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e67e482d99
Modified method: Approx_ComputeLine::Compute Check of multicurve is now always unconditional, the procedure of check is modified to avoid infinite loops. Modified classes: GeomLib_CheckBSplineCurve and GeomLib_Check2dBSplineCurve Correction of poles at the ends of curve is modified to fit the direction of tangent defined by two first points or two last points of walking line. Also modified: BOPAlgo_PaveFiller: modified methods PostTreatFF, RemoveUsedVertices - now unused vertices are included in the list of vertices to be absorbed by other ones.
199 lines
6.6 KiB
C++
199 lines
6.6 KiB
C++
// Created on: 1997-05-28
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// Created by: Xavier BENVENISTE
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// Copyright (c) 1997-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#include <Geom2d_BSplineCurve.hxx>
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#include <Geom_BSplineCurve.hxx>
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#include <GeomLib_Check2dBSplineCurve.hxx>
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#include <gp_Pnt2d.hxx>
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#include <gp_Vec2d.hxx>
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#include <Standard_OutOfRange.hxx>
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#include <StdFail_NotDone.hxx>
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//=======================================================================
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//function : GeomLib_Check2dBSplineCurve
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//purpose :
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//=======================================================================
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GeomLib_Check2dBSplineCurve::GeomLib_Check2dBSplineCurve(const Handle(Geom2d_BSplineCurve)& Curve,
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const Standard_Real Tolerance,
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const Standard_Real AngularTolerance)
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: myCurve(Curve),
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myDone(Standard_False),
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myFixFirstTangent(Standard_False),
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myFixLastTangent(Standard_False),
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myAngularTolerance(Abs(AngularTolerance)),
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myTolerance(Abs(Tolerance)),
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myIndSecondPole(-1),
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myIndPrelastPole(-1)
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{
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Standard_Integer ii,
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num_poles ;
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Standard_Real tangent_magnitude,
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value,
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vector_magnitude ;
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num_poles = myCurve->NbPoles() ;
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if (( ! myCurve->IsPeriodic() )&& num_poles >= 4) {
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gp_Vec2d tangent, tangent_normalized,
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a_vector, avector_normalized;
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const Standard_Real CrossProdTol = myAngularTolerance;
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//Near first
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tangent = gp_Vec2d(myCurve->Pole(1), myCurve->Pole(2));
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tangent_magnitude = tangent.Magnitude() ;
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if (tangent_magnitude > myTolerance)
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tangent_normalized = tangent/tangent_magnitude;
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for (ii = 3; ii <= num_poles; ii++)
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{
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a_vector = gp_Vec2d(myCurve->Pole(1), myCurve->Pole(ii));
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vector_magnitude = a_vector.Magnitude() ;
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if (tangent_magnitude > myTolerance &&
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vector_magnitude > myTolerance)
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{
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avector_normalized = a_vector/vector_magnitude;
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Standard_Real CrossProd = tangent_normalized ^ avector_normalized;
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if (Abs(CrossProd) > CrossProdTol)
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break;
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value = tangent.Dot(a_vector) ;
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if ( value < 0.0e0)
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{
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myFixFirstTangent = Standard_True ;
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myIndSecondPole = ii;
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break;
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}
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}
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}
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//Near last
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tangent = gp_Vec2d(myCurve->Pole(num_poles), myCurve->Pole(num_poles-1));
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tangent_magnitude = tangent.Magnitude() ;
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if (tangent_magnitude > myTolerance)
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tangent_normalized = tangent/tangent_magnitude;
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for (ii = num_poles-2; ii >= 1; ii--)
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{
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a_vector = gp_Vec2d(myCurve->Pole(num_poles), myCurve->Pole(ii));
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vector_magnitude = a_vector.Magnitude() ;
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if (tangent_magnitude > myTolerance &&
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vector_magnitude > myTolerance)
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{
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avector_normalized = a_vector/vector_magnitude;
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Standard_Real CrossProd = tangent_normalized ^ avector_normalized;
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if (Abs(CrossProd) > CrossProdTol)
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break;
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value = tangent.Dot(a_vector) ;
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if (value < 0.0e0)
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{
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myFixLastTangent = Standard_True ;
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myIndPrelastPole = ii;
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break;
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}
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}
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}
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} //if (( ! myCurve->IsPeriodic() )&& num_poles >= 4)
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else {
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myDone = Standard_True ;
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}
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}
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//=======================================================================
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//function : NeedTangentFix
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//purpose :
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//=======================================================================
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void GeomLib_Check2dBSplineCurve::NeedTangentFix(Standard_Boolean & FirstFlag,
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Standard_Boolean & LastFlag) const
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{
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FirstFlag = myFixFirstTangent ;
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LastFlag = myFixLastTangent ;
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}
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//=======================================================================
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//function : FixTangent
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//purpose :
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//=======================================================================
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Handle(Geom2d_BSplineCurve) GeomLib_Check2dBSplineCurve::FixedTangent(const Standard_Boolean FirstFlag,
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const Standard_Boolean LastFlag)
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{
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Handle(Geom2d_BSplineCurve) new_curve ;
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if ((myFixFirstTangent && FirstFlag) ||(myFixLastTangent && LastFlag)) {
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new_curve =
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Handle(Geom2d_BSplineCurve)::DownCast(myCurve->Copy()) ;
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FixTangentOnCurve(new_curve, FirstFlag, LastFlag);
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}
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return new_curve ;
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}
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//=======================================================================
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//function : FixTangent
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//purpose :
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//=======================================================================
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void GeomLib_Check2dBSplineCurve::FixTangent(const Standard_Boolean FirstFlag,
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const Standard_Boolean LastFlag)
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{
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FixTangentOnCurve(myCurve, FirstFlag, LastFlag);
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}
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//=======================================================================
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//function : FixTangentOnCurve
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//purpose :
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//=======================================================================
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void GeomLib_Check2dBSplineCurve::FixTangentOnCurve(Handle(Geom2d_BSplineCurve)& theCurve,
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const Standard_Boolean FirstFlag,
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const Standard_Boolean LastFlag)
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{
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if (myFixFirstTangent && FirstFlag) {
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gp_XY XY1 = theCurve->Pole(1).XY();
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gp_XY XY2 = theCurve->Pole(myIndSecondPole).XY();
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Standard_Real NbSamples = myIndSecondPole - 1;
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for (Standard_Integer i = 2; i < myIndSecondPole; i++)
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{
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Standard_Real ii = i-1;
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gp_Pnt2d aNewPole((1. - ii/NbSamples)*XY1 + ii/NbSamples*XY2);
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theCurve->SetPole(i, aNewPole);
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}
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}
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if (myFixLastTangent && LastFlag) {
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Standard_Integer num_poles = theCurve->NbPoles() ;
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gp_XY XY1 = theCurve->Pole(num_poles).XY();
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gp_XY XY2 = theCurve->Pole(myIndPrelastPole).XY();
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Standard_Real NbSamples = num_poles - myIndPrelastPole;
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for (Standard_Integer i = num_poles-1; i > myIndPrelastPole; i--)
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{
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Standard_Real ii = num_poles-i;
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gp_Pnt2d aNewPole((1. - ii/NbSamples)*XY1 + ii/NbSamples*XY2);
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theCurve->SetPole(i, aNewPole);
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}
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}
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myDone = Standard_True ;
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}
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