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 // Created on: 1991-02-20
 // Created by: Jacques GOUSSARD
 // Copyright (c) 1991-1999 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 _IntAna2d_AnaIntersection_HeaderFile
 #define _IntAna2d_AnaIntersection_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
 #include <Standard_Integer.hxx>
 #include <IntAna2d_IntPoint.hxx>
 class gp_Lin2d;
 class gp_Circ2d;
 class IntAna2d_Conic;
 class gp_Elips2d;
 class gp_Parab2d;
 class gp_Hypr2d;
 
 
 //! Implementation of the analytical intersection between:
 //! - two Lin2d,
 //! - two Circ2d,
 //! - a Lin2d and a Circ2d,
 //! - an element of gp (Lin2d, Circ2d, Elips2d, Parab2d, Hypr2d)
 //! and another conic.
 //! No tolerance is given for all the intersections: the tolerance
 //! will be the "precision machine".
 class IntAna2d_AnaIntersection 
 {
 public:
 
   DEFINE_STANDARD_ALLOC
 
   
   //! Empty constructor. IsDone returns False.
   Standard_EXPORT IntAna2d_AnaIntersection();
   
   //! Intersection between two lines.
   Standard_EXPORT IntAna2d_AnaIntersection(const gp_Lin2d& L1, const gp_Lin2d& L2);
   
   //! Intersection between two circles.
   Standard_EXPORT IntAna2d_AnaIntersection(const gp_Circ2d& C1, const gp_Circ2d& C2);
   
   //! Intersection between a line and a circle.
   Standard_EXPORT IntAna2d_AnaIntersection(const gp_Lin2d& L, const gp_Circ2d& C);
   
   //! Intersection between a line and a conic.
   Standard_EXPORT IntAna2d_AnaIntersection(const gp_Lin2d& L, const IntAna2d_Conic& C);
   
   //! Intersection between a circle and another conic.
   Standard_EXPORT IntAna2d_AnaIntersection(const gp_Circ2d& C, const IntAna2d_Conic& Co);
   
   //! Intersection between an ellipse and another conic.
   Standard_EXPORT IntAna2d_AnaIntersection(const gp_Elips2d& E, const IntAna2d_Conic& C);
   
   //! Intersection between a parabola and another conic.
   Standard_EXPORT IntAna2d_AnaIntersection(const gp_Parab2d& P, const IntAna2d_Conic& C);
   
   //! Intersection between an hyperbola and another conic.
   Standard_EXPORT IntAna2d_AnaIntersection(const gp_Hypr2d& H, const IntAna2d_Conic& C);
   
   //! Intersection between two lines.
   Standard_EXPORT void Perform (const gp_Lin2d& L1, const gp_Lin2d& L2);
   
   //! Intersection between two circles.
   Standard_EXPORT void Perform (const gp_Circ2d& C1, const gp_Circ2d& C2);
   
   //! Intersection between a line and a circle.
   Standard_EXPORT void Perform (const gp_Lin2d& L, const gp_Circ2d& C);
   
   //! Intersection between a line and a conic.
   Standard_EXPORT void Perform (const gp_Lin2d& L, const IntAna2d_Conic& C);
   
   //! Intersection between a circle and another conic.
   Standard_EXPORT void Perform (const gp_Circ2d& C, const IntAna2d_Conic& Co);
   
   //! Intersection between an ellipse and another conic.
   Standard_EXPORT void Perform (const gp_Elips2d& E, const IntAna2d_Conic& C);
   
   //! Intersection between a parabola and another conic.
   Standard_EXPORT void Perform (const gp_Parab2d& P, const IntAna2d_Conic& C);
   
   //! Intersection between an hyperbola and another conic.
   Standard_EXPORT void Perform (const gp_Hypr2d& H, const IntAna2d_Conic& C);
   
   //! Returns TRUE if the computation was successful.
     Standard_Boolean IsDone() const;
   
   //! Returns TRUE when there is no intersection, i-e
   //! - no intersection point
   //! - the elements are not identical.
   //! The element may be parallel in this case.
     Standard_Boolean IsEmpty() const;
   
   //! For the intersection between an element of gp and a conic
   //! known by an implicit equation, the result will be TRUE
   //! if the element of gp verifies the implicit equation.
   //! For the intersection between two Lin2d or two Circ2d, the
   //! result will be TRUE if the elements are identical.
   //! The function returns FALSE in all the other cases.
     Standard_Boolean IdenticalElements() const;
   
   //! For the intersection between two Lin2d or two Circ2d,
   //! the function returns TRUE if the elements are parallel.
   //! The function returns FALSE in all the other cases.
     Standard_Boolean ParallelElements() const;
   
   //! returns the number of IntPoint between the 2 curves.
     Standard_Integer NbPoints() const;
   
   //! returns the intersection point of range N;
   //! If (N<=0) or (N>NbPoints), an exception is raised.
     const IntAna2d_IntPoint& Point (const Standard_Integer N) const;
 
 
 
 
 protected:
 
 
 
 
 
 private:
 
 
 
   Standard_Boolean done;
   Standard_Boolean para;
   Standard_Boolean iden;
   Standard_Boolean empt;
   Standard_Integer nbp;
   IntAna2d_IntPoint lpnt[4];
 
 
 };
 
 
 #include <IntAna2d_AnaIntersection.lxx>
 
 
 
 
 
 #endif // _IntAna2d_AnaIntersection_HeaderFile

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