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// File: BRepFill_ApproxSeewing.cxx
// Created: Fri Sep 22 08:44:29 1995
// Author: Bruno DUMORTIER
// <dub@fuegox>
#include <BRepFill_ApproxSeewing.ixx>
#include <AppParCurves_MultiCurve.hxx>
#include <AppDef_Compute.hxx>
#include <AppDef_MultiLine.hxx>
#include <AppDef_MultiPointConstraint.hxx>
#include <BSplCLib.hxx>
#include <PLib.hxx>
#include <Geom_BSplineCurve.hxx>
#include <Geom2d_BSplineCurve.hxx>
#include <TColgp_Array1OfPnt.hxx>
#include <TColgp_Array1OfPnt2d.hxx>
#include <TColStd_Array1OfReal.hxx>
#include <TColStd_Array1OfInteger.hxx>
//=======================================================================
//function : BRepFill_ApproxSeewing
//purpose :
//=======================================================================
BRepFill_ApproxSeewing::BRepFill_ApproxSeewing()
:myIsDone(Standard_False)
{
}
//=======================================================================
//function : BRepFill_ApproxSeewing
//purpose :
//=======================================================================
BRepFill_ApproxSeewing::BRepFill_ApproxSeewing(const BRepFill_MultiLine& ML)
:myIsDone(Standard_False)
{
Perform(ML);
}
//=======================================================================
//function : Perform
//purpose :
//=======================================================================
void BRepFill_ApproxSeewing::Perform(const BRepFill_MultiLine& ML)
{
myML = ML;
// evaluate the approximative length of the 3dCurve
Standard_Integer i;
Standard_Real Length = 0.;
Standard_Real U1 = myML.FirstParameter();
Standard_Real U2 = myML.LastParameter();
Standard_Integer NbPoints = 50;
Standard_Real Dist, dU = (U2 - U1) / ( 2*NbPoints - 1);
TColgp_Array1OfPnt2d LP(1,2*NbPoints); // tableau Longueur <-> Param
gp_Pnt P1, P2;
P1 = myML.Value(U1);
for ( i = 0; i < 2*NbPoints ; i++) {
P2 = myML.Value(U1 + i*dU);
Dist = P1.Distance(P2);
Length += Dist;
LP(i+1) = gp_Pnt2d( Length, U1 + (i*dU));
P1 = P2;
}
// On cherche a mettre NbPoints dans la curve.
// on met les points environ a Length/NbPoints.
AppDef_MultiLine MLS ( NbPoints);
AppDef_MultiPointConstraint MP ( 1, 2);
gp_Pnt P3d;
gp_Pnt2d PF1,PF2;
ML.Value3dOnF1OnF2(U1,P3d,PF1,PF2);
MP.SetPoint (1, P3d);
MP.SetPoint2d(2, PF1);
MP.SetPoint2d(3, PF2);
MLS.SetValue (1, MP);
Standard_Real DCorde = Length / ( NbPoints - 1);
Standard_Real Corde = DCorde;
Standard_Integer Index = 1;
Standard_Real U, Alpha;
for ( i = 2; i < NbPoints; i++) {
while ( LP(Index).X() < Corde) Index ++;
Alpha = (Corde - LP(Index-1).X()) / (LP(Index).X() - LP(Index-1).X());
U = LP(Index-1).Y() + Alpha * ( LP(Index).Y() - LP(Index-1).Y());
AppDef_MultiPointConstraint MPC( 1, 2);
ML.Value3dOnF1OnF2(U,P3d,PF1,PF2);
MPC.SetPoint (1, P3d);
MPC.SetPoint2d(2, PF1);
MPC.SetPoint2d(3, PF2);
MLS.SetValue (i, MPC);
Corde = i*DCorde;
}
AppDef_MultiPointConstraint MPE( 1, 2);
ML.Value3dOnF1OnF2(U2,P3d,PF1,PF2);
MPE.SetPoint (1, P3d);
MPE.SetPoint2d(2, PF1);
MPE.SetPoint2d(3, PF2);
MLS.SetValue (NbPoints, MPE);
AppDef_Compute Fit(MLS);
Standard_Integer NbCurves = Fit.NbMultiCurves();
// Standard_Integer MaxDeg = 0;
if ( NbCurves == 0) {
#ifdef DEBUG_EVOLVED
cout << " TrimSurfaceTool : Approx echoue, on met les polygones" << endl;
#endif
TColStd_Array1OfReal Knots(1,NbPoints);
TColStd_Array1OfInteger Mults(1,NbPoints);
Mults.Init(1);
Mults(1) = Mults(NbPoints) = 2;
TColgp_Array1OfPnt P (1,NbPoints);
TColgp_Array1OfPnt2d P1(1,NbPoints);
TColgp_Array1OfPnt2d P2(1,NbPoints);
Standard_Real Uf = ML.FirstParameter();
Standard_Real Ul = ML.LastParameter();
Standard_Real dU = (Ul-Uf)/(NbPoints-1);
AppDef_MultiPointConstraint MPC;
for ( i = 1; i<= NbPoints-1; i++) {
MPC = MLS.Value(i);
U = Uf + (i-1) * dU;
P (i) = MPC.Point(1);
P1(i) = MPC.Point2d(2);
P2(i) = MPC.Point2d(3);
Knots(i) = U;
}
// eval the last point on Ul
MPC = MLS.Value(NbPoints);
P (NbPoints) = MPC.Point(1);
P1(NbPoints) = MPC.Point2d(2);
P2(NbPoints) = MPC.Point2d(3);
Knots(NbPoints) = Ul;
myCurve = new Geom_BSplineCurve ( P , Knots, Mults, 1);
myPCurve1 = new Geom2d_BSplineCurve( P1, Knots, Mults, 1);
myPCurve2 = new Geom2d_BSplineCurve( P2, Knots, Mults, 1);
myIsDone = Standard_True;
return;
}
// Les approx sont a priori OK.
const AppParCurves_MultiBSpCurve& MBSp =
Fit.SplineValue();
Standard_Integer NbPoles = MBSp.NbPoles();
TColgp_Array1OfPnt Poles (1 , NbPoles);
TColgp_Array1OfPnt2d Poles2d1(1 , NbPoles);
TColgp_Array1OfPnt2d Poles2d2(1 , NbPoles);
MBSp.Curve(1, Poles);
MBSp.Curve(2, Poles2d1);
MBSp.Curve(3, Poles2d2);
const TColStd_Array1OfReal& Knots = MBSp.Knots();
const TColStd_Array1OfInteger& Mults = MBSp.Multiplicities();
Standard_Integer Degree = MBSp.Degree();
myCurve = new Geom_BSplineCurve (Poles, Knots,Mults,Degree);
myPCurve1 = new Geom2d_BSplineCurve(Poles2d1,Knots,Mults,Degree);
myPCurve2 = new Geom2d_BSplineCurve(Poles2d2,Knots,Mults,Degree);
myIsDone = Standard_True;
}
//=======================================================================
//function : IsDone
//purpose :
//=======================================================================
Standard_Boolean BRepFill_ApproxSeewing::IsDone() const
{
return myIsDone;
}
//=======================================================================
//function : Handle_Geom_Curve&
//purpose :
//=======================================================================
const Handle(Geom_Curve)& BRepFill_ApproxSeewing::Curve() const
{
StdFail_NotDone_Raise_if( !myIsDone,
"BRepFill_ApproxSeewing::Curve");
return myCurve;
}
//=======================================================================
//function : Handle_Geom2d_Curve&
//purpose :
//=======================================================================
const Handle(Geom2d_Curve)& BRepFill_ApproxSeewing::CurveOnF1() const
{
StdFail_NotDone_Raise_if( !myIsDone,
"BRepFill_ApproxSeewing::CurveOnF1");
return myPCurve1;
}
//=======================================================================
//function : Handle_Geom2d_Curve&
//purpose :
//=======================================================================
const Handle(Geom2d_Curve)& BRepFill_ApproxSeewing::CurveOnF2() const
{
StdFail_NotDone_Raise_if( !myIsDone,
"BRepFill_ApproxSeewing::CurveOnF2");
return myPCurve2;
}
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