src/GeomAlgoAPI/GeomAlgoAPI_Offset.cpp

   1 // Copyright (C) 2019-2019  CEA/DEN, EDF R&D
   2 //
   3 // This library is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU Lesser General Public
   5 // License as published by the Free Software Foundation; either
   6 // version 2.1 of the License, or (at your option) any later version.
   7 //
   8 // This library is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // Lesser General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU Lesser General Public
  14 // License along with this library; if not, write to the Free Software
  15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  16 //
  17 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
  18 //
  19
  20 #include "GeomAlgoAPI_Offset.h"
  21
  22 #include <BRepOffsetAPI_MakeOffsetShape.hxx>
  23 #include <BRepOffsetAPI_MakeOffset.hxx>
  24
  25 #include <BRepBuilderAPI_MakeWire.hxx>
  26 #include <BRepBuilderAPI_MakeFace.hxx>
  27
  28 #include <TopoDS.hxx>
  29 #include <TopoDS_Wire.hxx>
  30
  31 GeomAlgoAPI_Offset::GeomAlgoAPI_Offset(const GeomShapePtr& theShape,
  32                                        const double theOffsetValue)
  33 {
  34   build(theShape, theOffsetValue);
  35 }
  36
  37 void GeomAlgoAPI_Offset::build(const GeomShapePtr& theShape, const double theOffsetValue)
  38 {
  39   BRepOffsetAPI_MakeOffsetShape* anOffsetAlgo = new BRepOffsetAPI_MakeOffsetShape;
  40   anOffsetAlgo->PerformBySimple(theShape->impl<TopoDS_Shape>(), theOffsetValue);
  41   setImpl(anOffsetAlgo);
  42   setBuilderType(OCCT_BRepBuilderAPI_MakeShape);
  43
  44   if (anOffsetAlgo->IsDone()) {
  45     const TopoDS_Shape& aResult = anOffsetAlgo->Shape();
  46     std::shared_ptr<GeomAPI_Shape> aShape(new GeomAPI_Shape());
  47     aShape->setImpl(new TopoDS_Shape(aResult));
  48     setShape(aShape);
  49     setDone(true);
  50   }
  51 }
  52
  53 void GeomAlgoAPI_Offset::generated(const GeomShapePtr theOldShape,
  54                                    ListOfShape& theNewShapes)
  55 {
  56   try {
  57     GeomAlgoAPI_MakeShape::generated(theOldShape, theNewShapes);
  58   } catch(...) {
  59     // nothing is generated
  60   }
  61 }
  62
  63 //GeomShapePtr GeomAlgoAPI_Offset::OffsetInPlane (const std::shared_ptr<GeomAPI_Pln>& thePlane,
  64 //                                                const ListOfShape& theEdgesAndWires,
  65 //                                                const double theOffsetValue)
  66 //{
  67 //}
  68
  69 GeomShapePtr GeomAlgoAPI_Offset::OffsetInPlane (const std::shared_ptr<GeomAPI_Pln>& thePlane,
  70                                                 const GeomShapePtr& theEdgeOrWire,
  71                                                 const double theOffsetValue)
  72 {
  73   GeomShapePtr aResult;
  74
  75   // 1. Make wire from edge, if need
  76   TopoDS_Wire aWire;
  77   TopoDS_Shape anEdgeOrWire = theEdgeOrWire->impl<TopoDS_Shape>();
  78   if (anEdgeOrWire.ShapeType() == TopAbs_WIRE) {
  79     aWire = TopoDS::Wire(anEdgeOrWire);
  80   } else {
  81     if (anEdgeOrWire.ShapeType() == TopAbs_EDGE) {
  82       BRepBuilderAPI_MakeWire aWireBuilder;
  83       aWireBuilder.Add(TopoDS::Edge(anEdgeOrWire));
  84       if (aWireBuilder.IsDone()) {
  85         aWire = aWireBuilder.Wire();
  86       }
  87     }
  88   }
  89   if (aWire.IsNull())
  90     return aResult;
  91
  92   // 2. Make invalid face to pass it in Offset algorithm
  93   BRepBuilderAPI_MakeFace aFaceBuilder (thePlane->impl<gp_Pln>(), aWire);
  94   const TopoDS_Face& aFace = aFaceBuilder.Face();
  95
  96   // 3. Make Offset
  97   BRepOffsetAPI_MakeOffset aParal;
  98   aParal.Init(aFace, GeomAbs_Arc, Standard_True);
  99   aParal.Perform(theOffsetValue, 0.);
 100   if (aParal.IsDone()) {
 101     TopoDS_Shape anOffset = aParal.Shape();
 102     aResult.reset(new GeomAPI_Shape());
 103     aResult->setImpl(new TopoDS_Shape(anOffset));
 104   }
 105
 106   return aResult;
 107 }