1 // Created on: 1995-07-17
2 // Created by: Laurent BUCHARD
3 // Copyright (c) 1995-1999 Matra Datavision
4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
6 // This file is part of Open CASCADE Technology software library.
8 // This library is free software; you can redistribute it and/or modify it under
9 // the terms of the GNU Lesser General Public License version 2.1 as published
10 // by the Free Software Foundation, with special exception defined in the file
11 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
12 // distribution for complete text of the license and disclaimer of any warranty.
14 // Alternatively, this file may be used under the terms of Open CASCADE
15 // commercial license or contractual agreement.
17 #ifndef _BRepBlend_HCurveTool_HeaderFile
18 #define _BRepBlend_HCurveTool_HeaderFile
20 #include <Adaptor3d_Curve.hxx>
21 #include <GeomAbs_CurveType.hxx>
22 #include <GeomAbs_Shape.hxx>
23 #include <gp_Circ.hxx>
24 #include <gp_Elips.hxx>
26 #include <gp_Parab.hxx>
29 #include <gp_Hypr.hxx>
30 #include <TColStd_Array1OfReal.hxx>
32 class BRepBlend_HCurveTool
39 static Standard_Real FirstParameter (const Handle(Adaptor3d_Curve)& C);
41 static Standard_Real LastParameter (const Handle(Adaptor3d_Curve)& C);
43 static GeomAbs_Shape Continuity (const Handle(Adaptor3d_Curve)& C);
45 //! Returns the number of intervals for continuity
46 //! <S>. May be one if Continuity(myclass) >= <S>
47 static Standard_Integer NbIntervals (const Handle(Adaptor3d_Curve)& C, const GeomAbs_Shape S);
49 //! Stores in <T> the parameters bounding the intervals
50 //! of continuity <S>.
52 //! The array must provide enough room to accommodate
53 //! for the parameters. i.e. T.Length() > NbIntervals()
54 static void Intervals (const Handle(Adaptor3d_Curve)& C, TColStd_Array1OfReal& T, const GeomAbs_Shape S);
56 static Standard_Boolean IsClosed (const Handle(Adaptor3d_Curve)& C);
58 static Standard_Boolean IsPeriodic (const Handle(Adaptor3d_Curve)& C);
60 static Standard_Real Period (const Handle(Adaptor3d_Curve)& C);
62 //! Computes the point of parameter U on the curve.
63 static gp_Pnt Value (const Handle(Adaptor3d_Curve)& C, const Standard_Real U);
65 //! Computes the point of parameter U on the curve.
66 static void D0 (const Handle(Adaptor3d_Curve)& C, const Standard_Real U, gp_Pnt& P);
68 //! Computes the point of parameter U on the curve with its
70 //! Raised if the continuity of the current interval
72 static void D1 (const Handle(Adaptor3d_Curve)& C, const Standard_Real U, gp_Pnt& P, gp_Vec& V);
75 //! Returns the point P of parameter U, the first and second
76 //! derivatives V1 and V2.
77 //! Raised if the continuity of the current interval
79 static void D2 (const Handle(Adaptor3d_Curve)& C, const Standard_Real U, gp_Pnt& P, gp_Vec& V1, gp_Vec& V2);
82 //! Returns the point P of parameter U, the first, the second
83 //! and the third derivative.
84 //! Raised if the continuity of the current interval
86 static void D3 (const Handle(Adaptor3d_Curve)& C, const Standard_Real U, gp_Pnt& P, gp_Vec& V1, gp_Vec& V2, gp_Vec& V3);
89 //! The returned vector gives the value of the derivative for the
90 //! order of derivation N.
91 //! Raised if the continuity of the current interval
94 static gp_Vec DN (const Handle(Adaptor3d_Curve)& C, const Standard_Real U, const Standard_Integer N);
96 //! Returns the parametric resolution corresponding
97 //! to the real space resolution <R3d>.
98 static Standard_Real Resolution (const Handle(Adaptor3d_Curve)& C, const Standard_Real R3d);
100 //! Returns the type of the curve in the current
101 //! interval : Line, Circle, Ellipse, Hyperbola,
102 //! Parabola, BezierCurve, BSplineCurve, OtherCurve.
103 static GeomAbs_CurveType GetType (const Handle(Adaptor3d_Curve)& C);
105 static gp_Lin Line (const Handle(Adaptor3d_Curve)& C);
107 static gp_Circ Circle (const Handle(Adaptor3d_Curve)& C);
109 static gp_Elips Ellipse (const Handle(Adaptor3d_Curve)& C);
111 static gp_Hypr Hyperbola (const Handle(Adaptor3d_Curve)& C);
113 static gp_Parab Parabola (const Handle(Adaptor3d_Curve)& C);
115 static Handle(Geom_BezierCurve) Bezier (const Handle(Adaptor3d_Curve)& C);
117 static Handle(Geom_BSplineCurve) BSpline (const Handle(Adaptor3d_Curve)& C);
119 Standard_EXPORT static Standard_Integer NbSamples (const Handle(Adaptor3d_Curve)& C, const Standard_Real U0, const Standard_Real U1);
139 #include <BRepBlend_HCurveTool.lxx>
145 #endif // _BRepBlend_HCurveTool_HeaderFile