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 // Created on: 1992-04-06
 // 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_ALine_HeaderFile
 #define _IntPatch_ALine_HeaderFile
 
 #include <Standard_Handle.hxx>
 
 #include <IntAna_Curve.hxx>
 #include <IntPatch_Line.hxx>
 #include <IntPatch_SequenceOfPoint.hxx>
 #include <TColStd_ListOfReal.hxx>
 
 class IntPatch_Point;
 class IntPatch_ALine;
 
 DEFINE_STANDARD_HANDLE(IntPatch_ALine, IntPatch_Line)
 
 //! Implementation of an intersection line described by a
 //! parametrized curve.
 class IntPatch_ALine : public IntPatch_Line
 {
 
 public:
 
   
   //! Creates an analytic intersection line
   //! when the transitions are In or Out.
   Standard_EXPORT IntPatch_ALine(const IntAna_Curve& C, const Standard_Boolean Tang, const IntSurf_TypeTrans Trans1, const IntSurf_TypeTrans Trans2);
   
   //! Creates an analytic intersection line
   //! when the transitions are Touch.
   Standard_EXPORT IntPatch_ALine(const IntAna_Curve& C, const Standard_Boolean Tang, const IntSurf_Situation Situ1, const IntSurf_Situation Situ2);
   
   //! Creates an analytic intersection line
   //! when the transitions are Undecided.
   Standard_EXPORT IntPatch_ALine(const IntAna_Curve& C, const Standard_Boolean Tang);
   
   //! To add a vertex in the list.
   Standard_EXPORT void AddVertex (const IntPatch_Point& Pnt);
   
   //! Replaces the element of range Index in the list
   //! of points.
     void Replace (const Standard_Integer Index, const IntPatch_Point& Pnt);
   
     void SetFirstPoint (const Standard_Integer IndFirst);
   
     void SetLastPoint (const Standard_Integer IndLast);
   
   //! Returns the first parameter on the intersection line.
   //! If IsIncluded returns True, Value and D1 methods can
   //! be call with a parameter equal to FirstParameter.
   //! Otherwise, the parameter must be greater than
   //! FirstParameter.
     Standard_Real FirstParameter (Standard_Boolean& IsIncluded) const;
   
   //! Returns the last parameter on the intersection line.
   //! If IsIncluded returns True, Value and D1 methods can
   //! be call with a parameter equal to LastParameter.
   //! Otherwise, the parameter must be less than LastParameter.
     Standard_Real LastParameter (Standard_Boolean& IsIncluded) const;
   
   //! Returns the point of parameter U on the analytic
   //! intersection line.
     gp_Pnt Value (const Standard_Real U);
   
   //! Returns Standard_True when the derivative at parameter U
   //! is defined on the analytic intersection line.
   //! In that case, Du is the derivative.
   //! Returns Standard_False when it is not possible to
   //! evaluate the derivative.
   //! In both cases, P is the point at parameter U on the
   //! intersection.
     Standard_Boolean D1 (const Standard_Real U, gp_Pnt& P, gp_Vec& Du);
   
   //! Tries to find the parameters of the point P on the curve.
   //! If the method returns False, the "projection" is
   //! impossible.
   //! If the method returns True at least one parameter has been found.
   //! theParams is always sorted in ascending order.
   void FindParameter(const gp_Pnt& P,
                      TColStd_ListOfReal& theParams) const;
   
   //! Returns True if the line has a known First point.
   //! This point is given by the method FirstPoint().
     Standard_Boolean HasFirstPoint() const;
   
   //! Returns True if the line has a known Last point.
   //! This point is given by the method LastPoint().
     Standard_Boolean HasLastPoint() const;
   
   //! Returns the IntPoint corresponding to the FirstPoint.
   //! An exception is raised when HasFirstPoint returns False.
     const IntPatch_Point& FirstPoint() const;
   
   //! Returns the IntPoint corresponding to the LastPoint.
   //! An exception is raised when HasLastPoint returns False.
     const IntPatch_Point& LastPoint() const;
   
     Standard_Integer NbVertex() const;
   
   //! Returns the vertex of range Index on the line.
     const IntPatch_Point& Vertex (const Standard_Integer Index) const;
   
   //! Allows modifying the vertex with index theIndex on the line.
   IntPatch_Point& ChangeVertex(const Standard_Integer theIndex)
   {
     return svtx.ChangeValue(theIndex);
   }
 
   //! Set the parameters of all the vertex on the line.
   //! if a vertex is already in the line,
   //! its parameter is modified
   //! else a new point in the line is inserted.
   Standard_EXPORT void ComputeVertexParameters (const Standard_Real Tol);
   
   Standard_EXPORT const IntAna_Curve& Curve() const;
 
 
 
 
   DEFINE_STANDARD_RTTIEXT(IntPatch_ALine,IntPatch_Line)
 
 protected:
 
 
 
 
 private:
 
 
   IntAna_Curve curv;
   Standard_Boolean fipt;
   Standard_Boolean lapt;
   Standard_Integer indf;
   Standard_Integer indl;
   IntPatch_SequenceOfPoint svtx;
 
 
 };
 
 
 #include <IntPatch_ALine.lxx>
 
 
 
 
 
 #endif // _IntPatch_ALine_HeaderFile

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