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#include <ShapeCustom_Curve.ixx>
#include <Geom_BSplineCurve.hxx>
#include <TColStd_Array1OfReal.hxx>
#include <TColgp_Array1OfPnt.hxx>
#include <TColStd_Array1OfInteger.hxx>
#include <ShapeAnalysis_Curve.hxx>
ShapeCustom_Curve::ShapeCustom_Curve()
{
}
//=======================================================================
//function : ShapeCustom_Curve
//purpose :
//=======================================================================
ShapeCustom_Curve::ShapeCustom_Curve (const Handle(Geom_Curve)& C)
{
Init ( C );
}
//=======================================================================
//function : Init
//purpose :
//=======================================================================
void ShapeCustom_Curve::Init (const Handle(Geom_Curve)& C)
{
myCurve = C;
}
//=======================================================================
//function : ConvertToPeriodic
//purpose :
//=======================================================================
Handle(Geom_Curve) ShapeCustom_Curve::ConvertToPeriodic (const Standard_Boolean substitute,
const Standard_Real preci)
{
Handle(Geom_Curve) newCurve;
Handle(Geom_BSplineCurve) BSpl = Handle(Geom_BSplineCurve)::DownCast(myCurve);
if (BSpl.IsNull()) return newCurve;
// PTV 13.02.02: check if curve closed with tolerance
Standard_Boolean closed = ShapeAnalysis_Curve::IsClosed(myCurve, preci);
if ( ! closed ) return newCurve;
Standard_Boolean converted = Standard_False; //:p6
if ( closed && ! BSpl->IsPeriodic() && BSpl->NbPoles() >3 ) {
Standard_Boolean set = Standard_True;
// if degree+1 at ends, first change it to 1 by rearranging knots
if ( BSpl->Multiplicity(1) == BSpl->Degree() + 1 &&
BSpl->Multiplicity(BSpl->NbKnots()) == BSpl->Degree() + 1 ) {
Standard_Integer nbPoles = BSpl->NbPoles();
TColgp_Array1OfPnt oldPoles(1,nbPoles);
TColStd_Array1OfReal oldWeights(1,nbPoles);
Standard_Integer nbKnots = BSpl->NbKnots();
TColStd_Array1OfReal oldKnots(1,nbKnots);
TColStd_Array1OfInteger oldMults(1,nbKnots);
BSpl->Poles(oldPoles);
BSpl->Weights(oldWeights);
BSpl->Knots(oldKnots);
BSpl->Multiplicities(oldMults);
TColStd_Array1OfReal newKnots (1,nbKnots+2);
TColStd_Array1OfInteger newMults(1,nbKnots+2);
Standard_Real a = 0.5 * ( BSpl->Knot(2) - BSpl->Knot(1) +
BSpl->Knot(nbKnots) - BSpl->Knot(nbKnots-1) );
newKnots(1) = oldKnots(1) - a;
newKnots(nbKnots+2) = oldKnots(nbKnots) + a;
newMults(1) = newMults(nbKnots+2) = 1;
for (Standard_Integer i = 2; i<=nbKnots+1; i++) {
newKnots(i) = oldKnots(i-1);
newMults(i) = oldMults(i-1);
}
newMults(2) = newMults(nbKnots+1) = BSpl->Degree();
Handle(Geom_BSplineCurve) res = new Geom_BSplineCurve(oldPoles, oldWeights,
newKnots,newMults,
BSpl->Degree(),BSpl->IsPeriodic());
BSpl = res;
}
else if ( BSpl->Multiplicity(1) > BSpl->Degree() ||
BSpl->Multiplicity(BSpl->NbKnots()) > BSpl->Degree() + 1 ) set = Standard_False;
if ( set ) {
BSpl->SetPeriodic(); // make periodic
converted = Standard_True;
}
}
#ifdef DEBUG
cout << "Warning: ShapeCustom_Surface: Closed BSplineSurface is caused to be periodic" << endl;
#endif
if ( ! converted ) return newCurve;
newCurve = BSpl;
if ( substitute ) myCurve = newCurve;
return newCurve;
}
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