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 // Created on: 1996-02-13
 // Created by: Yves FRICAUD
 // Copyright (c) 1996-1999 Matra Datavision
 // Copyright (c) 1999-2014 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.
 
 #ifndef _BRepOffsetAPI_MakeOffsetShape_HeaderFile
 #define _BRepOffsetAPI_MakeOffsetShape_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <BRepOffset_MakeOffset.hxx>
 #include <BRepOffset_MakeSimpleOffset.hxx>
 #include <BRepBuilderAPI_MakeShape.hxx>
 #include <BRepOffset_Mode.hxx>
 #include <GeomAbs_JoinType.hxx>
 #include <TopTools_ListOfShape.hxx>
 class TopoDS_Shape;
 
 
 //! Describes functions to build a shell out of a shape. The
 //! result is an unlooped shape parallel to the source shape.
 //! A MakeOffsetShape object provides a framework for:
 //! - defining the construction of a shell
 //! - implementing the construction algorithm
 //! - consulting the result.
 class BRepOffsetAPI_MakeOffsetShape  : public BRepBuilderAPI_MakeShape
 {
 public:
 
   DEFINE_STANDARD_ALLOC
 
   //! Constructor does nothing.
   Standard_EXPORT BRepOffsetAPI_MakeOffsetShape();
 
   //! Constructs offset shape for the given one using simple algorithm without intersections computation.
   Standard_EXPORT void PerformBySimple(const TopoDS_Shape& theS,
                                        const Standard_Real theOffsetValue);
 
   //! Constructs a shape parallel to the shape S, where
   //! - S may be a face, a shell, a solid or a compound of these shape kinds;
   //! - Offset is the offset value. The offset shape is constructed:
   //! - outside S, if Offset is positive,
   //! - inside S, if Offset is negative;
   //! - Tol defines the coincidence tolerance criterion for generated shapes;
   //! - Mode defines the construction type of parallels
   //! applied to the free edges of shape S; currently, only one
   //! construction type is implemented, namely the one where the free
   //! edges do not generate parallels; this corresponds to the default
   //! value BRepOffset_Skin;
   //! - Intersection specifies how the algorithm must work in
   //! order to limit the parallels to two adjacent shapes:
   //! - if Intersection is false (default value), the intersection
   //! is calculated with the parallels to the two adjacent shapes,
   //! - if Intersection is true, the intersection is calculated by
   //! taking all generated parallels into account; this computation method is
   //! more general as it avoids some self-intersections generated in the
   //! offset shape from features of small dimensions on shape S, however this
   //! method has not been completely implemented and therefore is not
   //! recommended for use;
   //! - SelfInter tells the algorithm whether a computation
   //! to eliminate self-intersections must be applied to the resulting
   //! shape; however, as this functionality is not yet
   //! implemented, it is recommended to use the default value (false);
   //! - Join defines how to fill the holes that may appear between
   //! parallels to the two adjacent faces. It may take values
   //! GeomAbs_Arc or GeomAbs_Intersection:
   //! - if Join is equal to GeomAbs_Arc, then pipes are generated
   //! between two free edges of two adjacent parallels,
   //! and spheres are generated on "images" of vertices;
   //! it is the default value,
   //! - if Join is equal to GeomAbs_Intersection, then the parallels to the
   //! two adjacent faces are enlarged and intersected,
   //! so that there are no free edges on parallels to faces.
   //! RemoveIntEdges flag defines whether to remove the INTERNAL edges 
   //! from the result or not.
   //! Warnings
   //! 1. All the faces of the shape S should be based on the surfaces
   //! with continuity at least C1.
   //! 2. The offset value should be sufficiently small to avoid
   //! self-intersections in resulting shape. Otherwise these
   //! self-intersections may appear inside an offset face if its
   //! initial surface is not plane or sphere or cylinder, also some
   //! non-adjacent offset faces may intersect each other. Also, some
   //! offset surfaces may "turn inside out".
   //! 3. The algorithm may fail if the shape S contains vertices where
   //! more than 3 edges converge.
   //! 4. Since 3d-offset algorithm involves intersection of surfaces,
   //! it is under limitations of surface intersection algorithm.
   //! 5. A result cannot be generated if the underlying geometry of S is
   //! BSpline with continuity C0.
   //! Exceptions
   //! Geom_UndefinedDerivative if the underlying
   //! geometry of S is BSpline with continuity C0.
   Standard_EXPORT void PerformByJoin(const TopoDS_Shape& S,
                                      const Standard_Real Offset,
                                      const Standard_Real Tol,
                                      const BRepOffset_Mode Mode = BRepOffset_Skin,
                                      const Standard_Boolean Intersection = Standard_False,
                                      const Standard_Boolean SelfInter = Standard_False,
                                      const GeomAbs_JoinType Join = GeomAbs_Arc,
                                      const Standard_Boolean RemoveIntEdges = Standard_False,
                                      const Message_ProgressRange& theRange = Message_ProgressRange());
 
   //! Returns instance of the unrelying intersection / arc algorithm.
   Standard_EXPORT virtual const BRepOffset_MakeOffset& MakeOffset() const;
 
   //! Does nothing.
   Standard_EXPORT virtual void Build(const Message_ProgressRange& theRange = Message_ProgressRange()) Standard_OVERRIDE;
   
   //! Returns the list of shapes generated from the shape <S>.
   Standard_EXPORT virtual const TopTools_ListOfShape& Generated (const TopoDS_Shape& S) Standard_OVERRIDE;
 
   //! Returns the list of shapes Modified from the shape <S>.
   Standard_EXPORT virtual const TopTools_ListOfShape& Modified (const TopoDS_Shape& S) Standard_OVERRIDE;
 
   //! Returns true if the shape has been removed from the result.
   Standard_EXPORT virtual Standard_Boolean IsDeleted (const TopoDS_Shape& S) Standard_OVERRIDE;
 
   //! Returns offset join type.
   Standard_EXPORT GeomAbs_JoinType GetJoinType() const;
 
 protected:
 
   enum OffsetAlgo_Type
   {
     OffsetAlgo_NONE,
     OffsetAlgo_JOIN,
     OffsetAlgo_SIMPLE
   };
 
   OffsetAlgo_Type myLastUsedAlgo;
 
   BRepOffset_MakeOffset myOffsetShape;
   BRepOffset_MakeSimpleOffset mySimpleOffsetShape;
 };
 
 #endif // _BRepOffsetAPI_MakeOffsetShape_HeaderFile

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