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[occt.git] / src / Geom2dConvert / Geom2dConvert_BSplineCurveToBezierCurve.hxx
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42cf5bc1 1// Created on: 1993-03-24
2// Created by: DUB
3// Copyright (c) 1993-1999 Matra Datavision
4// Copyright (c) 1999-2014 OPEN CASCADE SAS
5//
6// This file is part of Open CASCADE Technology software library.
7//
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.
13//
14// Alternatively, this file may be used under the terms of Open CASCADE
15// commercial license or contractual agreement.
16
17#ifndef _Geom2dConvert_BSplineCurveToBezierCurve_HeaderFile
18#define _Geom2dConvert_BSplineCurveToBezierCurve_HeaderFile
19
20#include <Standard.hxx>
21#include <Standard_DefineAlloc.hxx>
22#include <Standard_Handle.hxx>
23
24#include <Standard_Real.hxx>
25#include <Standard_Integer.hxx>
26#include <TColGeom2d_Array1OfBezierCurve.hxx>
27#include <TColStd_Array1OfReal.hxx>
28class Geom2d_BSplineCurve;
29class Standard_DimensionError;
30class Standard_DomainError;
31class Standard_OutOfRange;
32class Geom2d_BezierCurve;
33
34
35//! An algorithm to convert a BSpline curve into a series
36//! of adjacent Bezier curves.
37//! A BSplineCurveToBezierCurve object provides a framework for:
38//! - defining the BSpline curve to be converted
39//! - implementing the construction algorithm, and
40//! - consulting the results.
41//! References :
42//! Generating the Bezier points of B-spline curves and surfaces
43//! (Wolfgang Bohm) CAD volume 13 number 6 november 1981
44class Geom2dConvert_BSplineCurveToBezierCurve
45{
46public:
47
48 DEFINE_STANDARD_ALLOC
49
50
51 //! Computes all the data needed to convert
52 //! - the BSpline curve BasisCurve, into a series of adjacent Bezier arcs.
53 //! The result consists of a series of BasisCurve arcs
54 //! limited by points corresponding to knot values of the curve.
55 //! Use the available interrogation functions to ascertain
56 //! the number of computed Bezier arcs, and then to
57 //! construct each individual Bezier curve (or all Bezier curves).
58 //! Note: ParametricTolerance is not used.
59 Standard_EXPORT Geom2dConvert_BSplineCurveToBezierCurve(const Handle(Geom2d_BSplineCurve)& BasisCurve);
60
61 //! Computes all the data needed to convert
62 //! the portion of the BSpline curve BasisCurve
63 //! limited by the two parameter values U1 and U2
64 //! for Example if there is a Knot Uk and
65 //! Uk < U < Uk + ParametricTolerance/2 the last curve
66 //! corresponds to the span [Uk-1, Uk] and not to [Uk, Uk+1]
67 //! The result consists of a series of BasisCurve arcs
68 //! limited by points corresponding to knot values of the curve.
69 //! Use the available interrogation functions to ascertain
70 //! the number of computed Bezier arcs, and then to
71 //! construct each individual Bezier curve (or all Bezier curves).
72 //! Note: ParametricTolerance is not used.
73 //! Raises DomainError if U1 or U2 are out of the parametric bounds of the basis
74 //! curve [FirstParameter, LastParameter]. The Tolerance criterion
75 //! is ParametricTolerance.
76 //! Raised if Abs (U2 - U1) <= ParametricTolerance.
77 Standard_EXPORT Geom2dConvert_BSplineCurveToBezierCurve(const Handle(Geom2d_BSplineCurve)& BasisCurve, const Standard_Real U1, const Standard_Real U2, const Standard_Real ParametricTolerance);
78
79 //! Constructs and returns the Bezier curve of index
80 //! Index to the table of adjacent Bezier arcs
81 //! computed by this algorithm.
82 //! This Bezier curve has the same orientation as the
83 //! BSpline curve analyzed in this framework.
84 //! Exceptions
85 //! Standard_OutOfRange if Index is less than 1 or
86 //! greater than the number of adjacent Bezier arcs
87 //! computed by this algorithm.
88 Standard_EXPORT Handle(Geom2d_BezierCurve) Arc (const Standard_Integer Index);
89
90 //! Constructs all the Bezier curves whose data is
91 //! computed by this algorithm and loads these curves
92 //! into the Curves table.
93 //! The Bezier curves have the same orientation as the
94 //! BSpline curve analyzed in this framework.
95 //! Exceptions
96 //! Standard_DimensionError if the Curves array was
97 //! not created with the following bounds:
98 //! - 1 , and
99 //! - the number of adjacent Bezier arcs computed by
100 //! this algorithm (as given by the function NbArcs).
101 Standard_EXPORT void Arcs (TColGeom2d_Array1OfBezierCurve& Curves);
102
103 //! This methode returns the bspline's knots associated to
104 //! the converted arcs
105 //! Raises DimensionError if the length of Curves is not equal to
106 //! NbArcs + 1
107 Standard_EXPORT void Knots (TColStd_Array1OfReal& TKnots) const;
108
109
110 //! Returns the number of BezierCurve arcs.
111 //! If at the creation time you have decomposed the basis curve
112 //! between the parametric values UFirst, ULast the number of
113 //! BezierCurve arcs depends on the number of knots included inside
114 //! the interval [UFirst, ULast].
115 //! If you have decomposed the whole basis B-spline curve the number
116 //! of BezierCurve arcs NbArcs is equal to the number of knots less
117 //! one.
118 Standard_EXPORT Standard_Integer NbArcs() const;
119
120
121
122
123protected:
124
125
126
127
128
129private:
130
131
132
133 Handle(Geom2d_BSplineCurve) myCurve;
134
135
136};
137
138
139
140
141
142
143
144#endif // _Geom2dConvert_BSplineCurveToBezierCurve_HeaderFile