// Created on: 1993-07-09 // Created by: Isabelle GRIGNON // Copyright (c) 1993-1999 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 _BndLib_Add2dCurve_HeaderFile #define _BndLib_Add2dCurve_HeaderFile #include #include #include class Adaptor2d_Curve2d; class Bnd_Box2d; class Geom2d_Curve; //! Computes the bounding box for a curve in 2d . //! Functions to add a 2D curve to a bounding box. //! The 2D curve is defined from a Geom2d curve. class BndLib_Add2dCurve { public: DEFINE_STANDARD_ALLOC //! Adds to the bounding box B the curve C //! B is then enlarged by the tolerance value Tol. //! Note: depending on the type of curve, one of the following //! representations of the curve C is used to include it in the bounding box B: //! - an exact representation if C is built from a line, a circle or a conic curve, //! - the poles of the curve if C is built from a Bezier curve or a BSpline curve, //! - if not, the points of an approximation of the curve C. //! Warning //! C is an adapted curve, that is, an object which is an interface between: //! - the services provided by a 2D curve from the package Geom2d //! - and those required of the curve by the computation algorithm. //! The adapted curve is created in the following way: //! Handle(Geom2d_Curve) mycurve = ... //! ; //! Geom2dAdaptor_Curve C(mycurve); //! The bounding box B is then enlarged by adding it: //! Bnd_Box2d B; //! // ... //! Standard_Real Tol = ... ; //! Add2dCurve::Add ( C, Tol, B ); //! Exceptions //! Standard_Failure if the curve is built from: //! - a Geom_Line, or //! - a Geom_Parabola, or //! - a Geom_Hyperbola, //! and P1 and P2 are either two negative infinite real //! numbers, or two positive infinite real numbers. Standard_EXPORT static void Add (const Adaptor2d_Curve2d& C, const Standard_Real Tol, Bnd_Box2d& B); //! Adds to the bounding box Bthe arc of the curve C limited by the two parameter //! values P1 and P2. //! B is then enlarged by the tolerance value Tol. //! Note: depending on the type of curve, one of the following //! representations of the curve C is used to include it in the bounding box B: //! - an exact representation if C is built from a line, a circle or a conic curve, //! - the poles of the curve if C is built from a Bezier curve or a BSpline curve, //! - if not, the points of an approximation of the curve C. //! Warning //! C is an adapted curve, that is, an object which is an interface between: //! - the services provided by a 2D curve from the package Geom2d //! - and those required of the curve by the computation algorithm. //! The adapted curve is created in the following way: //! Handle(Geom2d_Curve) mycurve = ... //! ; //! Geom2dAdaptor_Curve C(mycurve); //! The bounding box B is then enlarged by adding it: //! Bnd_Box2d B; //! // ... //! Standard_Real Tol = ... ; //! Add2dCurve::Add ( C, Tol, B ); //! Exceptions //! Standard_Failure if the curve is built from: //! - a Geom_Line, or //! - a Geom_Parabola, or //! - a Geom_Hyperbola, //! and P1 and P2 are either two negative infinite real //! numbers, or two positive infinite real numbers. Standard_EXPORT static void Add (const Adaptor2d_Curve2d& C, const Standard_Real U1, const Standard_Real U2, const Standard_Real Tol, Bnd_Box2d& B); //! Adds to the bounding box B the curve C //! B is then enlarged by the tolerance value Tol. //! Note: depending on the type of curve, one of the following //! representations of the curve C is used to include it in the bounding box B: //! - an exact representation if C is built from a line, a circle or a conic curve, //! - the poles of the curve if C is built from a Bezier curve or a BSpline curve, //! - if not, the points of an approximation of the curve C. Standard_EXPORT static void Add (const Handle(Geom2d_Curve)& C, const Standard_Real Tol, Bnd_Box2d& Box); //! Adds to the bounding box B the part of curve C //! B is then enlarged by the tolerance value Tol. //! U1, U2 - the parametric range to compute the bounding box; //! Note: depending on the type of curve, one of the following //! representations of the curve C is used to include it in the bounding box B: //! - an exact representation if C is built from a line, a circle or a conic curve, //! - the poles of the curve if C is built from a Bezier curve or a BSpline curve, //! - if not, the points of an approximation of the curve C. Standard_EXPORT static void Add (const Handle(Geom2d_Curve)& C, const Standard_Real U1, const Standard_Real U2, const Standard_Real Tol, Bnd_Box2d& B); //! Adds to the bounding box B the part of curve C //! B is then enlarged by the tolerance value Tol. //! U1, U2 - the parametric range to compute the bounding box; //! Note: depending on the type of curve, one of the following //! algorithms is used to include it in the bounding box B: //! - an exact analytical if C is built from a line, a circle or a conic curve, //! - numerical calculation of bounding box sizes, based on minimization algorithm, for other types of curve //! If Tol = < Precision::PConfusion(), Precision::PConfusion is used as tolerance for calculation Standard_EXPORT static void AddOptimal(const Handle(Geom2d_Curve)& C, const Standard_Real U1, const Standard_Real U2, const Standard_Real Tol, Bnd_Box2d& B); protected: private: }; #endif // _BndLib_Add2dCurve_HeaderFile