// 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_Circ2dTanCen_HeaderFile #define _Geom2dGcc_Circ2dTanCen_HeaderFile #include #include #include #include #include #include #include #include #include #include #include #include class Geom2dGcc_QualifiedCurve; class Geom2d_Point; class gp_Circ2d; class gp_Pnt2d; //! This class implements the algorithms used to //! create 2d circles tangent to a curve and //! centered on a point. //! The arguments of all construction methods are : //! - The qualified element for the tangency constrains //! (QualifiedCurv). //! -The center point Pcenter. //! - A real Tolerance. //! Tolerance is only used in the limits cases. //! For example : //! We want to create a circle tangent to an EnclosedCurv C1 //! with a tolerance Tolerance. //! If we did not used Tolerance it is impossible to //! find a solution in the following case : Pcenter is //! outside C1. //! With Tolerance we will give a solution if the distance //! between C1 and Pcenter is lower than or equal Tolerance/2. class Geom2dGcc_Circ2dTanCen { public: DEFINE_STANDARD_ALLOC //! Constructs one or more 2D circles tangential to the //! curve Qualified1 and centered on the point Pcenter. //! Tolerance is a tolerance criterion used by the algorithm //! to find a solution when, mathematically, the problem //! posed does not have a solution, but where there is //! numeric uncertainty attached to the arguments. //! Tolerance is only used in these algorithms in very //! specific cases where the center of the solution is very //! close to the circle to which it is tangential, and where the //! solution is thus a very small circle. //! Exceptions //! GccEnt_BadQualifier if a qualifier is inconsistent with //! the argument it qualifies (for example, enclosing for a line). Standard_EXPORT Geom2dGcc_Circ2dTanCen(const Geom2dGcc_QualifiedCurve& Qualified1, const Handle(Geom2d_Point)& Pcenter, const Standard_Real Tolerance); //! 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 circles, representing solutions //! computed by this algorithm. //! Exceptions //! StdFail_NotDone if the construction fails. Standard_EXPORT Standard_Integer NbSolutions() const; //! Returns a circle, 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_Circ2d ThisSolution (const Standard_Integer 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 enclosed, enclosing or //! outside with respect to the argument, or //! - that computed during construction (i.e. enclosed, //! enclosing or outside) when the solutions are defined //! as unqualified with respect to the 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 WhichQualifier (const Standard_Integer 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 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 true if the solution of index Index and the first //! argument of this algorithm are the same (i.e. there are 2 //! identical circles). //! If Rarg is the radius of the first 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. //! NotDone is raised if the construction algorithm didn't succeed. //! OutOfRange is raised if Index is greater than the //! number of solutions. Standard_EXPORT Standard_Boolean IsTheSame1 (const Standard_Integer Index) const; protected: private: Standard_Boolean WellDone; Standard_Integer NbrSol; TColgp_Array1OfCirc2d cirsol; GccEnt_Array1OfPosition qualifier1; TColStd_Array1OfInteger TheSame1; TColgp_Array1OfPnt2d pnttg1sol; TColStd_Array1OfReal par1sol; TColStd_Array1OfReal pararg1; }; #endif // _Geom2dGcc_Circ2dTanCen_HeaderFile