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f6b08ecf71
Subdivision of curve parametric interval based on deflection criteria is added for curve type OtherCurve in Extrema_GExtPC.gxx. Algorithm of subdivision is implemented in Extrema_Curve(2d)Tool.cxx New Draw command projpcurve for projection of point on CurveOnSurface is added in SWDRAW_ShapeAnalysis.cxx projpcurve is modified to reflect "start parameter" in usage message and Draw help.
94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
// Created on: 1995-07-19
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// Created by: Modelistation
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// Copyright (c) 1995-1999 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 <Adaptor3d_Curve.hxx>
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#include <Extrema_CurveTool.hxx>
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#include <Geom_BezierCurve.hxx>
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#include <Geom_BSplineCurve.hxx>
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#include <gp_Pnt.hxx>
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#include <gp_Vec.hxx>
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#include <GCPnts_TangentialDeflection.hxx>
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//=======================================================================
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//function : IsPeriodic
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//purpose :
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//=======================================================================
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Standard_Boolean Extrema_CurveTool::IsPeriodic(const Adaptor3d_Curve& C)
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{
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GeomAbs_CurveType aType = GetType(C);
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if (aType == GeomAbs_Circle ||
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aType == GeomAbs_Ellipse)
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return Standard_True;
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else
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return C.IsPeriodic();
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}
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//=======================================================================
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//function : DeflCurvIntervals
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//purpose :
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//=======================================================================
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Handle(TColStd_HArray1OfReal)
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Extrema_CurveTool::DeflCurvIntervals(const Adaptor3d_Curve& C)
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{
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const Standard_Real epsd = 1.e-3;
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const Standard_Real maxdefl = 1.e3;
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const Standard_Real mindefl = 1.e-3;
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Handle(TColStd_HArray1OfReal) Intervals;
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Standard_Integer nbpnts = 23, i;
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Standard_Real L = 0.;
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Standard_Real tf = C.FirstParameter(), tl = C.LastParameter();
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gp_Pnt aP = C.Value(tf);
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for (i = 2; i <= nbpnts; ++i)
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{
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Standard_Real t = (tf * (nbpnts - i) + (i - 1) * tl) / (nbpnts - 1);
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gp_Pnt aP1 = C.Value(t);
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L += aP.Distance(aP1);
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}
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//
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Standard_Real dLdt = L / (tl - tf);
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if (L <= Precision::Confusion() || dLdt < epsd || (tl - tf) > 10000.) // To avoid problemwith GCPnts
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{
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nbpnts = 2;
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Intervals = new TColStd_HArray1OfReal(1, nbpnts);
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Intervals->SetValue(1, tf);
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Intervals->SetValue(nbpnts, tl);
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return Intervals;
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}
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//
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Standard_Real aDefl = Max(0.01 * L / (2. * M_PI), mindefl);
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if (aDefl > maxdefl)
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{
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nbpnts = 2;
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Intervals = new TColStd_HArray1OfReal(1, nbpnts);
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Intervals->SetValue(1, tf);
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Intervals->SetValue(nbpnts, tl);
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return Intervals;
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}
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//
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Standard_Real aMinLen = Max(.00001*L, Precision::Confusion());
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Standard_Real aTol = Max(0.00001*(tl - tf), Precision::PConfusion());
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//
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GCPnts_TangentialDeflection aPntGen(C, M_PI / 6, aDefl, 2, aTol, aMinLen);
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nbpnts = aPntGen.NbPoints();
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Intervals = new TColStd_HArray1OfReal(1, nbpnts);
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for (i = 1; i <= nbpnts; ++i)
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{
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Intervals->SetValue(i, aPntGen.Parameter(i));
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}
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return Intervals;
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}
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