1 // Created on: 2016-10-14 2 // Created by: Alexander MALYSHEV 3 // Copyright (c) 1999-2016 OPEN CASCADE SAS 4 // 5 // This file is part of Open CASCADE Technology software library. 6 // 7 // This library is free software; you can redistribute it and/or modify it under 8 // the terms of the GNU Lesser General Public License version 2.1 as published 9 // by the Free Software Foundation, with special exception defined in the file 10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT 11 // distribution for complete text of the license and disclaimer of any warranty. 12 // 13 // Alternatively, this file may be used under the terms of Open CASCADE 14 // commercial license or contractual agreement. 15 16 #ifndef _BRepOffset_SimpleOffset_HeaderFile 17 #define _BRepOffset_SimpleOffset_HeaderFile 18 19 #include <BRepTools_Modification.hxx> 20 #include <GeomAbs_Shape.hxx> 21 #include <Geom2d_Curve.hxx> 22 #include <Standard_Real.hxx> 23 #include <Standard_Macro.hxx> 24 #include <Standard_Type.hxx> 25 #include <TopoDS_Shape.hxx> 26 #include <TopTools_IndexedDataMapOfShapeListOfShape.hxx> 27 #include <NCollection_DataMap.hxx> 28 29 30 class BRepOffset_SimpleOffset; 31 DEFINE_STANDARD_HANDLE(BRepOffset_SimpleOffset, BRepTools_Modification) 32 33 //! This class represents mechanism of simple offset algorithm i. e. 34 //! topology-preserve offset construction without intersection. 35 //! 36 //! The list below shows mapping scheme: 37 //! - Each surface is mapped to its geometric offset surface. 38 //! - For each edge, pcurves are mapped to the same pcurves on offset surfaces. 39 //! - For each edge, 3d curve is constructed by re-approximation of pcurve on the first offset face. 40 //! - Position of each vertex in a result shell is computed as average point of all ends of edges shared by that vertex. 41 //! - Tolerances are updated according to the resulting geometry. 42 class BRepOffset_SimpleOffset : public BRepTools_Modification 43 { 44 public: 45 46 DEFINE_STANDARD_RTTI_INLINE(BRepOffset_SimpleOffset, BRepTools_Modification) 47 48 //! Constructor. 49 //! @param theInputShape shape to be offset 50 //! @param theOffsetValue offset distance (signed) 51 //! @param theTolerance tolerance for handling singular points 52 Standard_EXPORT BRepOffset_SimpleOffset(const TopoDS_Shape& theInputShape, 53 const Standard_Real theOffsetValue, 54 const Standard_Real theTolerance); 55 56 //! Returns Standard_True if the face <F> has been 57 //! modified. In this case, <S> is the new geometric 58 //! support of the face, <L> the new location,<Tol> 59 //! the new tolerance.<RevWires> has to be set to 60 //! Standard_True when the modification reverses the 61 //! normal of the surface.(the wires have to be 62 //! reversed). <RevFace> has to be set to 63 //! Standard_True if the orientation of the modified 64 //! face changes in the shells which contain it. -- 65 //! Here, <RevFace> will return Standard_True if the 66 //! -- gp_Trsf is negative. 67 Standard_EXPORT Standard_Boolean NewSurface (const TopoDS_Face& F, 68 Handle(Geom_Surface)& S, 69 TopLoc_Location& L, 70 Standard_Real& Tol, 71 Standard_Boolean& RevWires, 72 Standard_Boolean& RevFace) Standard_OVERRIDE; 73 74 //! Returns Standard_True if the edge <E> has been 75 //! modified. In this case, <C> is the new geometric 76 //! support of the edge, <L> the new location, <Tol> 77 //! the new tolerance. Otherwise, returns 78 //! Standard_False, and <C>, <L>, <Tol> are not 79 //! significant. 80 Standard_EXPORT Standard_Boolean NewCurve (const TopoDS_Edge& E, 81 Handle(Geom_Curve)& C, 82 TopLoc_Location& L, 83 Standard_Real& Tol) Standard_OVERRIDE; 84 85 //! Returns Standard_True if the vertex <V> has been 86 //! modified. In this case, <P> is the new geometric 87 //! support of the vertex, <Tol> the new tolerance. 88 //! Otherwise, returns Standard_False, and <P>, <Tol> 89 //! are not significant. 90 Standard_EXPORT Standard_Boolean NewPoint (const TopoDS_Vertex& V, 91 gp_Pnt& P, 92 Standard_Real& Tol) Standard_OVERRIDE; 93 94 //! Returns Standard_True if the edge <E> has a new 95 //! curve on surface on the face <F>.In this case, <C> 96 //! is the new geometric support of the edge, <L> the 97 //! new location, <Tol> the new tolerance. 98 //! Otherwise, returns Standard_False, and <C>, <L>, 99 //! <Tol> are not significant. 100 Standard_EXPORT Standard_Boolean NewCurve2d (const TopoDS_Edge& E, 101 const TopoDS_Face& F, 102 const TopoDS_Edge& NewE, 103 const TopoDS_Face& NewF, 104 Handle(Geom2d_Curve)& C, 105 Standard_Real& Tol) Standard_OVERRIDE; 106 107 //! Returns Standard_True if the Vertex <V> has a new 108 //! parameter on the edge <E>. In this case, <P> is 109 //! the parameter, <Tol> the new tolerance. 110 //! Otherwise, returns Standard_False, and <P>, <Tol> 111 //! are not significant. 112 Standard_EXPORT Standard_Boolean NewParameter (const TopoDS_Vertex& V, 113 const TopoDS_Edge& E, 114 Standard_Real& P, 115 Standard_Real& Tol) Standard_OVERRIDE; 116 117 //! Returns the continuity of <NewE> between <NewF1> 118 //! and <NewF2>. 119 //! 120 //! <NewE> is the new edge created from <E>. <NewF1> 121 //! (resp. <NewF2>) is the new face created from <F1> 122 //! (resp. <F2>). 123 Standard_EXPORT GeomAbs_Shape Continuity (const TopoDS_Edge& E, 124 const TopoDS_Face& F1, 125 const TopoDS_Face& F2, 126 const TopoDS_Edge& NewE, 127 const TopoDS_Face& NewF1, 128 const TopoDS_Face& NewF2) Standard_OVERRIDE; 129 130 private: 131 132 //! Method to fill new face data for single face. 133 void FillFaceData(const TopoDS_Face& theFace); 134 135 //! Method to fill new edge data for single edge. 136 void FillEdgeData(const TopoDS_Edge& theEdge, 137 const TopTools_IndexedDataMapOfShapeListOfShape& theEdgeFaceMap, 138 const Standard_Integer theIdx); 139 140 //! Method to fill new vertex data for single vertex. 141 void FillVertexData(const TopoDS_Vertex& theVertex, 142 const TopTools_IndexedDataMapOfShapeListOfShape& theVertexEdgeMap, 143 const Standard_Integer theIdx); 144 145 struct NewFaceData 146 { 147 Handle(Geom_Surface) myOffsetS; 148 TopLoc_Location myL; 149 Standard_Real myTol; 150 Standard_Boolean myRevWires; 151 Standard_Boolean myRevFace; 152 }; 153 154 struct NewEdgeData 155 { 156 Handle(Geom_Curve) myOffsetC; // Resulting curve. 157 TopLoc_Location myL; 158 Standard_Real myTol; 159 }; 160 161 struct NewVertexData 162 { 163 gp_Pnt myP; 164 Standard_Real myTol; 165 }; 166 167 //! Fills offset data. 168 void FillOffsetData(const TopoDS_Shape& theInputShape); 169 170 //! Copy-assignment constructor and copy constructor are not allowed. 171 void operator=(const BRepOffset_SimpleOffset&); 172 BRepOffset_SimpleOffset(const BRepOffset_SimpleOffset&); 173 174 //! Map of faces to new faces information. 175 NCollection_DataMap<TopoDS_Face, NewFaceData> myFaceInfo; 176 177 //! Map of edges to new edges information. 178 NCollection_DataMap<TopoDS_Edge, NewEdgeData> myEdgeInfo; 179 180 //! Map of vertices to new vertices information. 181 NCollection_DataMap<TopoDS_Vertex, NewVertexData> myVertexInfo; 182 183 //! Offset value. 184 Standard_Real myOffsetValue; 185 186 //! Tolerance. 187 Standard_Real myTolerance; 188 }; 189 190 #endif // _BRepOffset_SimpleOffset_HeaderFile 191