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// File: ShapeUpgrade_SplitCurve2dContinuity.cxx
// Created: Wed Apr 14 19:18:17 1999
// Author: Roman LYGIN
// <rln@kinox.nnov.matra-dtv.fr>
#include <ShapeUpgrade_SplitCurve2dContinuity.ixx>
#include <Standard_ErrorHandler.hxx>
#include <Standard_Failure.hxx>
#include <Geom2d_BSplineCurve.hxx>
#include <Precision.hxx>
#include <ShapeUpgrade.hxx>
#include <Geom2d_TrimmedCurve.hxx>
#include <Geom2d_OffsetCurve.hxx>
#include <TColGeom2d_HArray1OfCurve.hxx>
#include <TColStd_HSequenceOfReal.hxx>
#include <TColGeom2d_HArray1OfCurve.hxx>
#include <ShapeExtend.hxx>
//=======================================================================
//function : ShapeUpgrade_SplitCurve2dContinuity
//purpose :
//=======================================================================
ShapeUpgrade_SplitCurve2dContinuity::ShapeUpgrade_SplitCurve2dContinuity()
{
myCriterion = GeomAbs_C1;
myTolerance = Precision::PConfusion();
myCont =1;
}
//=======================================================================
//function : SetCriterion
//purpose :
//=======================================================================
void ShapeUpgrade_SplitCurve2dContinuity::SetCriterion(const GeomAbs_Shape Criterion)
{
myCriterion = Criterion;
switch (myCriterion) {
case GeomAbs_C0 : myCont = 0; break;
case GeomAbs_C1 : myCont = 1; break;
case GeomAbs_C2 : myCont = 2; break;
case GeomAbs_C3 : myCont = 3; break;
case GeomAbs_CN : myCont = 4; break;
default : myCont = 1;
}
}
//=======================================================================
//function : SetTolerance
//purpose :
//=======================================================================
void ShapeUpgrade_SplitCurve2dContinuity::SetTolerance(const Standard_Real Tol)
{
myTolerance = Tol;
}
//=======================================================================
//function : Compute
//purpose :
//=======================================================================
void ShapeUpgrade_SplitCurve2dContinuity::Compute()
{
if(myCurve->Continuity() < myCriterion)
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE2);
if (mySplitValues->Length() > 2)
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
Standard_Real precision = Precision::PConfusion();
Standard_Real First = mySplitValues->Value(1);
Standard_Real Last = mySplitValues->Value(mySplitValues->Length());
if (myCurve->IsKind(STANDARD_TYPE(Geom2d_TrimmedCurve))) {
Handle(Geom2d_TrimmedCurve) tmp = Handle(Geom2d_TrimmedCurve)::DownCast (myCurve);
Handle(Geom2d_Curve) BasCurve = tmp->BasisCurve();
ShapeUpgrade_SplitCurve2dContinuity spc;
// spc.Init(BasCurve,Max(First,tmp->FirstParameter()),Min(Last,tmp->LastParameter()));
spc.Init(BasCurve,First,Last);
spc.SetSplitValues(mySplitValues);
spc.SetTolerance(myTolerance);
spc.SetCriterion(myCriterion);
spc.Compute();
mySplitValues->Clear();
mySplitValues->ChangeSequence() = spc.SplitValues()->Sequence();
//mySplitValues = spc.SplitValues();
myStatus |= spc.myStatus;
return;
}
else if (myCurve->IsKind(STANDARD_TYPE(Geom2d_OffsetCurve))) {
GeomAbs_Shape BasCriterion;
switch (myCriterion) {
default :
case GeomAbs_C1 : BasCriterion = GeomAbs_C2; break;
case GeomAbs_C2 : BasCriterion = GeomAbs_C3; break;
case GeomAbs_C3 : //if (ShapeUpgrade::Debug()) cout<<". this criterion is not suitable for a Offset curve"<<endl;
#ifdef DEB
cout << "Warning: ShapeUpgrade_SplitCurve2dContinuity: criterion C3 for Offset curve" << endl;
#endif
case GeomAbs_CN : BasCriterion = GeomAbs_CN; break;
}
Handle(Geom2d_OffsetCurve) tmp = Handle(Geom2d_OffsetCurve)::DownCast (myCurve);
Handle(Geom2d_Curve) BasCurve = tmp->BasisCurve();
//Standard_Real Offset = tmp->Offset(); // Offset not used (skl)
ShapeUpgrade_SplitCurve2dContinuity spc;
// spc.Init(BasCurve,Max(tmp->FirstParameter(),First),Min(tmp->LastParameter(),Last));
spc.Init(BasCurve,First,Last);
spc.SetSplitValues(mySplitValues);
spc.SetTolerance(myTolerance);
spc.SetCriterion(BasCriterion);
spc.Compute();
mySplitValues->Clear();
mySplitValues->ChangeSequence() = spc.SplitValues()->Sequence();
myStatus |= spc.myStatus;
return;
}
Handle(Geom2d_BSplineCurve) MyBSpline = Handle(Geom2d_BSplineCurve)::DownCast (myCurve);
if (MyBSpline.IsNull()) {
// if (ShapeUpgrade::Debug()) cout<<". curve is not a Bspline"<<endl;
return;
}
myNbCurves=1;
Standard_Integer Deg=MyBSpline->Degree();
Standard_Integer NbKnots= MyBSpline->NbKnots();
// if (ShapeUpgrade::Debug()) cout<<". NbKnots="<<NbKnots<<endl;
if (NbKnots <= 2) {
return;
}
Standard_Integer FirstInd =MyBSpline->FirstUKnotIndex()+1,
LastInd = MyBSpline->LastUKnotIndex()-1;
Standard_Integer iknot = FirstInd;
for(Standard_Integer j =2; j <= mySplitValues->Length(); j++) {
Last = mySplitValues->Value(j);
for (; iknot <= LastInd; iknot++) {
Standard_Real valknot = MyBSpline->Knot(iknot);
if(valknot <= First + precision) continue;
if(valknot >= Last - precision) break;
Standard_Integer Continuity=Deg-MyBSpline->Multiplicity(iknot);
//Standard_Real tt = MyBSpline->Knot(iknot); // tt not used (skl)
if (Continuity < myCont) {
// At this knot, the curve is C0; try to remove Knot.
Standard_Boolean corrected = Standard_False;
Standard_Integer newMultiplicity = Deg - myCont;
if (newMultiplicity < 0) newMultiplicity = 0;
{
try {
OCC_CATCH_SIGNALS
corrected = MyBSpline->RemoveKnot(iknot, newMultiplicity, myTolerance);
}
catch (Standard_Failure) {
corrected = Standard_False;
}
}
if (corrected && newMultiplicity > 0) {
Continuity=Deg-MyBSpline->Multiplicity(iknot);
corrected = (Continuity >= myCont);
}
if (corrected) {
// at this knot, the continuity is now C1. Nothing else to do.
// if (ShapeUpgrade::Debug()) cout<<". Correction at Knot "<<iknot<<endl;
myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 );
}
else {
// impossible to force C1 within the tolerance:
// this knot will be a splitting value.
mySplitValues->InsertBefore(j++,MyBSpline->Knot(iknot));
myNbCurves++;
// if (ShapeUpgrade::Debug()) cout<<". Splitting at Knot "<<iknot<<endl;
}
}
}
First = Last;
}
if (mySplitValues->Length() > 2)
myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
}
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