geom/src/GEOMImpl/GEOMImpl_OffsetDriver.cxx

// Copyright (C) 2007-2013  CEA/DEN, EDF R&D, OPEN CASCADE
//
// Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
//
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//

#include <Standard_Stream.hxx>

#include <GEOMImpl_OffsetDriver.hxx>
#include <GEOMImpl_IOffset.hxx>
#include <GEOMImpl_Types.hxx>
#include <GEOM_Function.hxx>

#include <BRepOffsetAPI_MakeOffsetShape.hxx>
#include <BRep_Tool.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Shape.hxx>
#include <TopoDS_Vertex.hxx>
#include <TopAbs.hxx>
#include <TopExp.hxx>

#include <BRepClass3d_SolidClassifier.hxx>

#include <Precision.hxx>
#include <gp_Pnt.hxx>

#include <BRepCheck_Analyzer.hxx>
#include <ShapeFix_ShapeTolerance.hxx>
#include <ShapeFix_Shape.hxx>

#include <Standard_ConstructionError.hxx>
#include <StdFail_NotDone.hxx>

#include "utilities.h"

//=======================================================================
//function : GetID
//purpose  :
//=======================================================================
const Standard_GUID& GEOMImpl_OffsetDriver::GetID()
{
  static Standard_GUID aOffsetDriver("FF1BBB51-5D14-4df2-980B-3A668264EA16");
  return aOffsetDriver;
}


//=======================================================================
//function : GEOMImpl_OffsetDriver
//purpose  :
//=======================================================================
GEOMImpl_OffsetDriver::GEOMImpl_OffsetDriver()
{
}

//=======================================================================
//function : Execute
//purpose  :
//=======================================================================
Standard_Integer GEOMImpl_OffsetDriver::Execute(TFunction_Logbook& log) const
{
  if (Label().IsNull()) return 0;
  Handle(GEOM_Function) aFunction = GEOM_Function::GetFunction(Label());

  GEOMImpl_IOffset aCI (aFunction);
  Standard_Integer aType = aFunction->GetType();

  TopoDS_Shape aShape;

  Handle(GEOM_Function) aRefShape = aCI.GetShape();
  TopoDS_Shape aShapeBase = aRefShape->GetValue();
  Standard_Real anOffset = aCI.GetValue();
  Standard_Real aTol = Precision::Confusion();

  if (Abs(anOffset) < aTol) {
    TCollection_AsciiString aMsg ("Absolute value of offset can not be less than the tolerance value (");
    aMsg += TCollection_AsciiString(aTol);
    aMsg += ")";
    StdFail_NotDone::Raise(aMsg.ToCString());
  }

  if (aType == OFFSET_SHAPE || aType == OFFSET_SHAPE_COPY) {
    BRepOffsetAPI_MakeOffsetShape MO (aShapeBase,
                                      aCI.GetValue(),
                                      aTol);
    if (MO.IsDone()) {
      aShape = MO.Shape();
      // 23.04.2010 skl for bug 21699 from Mantis
      BRepCheck_Analyzer ana (aShape, Standard_True);
      ana.Init(aShape);
      if (!ana.IsValid()) {
        ShapeFix_ShapeTolerance aSFT;
        aSFT.LimitTolerance(aShape, Precision::Confusion(),
                            Precision::Confusion(), TopAbs_SHAPE);
        Handle(ShapeFix_Shape) aSfs = new ShapeFix_Shape(aShape);
        aSfs->Perform();
        aShape = aSfs->Shape();
        ana.Init(aShape);
        if (!ana.IsValid())
          Standard_ConstructionError::Raise("Boolean operation aborted : non valid shape result");
      }
    }
    else {
      StdFail_NotDone::Raise("Offset construction failed");
    }
  }
  else if (aType == OFFSET_THICKENING || aType == OFFSET_THICKENING_COPY)
  {
    BRepClass3d_SolidClassifier aClassifier = BRepClass3d_SolidClassifier(aShapeBase);
    aClassifier.PerformInfinitePoint(Precision::Confusion());
    if (aClassifier.State()==TopAbs_IN)
    {
      // If the generated pipe faces normals are oriented towards the inside, the offset is negative
      // so that the thickening is still towards outside
      anOffset=-anOffset;
    }

    BRepOffset_MakeOffset myOffsetShape(aShapeBase, anOffset, aTol, BRepOffset_Skin,
                                        Standard_False, Standard_False, GeomAbs_Intersection, Standard_True);

    if (!myOffsetShape.IsDone())
    {
      StdFail_NotDone::Raise("Thickening construction failed");
    }
    aShape = myOffsetShape.Shape();

    // Control the solid orientation. This is mostly done to fix a bug in case of extrusion
    // of a circle. The built solid is then badly oriented
    BRepClass3d_SolidClassifier anotherClassifier = BRepClass3d_SolidClassifier(aShape);
    anotherClassifier.PerformInfinitePoint(Precision::Confusion());
    if (anotherClassifier.State()==TopAbs_IN)
    {
      aShape.Reverse();
    }
  }

  if (aShape.IsNull()) return 0;

  aFunction->SetValue(aShape);

  log.SetTouched(Label());

  return 1;
}

//================================================================================
/*!
 * \brief Returns a name of creation operation and names and values of creation parameters
 */
//================================================================================

bool GEOMImpl_OffsetDriver::
GetCreationInformation(std::string&             theOperationName,
                       std::vector<GEOM_Param>& theParams)
{
  if (Label().IsNull()) return 0;
  Handle(GEOM_Function) function = GEOM_Function::GetFunction(Label());

  GEOMImpl_IOffset aCI( function );
  Standard_Integer aType = function->GetType();

  switch ( aType ) {
  case OFFSET_SHAPE:
  case OFFSET_SHAPE_COPY:
    theOperationName = "OFFSET";
    AddParam( theParams, "Object", aCI.GetShape() );
    AddParam( theParams, "Offset", aCI.GetValue() );
    break;
  case OFFSET_THICKENING:
  case OFFSET_THICKENING_COPY:
    theOperationName = "MakeThickening";
    AddParam( theParams, "Object", aCI.GetShape() );
    AddParam( theParams, "Offset", aCI.GetValue() );
    break;
  default:
    return false;
  }
  
  return true;
}

IMPLEMENT_STANDARD_HANDLE (GEOMImpl_OffsetDriver,GEOM_BaseDriver);
IMPLEMENT_STANDARD_RTTIEXT (GEOMImpl_OffsetDriver,GEOM_BaseDriver);