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 <Geom_BezierCurve.hxx>
22 #include <Geom_BSplineCurve.hxx>
23 #include <GeomAbs_CurveType.hxx>
24 #include <GeomAbs_Shape.hxx>
25 #include <gp_Circ.hxx>
26 #include <gp_Elips.hxx>
28 #include <gp_Parab.hxx>
31 #include <gp_Hypr.hxx>
32 #include <TColStd_Array1OfReal.hxx>
34 class BRepBlend_HCurveTool
41 static Standard_Real FirstParameter (const Handle(Adaptor3d_Curve)& C);
43 static Standard_Real LastParameter (const Handle(Adaptor3d_Curve)& C);
45 static GeomAbs_Shape Continuity (const Handle(Adaptor3d_Curve)& C);
47 //! Returns the number of intervals for continuity
48 //! <S>. May be one if Continuity(myclass) >= <S>
49 static Standard_Integer NbIntervals (const Handle(Adaptor3d_Curve)& C, const GeomAbs_Shape S);
51 //! Stores in <T> the parameters bounding the intervals
52 //! of continuity <S>.
54 //! The array must provide enough room to accommodate
55 //! for the parameters. i.e. T.Length() > NbIntervals()
56 static void Intervals (const Handle(Adaptor3d_Curve)& C, TColStd_Array1OfReal& T, const GeomAbs_Shape S);
58 static Standard_Boolean IsClosed (const Handle(Adaptor3d_Curve)& C);
60 static Standard_Boolean IsPeriodic (const Handle(Adaptor3d_Curve)& C);
62 static Standard_Real Period (const Handle(Adaptor3d_Curve)& C);
64 //! Computes the point of parameter U on the curve.
65 static gp_Pnt Value (const Handle(Adaptor3d_Curve)& C, const Standard_Real U);
67 //! Computes the point of parameter U on the curve.
68 static void D0 (const Handle(Adaptor3d_Curve)& C, const Standard_Real U, gp_Pnt& P);
70 //! Computes the point of parameter U on the curve with its
72 //! Raised if the continuity of the current interval
74 static void D1 (const Handle(Adaptor3d_Curve)& C, const Standard_Real U, gp_Pnt& P, gp_Vec& V);
77 //! Returns the point P of parameter U, the first and second
78 //! derivatives V1 and V2.
79 //! Raised if the continuity of the current interval
81 static void D2 (const Handle(Adaptor3d_Curve)& C, const Standard_Real U, gp_Pnt& P, gp_Vec& V1, gp_Vec& V2);
84 //! Returns the point P of parameter U, the first, the second
85 //! and the third derivative.
86 //! Raised if the continuity of the current interval
88 static void D3 (const Handle(Adaptor3d_Curve)& C, const Standard_Real U, gp_Pnt& P, gp_Vec& V1, gp_Vec& V2, gp_Vec& V3);
91 //! The returned vector gives the value of the derivative for the
92 //! order of derivation N.
93 //! Raised if the continuity of the current interval
96 static gp_Vec DN (const Handle(Adaptor3d_Curve)& C, const Standard_Real U, const Standard_Integer N);
98 //! Returns the parametric resolution corresponding
99 //! to the real space resolution <R3d>.
100 static Standard_Real Resolution (const Handle(Adaptor3d_Curve)& C, const Standard_Real R3d);
102 //! Returns the type of the curve in the current
103 //! interval : Line, Circle, Ellipse, Hyperbola,
104 //! Parabola, BezierCurve, BSplineCurve, OtherCurve.
105 static GeomAbs_CurveType GetType (const Handle(Adaptor3d_Curve)& C);
107 static gp_Lin Line (const Handle(Adaptor3d_Curve)& C);
109 static gp_Circ Circle (const Handle(Adaptor3d_Curve)& C);
111 static gp_Elips Ellipse (const Handle(Adaptor3d_Curve)& C);
113 static gp_Hypr Hyperbola (const Handle(Adaptor3d_Curve)& C);
115 static gp_Parab Parabola (const Handle(Adaptor3d_Curve)& C);
117 static Handle(Geom_BezierCurve) Bezier (const Handle(Adaptor3d_Curve)& C);
119 static Handle(Geom_BSplineCurve) BSpline (const Handle(Adaptor3d_Curve)& C);
121 Standard_EXPORT static Standard_Integer NbSamples (const Handle(Adaptor3d_Curve)& C, const Standard_Real U0, const Standard_Real U1);
141 #include <BRepBlend_HCurveTool.lxx>
147 #endif // _BRepBlend_HCurveTool_HeaderFile