include/opencascade/BRepLProp_CLProps.hxx

0001 // Created on: 1994-02-24
0002 // Created by: Laurent BOURESCHE
0003 // Copyright (c) 1994-1999 Matra Datavision
0004 // Copyright (c) 1999-2014 OPEN CASCADE SAS
0005 //
0006 // This file is part of Open CASCADE Technology software library.
0007 //
0008 // This library is free software; you can redistribute it and/or modify it under
0009 // the terms of the GNU Lesser General Public License version 2.1 as published
0010 // by the Free Software Foundation, with special exception defined in the file
0011 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
0012 // distribution for complete text of the license and disclaimer of any warranty.
0013 //
0014 // Alternatively, this file may be used under the terms of Open CASCADE
0015 // commercial license or contractual agreement.
0016
0017 #ifndef _BRepLProp_CLProps_HeaderFile
0018 #define _BRepLProp_CLProps_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_DefineAlloc.hxx>
0022
0023 #include <BRepAdaptor_Curve.hxx>
0024 #include <gp_Pnt.hxx>
0025 #include <gp_Vec.hxx>
0026 #include <gp_Dir.hxx>
0027 #include <LProp_Status.hxx>
0028 class LProp_BadContinuity;
0029 class Standard_DomainError;
0030 class Standard_OutOfRange;
0031 class LProp_NotDefined;
0032 class BRepAdaptor_Curve;
0033 class gp_Vec;
0034 class gp_Pnt;
0035 class gp_Dir;
0036 class BRepLProp_CurveTool;
0037
0038
0039
0040 class BRepLProp_CLProps
0041 {
0042 public:
0043
0044   DEFINE_STANDARD_ALLOC
0045
0046
0047   //! Initializes the local properties of the curve <C>
0048   //! The current point and the derivatives are
0049   //! computed at the same time, which allows an
0050   //! optimization of the computation time.
0051   //! <N> indicates the maximum number of derivations to
0052   //! be done (0, 1, 2 or 3). For example, to compute
0053   //! only the tangent, N should be equal to 1.
0054   //! <Resolution> is the linear tolerance (it is used to test
0055   //! if a vector is null).
0056   Standard_EXPORT BRepLProp_CLProps(const BRepAdaptor_Curve& C, const Standard_Integer N, const Standard_Real Resolution);
0057
0058   //! Same as previous constructor but here the parameter is
0059   //! set to the value <U>.
0060   //! All the computations done will be related to <C> and <U>.
0061   Standard_EXPORT BRepLProp_CLProps(const BRepAdaptor_Curve& C, const Standard_Real U, const Standard_Integer N, const Standard_Real Resolution);
0062
0063   //! Same as previous constructor but here the parameter is
0064   //! set to the value <U> and the curve is set
0065   //! with SetCurve.
0066   //! the curve can have a empty constructor
0067   //! All the computations done will be related to <C> and <U>
0068   //! when the functions "set" will be done.
0069   Standard_EXPORT BRepLProp_CLProps(const Standard_Integer N, const Standard_Real Resolution);
0070
0071   //! Initializes the local properties of the curve
0072   //! for the parameter value <U>.
0073   Standard_EXPORT void SetParameter (const Standard_Real U);
0074
0075   //! Initializes the local properties of the curve
0076   //! for the new curve.
0077   Standard_EXPORT void SetCurve (const BRepAdaptor_Curve& C);
0078
0079   //! Returns the Point.
0080   Standard_EXPORT const gp_Pnt& Value() const;
0081
0082   //! Returns the first derivative.
0083   //! The derivative is computed if it has not been yet.
0084   Standard_EXPORT const gp_Vec& D1();
0085
0086   //! Returns the second derivative.
0087   //! The derivative is computed if it has not been yet.
0088   Standard_EXPORT const gp_Vec& D2();
0089
0090   //! Returns the third derivative.
0091   //! The derivative is computed if it has not been yet.
0092   Standard_EXPORT const gp_Vec& D3();
0093
0094   //! Returns True if the tangent is defined.
0095   //! For example, the tangent is not defined if the
0096   //! three first derivatives are all null.
0097   Standard_EXPORT Standard_Boolean IsTangentDefined();
0098
0099   //! output  the tangent direction <D>
0100   Standard_EXPORT void Tangent (gp_Dir& D);
0101
0102   //! Returns the curvature.
0103   Standard_EXPORT Standard_Real Curvature();
0104
0105   //! Returns the normal direction <N>.
0106   Standard_EXPORT void Normal (gp_Dir& N);
0107
0108   //! Returns the centre of curvature <P>.
0109   Standard_EXPORT void CentreOfCurvature (gp_Pnt& P);
0110
0111
0112
0113
0114 protected:
0115
0116
0117
0118
0119
0120 private:
0121
0122
0123
0124   BRepAdaptor_Curve myCurve;
0125   Standard_Real myU;
0126   Standard_Integer myDerOrder;
0127   Standard_Real myCN;
0128   Standard_Real myLinTol;
0129   gp_Pnt myPnt;
0130   gp_Vec myDerivArr[3];
0131   gp_Dir myTangent;
0132   Standard_Real myCurvature;
0133   LProp_Status myTangentStatus;
0134   Standard_Integer mySignificantFirstDerivativeOrder;
0135
0136
0137 };
0138
0139
0140
0141
0142
0143
0144
0145 #endif // _BRepLProp_CLProps_HeaderFile