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 // Created on: 1992-01-30
 // Created by: Didier PIFFAULT
 // Copyright (c) 1992-1999 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 _TopTrans_SurfaceTransition_HeaderFile
 #define _TopTrans_SurfaceTransition_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
 #include <gp_Dir.hxx>
 #include <TColStd_Array2OfReal.hxx>
 #include <TopTrans_Array2OfOrientation.hxx>
 #include <TopAbs_Orientation.hxx>
 #include <TopAbs_State.hxx>
 
 //! This algorithm  is used to  compute the transition
 //! of a 3D surface intersecting a topological surfacic
 //! boundary on a 3D curve ( intersection curve ).
 //! The  boundary is  described  by a  set of faces
 //! each face is described by
 //! - its support surface,
 //! - an orientation defining its matter side.
 //! The geometric elements are described locally at the
 //! intersection point by a second order development.
 //! A surface is described by the normal vector, the
 //! principal directions and the principal curvatures.
 //! A curve is described  by the  tangent, the normal
 //! and the curvature.
 //! The  algorithm  keeps track of the two faces elements
 //! closest to the part of the curve "before" and "after"
 //! the intersection,  these  two elements are updated
 //! for each new face.
 //! The position of the  curve can be computed when at
 //! least  one surface  element has   been given, this
 //! position is "In","Out" or "On" for the part of the
 //! curve "Before" or "After" the intersection.
 class TopTrans_SurfaceTransition
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Create an empty Surface Transition.
   Standard_EXPORT TopTrans_SurfaceTransition();
 
   //! Initialize  a  Surface Transition with the local
   //! description of the intersection curve and of the
   //! reference surface.
   //! PREQUESITORY : Norm oriented OUTSIDE "geometric matter"
   Standard_EXPORT void Reset(const gp_Dir&       Tgt,
                              const gp_Dir&       Norm,
                              const gp_Dir&       MaxD,
                              const gp_Dir&       MinD,
                              const Standard_Real MaxCurv,
                              const Standard_Real MinCurv);
 
   //! Initialize  a  Surface Transition  with the  local
   //! description of a straight line.
   Standard_EXPORT void Reset(const gp_Dir& Tgt, const gp_Dir& Norm);
 
   //! Add a face element to the boundary.
   //!
   //! - S defines topological orientation for the face :
   //! S FORWARD means: along the intersection curve on the
   //! reference surface, transition states while crossing
   //! the face are OUT,IN.
   //! S REVERSED means states are IN,OUT.
   //! S INTERNAL means states are IN,IN.
   //!
   //! - O defines curve's position on face :
   //! O FORWARD means the face is before the intersection
   //! O REVERSED means the face is AFTER
   //! O INTERNAL means the curve intersection is in the face.
   //! PREQUESITORY : Norm oriented OUTSIDE "geometric matter"
   Standard_EXPORT void Compare(const Standard_Real      Tole,
                                const gp_Dir&            Norm,
                                const gp_Dir&            MaxD,
                                const gp_Dir&            MinD,
                                const Standard_Real      MaxCurv,
                                const Standard_Real      MinCurv,
                                const TopAbs_Orientation S,
                                const TopAbs_Orientation O);
 
   //! Add a plane or a cylindric face to the boundary.
   Standard_EXPORT void Compare(const Standard_Real      Tole,
                                const gp_Dir&            Norm,
                                const TopAbs_Orientation S,
                                const TopAbs_Orientation O);
 
   //! Returns the state of the reference surface before
   //! the interference, this is the position relative to
   //! the surface of a  point very close to the intersection
   //! on the negative side of the tangent.
   Standard_EXPORT TopAbs_State StateBefore() const;
 
   //! Returns the state of the reference surface after
   //! interference, this is the position relative to the
   //! surface of a point very  close to the intersection
   //! on the positive side of the tangent.
   Standard_EXPORT TopAbs_State StateAfter() const;
 
   Standard_EXPORT static TopAbs_State GetBefore(const TopAbs_Orientation Tran);
 
   Standard_EXPORT static TopAbs_State GetAfter(const TopAbs_Orientation Tran);
 
 protected:
 private:
   Standard_EXPORT void UpdateReference(const Standard_Real      Tole,
                                        const Standard_Boolean   isInfRef,
                                        Standard_Real&           CosInf,
                                        Standard_Real&           CosSup,
                                        const TopAbs_Orientation Tran,
                                        TopAbs_Orientation&      TranRef);
 
   Standard_EXPORT Standard_Real ComputeCos(const Standard_Real      Tole,
                                            const gp_Dir&            Norm,
                                            const TopAbs_Orientation O,
                                            Standard_Boolean&        isleft) const;
 
   gp_Dir                       myTgt;
   gp_Dir                       myNorm;
   gp_Dir                       beafter;
   Standard_Real                myCurvRef;
   TColStd_Array2OfReal         myAng;
   TColStd_Array2OfReal         myCurv;
   TopTrans_Array2OfOrientation myOri;
   Standard_Boolean             myTouchFlag;
 };
 
 #endif // _TopTrans_SurfaceTransition_HeaderFile

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