0033661: Data Exchange, Step Import - Tessellated GDTs are not imported

[occt.git] / src / Geom2dInt / Geom2dInt_Geom2dCurveTool.cxx

// Created on: 1992-10-22
// Created by: Laurent BUCHARD
// Copyright (c) 1992-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.


#include <Geom2d_BezierCurve.hxx>
#include <Geom2dInt_Geom2dCurveTool.hxx>
#include <GeomAbs_CurveType.hxx>
#include <Precision.hxx>

//============================================================
Standard_Integer Geom2dInt_Geom2dCurveTool::NbSamples (const Adaptor2d_Curve2d& C,
  const Standard_Real U0,
  const Standard_Real U1) 
{
  GeomAbs_CurveType typC = C.GetType();
  Standard_Integer nbs = C.NbSamples();

  if(typC == GeomAbs_BSplineCurve)
  {
    Standard_Real t=C.LastParameter()-C.FirstParameter();
    if(t > Precision::PConfusion())
    {
      Standard_Real t1 = U1 - U0;
      if(t1 < 0.0) t1 = -t1;
      nbs = C.NbKnots();
      nbs*= C.Degree();
      Standard_Real anb = t1 / t * nbs;
      nbs = (Standard_Integer)anb;

      Standard_Integer aMinPntNb = Max(C.Degree() + 1, 4);
      if(nbs < aMinPntNb)
        nbs = aMinPntNb;
    }
  }
  else if (typC == GeomAbs_Circle)
  {
    //Try to reach deflection = eps*R, eps = 0.01
    const Standard_Real minR = 1.; //eps = 0.01
    Standard_Real R = C.Circle().Radius();
    if(R > minR)
    {
      Standard_Real angl = 0.283079; //2.*ACos(1. - eps);
      Standard_Integer n = RealToInt(Abs(U1 - U0) / angl);
      nbs = Max(n, nbs);
    }
  }

  if(nbs>300)
    nbs = 300;
  return nbs;

}
//============================================================
Standard_Integer Geom2dInt_Geom2dCurveTool::NbSamples (const Adaptor2d_Curve2d& C) { 
  Standard_Integer nbs = C.NbSamples();
  GeomAbs_CurveType typC = C.GetType();
  if (typC == GeomAbs_Circle)
  {
    //Try to reach deflection = eps*R, eps = 0.01
    const Standard_Real minR = 1.; //eps = 0.01
    Standard_Real R = C.Circle().Radius();
    if(R > minR)
    {
      Standard_Real angl = 0.283079; //2.*ACos(1. - eps);
      Standard_Integer n = RealToInt((C.LastParameter()-C.FirstParameter()) / angl);
      nbs = Max(n, nbs);
    }
  }

  return nbs;
 }