0031668: Visualization - WebGL sample doesn't work on Emscripten 1.39

[occt.git] / src / BRepExtrema / BRepExtrema_ShapeProximity.cxx

// Created on: 2014-10-20
// Created by: Denis BOGOLEPOV
// Copyright (c) 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 <BRepExtrema_ShapeProximity.hxx>

#include <Precision.hxx>
#include <TopExp_Explorer.hxx>

//=======================================================================
//function : BRepExtrema_ShapeProximity
//purpose  : Creates uninitialized proximity tool
//=======================================================================
BRepExtrema_ShapeProximity::BRepExtrema_ShapeProximity (const Standard_Real theTolerance)
: myTolerance   (theTolerance),
  myElementSet1 (new BRepExtrema_TriangleSet),
  myElementSet2 (new BRepExtrema_TriangleSet)
{
  // Should be initialized later
  myIsInitS1 = myIsInitS2 = Standard_False;
}

//=======================================================================
//function : BRepExtrema_ShapeProximity
//purpose  : Creates proximity tool for the given two shapes
//=======================================================================
BRepExtrema_ShapeProximity::BRepExtrema_ShapeProximity (const TopoDS_Shape& theShape1,
                                                        const TopoDS_Shape& theShape2,
                                                        const Standard_Real theTolerance)
: myTolerance   (theTolerance),
  myElementSet1 (new BRepExtrema_TriangleSet),
  myElementSet2 (new BRepExtrema_TriangleSet)
{
  LoadShape1 (theShape1);
  LoadShape2 (theShape2);
}

//=======================================================================
//function : LoadShape1
//purpose  : Loads 1st shape into proximity tool
//=======================================================================
Standard_Boolean BRepExtrema_ShapeProximity::LoadShape1 (const TopoDS_Shape& theShape1)
{
  myFaceList1.Clear();

  for (TopExp_Explorer anIter (theShape1, TopAbs_FACE); anIter.More(); anIter.Next())
  {
    myFaceList1.Append (static_cast<const TopoDS_Face&> (anIter.Current()));
  }

  myOverlapTool.MarkDirty();

  return myIsInitS1 = myElementSet1->Init (myFaceList1);
}

//=======================================================================
//function : LoadShape2
//purpose  : Loads 2nd shape into proximity tool
//=======================================================================
Standard_Boolean BRepExtrema_ShapeProximity::LoadShape2 (const TopoDS_Shape& theShape2)
{
  myFaceList2.Clear();

  for (TopExp_Explorer anIter (theShape2, TopAbs_FACE); anIter.More(); anIter.Next())
  {
    myFaceList2.Append (static_cast<const TopoDS_Face&> (anIter.Current()));
  }

  myOverlapTool.MarkDirty();

  return myIsInitS2 = myElementSet2->Init (myFaceList2);
}

//=======================================================================
//function : Perform
//purpose  : Performs search of overlapped faces
//=======================================================================
void BRepExtrema_ShapeProximity::Perform()
{
  if (!myIsInitS1 || !myIsInitS2 || myOverlapTool.IsDone())
  {
    return;
  }

  myOverlapTool.LoadTriangleSets (myElementSet1,
                                  myElementSet2);

  myOverlapTool.Perform (myTolerance);
}