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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_Point.hxx>
 #include <NCollection_Sequence.hxx>
 #include <NCollection_List.hxx>
 
 class IntPatch_Point;
 
 //! 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 bool              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 bool              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 bool 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 int Index, const IntPatch_Point& Pnt);
 
   void SetFirstPoint(const int IndFirst);
 
   void SetLastPoint(const int 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.
   double FirstParameter(bool& 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.
   double LastParameter(bool& IsIncluded) const;
 
   //! Returns the point of parameter U on the analytic
   //! intersection line.
   gp_Pnt Value(const double U);
 
   //! Returns true when the derivative at parameter U
   //! is defined on the analytic intersection line.
   //! In that case, Du is the derivative.
   //! Returns false when it is not possible to
   //! evaluate the derivative.
   //! In both cases, P is the point at parameter U on the
   //! intersection.
   bool D1(const double 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, NCollection_List<double>& theParams) const;
 
   //! Returns True if the line has a known First point.
   //! This point is given by the method FirstPoint().
   bool HasFirstPoint() const;
 
   //! Returns True if the line has a known Last point.
   //! This point is given by the method LastPoint().
   bool 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;
 
   int NbVertex() const;
 
   //! Returns the vertex of range Index on the line.
   const IntPatch_Point& Vertex(const int Index) const;
 
   //! Allows modifying the vertex with index theIndex on the line.
   IntPatch_Point& ChangeVertex(const int 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 double Tol);
 
   Standard_EXPORT const IntAna_Curve& Curve() const;
 
   DEFINE_STANDARD_RTTIEXT(IntPatch_ALine, IntPatch_Line)
 
 private:
   IntAna_Curve                         curv;
   bool                                 fipt;
   bool                                 lapt;
   int                                  indf;
   int                                  indl;
   NCollection_Sequence<IntPatch_Point> svtx;
 };
 
 #include <IntPatch_ALine.lxx>
 
 #endif // _IntPatch_ALine_HeaderFile

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