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 // Created on: 1992-10-20
 // Created by: Remi GILET
 // Copyright (c) 1992-1999 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_Circ2d2TanOn_HeaderFile
 #define _Geom2dGcc_Circ2d2TanOn_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <TColgp_Array1OfCirc2d.hxx>
 #include <Standard_Integer.hxx>
 #include <GccEnt_Array1OfPosition.hxx>
 #include <TColStd_Array1OfInteger.hxx>
 #include <TColgp_Array1OfPnt2d.hxx>
 #include <TColStd_Array1OfReal.hxx>
 #include <GccEnt_Position.hxx>
 class Geom2dGcc_QualifiedCurve;
 class Geom2dAdaptor_Curve;
 class Geom2d_Point;
 class GccAna_Circ2d2TanOn;
 class Geom2dGcc_Circ2d2TanOnGeo;
 class gp_Circ2d;
 class gp_Pnt2d;
 
 //! 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.
 //! - The center line.
 //! - The parameter for each tangency argument which
 //! is a curve.
 //! - The tolerance.
 class Geom2dGcc_Circ2d2TanOn
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! This method implements the algorithms used to
   //! create 2d circles TANgent to two curves and
   //! having the center ON a 2d curve.
   //! Param1 is the initial guess on the first curve QualifiedCurv.
   //! Param1 is the initial guess on the second curve QualifiedCurv.
   //! ParamOn is the initial guess on the center curve OnCurv.
   //! Tolerance is used for the limit cases.
   Standard_EXPORT Geom2dGcc_Circ2d2TanOn(const Geom2dGcc_QualifiedCurve& Qualified1,
                                          const Geom2dGcc_QualifiedCurve& Qualified2,
                                          const Geom2dAdaptor_Curve&      OnCurve,
                                          const Standard_Real             Tolerance,
                                          const Standard_Real             Param1,
                                          const Standard_Real             Param2,
                                          const Standard_Real             ParamOn);
 
   //! This method implements the algorithms used to
   //! create 2d circles TANgent to one curve and one point and
   //! having the center ON a 2d curve.
   //! Param1 is the initial guess on the first curve QualifiedCurv.
   //! ParamOn is the initial guess on the center curve OnCurv.
   //! Tolerance is used for the limit cases.
   Standard_EXPORT Geom2dGcc_Circ2d2TanOn(const Geom2dGcc_QualifiedCurve& Qualified1,
                                          const Handle(Geom2d_Point)&     Point,
                                          const Geom2dAdaptor_Curve&      OnCurve,
                                          const Standard_Real             Tolerance,
                                          const Standard_Real             Param1,
                                          const Standard_Real             ParamOn);
 
   //! This method implements the algorithms used to
   //! create 2d circles TANgent to two points and
   //! having the center ON a 2d curve.
   //! Tolerance is used for the limit cases.
   Standard_EXPORT Geom2dGcc_Circ2d2TanOn(const Handle(Geom2d_Point)& Point1,
                                          const Handle(Geom2d_Point)& Point2,
                                          const Geom2dAdaptor_Curve&  OnCurve,
                                          const Standard_Real         Tolerance);
 
   Standard_EXPORT void Results(const GccAna_Circ2d2TanOn& Circ);
 
   Standard_EXPORT void Results(const Geom2dGcc_Circ2d2TanOnGeo& Circ);
 
   //! Returns true if the construction algorithm does not fail
   //! (even if it finds no solution).
   //! Note: IsDone protects against a failure arising from a
   //! more internal intersection algorithm, which has
   //! reached its numeric limits.
   Standard_EXPORT Standard_Boolean IsDone() const;
 
   //! This method returns the number of solutions.
   //! NotDone is raised if the algorithm failed.
   Standard_EXPORT Standard_Integer 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.
   //! Exceptions
   //! Standard_OutOfRange if Index is less than or equal
   //! to zero or greater than the number of solutions
   //! computed by this algorithm.
   //! StdFail_NotDone if the construction fails.
   Standard_EXPORT gp_Circ2d ThisSolution(const Standard_Integer 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).
   //! 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 Standard_Integer Index,
                                       GccEnt_Position&       Qualif1,
                                       GccEnt_Position&       Qualif2) const;
 
   //! Returns information about the tangency point between the
   //! result 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.
   Standard_EXPORT void Tangency1(const Standard_Integer Index,
                                  Standard_Real&         ParSol,
                                  Standard_Real&         ParArg,
                                  gp_Pnt2d&              PntSol) const;
 
   //! Returns information about the tangency point between the
   //! result and the second 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.
   Standard_EXPORT void Tangency2(const Standard_Integer Index,
                                  Standard_Real&         ParSol,
                                  Standard_Real&         ParArg,
                                  gp_Pnt2d&              PntSol) const;
 
   //! Returns the center PntSol of the solution of index Index
   //! computed by this algorithm.
   //! ParArg is the parameter of the point PntSol on the third argument.
   //! 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 CenterOn3(const Standard_Integer Index,
                                  Standard_Real&         ParArg,
                                  gp_Pnt2d&              PntSol) const;
 
   //! Returns true if the solution of index Index and,
   //! respectively, the first or second argument of this
   //! algorithm are the same (i.e. there are 2 identical circles).
   //! If Rarg is the radius of the first or second argument,
   //! Rsol is the radius of the solution and dist is the
   //! distance between the two centers, we consider the two
   //! circles to be identical if |Rarg - Rsol| and dist
   //! are less than or equal to the tolerance criterion given at
   //! the time of construction of this algorithm.
   //! 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 Standard_Boolean IsTheSame1(const Standard_Integer Index) const;
 
   //! Returns true if the solution of index Index and,
   //! respectively, the first or second argument of this
   //! algorithm are the same (i.e. there are 2 identical circles).
   //! If Rarg is the radius of the first or second argument,
   //! Rsol is the radius of the solution and dist is the
   //! distance between the two centers, we consider the two
   //! circles to be identical if |Rarg - Rsol| and dist
   //! are less than or equal to the tolerance criterion given at
   //! the time of construction of this algorithm.
   //! 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 Standard_Boolean IsTheSame2(const Standard_Integer Index) const;
 
 protected:
 private:
   Standard_Boolean        WellDone;
   TColgp_Array1OfCirc2d   cirsol;
   Standard_Integer        NbrSol;
   GccEnt_Array1OfPosition qualifier1;
   GccEnt_Array1OfPosition qualifier2;
   TColStd_Array1OfInteger TheSame1;
   TColStd_Array1OfInteger TheSame2;
   TColgp_Array1OfPnt2d    pnttg1sol;
   TColgp_Array1OfPnt2d    pnttg2sol;
   TColgp_Array1OfPnt2d    pntcen;
   TColStd_Array1OfReal    par1sol;
   TColStd_Array1OfReal    par2sol;
   TColStd_Array1OfReal    pararg1;
   TColStd_Array1OfReal    pararg2;
   TColStd_Array1OfReal    parcen3;
   Standard_Boolean        Invert;
 };
 
 #endif // _Geom2dGcc_Circ2d2TanOn_HeaderFile

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