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// File: Geom2dConvert_BSplineCurveToBezierCurve.cxx
// Created: Tue Mar 12 15:51:42 1996
// Author: Bruno DUMORTIER
// <dub@fuegox>
#include <Geom2dConvert_BSplineCurveToBezierCurve.ixx>
#include <TColgp_Array1OfPnt2d.hxx>
#include <TColStd_Array1OfReal.hxx>
//=======================================================================
//function : Geom2dConvert_BSplineCurveToBezierCurve
//purpose :
//=======================================================================
Geom2dConvert_BSplineCurveToBezierCurve::Geom2dConvert_BSplineCurveToBezierCurve (const Handle(Geom2d_BSplineCurve)& BasisCurve)
{
myCurve = Handle(Geom2d_BSplineCurve)::DownCast(BasisCurve->Copy());
// periodic curve can't be converted correctly by two main reasons:
// last pole (equal to first one) is missing;
// poles recomputation using default boor scheme is fails.
if(myCurve->IsPeriodic()) myCurve->SetNotPeriodic();
Standard_Real Uf = myCurve->FirstParameter();
Standard_Real Ul = myCurve->LastParameter();
myCurve->Segment(Uf,Ul);
myCurve->IncreaseMultiplicity(myCurve->FirstUKnotIndex(),
myCurve->LastUKnotIndex(),
myCurve->Degree());
}
//=======================================================================
//function : Geom2dConvert_BSplineCurveToBezierCurve
//purpose :
//=======================================================================
Geom2dConvert_BSplineCurveToBezierCurve::Geom2dConvert_BSplineCurveToBezierCurve
(const Handle(Geom2d_BSplineCurve)& BasisCurve,
const Standard_Real U1,
const Standard_Real U2,
const Standard_Real ParametricTolerance)
{
if (U2 - U1 < ParametricTolerance)
Standard_DomainError::Raise("GeomConvert_BSplineCurveToBezierSurface");
Standard_Real Uf = U1, Ul = U2;
Standard_Real PTol = ParametricTolerance/2 ;
Standard_Integer I1, I2;
myCurve = Handle(Geom2d_BSplineCurve)::DownCast(BasisCurve->Copy());
if(myCurve->IsPeriodic()) myCurve->SetNotPeriodic();
myCurve->LocateU(U1, PTol, I1, I2);
if (I1==I2) { // On est sur le noeud
if ( myCurve->Knot(I1) > U1) Uf = myCurve->Knot(I1);
}
myCurve->LocateU(U2, PTol, I1, I2);
if (I1==I2) { // On est sur le noeud
if ( myCurve->Knot(I1) < U2) Ul = myCurve->Knot(I1);
}
myCurve->Segment(Uf, Ul);
myCurve->IncreaseMultiplicity(myCurve->FirstUKnotIndex(),
myCurve->LastUKnotIndex(),
myCurve->Degree());
}
//=======================================================================
//function : Arc
//purpose :
//=======================================================================
Handle(Geom2d_BezierCurve) Geom2dConvert_BSplineCurveToBezierCurve::Arc
(const Standard_Integer Index)
{
if ( Index < 1 || Index > myCurve->NbKnots()-1) {
Standard_OutOfRange::Raise("Geom2dConvert_BSplineCurveToBezierCurve");
}
Standard_Integer Deg = myCurve->Degree();
TColgp_Array1OfPnt2d Poles(1,Deg+1);
Handle(Geom2d_BezierCurve) C;
if ( myCurve->IsRational()) {
TColStd_Array1OfReal Weights(1,Deg+1);
for ( Standard_Integer i = 1; i <= Deg+1; i++) {
Poles(i) = myCurve->Pole(i+Deg*(Index-1));
Weights(i) = myCurve->Weight(i+Deg*(Index-1));
}
C = new Geom2d_BezierCurve(Poles,Weights);
}
else {
for ( Standard_Integer i = 1; i <= Deg+1; i++) {
Poles(i) = myCurve->Pole(i+Deg*(Index-1));
}
C = new Geom2d_BezierCurve(Poles);
}
return C;
}
//=======================================================================
//function : Arcs
//purpose :
//=======================================================================
void Geom2dConvert_BSplineCurveToBezierCurve::Arcs
(TColGeom2d_Array1OfBezierCurve& Curves)
{
Standard_Integer n = NbArcs();
for ( Standard_Integer i = 1; i <= n; i++) {
Curves(i) = Arc(i);
}
}
//=======================================================================
//function : Knots
//purpose :
//=======================================================================
void Geom2dConvert_BSplineCurveToBezierCurve::Knots
(TColStd_Array1OfReal& TKnots) const
{
Standard_Integer ii, kk;
for (ii = 1, kk = TKnots.Lower();
ii <=myCurve->NbKnots(); ii++, kk++)
TKnots(kk) = myCurve->Knot(ii);
}
//=======================================================================
//function : NbArcs
//purpose :
//=======================================================================
Standard_Integer Geom2dConvert_BSplineCurveToBezierCurve::NbArcs() const
{
return (myCurve->NbKnots()-1);
}
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