OCCT

// Created on: 1994-03-23
// Created by: Jean Marc LACHAUME
// Copyright (c) 1994-1999 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 <ElCLib.hxx>
#include <Geom2d_Line.hxx>
#include <Geom2dHatch_Intersector.hxx>
#include <GeomLProp_CLProps.hxx>
#include <gp_Dir2d.hxx>
#include <gp_Lin2d.hxx>
#include <Precision.hxx>

//=================================================================================================

Geom2dHatch_Intersector::Geom2dHatch_Intersector()
    : myConfusionTolerance(0.0),
      myTangencyTolerance(0.0)
{
}

//=================================================================================================

void Geom2dHatch_Intersector::Perform(const gp_Lin2d&            L,
                                      const double               P,
                                      const double               Tol,
                                      const Geom2dAdaptor_Curve& C)
{

  // double pfbid,plbid;
  IntRes2d_Domain DL;
  if (P != RealLast())
  {
    DL.SetValues(L.Location(), 0., Tol, ElCLib::Value(P, L), P, Tol);
  }
  else
  {
    DL.SetValues(L.Location(), 0., Tol, true);
  }

  IntRes2d_Domain DE(C.Value(C.FirstParameter()),
                     C.FirstParameter(),
                     Precision::PIntersection(),
                     C.Value(C.LastParameter()),
                     C.LastParameter(),
                     Precision::PIntersection());

  occ::handle<Geom2d_Line> GL = new Geom2d_Line(L);
  Geom2dAdaptor_Curve      CGA(GL);
  void*                    ptrpoureviterlesproblemesdeconst = (void*)(&C);

  Geom2dInt_GInter Inter(CGA,
                         DL,
                         *((Geom2dAdaptor_Curve*)ptrpoureviterlesproblemesdeconst),
                         DE,
                         Precision::PConfusion(),
                         Precision::PIntersection());
  this->SetValues(Inter);
}

//=================================================================================================

void Geom2dHatch_Intersector::LocalGeometry(const Geom2dAdaptor_Curve& E,
                                            const double               U,
                                            gp_Dir2d&                  Tang,
                                            gp_Dir2d&                  Norm,
                                            double&                    C) const
{
  GeomLProp_CLProps2d Prop(E.Curve(), U, 2, Precision::PConfusion());

  C = 0.;
  if (Prop.IsTangentDefined())
  {
    Prop.Tangent(Tang);
    C = Prop.Curvature();
  }
  else
  {
    Tang = gp_Dir2d(1., 0.);
  }

  if (C > Precision::PConfusion() && C < RealLast())
  {
    Prop.Normal(Norm);
  }
  else
  {
    Norm.SetCoord(Tang.Y(), -Tang.X());
  }
}