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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_Lin2dTanObl_HeaderFile
 #define _GccAna_Lin2dTanObl_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
 //! making an angle with a line.
 //! The angle is in radians.
 //! The origin of the solution is the tangency point
 //! with the first argument.
 //! Its direction is making an angle Angle with the
 //! second argument.
 class GccAna_Lin2dTanObl
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! This class implements the algorithms used to
   //! create 2d line passing through a point and
   //! making an angle with a line.
   Standard_EXPORT GccAna_Lin2dTanObl(const gp_Pnt2d& ThePoint,
                                      const gp_Lin2d& TheLine,
                                      const double    TheAngle);
 
   //! This class implements the algorithms used to
   //! create 2d line tangent to a circle and
   //! making an angle with a line.
   //! Exceptions
   //! GccEnt_BadQualifier if a qualifier is inconsistent with
   //! the argument it qualifies (for example, enclosed for a circle).
   Standard_EXPORT GccAna_Lin2dTanObl(const GccEnt_QualifiedCirc& Qualified1,
                                      const gp_Lin2d&             TheLine,
                                      const double                TheAngle);
 
   //! Returns True if the algorithm succeeded.
   //! Note: IsDone protects against a failure arising from a
   //! more internal intersection algorithm, which has reached
   //! its numeric limits.
   Standard_EXPORT bool IsDone() const;
 
   //! Returns the number of lines, representing solutions computed by this algorithm.
   //! Raises NotDone if the construction algorithm didn't succeed.
   Standard_EXPORT int NbSolutions() const;
 
   //! Returns the solution number Index.
   //! 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 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 qualifier Qualif1 of the tangency argument
   //! for the solution of index Index computed by this algorithm.
   //! The returned qualifier is:
   //! -   that specified at the start of construction when the
   //! solutions are defined as enclosing or outside with
   //! respect to the argument, or
   //! -   that computed during construction (i.e. enclosing or
   //! outside) when the solutions are defined as unqualified
   //! with respect to the argument, 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) const;
 
   //! Returns information about the tangency point between the
   //! result number Index and the first argument.
   //! ParSol is the intrinsic parameter of the point ParSol on
   //! the solution curv.
   //! ParArg is the intrinsic parameter of the point ParArg on
   //! the argument curv. 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 intersection between the
   //! result number Index and the third argument.
   //! Raises NotDone if the construction algorithm didn't succeed.
   //! It raises OutOfRange if Index is greater than the number of solutions.
   Standard_EXPORT void Intersection2(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<gp_Pnt2d>        pnttg1sol;
   NCollection_Array1<gp_Pnt2d>        pntint2sol;
   NCollection_Array1<double>          par1sol;
   NCollection_Array1<double>          par2sol;
   NCollection_Array1<double>          pararg1;
   NCollection_Array1<double>          pararg2;
 };
 
 #endif // _GccAna_Lin2dTanObl_HeaderFile

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