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occt/src/Adaptor3d/Adaptor3d_Curve.hxx
ifv f4dee9bb20 0026329: Restore floating point signals handling in DRAW 
Added DRAW command dsetsignal, resetting OSD signal handler with either armed or disabled FPE handler, according to an option.
If called without arguments, it sets FPE handler only if environment variable OSD_FPE is defined (with value different from 0).
On start, DRAW calls dsetsignal to set FPE signal if CSF_FPE is defined.
Test bugs fclasses bug6143 uses dsetsignal to set FPE handler unconditionally before the test command, and resets it to default at the end.

A number of changes in the code have been done in order to fix floating point exceptions that became generated after enabling signals:

- Global functions Sinh() and Cosh() defined in Standard_Real.hxx are improved to raise Standard_NumericError exception if argument is too big (greater than 710.47586), instead of relying on system treatment of floating point overflow. These functions are used instead of sinh and cosh in ElCLib.cxx.

- Maximal value of parameter on hyperbola is restricted by 23 (corresponding to ~1e10 in 3d) in order to avoid FP overflow in Extrema_GenExtCS.cxx, ShapeFix_EdgeProjAux.cxx.

- Interface of the root curve adaptor class Adaptor3d_Curve has been updated to add new virtual methods BasisCurve and OffsetValue. They complement the adaptor for the case of offset curves. These methods are used in Extrema_GenExtCS.cxx to restrict domain search in the case of offset of hyperbola, in order to get rid of floating point overflow. All classes inheriting Adaptor3d_Curve have been changed to implement the new virtual methods.

- Protection against division by zero has been implemented in ApproxInt_KnotTools.cxx, BRepClass3d_SClassifier.cxx, BRepGProp_Face.cxx, BRepMesh_FastDiscretFace.cxx, Geom2dGcc_Circ2d2TanOnIter.cxx, Geom2dInt_Geom2dCurveTool.cxx, IntPolyh_MaillageAffinage.cxx.

- Protection against calling of math functions of infinite arguments has been added in BRepCheck_Edge.cxx, BRepLib.cxx, CSLib_NormalPolyDef.cxx, Extrema_FuncExtPC.gxx, Extrema_GExtPC.gxx, Extrema_GLocateExtPC.gxx, Intf_InterferencePolygonPolyhedron.gxx, ShapeAnalysis_Surface.cxx, ShapeAnalysis_TransferParametersProj.cxx, ShapeAnalysis_Wire.cxx, math_FunctionSetRoot.cxx.

- Proper initialization of local variables is done in BOPAlgo_PaveFiller_6.cxx, XSDRAWSTLVRML.cxx.

- Inconsistent usage of Standard_Boolean* to access integer data in HLR (caused by #27772) is corrected

Some test cases have been updated to actual state.
2016-09-30 11:17:17 +03:00

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// Created on: 1993-03-31
// Created by: Bruno DUMORTIER
// 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 _Adaptor3d_Curve_HeaderFile
#define _Adaptor3d_Curve_HeaderFile
#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>
#include <Standard_Real.hxx>
#include <GeomAbs_Shape.hxx>
#include <Standard_Integer.hxx>
#include <TColStd_Array1OfReal.hxx>
#include <Standard_Boolean.hxx>
#include <GeomAbs_CurveType.hxx>
class Standard_OutOfRange;
class Standard_NoSuchObject;
class Standard_DomainError;
class Adaptor3d_HCurve;
class gp_Pnt;
class gp_Vec;
class gp_Lin;
class gp_Circ;
class gp_Elips;
class gp_Hypr;
class gp_Parab;
class Geom_BezierCurve;
class Geom_BSplineCurve;
class Geom_OffsetCurve;
//! Root class for 3D curves on which geometric
//! algorithms work.
//! An adapted curve is an interface between the
//! services provided by a curve and those required of
//! the curve by algorithms which use it.
//! Two derived concrete classes are provided:
//! - GeomAdaptor_Curve for a curve from the Geom package
//! - Adaptor3d_CurveOnSurface for a curve lying on
//! a surface from the Geom package.
//!
//! Polynomial coefficients of BSpline curves used for their evaluation are
//! cached for better performance. Therefore these evaluations are not
//! thread-safe and parallel evaluations need to be prevented.
class Adaptor3d_Curve
{
public:
DEFINE_STANDARD_ALLOC
Standard_EXPORT virtual Standard_Real FirstParameter() const;
Standard_EXPORT virtual Standard_Real LastParameter() const;
Standard_EXPORT virtual GeomAbs_Shape Continuity() const;
//! Returns the number of intervals for continuity
//! <S>. May be one if Continuity(me) >= <S>
Standard_EXPORT virtual Standard_Integer NbIntervals (const GeomAbs_Shape S) const;
//! Stores in <T> the parameters bounding the intervals
//! of continuity <S>.
//!
//! The array must provide enough room to accomodate
//! for the parameters. i.e. T.Length() > NbIntervals()
Standard_EXPORT virtual void Intervals (TColStd_Array1OfReal& T, const GeomAbs_Shape S) const;
//! Returns a curve equivalent of <me> between
//! parameters <First> and <Last>. <Tol> is used to
//! test for 3d points confusion.
//! If <First> >= <Last>
Standard_EXPORT virtual Handle(Adaptor3d_HCurve) Trim (const Standard_Real First, const Standard_Real Last, const Standard_Real Tol) const;
Standard_EXPORT virtual Standard_Boolean IsClosed() const;
Standard_EXPORT virtual Standard_Boolean IsPeriodic() const;
Standard_EXPORT virtual Standard_Real Period() const;
//! Computes the point of parameter U on the curve.
Standard_EXPORT virtual gp_Pnt Value (const Standard_Real U) const;
//! Computes the point of parameter U on the curve.
Standard_EXPORT virtual void D0 (const Standard_Real U, gp_Pnt& P) const;
//! Computes the point of parameter U on the curve with its
//! first derivative.
//! Raised if the continuity of the current interval
//! is not C1.
Standard_EXPORT virtual void D1 (const Standard_Real U, gp_Pnt& P, gp_Vec& V) const;
//! Returns the point P of parameter U, the first and second
//! derivatives V1 and V2.
//! Raised if the continuity of the current interval
//! is not C2.
Standard_EXPORT virtual void D2 (const Standard_Real U, gp_Pnt& P, gp_Vec& V1, gp_Vec& V2) const;
//! Returns the point P of parameter U, the first, the second
//! and the third derivative.
//! Raised if the continuity of the current interval
//! is not C3.
Standard_EXPORT virtual void D3 (const Standard_Real U, gp_Pnt& P, gp_Vec& V1, gp_Vec& V2, gp_Vec& V3) const;
//! The returned vector gives the value of the derivative for the
//! order of derivation N.
//! Raised if the continuity of the current interval
//! is not CN.
//! Raised if N < 1.
Standard_EXPORT virtual gp_Vec DN (const Standard_Real U, const Standard_Integer N) const;
//! Returns the parametric resolution corresponding
//! to the real space resolution <R3d>.
Standard_EXPORT virtual Standard_Real Resolution (const Standard_Real R3d) const;
//! Returns the type of the curve in the current
//! interval : Line, Circle, Ellipse, Hyperbola,
//! Parabola, BezierCurve, BSplineCurve, OtherCurve.
Standard_EXPORT virtual GeomAbs_CurveType GetType() const;
Standard_EXPORT virtual gp_Lin Line() const;
Standard_EXPORT virtual gp_Circ Circle() const;
Standard_EXPORT virtual gp_Elips Ellipse() const;
Standard_EXPORT virtual gp_Hypr Hyperbola() const;
Standard_EXPORT virtual gp_Parab Parabola() const;
Standard_EXPORT virtual Standard_Integer Degree() const;
Standard_EXPORT virtual Standard_Boolean IsRational() const;
Standard_EXPORT virtual Standard_Integer NbPoles() const;
Standard_EXPORT virtual Standard_Integer NbKnots() const;
Standard_EXPORT virtual Handle(Geom_BezierCurve) Bezier() const;
Standard_EXPORT virtual Handle(Geom_BSplineCurve) BSpline() const;
Standard_EXPORT virtual Handle(Geom_OffsetCurve) OffsetCurve() const;
Standard_EXPORT virtual ~Adaptor3d_Curve();
protected:
private:
};
#endif // _Adaptor3d_Curve_HeaderFile
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