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occt/src/GeomConvert/GeomConvert_BSplineCurveToBezierCurve.cxx

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4.8 KiB
C++

// Created on: 1996-03-12
// Created by: Bruno DUMORTIER
// Copyright (c) 1995-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.
#include <Geom_BezierCurve.hxx>
#include <Geom_BSplineCurve.hxx>
#include <GeomConvert_BSplineCurveToBezierCurve.hxx>
#include <Standard_DomainError.hxx>
#include <Standard_OutOfRange.hxx>
#include <TColgp_Array1OfPnt.hxx>
#include <TColStd_Array1OfReal.hxx>
//=======================================================================
//function : GeomConvert_BSplineCurveToBezierCurve
//purpose :
//=======================================================================
GeomConvert_BSplineCurveToBezierCurve::GeomConvert_BSplineCurveToBezierCurve (const Handle(Geom_BSplineCurve)& BasisCurve)
{
myCurve = Handle(Geom_BSplineCurve)::DownCast(BasisCurve->Copy());
Standard_Real Uf = myCurve->FirstParameter();
Standard_Real Ul = myCurve->LastParameter();
myCurve->Segment(Uf,Ul);
myCurve->IncreaseMultiplicity(myCurve->FirstUKnotIndex(),
myCurve->LastUKnotIndex(),
myCurve->Degree());
}
//=======================================================================
//function : GeomConvert_BSplineCurveToBezierCurve
//purpose :
// 01/12/1997 PMN: On elimine d'eventuelles micro-courbe PRO11516
//=======================================================================Real I
GeomConvert_BSplineCurveToBezierCurve::GeomConvert_BSplineCurveToBezierCurve
(const Handle(Geom_BSplineCurve)& BasisCurve,
const Standard_Real U1,
const Standard_Real U2,
const Standard_Real ParametricTolerance)
{
if (U2 - U1 < ParametricTolerance)
throw Standard_DomainError("GeomConvert_BSplineCurveToBezierSurface");
Standard_Real Uf = U1, Ul = U2;
Standard_Real PTol = ParametricTolerance/2 ;
Standard_Integer I1, I2;
myCurve = Handle(Geom_BSplineCurve)::DownCast(BasisCurve->Copy());
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(Geom_BezierCurve) GeomConvert_BSplineCurveToBezierCurve::Arc
(const Standard_Integer Index)
{
if ( Index < 1 || Index > myCurve->NbKnots()-1) {
throw Standard_OutOfRange("GeomConvert_BSplineCurveToBezierCurve");
}
Standard_Integer Deg = myCurve->Degree();
TColgp_Array1OfPnt Poles(1,Deg+1);
Handle(Geom_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 Geom_BezierCurve(Poles,Weights);
}
else {
for ( Standard_Integer i = 1; i <= Deg+1; i++) {
Poles(i) = myCurve->Pole(i+Deg*(Index-1));
}
C = new Geom_BezierCurve(Poles);
}
return C;
}
//=======================================================================
//function : Arcs
//purpose :
//=======================================================================
void GeomConvert_BSplineCurveToBezierCurve::Arcs
(TColGeom_Array1OfBezierCurve& Curves)
{
Standard_Integer n = NbArcs();
for ( Standard_Integer i = 1; i <= n; i++) {
Curves(i) = Arc(i);
}
}
//=======================================================================
//function : Knots
//purpose :
//=======================================================================
void GeomConvert_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 GeomConvert_BSplineCurveToBezierCurve::NbArcs() const
{
return (myCurve->NbKnots()-1);
}