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// File: Approx_Curve3d.cxx
// Created: Thu Aug 20 18:33:15 1998
// Author: Philippe MANGIN
// <pmn@sgi29>
#include <Approx_Curve3d.ixx>
#include <gp_Pnt.hxx>
#include <gp_Vec.hxx>
#include <GeomAdaptor_HCurve.hxx>
#include <TColStd_HArray1OfReal.hxx>
#include <AdvApprox_PrefAndRec.hxx>
#include <AdvApprox_ApproxAFunction.hxx>
#include <TColgp_Array1OfPnt.hxx>
#include <Precision.hxx>
//=======================================================================
//class : Approx_Curve3d_Eval
//purpose: evaluator class for approximation
//=======================================================================
class Approx_Curve3d_Eval : public AdvApprox_EvaluatorFunction
{
public:
Approx_Curve3d_Eval (const Handle(Adaptor3d_HCurve)& theFunc,
Standard_Real First, Standard_Real Last)
: fonct(theFunc) { StartEndSav[0] = First; StartEndSav[1] = Last; }
virtual void Evaluate (Standard_Integer *Dimension,
Standard_Real StartEnd[2],
Standard_Real *Parameter,
Standard_Integer *DerivativeRequest,
Standard_Real *Result, // [Dimension]
Standard_Integer *ErrorCode);
private:
Handle(Adaptor3d_HCurve) fonct;
Standard_Real StartEndSav[2];
};
void Approx_Curve3d_Eval::Evaluate (Standard_Integer *Dimension,
Standard_Real StartEnd[2],
Standard_Real *Param, // Parameter at which evaluation
Standard_Integer *Order, // Derivative Request
Standard_Real *Result,// [Dimension]
Standard_Integer *ErrorCode)
{
*ErrorCode = 0;
Standard_Real par = *Param;
// Dimension is incorrect
if (*Dimension!=3) {
*ErrorCode = 1;
}
if(StartEnd[0] != StartEndSav[0] || StartEnd[1]!= StartEndSav[1])
{
fonct = fonct->Trim(StartEnd[0],StartEnd[1],Precision::PConfusion());
StartEndSav[0]=StartEnd[0];
StartEndSav[1]=StartEnd[1];
}
gp_Pnt pnt;
gp_Vec v1, v2;
switch (*Order) {
case 0:
pnt = fonct->Value(par);
Result[0] = pnt.X();
Result[1] = pnt.Y();
Result[2] = pnt.Z();
break;
case 1:
fonct->D1(par, pnt, v1);
Result[0] = v1.X();
Result[1] = v1.Y();
Result[2] = v1.Z();
break;
case 2:
fonct->D2(par, pnt, v1, v2);
Result[0] = v2.X();
Result[1] = v2.Y();
Result[2] = v2.Z();
break;
default:
Result[0] = Result[1] = Result[2] = 0.;
*ErrorCode = 3;
break;
}
}
Approx_Curve3d::Approx_Curve3d(const Handle(Adaptor3d_HCurve)& Curve,
const Standard_Real Tol3d,
const GeomAbs_Shape Order,
const Standard_Integer MaxSegments,
const Standard_Integer MaxDegree)
{
// Initialisation of input parameters of AdvApprox
Standard_Integer Num1DSS=0, Num2DSS=0, Num3DSS=1;
Handle(TColStd_HArray1OfReal) OneDTolNul, TwoDTolNul;
Handle(TColStd_HArray1OfReal) ThreeDTol =
new TColStd_HArray1OfReal(1,Num3DSS);
ThreeDTol->Init(Tol3d);
Standard_Real First = Curve->FirstParameter();
Standard_Real Last = Curve->LastParameter();
Standard_Integer NbInterv_C2 = Curve->NbIntervals(GeomAbs_C2);
TColStd_Array1OfReal CutPnts_C2(1, NbInterv_C2+1);
Curve->Intervals(CutPnts_C2,GeomAbs_C2);
Standard_Integer NbInterv_C3 = Curve->NbIntervals(GeomAbs_C3);
TColStd_Array1OfReal CutPnts_C3(1, NbInterv_C3+1);
Curve->Intervals(CutPnts_C3,GeomAbs_C3);
AdvApprox_PrefAndRec CutTool(CutPnts_C2,CutPnts_C3);
myMaxError = 0;
Approx_Curve3d_Eval ev (Curve, First, Last);
AdvApprox_ApproxAFunction aApprox (Num1DSS, Num2DSS, Num3DSS,
OneDTolNul, TwoDTolNul, ThreeDTol,
First, Last, Order,
MaxDegree, MaxSegments,
ev, CutTool);
myIsDone = aApprox.IsDone();
myHasResult = aApprox.HasResult();
if (myHasResult) {
TColgp_Array1OfPnt Poles(1,aApprox.NbPoles());
aApprox.Poles(1,Poles);
Handle(TColStd_HArray1OfReal) Knots = aApprox.Knots();
Handle(TColStd_HArray1OfInteger) Mults = aApprox.Multiplicities();
Standard_Integer Degree = aApprox.Degree();
myBSplCurve = new Geom_BSplineCurve(Poles, Knots->Array1(), Mults->Array1(), Degree);
myMaxError = aApprox.MaxError(3, 1);
}
}
Handle(Geom_BSplineCurve) Approx_Curve3d::Curve() const
{
return myBSplCurve;
}
Standard_Boolean Approx_Curve3d::IsDone() const
{
return myIsDone;
}
Standard_Boolean Approx_Curve3d::HasResult() const
{
return myHasResult;
}
Standard_Real Approx_Curve3d::MaxError() const
{
return myMaxError;
}
void Approx_Curve3d::Dump(Standard_OStream& o) const
{
o << "******* Dump of ApproxCurve *******" << endl;
o << "*******Degree " << Curve()->Degree() << endl;
o << "*******NbSegments " << Curve()->NbKnots() - 1 << endl;
o << "*******Error " << MaxError() << endl;
}
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