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 // Created on: 1992-05-06
 // Created by: Jacques GOUSSARD
 // 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 _IntPatch_Line_HeaderFile
 #define _IntPatch_Line_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_Type.hxx>
 
 #include <IntPatch_IType.hxx>
 #include <IntSurf_TypeTrans.hxx>
 #include <IntSurf_Situation.hxx>
 #include <Standard_Transient.hxx>
 
 
 class IntPatch_Line;
 DEFINE_STANDARD_HANDLE(IntPatch_Line, Standard_Transient)
 
 //! Definition of an intersection line between two
 //! surfaces.
 //! A line may be either geometric : line, circle, ellipse,
 //! parabola, hyperbola, as defined in the class GLine,
 //! or analytic, as defined in the class ALine, or defined
 //! by a set of points (coming from a walking algorithm) as
 //! defined in the class WLine.
 class IntPatch_Line : public Standard_Transient
 {
 
 public:
 
   
   //! To set the values returned by IsUIsoS1,....
   //! The default values are False.
     void SetValue (const Standard_Boolean Uiso1, const Standard_Boolean Viso1, const Standard_Boolean Uiso2, const Standard_Boolean Viso2);
   
   //! Returns the type of geometry 3d (Line, Circle, Parabola,
   //! Hyperbola, Ellipse, Analytic, Walking, Restriction)
     IntPatch_IType ArcType() const;
   
   //! Returns TRUE if the intersection is a line of tangency
   //! between the 2 patches.
     Standard_Boolean IsTangent() const;
   
   //! Returns the type of the transition of the line
   //! for the first surface. The transition is "constant"
   //! along the line.
   //! The transition is IN if the line is oriented in such
   //! a way that the system of vector (N1,N2,T) is right-handed,
   //! where N1 is the normal to the first surface at a point P,
   //! N2 is the normal to the second surface at a point P,
   //! T  is the tangent to the intersection line at P.
   //! If the system of vector is left-handed, the transition
   //! is OUT.
   //! When N1 and N2 are colinear all along the intersection
   //! line, the transition will be
   //! - TOUCH, if it is possible to use the 2nd derivatives
   //! to determine the position of one surafce compared
   //! to the other (see Situation)
   //! - UNDECIDED otherwise.
   //!
   //! If one of the transition is TOUCH or UNDECIDED, the other
   //! one has got the same value.
     IntSurf_TypeTrans TransitionOnS1() const;
   
   //! Returns the type of the transition of the line
   //! for the second surface. The transition is "constant"
   //! along the line.
     IntSurf_TypeTrans TransitionOnS2() const;
   
   //! Returns the situation (INSIDE/OUTSIDE/UNKNOWN) of
   //! the first patch compared to the second one, when
   //! TransitionOnS1 or TransitionOnS2 returns TOUCH.
   //! Otherwise, an exception is raised.
     IntSurf_Situation SituationS1() const;
   
   //! Returns the situation (INSIDE/OUTSIDE/UNKNOWN) of
   //! the second patch compared to the first one, when
   //! TransitionOnS1 or TransitionOnS2 returns TOUCH.
   //! Otherwise, an exception is raised.
     IntSurf_Situation SituationS2() const;
   
   //! Returns TRUE if the intersection is a U isoparametric curve
   //! on the first patch.
     Standard_Boolean IsUIsoOnS1() const;
   
   //! Returns TRUE if the intersection is a V isoparametric curve
   //! on the first patch.
     Standard_Boolean IsVIsoOnS1() const;
   
   //! Returns TRUE if the intersection is a U isoparametric curve
   //! on the second patch.
     Standard_Boolean IsUIsoOnS2() const;
   
   //! Returns TRUE if the intersection is a V isoparametric curve
   //! on the second patch.
     Standard_Boolean IsVIsoOnS2() const;
 
 
 
 
   DEFINE_STANDARD_RTTIEXT(IntPatch_Line,Standard_Transient)
 
 protected:
 
   
   //! To initialize the fields, when the transitions
   //! are In or Out.
   Standard_EXPORT IntPatch_Line(const Standard_Boolean Tang, const IntSurf_TypeTrans Trans1, const IntSurf_TypeTrans Trans2);
   
   //! To initialize the fields, when the transitions
   //! are Touch.
   Standard_EXPORT IntPatch_Line(const Standard_Boolean Tang, const IntSurf_Situation Situ1, const IntSurf_Situation Situ2);
   
   //! To initialize the fields, when the transitions
   //! are Undecided.
   Standard_EXPORT IntPatch_Line(const Standard_Boolean Tang);
 
   IntPatch_IType typ;
 
 
 private:
 
 
   Standard_Boolean tg;
   IntSurf_TypeTrans tS1;
   IntSurf_TypeTrans tS2;
   IntSurf_Situation sit1;
   IntSurf_Situation sit2;
   Standard_Boolean uS1;
   Standard_Boolean vS1;
   Standard_Boolean uS2;
   Standard_Boolean vS2;
 
 
 };
 
 
 #include <IntPatch_Line.lxx>
 
 
 
 
 
 #endif // _IntPatch_Line_HeaderFile

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