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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_Lin2d2Tan_HeaderFile
 #define _Geom2dGcc_Lin2d2Tan_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
 #include <Standard_Integer.hxx>
 #include <TColgp_Array1OfLin2d.hxx>
 #include <GccEnt_Array1OfPosition.hxx>
 #include <TColgp_Array1OfPnt2d.hxx>
 #include <TColStd_Array1OfReal.hxx>
 #include <GccEnt_Position.hxx>
 class Geom2dGcc_QualifiedCurve;
 class gp_Pnt2d;
 class gp_Lin2d;
 class Geom2dGcc_Lin2d2TanIter;
 class Geom2dAdaptor_Curve;
 
 //! This class implements the algorithms used to
 //! create 2d lines tangent to 2 other elements which
 //! can be circles, curves or points.
 //! More than one argument must be a curve.
 //! Describes functions for building a 2D line:
 //! -   tangential to 2 curves, or
 //! -   tangential to a curve and passing through a point.
 //! A Lin2d2Tan object provides a framework for:
 //! -   defining the construction of 2D line(s),
 //! -   implementing the construction algorithm, and
 //! -   consulting the result(s).
 //!
 //! Note: Some constructors may check the type of the qualified argument
 //! and raise BadQualifier Error in case of incorrect couple (qualifier, curv).
 class Geom2dGcc_Lin2d2Tan
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! This class implements the algorithms used to create 2d
   //! line tangent to two curves.
   //! Tolang is used to determine the tolerance for the tangency points.
   Standard_EXPORT Geom2dGcc_Lin2d2Tan(const Geom2dGcc_QualifiedCurve& Qualified1,
                                       const Geom2dGcc_QualifiedCurve& Qualified2,
                                       const Standard_Real             Tolang);
 
   //! This class implements the algorithms used to create 2d
   //! lines passing through a point and tangent to a curve.
   //! Tolang is used to determine the tolerance for the tangency points.
   Standard_EXPORT Geom2dGcc_Lin2d2Tan(const Geom2dGcc_QualifiedCurve& Qualified1,
                                       const gp_Pnt2d&                 ThePoint,
                                       const Standard_Real             Tolang);
 
   //! This class implements the algorithms used to create 2d
   //! line tangent to two curves.
   //! Tolang is used to determine the tolerance for the tangency points.
   //! Param1 is used for the initial guess on the first curve.
   //! Param2 is used for the initial guess on the second curve.
   Standard_EXPORT Geom2dGcc_Lin2d2Tan(const Geom2dGcc_QualifiedCurve& Qualified1,
                                       const Geom2dGcc_QualifiedCurve& Qualified2,
                                       const Standard_Real             Tolang,
                                       const Standard_Real             Param1,
                                       const Standard_Real             Param2);
 
   //! This class implements the algorithms used to create 2d
   //! lines passing through a point and tangent to a curve.
   //! Tolang is used to determine the tolerance for the tangency points.
   //! Param2 is used for the initial guess on the curve.
   Standard_EXPORT Geom2dGcc_Lin2d2Tan(const Geom2dGcc_QualifiedCurve& Qualified1,
                                       const gp_Pnt2d&                 ThePoint,
                                       const Standard_Real             Tolang,
                                       const Standard_Real             Param1);
 
   //! 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;
 
   //! Returns the number of lines, representing solutions computed by this algorithm.
   //! Exceptions StdFail_NotDone if the construction fails.R
   Standard_EXPORT Standard_Integer NbSolutions() const;
 
   //! Returns a line, representing the solution of index Index computed by this algorithm.
   //! Warning
   //! This indexing simply provides a means of consulting the
   //! solutions. The index values are not associated with
   //! these solutions outside the context of the algorithm object.
   //! 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 gp_Lin2d ThisSolution(const Standard_Integer 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 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.
   //! 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 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 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.
   //! 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 Tangency2(const Standard_Integer Index,
                                  Standard_Real&         ParSol,
                                  Standard_Real&         ParArg,
                                  gp_Pnt2d&              PntSol) const;
 
 protected:
 private:
   Standard_EXPORT Standard_Boolean Add(const Standard_Integer         theIndex,
                                        const Geom2dGcc_Lin2d2TanIter& theLin,
                                        const Standard_Real            theTol,
                                        const Geom2dAdaptor_Curve&     theC1,
                                        const Geom2dAdaptor_Curve&     theC2);
 
   Standard_Boolean        WellDone;
   Standard_Integer        NbrSol;
   TColgp_Array1OfLin2d    linsol;
   GccEnt_Array1OfPosition qualifier1;
   GccEnt_Array1OfPosition qualifier2;
   TColgp_Array1OfPnt2d    pnttg1sol;
   TColgp_Array1OfPnt2d    pnttg2sol;
   TColStd_Array1OfReal    par1sol;
   TColStd_Array1OfReal    par2sol;
   TColStd_Array1OfReal    pararg1;
   TColStd_Array1OfReal    pararg2;
 };
 
 #endif // _Geom2dGcc_Lin2d2Tan_HeaderFile

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