1 // Created on: 1996-03-12
2 // Created by: Bruno DUMORTIER
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.
18 #include <Geom2d_BezierCurve.hxx>
19 #include <Geom2d_BSplineCurve.hxx>
20 #include <Geom2dConvert_BSplineCurveToBezierCurve.hxx>
21 #include <Standard_DimensionError.hxx>
22 #include <Standard_DomainError.hxx>
23 #include <Standard_OutOfRange.hxx>
24 #include <TColgp_Array1OfPnt2d.hxx>
25 #include <TColStd_Array1OfReal.hxx>
27 //=======================================================================
28 //function : Geom2dConvert_BSplineCurveToBezierCurve
30 //=======================================================================
31 Geom2dConvert_BSplineCurveToBezierCurve::Geom2dConvert_BSplineCurveToBezierCurve (const Handle(Geom2d_BSplineCurve)& BasisCurve)
33 myCurve = Handle(Geom2d_BSplineCurve)::DownCast(BasisCurve->Copy());
34 // periodic curve can't be converted correctly by two main reasons:
35 // last pole (equal to first one) is missing;
36 // poles recomputation using default boor scheme is fails.
37 if(myCurve->IsPeriodic()) myCurve->SetNotPeriodic();
38 Standard_Real Uf = myCurve->FirstParameter();
39 Standard_Real Ul = myCurve->LastParameter();
40 myCurve->Segment(Uf,Ul);
41 myCurve->IncreaseMultiplicity(myCurve->FirstUKnotIndex(),
42 myCurve->LastUKnotIndex(),
47 //=======================================================================
48 //function : Geom2dConvert_BSplineCurveToBezierCurve
50 //=======================================================================
52 Geom2dConvert_BSplineCurveToBezierCurve::Geom2dConvert_BSplineCurveToBezierCurve
53 (const Handle(Geom2d_BSplineCurve)& BasisCurve,
54 const Standard_Real U1,
55 const Standard_Real U2,
56 const Standard_Real ParametricTolerance)
58 if (U2 - U1 < ParametricTolerance)
59 Standard_DomainError::Raise("GeomConvert_BSplineCurveToBezierSurface");
61 Standard_Real Uf = U1, Ul = U2;
62 Standard_Real PTol = ParametricTolerance/2 ;
64 Standard_Integer I1, I2;
65 myCurve = Handle(Geom2d_BSplineCurve)::DownCast(BasisCurve->Copy());
66 if(myCurve->IsPeriodic()) myCurve->SetNotPeriodic();
68 myCurve->LocateU(U1, PTol, I1, I2);
69 if (I1==I2) { // On est sur le noeud
70 if ( myCurve->Knot(I1) > U1) Uf = myCurve->Knot(I1);
73 myCurve->LocateU(U2, PTol, I1, I2);
74 if (I1==I2) { // On est sur le noeud
75 if ( myCurve->Knot(I1) < U2) Ul = myCurve->Knot(I1);
79 myCurve->Segment(Uf, Ul);
80 myCurve->IncreaseMultiplicity(myCurve->FirstUKnotIndex(),
81 myCurve->LastUKnotIndex(),
86 //=======================================================================
89 //=======================================================================
91 Handle(Geom2d_BezierCurve) Geom2dConvert_BSplineCurveToBezierCurve::Arc
92 (const Standard_Integer Index)
94 if ( Index < 1 || Index > myCurve->NbKnots()-1) {
95 Standard_OutOfRange::Raise("Geom2dConvert_BSplineCurveToBezierCurve");
97 Standard_Integer Deg = myCurve->Degree();
99 TColgp_Array1OfPnt2d Poles(1,Deg+1);
101 Handle(Geom2d_BezierCurve) C;
102 if ( myCurve->IsRational()) {
103 TColStd_Array1OfReal Weights(1,Deg+1);
104 for ( Standard_Integer i = 1; i <= Deg+1; i++) {
105 Poles(i) = myCurve->Pole(i+Deg*(Index-1));
106 Weights(i) = myCurve->Weight(i+Deg*(Index-1));
108 C = new Geom2d_BezierCurve(Poles,Weights);
111 for ( Standard_Integer i = 1; i <= Deg+1; i++) {
112 Poles(i) = myCurve->Pole(i+Deg*(Index-1));
114 C = new Geom2d_BezierCurve(Poles);
120 //=======================================================================
123 //=======================================================================
125 void Geom2dConvert_BSplineCurveToBezierCurve::Arcs
126 (TColGeom2d_Array1OfBezierCurve& Curves)
128 Standard_Integer n = NbArcs();
129 for ( Standard_Integer i = 1; i <= n; i++) {
134 //=======================================================================
137 //=======================================================================
139 void Geom2dConvert_BSplineCurveToBezierCurve::Knots
140 (TColStd_Array1OfReal& TKnots) const
142 Standard_Integer ii, kk;
143 for (ii = 1, kk = TKnots.Lower();
144 ii <=myCurve->NbKnots(); ii++, kk++)
145 TKnots(kk) = myCurve->Knot(ii);
148 //=======================================================================
151 //=======================================================================
153 Standard_Integer Geom2dConvert_BSplineCurveToBezierCurve::NbArcs() const
155 return (myCurve->NbKnots()-1);