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 // Created on: 1993-03-10
 // Created by: JCV
 // Copyright (c) 1993-1999 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 _Geom_OffsetSurface_HeaderFile
 #define _Geom_OffsetSurface_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_Type.hxx>
 
 #include <GeomAbs_Shape.hxx>
 #include <Geom_Surface.hxx>
 #include <Standard_Integer.hxx>
 #include <GeomEvaluator_OffsetSurface.hxx>
 class Geom_Curve;
 class gp_Pnt;
 class gp_Vec;
 class Geom_BSplineSurface;
 class gp_Trsf;
 class gp_GTrsf2d;
 class Geom_Geometry;
 
 
 class Geom_OffsetSurface;
 DEFINE_STANDARD_HANDLE(Geom_OffsetSurface, Geom_Surface)
 
 //! Describes an offset surface in 3D space.
 //! An offset surface is defined by:
 //! - the basis surface to which it is parallel, and
 //! - the distance between the offset surface and its basis surface.
 //! A point on the offset surface is built by measuring the
 //! offset value along the normal vector at a point on the
 //! basis surface. This normal vector is given by the cross
 //! product D1u^D1v, where D1u and D1v are the
 //! vectors tangential to the basis surface in the u and v
 //! parametric directions at this point. The side of the
 //! basis surface on which the offset is measured
 //! depends on the sign of the offset value.
 //! A Geom_OffsetSurface surface can be
 //! self-intersecting, even if the basis surface does not
 //! self-intersect. The self-intersecting portions are not
 //! deleted at the time of construction.
 //! Warning
 //! There must be only one normal vector defined at any
 //! point on the basis surface. This must be verified by the
 //! user as no check is made at the time of construction
 //! to detect points with multiple possible normal
 //! directions (for example, the top of a conical surface).
 class Geom_OffsetSurface : public Geom_Surface
 {
 
 public:
 
   //! Constructs a surface offset from the basis surface
   //! S, where Offset is the distance between the offset
   //! surface and the basis surface at any point.
   //! A point on the offset surface is built by measuring
   //! the offset value along a normal vector at a point on
   //! S. This normal vector is given by the cross product
   //! D1u^D1v, where D1u and D1v are the vectors
   //! tangential to the basis surface in the u and v
   //! parametric directions at this point. The side of S on
   //! which the offset value is measured is indicated by
   //! this normal vector if Offset is positive, or is the
   //! inverse sense if Offset is negative.
   //! If isNotCheckC0 = TRUE checking if basis surface has C0-continuity
   //! is not made.
   //! Warnings :
   //! - The offset surface is built with a copy of the
   //! surface S. Therefore, when S is modified the
   //! offset surface is not modified.
   //! - No check is made at the time of construction to
   //! detect points on S with multiple possible normal directions.
   //! Raised if S is not at least C1.
   //! Warnings :
   //! No check is done to verify that a unique normal direction is
   //! defined at any point of the basis surface S.
   Standard_EXPORT Geom_OffsetSurface(const Handle(Geom_Surface)& S, const Standard_Real Offset, const Standard_Boolean isNotCheckC0 = Standard_False);
 
   //! Raised if S is not at least C1.
   //! Warnings :
   //! No check is done to verify that a unique normal direction is
   //! defined at any point of the basis surface S.
   //! If isNotCheckC0 = TRUE checking if basis surface has C0-continuity
   //! is not made.
   //! Exceptions
   //! Standard_ConstructionError if the surface S is not
   //! at least "C1" continuous.
   Standard_EXPORT void SetBasisSurface (const Handle(Geom_Surface)& S, const Standard_Boolean isNotCheckC0 = Standard_False);
 
   //! Changes this offset surface by assigning D as the offset value.
   Standard_EXPORT void SetOffsetValue (const Standard_Real D);
 
   //! Returns the offset value of this offset surface.
   inline Standard_Real Offset() const
   { return offsetValue; }
 
   //! Returns the basis surface of this offset surface.
   //! Note: The basis surface can be an offset surface.
   inline const Handle(Geom_Surface) & BasisSurface() const
   { return basisSurf; }
 
   //! Returns osculating surface if base surface is B-spline or Bezier
   inline const Handle(Geom_OsculatingSurface)& OsculatingSurface() const
   { return myOscSurf; }
 
   //! Changes the orientation of this offset surface in the u
   //! parametric direction. The bounds of the surface
   //! are not changed but the given parametric direction is reversed.
   Standard_EXPORT void UReverse() Standard_OVERRIDE;
 
   //! Computes the u  parameter on the modified
   //! surface, produced by reversing the u
   //! parametric direction of this offset surface, for any
   //! point of u parameter U  on this offset surface.
   Standard_EXPORT Standard_Real UReversedParameter (const Standard_Real U) const Standard_OVERRIDE;
 
   //! Changes the orientation of this offset surface in the v parametric direction. The bounds of the surface
   //! are not changed but the given parametric direction is reversed.
   Standard_EXPORT void VReverse() Standard_OVERRIDE;
 
   //! Computes the  v parameter on the modified
   //! surface, produced by reversing the or v
   //! parametric direction of this offset surface, for any
   //! point of  v parameter V on this offset surface.
   Standard_EXPORT Standard_Real VReversedParameter (const Standard_Real V) const Standard_OVERRIDE;
 
   //! Returns the parametric bounds U1, U2, V1 and V2 of
   //! this offset surface.
   //! If the surface is infinite, this function can return:
   //! - Standard_Real::RealFirst(), or
   //! - Standard_Real::RealLast().
   Standard_EXPORT void Bounds (Standard_Real& U1, Standard_Real& U2, Standard_Real& V1, Standard_Real& V2) const Standard_OVERRIDE;
 
   //! This method returns the continuity of the basis surface - 1.
   //! Continuity of the Offset surface :
   //! C0 : only geometric continuity,
   //! C1 : continuity of the first derivative all along the Surface,
   //! C2 : continuity of the second derivative all along the Surface,
   //! C3 : continuity of the third derivative all along the Surface,
   //! CN : the order of continuity is infinite.
   //! Example :
   //! If the basis surface is C2 in the V direction and C3 in the U
   //! direction Shape = C1.
   //! Warnings :
   //! If the basis surface has a unique normal direction defined at
   //! any point this method gives the continuity of the offset
   //! surface otherwise the effective continuity can be lower than
   //! the continuity of the basis surface - 1.
   Standard_EXPORT GeomAbs_Shape Continuity() const Standard_OVERRIDE;
 
   //! This method answer True if the continuity of the basis surface
   //! is N + 1 in the U parametric direction. We suppose in this
   //! class that a unique normal is defined at any point on the basis
   //! surface.
   //! Raised if N <0.
   Standard_EXPORT Standard_Boolean IsCNu (const Standard_Integer N) const Standard_OVERRIDE;
 
   //! This method answer True if the continuity of the basis surface
   //! is N + 1 in the V parametric direction. We suppose in this
   //! class that a unique normal is defined at any point on the basis
   //! surface.
   //! Raised if N <0.
   Standard_EXPORT Standard_Boolean IsCNv (const Standard_Integer N) const Standard_OVERRIDE;
 
   //! Checks whether this offset surface is closed in the u
   //! parametric direction.
   //! Returns true if, taking uFirst and uLast as
   //! the parametric bounds in the u parametric direction,
   //! the distance between the points P(uFirst,v)
   //! and P(uLast,v) is less than or equal to
   //! gp::Resolution() for each value of the   parameter v.
   Standard_EXPORT Standard_Boolean IsUClosed() const Standard_OVERRIDE;
 
   //! Checks whether this offset surface is closed in the u
   //! or v parametric direction. Returns true if taking vFirst and vLast as the
   //! parametric bounds in the v parametric direction, the
   //! distance between the points P(u,vFirst) and
   //! P(u,vLast) is less than or equal to
   //! gp::Resolution() for each value of the parameter u.
   Standard_EXPORT Standard_Boolean IsVClosed() const Standard_OVERRIDE;
 
   //! Returns true if this offset surface is periodic in the u
   //! parametric direction, i.e. if the basis
   //! surface of this offset surface is periodic in this direction.
   Standard_EXPORT Standard_Boolean IsUPeriodic() const Standard_OVERRIDE;
 
   //! Returns the period of this offset surface in the u
   //! parametric direction respectively, i.e. the period of the
   //! basis surface of this offset surface in this parametric direction.
   //! raises if the surface is not uperiodic.
   Standard_EXPORT virtual Standard_Real UPeriod() const Standard_OVERRIDE;
 
   //! Returns true if this offset surface is periodic in the v
   //! parametric direction, i.e. if the basis
   //! surface of this offset surface is periodic in this direction.
   Standard_EXPORT Standard_Boolean IsVPeriodic() const Standard_OVERRIDE;
 
   //! Returns the period of this offset surface in the v
   //! parametric direction respectively, i.e. the period of the
   //! basis surface of this offset surface in this parametric direction.
   //! raises if the surface is not vperiodic.
   Standard_EXPORT virtual Standard_Real VPeriod() const Standard_OVERRIDE;
 
   //! Computes the U isoparametric curve.
   Standard_EXPORT Handle(Geom_Curve) UIso (const Standard_Real U) const Standard_OVERRIDE;
 
   //! Computes the V isoparametric curve.
   //!
   //! The following methods compute value and derivatives.
   //!
   //! Warnings
   //! An exception is raised if a unique normal vector is
   //! not defined on the basis surface for the parametric value (U,V).
   //! No check is done at the creation time and we suppose
   //! in this package that the offset surface can be defined at any point.
   Standard_EXPORT Handle(Geom_Curve) VIso (const Standard_Real V) const Standard_OVERRIDE;
 
   //! @code
   //!   P (U, V) = Pbasis + Offset * Ndir
   //! @endcode
   //! where
   //! @code
   //!   Ndir = D1Ubasis ^ D1Vbasis / ||D1Ubasis ^ D1Vbasis||
   //! @endcode
   //! is the normal direction of the basis surface.
   //! Pbasis, D1Ubasis, D1Vbasis are the point and the first derivatives on the basis surface.
   //! If Ndir is undefined this method computes an approached normal
   //! direction using the following limited development:
   //! @code
   //! Ndir = N0 + DNdir/DU + DNdir/DV + Eps
   //! @endcode
   //! with Eps->0 which requires to compute the second derivatives on the basis surface.
   //! If the normal direction cannot be approximate for this order
   //! of derivation the exception UndefinedValue is raised.
   //!
   //! Raised if the continuity of the basis surface is not C1.
   //! Raised if the order of derivation required to compute the
   //! normal direction is greater than the second order.
   Standard_EXPORT void D0 (const Standard_Real U, const Standard_Real V, gp_Pnt& P) const Standard_OVERRIDE;
 
   //! Raised if the continuity of the basis surface is not C2.
   Standard_EXPORT void D1 (const Standard_Real U, const Standard_Real V, gp_Pnt& P, gp_Vec& D1U, gp_Vec& D1V) const Standard_OVERRIDE;
 
   //! Raised if the continuity of the basis surface is not C3.
   Standard_EXPORT void D2 (const Standard_Real U, const Standard_Real V, gp_Pnt& P, gp_Vec& D1U, gp_Vec& D1V, gp_Vec& D2U, gp_Vec& D2V, gp_Vec& D2UV) const Standard_OVERRIDE;
 
   //! Raised if the continuity of the basis surface is not C4.
   Standard_EXPORT void D3 (const Standard_Real U, const Standard_Real V, gp_Pnt& P, gp_Vec& D1U, gp_Vec& D1V, gp_Vec& D2U, gp_Vec& D2V, gp_Vec& D2UV, gp_Vec& D3U, gp_Vec& D3V, gp_Vec& D3UUV, gp_Vec& D3UVV) const Standard_OVERRIDE;
 
   //! Computes the derivative of order Nu in the direction u and Nv in the direction v.
   //!
   //! Raised if the continuity of the basis surface is not CNu + 1
   //! in the U direction and CNv + 1 in the V direction.
   //! Raised if Nu + Nv < 1 or Nu < 0 or Nv < 0.
   //!
   //! The following methods compute the value and derivatives
   //! on the offset surface and returns the derivatives on the
   //! basis surface too.
   //! The computation of the value and derivatives on the basis
   //! surface are used to evaluate the offset surface.
   //!
   //! Warnings:
   //! The exception UndefinedValue or UndefinedDerivative is
   //! raised if it is not possible to compute a unique offset direction.
   Standard_EXPORT gp_Vec DN (const Standard_Real U, const Standard_Real V, const Standard_Integer Nu, const Standard_Integer Nv) const Standard_OVERRIDE;
 
   //! Applies the transformation T to this offset surface.
   //! Note: the basis surface is also modified.
   Standard_EXPORT void Transform (const gp_Trsf& T) Standard_OVERRIDE;
 
   //! Computes the parameters on the transformed surface for
   //! the transform of the point of parameters U,V on <me>.
   //! @code
   //!   me->Transformed(T)->Value(U',V')
   //! @endcode
   //! is the same point as
   //! @code
   //! me->Value(U,V).Transformed(T)
   //! @endcode
   //! Where U',V' are the new values of U,V after calling
   //! @code
   //! me->TransformParameters(U,V,T)
   //! @endcode
   //! This method calls the basis surface method.
   Standard_EXPORT virtual void TransformParameters (Standard_Real& U, Standard_Real& V, const gp_Trsf& T) const Standard_OVERRIDE;
   
   //! Returns a 2d transformation used to find the new
   //! parameters of a point on the transformed surface.
   //! @code
   //!   me->Transformed(T)->Value(U',V')
   //! @endcode
   //! is the same point as
   //! @code
   //!   me->Value(U,V).Transformed(T)
   //! @endcode
   //! Where U',V' are obtained by transforming U,V with the 2d transformation returned by
   //! @code
   //! me->ParametricTransformation(T)
   //! @endcode
   //! This method calls the basis surface method.
   Standard_EXPORT virtual gp_GTrsf2d ParametricTransformation (const gp_Trsf& T) const Standard_OVERRIDE;
 
   //! Creates a new object which is a copy of this offset surface.
   Standard_EXPORT Handle(Geom_Geometry) Copy() const Standard_OVERRIDE;
 
   //! returns an  equivalent surface of the offset surface
   //! when  the basis surface   is a canonic  surface or a
   //! rectangular  limited surface on canonic surface or if
   //! the offset is null.
   Standard_EXPORT Handle(Geom_Surface) Surface() const;
 
   //! if Standard_True, L is  the local osculating surface
   //! along U at  the point U,V.   It means that  DL/DU is
   //! collinear to DS/DU .  If IsOpposite == Standard_True
   //! these vectors have opposite direction.
   Standard_EXPORT Standard_Boolean UOsculatingSurface (const Standard_Real U, const Standard_Real V, Standard_Boolean& IsOpposite, Handle(Geom_BSplineSurface)& UOsculSurf) const;
 
   //! if Standard_True, L is the local osculating surface
   //! along V at the point U,V.
   //! It means that  DL/DV is
   //! collinear to DS/DV .  If IsOpposite == Standard_True
   //! these vectors have opposite direction.
   Standard_EXPORT Standard_Boolean VOsculatingSurface (const Standard_Real U, const Standard_Real V, Standard_Boolean& IsOpposite, Handle(Geom_BSplineSurface)& VOsculSurf) const;
 
   //! Returns continuity of the basis surface.
   inline GeomAbs_Shape GetBasisSurfContinuity() const
   { return myBasisSurfContinuity; }
 
   //! Dumps the content of me into the stream
   Standard_EXPORT virtual void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const Standard_OVERRIDE;
 
   DEFINE_STANDARD_RTTIEXT(Geom_OffsetSurface,Geom_Surface)
 
 private:
 
   Handle(Geom_Surface) basisSurf;
   Handle(Geom_Surface) equivSurf;
   Standard_Real offsetValue;
   Handle(Geom_OsculatingSurface) myOscSurf;
   GeomAbs_Shape myBasisSurfContinuity;
   Handle(GeomEvaluator_OffsetSurface) myEvaluator;
 };
 
 #endif // _Geom_OffsetSurface_HeaderFile

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