--- /dev/null
+// 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 <Standard.hxx>
+#include <Standard_DefineAlloc.hxx>
+#include <Standard_Handle.hxx>
+
+#include <Standard_Boolean.hxx>
+#include <Standard_Integer.hxx>
+#include <TColgp_Array1OfCirc2d.hxx>
+#include <GccEnt_Array1OfPosition.hxx>
+#include <TColStd_Array1OfInteger.hxx>
+#include <TColgp_Array1OfPnt2d.hxx>
+#include <TColStd_Array1OfReal.hxx>
+#include <Standard_Real.hxx>
+#include <GccEnt_Position.hxx>
+class Standard_OutOfRange;
+class GccEnt_BadQualifier;
+class StdFail_NotDone;
+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 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 informations 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
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