                 NbrSol;
   NCollection_Array1<gp_Lin2d>        linsol;
   NCollection_Array1<GccEnt_Position> qualifier1;
   NCollection_Array1<GccEnt_Position> qualifier2;
   NCollection_Array1<gp_Pnt2d>        pnttg1sol;
   NCollection_Array1<gp_Pnt2d>        pnttg2sol;
   NCollection_Array1<double>          par1sol;
   NCollection_Array1<double>          par2sol;
   NCollection_Array1<double>          pararg1;
   NCollection_Array1<double>          pararg2;
 };
 
 #endif // _GccAna_Lin2d2Tan_HeaderFile

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