src/GeomAlgoAPI/GeomAlgoAPI_Offset.cpp

   1 // Copyright (C) 2019-2023  CEA, EDF
   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 <GeomAPI_Pln.h>
  23
  24 #include <BRepOffsetAPI_MakeOffsetShape.hxx>
  25 #include <BRepOffsetAPI_MakeOffset.hxx>
  26
  27 #include <BRepBuilderAPI_MakeWire.hxx>
  28 #include <BRepBuilderAPI_MakeFace.hxx>
  29
  30 #include <TopoDS.hxx>
  31 #include <TopoDS_Wire.hxx>
  32
  33 GeomAlgoAPI_Offset::GeomAlgoAPI_Offset(const GeomShapePtr& theShape,
  34                                        const double theOffsetValue)
  35 {
  36   build(theShape, theOffsetValue);
  37 }
  38
  39 void GeomAlgoAPI_Offset::build(const GeomShapePtr& theShape, const double theOffsetValue)
  40 {
  41   BRepOffsetAPI_MakeOffsetShape* anOffsetAlgo = new BRepOffsetAPI_MakeOffsetShape;
  42   anOffsetAlgo->PerformBySimple(theShape->impl<TopoDS_Shape>(), theOffsetValue);
  43   setImpl(anOffsetAlgo);
  44   setBuilderType(OCCT_BRepBuilderAPI_MakeShape);
  45
  46   if (anOffsetAlgo->IsDone()) {
  47     const TopoDS_Shape& aResult = anOffsetAlgo->Shape();
  48     std::shared_ptr<GeomAPI_Shape> aShape(new GeomAPI_Shape());
  49     aShape->setImpl(new TopoDS_Shape(aResult));
  50     setShape(aShape);
  51     setDone(true);
  52   }
  53 }
  54
  55 void GeomAlgoAPI_Offset::generated(const GeomShapePtr theOldShape,
  56                                    ListOfShape& theNewShapes)
  57 {
  58   try {
  59     GeomAlgoAPI_MakeShape::generated(theOldShape, theNewShapes);
  60   } catch(...) {
  61     // nothing is generated
  62   }
  63 }
  64
  65 GeomAlgoAPI_Offset::GeomAlgoAPI_Offset(const GeomPlanePtr& thePlane,
  66                                        const GeomShapePtr& theEdgeOrWire,
  67                                        const double theOffsetValue,
  68                                        const GeomAlgoAPI_OffsetJoint theJoint,
  69                                        const bool theIsApprox)
  70 {
  71   // 1. Make wire from edge, if need
  72   TopoDS_Wire aWire;
  73   TopoDS_Shape anEdgeOrWire = theEdgeOrWire->impl<TopoDS_Shape>();
  74   if (anEdgeOrWire.ShapeType() == TopAbs_WIRE) {
  75     aWire = TopoDS::Wire(anEdgeOrWire);
  76   } else {
  77     if (anEdgeOrWire.ShapeType() == TopAbs_EDGE) {
  78       BRepBuilderAPI_MakeWire aWireBuilder;
  79       aWireBuilder.Add(TopoDS::Edge(anEdgeOrWire));
  80       if (aWireBuilder.IsDone()) {
  81         aWire = aWireBuilder.Wire();
  82       }
  83     }
  84   }
  85   if (aWire.IsNull())
  86     return;
  87
  88   // 2. Make invalid face to pass it in Offset algorithm
  89   BRepBuilderAPI_MakeFace aFaceBuilder (thePlane->impl<gp_Pln>(), aWire);
  90   const TopoDS_Face& aFace = aFaceBuilder.Face();
  91
  92   // 3. Make Offset
  93   BRepOffsetAPI_MakeOffset* aParal = new BRepOffsetAPI_MakeOffset;
  94   setImpl(aParal);
  95   setBuilderType(OCCT_BRepBuilderAPI_MakeShape);
  96
  97   // Joint type
  98   GeomAbs_JoinType aJoin = GeomAbs_Arc; // default mode, corresponding to KeepDistance
  99   if (theJoint == GeomAlgoAPI_OffsetJoint::Lines)
 100     aJoin = GeomAbs_Intersection;
 101   // for GeomAlgoAPI_OffsetJoint::Arcs do the same as for KeepDistance
 102
 103   Standard_Boolean isOpenResult = !aWire.Closed();
 104   aParal->Init(aFace, aJoin, isOpenResult);
 105   aParal->SetApprox(theIsApprox);
 106   aParal->Perform(theOffsetValue, 0.);
 107   if (aParal->IsDone()) {
 108     TopoDS_Shape anOffset = aParal->Shape();
 109     GeomShapePtr aResult(new GeomAPI_Shape());
 110     aResult->setImpl(new TopoDS_Shape(anOffset));
 111     setShape(aResult);
 112     setDone(true);
 113   }
 114 }