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 // Created on: 1991-03-29
 // 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 _Geom2dGcc_Circ2d2TanOnGeo_HeaderFile
 #define _Geom2dGcc_Circ2d2TanOnGeo_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
 #include <Standard_Integer.hxx>
 #include <gp_Circ2d.hxx>
 #include <NCollection_Array1.hxx>
 #include <GccEnt_Position.hxx>
 #include <gp_Pnt2d.hxx>
 class GccEnt_QualifiedCirc;
 class Geom2dAdaptor_Curve;
 class GccEnt_QualifiedLin;
 class gp_Pnt2d;
 class gp_Circ2d;
 
 //! This class implements the algorithms used to
 //! create 2d circles TANgent to 2 entities and
 //! having the center ON a curve.
 //! The order of the tangency argument is always
 //! QualifiedCirc, QualifiedLin, QualifiedCurv, Pnt2d.
 //! the arguments are :
 //! - The two tangency arguments (lines, circles or points).
 //! - The center line (a curve).
 //! - The parameter for each tangency argument which
 //! is a curve.
 //! - The tolerance.
 class Geom2dGcc_Circ2d2TanOnGeo
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! This method implements the algorithms used to
   //! create 2d circles TANgent to two 2d circles and
   //! having the center ON a curve.
   Standard_EXPORT Geom2dGcc_Circ2d2TanOnGeo(const GccEnt_QualifiedCirc& Qualified1,
                                             const GccEnt_QualifiedCirc& Qualified2,
                                             const Geom2dAdaptor_Curve&  OnCurv,
                                             const double                Tolerance);
 
   //! This method implements the algorithms used to
   //! create 2d circles TANgent to a 2d circle and a 2d line
   //! having the center ON a curve.
   Standard_EXPORT Geom2dGcc_Circ2d2TanOnGeo(const GccEnt_QualifiedCirc& Qualified1,
                                             const GccEnt_QualifiedLin&  Qualified2,
                                             const Geom2dAdaptor_Curve&  OnCurv,
                                             const double                Tolerance);
 
   //! This method implements the algorithms used to
   //! create 2d circles TANgent to a 2d circle and a point
   //! having the center ON a curve.
   Standard_EXPORT Geom2dGcc_Circ2d2TanOnGeo(const GccEnt_QualifiedCirc& Qualified1,
                                             const gp_Pnt2d&             Point2,
                                             const Geom2dAdaptor_Curve&  OnCurv,
                                             const double                Tolerance);
 
   //! This method implements the algorithms used to
   //! create 2d circles TANgent to two 2d lines
   //! having the center ON a curve.
   Standard_EXPORT Geom2dGcc_Circ2d2TanOnGeo(const GccEnt_QualifiedLin& Qualified1,
                                             const GccEnt_QualifiedLin& Qualified2,
                                             const Geom2dAdaptor_Curve& OnCurv,
                                             const double               Tolerance);
 
   //! This method implements the algorithms used to
   //! create 2d circles TANgent to a 2d line and a point
   //! having the center ON a 2d line.
   Standard_EXPORT Geom2dGcc_Circ2d2TanOnGeo(const GccEnt_QualifiedLin& Qualified1,
                                             const gp_Pnt2d&            Qualified2,
                                             const Geom2dAdaptor_Curve& OnCurv,
                                             const double               Tolerance);
 
   //! This method implements the algorithms used to
   //! create 2d circles TANgent to two points
   //! having the center ON a 2d line.
   Standard_EXPORT Geom2dGcc_Circ2d2TanOnGeo(const gp_Pnt2d&            Point1,
                                             const gp_Pnt2d&            Point2,
                                             const Geom2dAdaptor_Curve& OnCurv,
                                             const double               Tolerance);
 
   //! This method returns True if the construction
   //! algorithm succeeded.
   Standard_EXPORT bool IsDone() const;
 
   //! This method returns the number of solutions.
   //! It 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.
   //! It raises NotDone if the construction algorithm
   //! didn't succeed.
   //! It raises OutOfRange if Index is greater than the
   //! number of solutions.
   Standard_EXPORT gp_Circ2d ThisSolution(const int Index) const;
 
   //! It 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 computedin case of unqualified).
   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 on the
   //! solution curv.
   //! ParArg is the intrinsic parameter of the point on the
   //! argument curv.
   //! PntSol is the tangency point on the solution curv.
   //! PntArg is the tangency point on the argument curv.
   //! It 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& 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 on the
   //! solution curv.
   //! ParArg is the intrinsic parameter of the point on the
   //! argument curv.
   //! PntSol is the tangency point on the solution curv.
   //! PntArg is the tangency point on the argument curv.
   //! It raises NotDone if the construction algorithm
   //! didn't succeed.
   //! It raises OutOfRange if Index is greater than the
   //! number of solutions.
   Standard_EXPORT void Tangency2(const int Index,
                                  double&   ParSol,
                                  double&   ParArg,
                                  gp_Pnt2d& PntSol) const;
 
   //! Returns information about the center (on the curv)
   //! of the result.
   //! ParArg is the intrinsic parameter of the point on
   //! the argument curv.
   //! PntSol is the center point of the solution curv.
   //! It raises NotDone if the construction algorithm
   //! didn't succeed.
   //! It raises OutOfRange if Index is greater than the
   //! number of solutions.
   Standard_EXPORT void CenterOn3(const int Index, double& ParArg, gp_Pnt2d& PntSol) const;
 
   //! Returns True if the solution number Index is equal to
   //! the first argument and False in the other cases.
   //! It raises NotDone if the construction algorithm
   //! didn't succeed.
   //! It raises OutOfRange if Index is greater than the
   //! number of solutions.
   Standard_EXPORT bool IsTheSame1(const int Index) const;
 
   //! Returns True if the solution number Index is equal to
   //! the second argument and False in the other cases.
   //! It raises NotDone if the construction algorithm
   //! didn't succeed.
   //! It raises OutOfRange if Index is greater than the
   //! number of solutions.
   Standard_EXPORT bool IsTheSame2(const int Index) const;
 
 private:
   bool                                WellDone;
   int                                 NbrSol;
   NCollection_Array1<gp_Circ2d>       cirsol;
   NCollection_Array1<GccEnt_Position> qualifier1;
   NCollection_Array1<GccEnt_Position> qualifier2;
   NCollection_Array1<int>             TheSame1;
   NCollection_Array1<int>             TheSame2;
   NCollection_Array1<gp_Pnt2d>        pnttg1sol;
   NCollection_Array1<gp_Pnt2d>        pnttg2sol;
   NCollection_Array1<gp_Pnt2d>        pntcen;
   NCollection_Array1<double>          par1sol;
   NCollection_Array1<double>          par2sol;
   NCollection_Array1<double>          pararg1;
   NCollection_Array1<double>          pararg2;
   NCollection_Array1<double>          parcen3;
 };
 
 #endif // _Geom2dGcc_Circ2d2TanOnGeo_HeaderFile

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