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 // Created on: 1995-03-06
 // Created by: Laurent PAINNOT
 // Copyright (c) 1995-1999 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 _Poly_Connect_HeaderFile
 #define _Poly_Connect_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <Standard_Integer.hxx>
 #include <NCollection_Array1.hxx>
 #include <TColStd_PackedMapOfInteger.hxx>
 #include <Standard_Boolean.hxx>
 class Poly_Triangulation;
 
 //! Provides an algorithm to explore, inside a triangulation, the
 //! adjacency data for a node or a triangle.
 //! Adjacency data for a node consists of triangles which
 //! contain the node.
 //! Adjacency data for a triangle consists of:
 //! -   the 3 adjacent triangles which share an edge of the triangle,
 //! -   and the 3 nodes which are the other nodes of these adjacent triangles.
 //! Example
 //! Inside a triangulation, a triangle T
 //! has nodes n1, n2 and n3.
 //! It has adjacent triangles AT1, AT2 and AT3 where:
 //! - AT1 shares the nodes n2 and n3,
 //! - AT2 shares the nodes n3 and n1,
 //! - AT3 shares the nodes n1 and n2.
 //! It has adjacent nodes an1, an2 and an3 where:
 //! - an1 is the third node of AT1,
 //! - an2 is the third node of AT2,
 //! - an3 is the third node of AT3.
 //! So triangle AT1 is composed of nodes n2, n3 and an1.
 //! There are two ways of using this algorithm.
 //! -   From a given node you can look for one triangle that
 //! passes through the node, then look for the triangles
 //! adjacent to this triangle, then the adjacent nodes. You
 //! can thus explore the triangulation step by step (functions
 //! Triangle, Triangles and Nodes).
 //! -   From a given node you can look for all the triangles
 //! that pass through the node (iteration method, using the
 //! functions Initialize, More, Next and Value).
 //! A Connect object can be seen as a tool which analyzes a
 //! triangulation and translates it into a series of triangles. By
 //! doing this, it provides an interface with other tools and
 //! applications working on basic triangles, and which do not
 //! work directly with a Poly_Triangulation.
 class Poly_Connect
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Constructs an uninitialized algorithm.
   Standard_EXPORT Poly_Connect();
 
   //! Constructs an algorithm to explore the adjacency data of
   //! nodes or triangles for the triangulation T.
   Standard_EXPORT Poly_Connect(const occ::handle<Poly_Triangulation>& theTriangulation);
 
   //! Initialize the algorithm to explore the adjacency data of
   //! nodes or triangles for the triangulation theTriangulation.
   Standard_EXPORT void Load(const occ::handle<Poly_Triangulation>& theTriangulation);
 
   //! Returns the triangulation analyzed by this tool.
   const occ::handle<Poly_Triangulation>& Triangulation() const { return myTriangulation; }
 
   //! Returns the index of a triangle containing the node at
   //! index N in the nodes table specific to the triangulation analyzed by this tool
   int Triangle(const int N) const { return myTriangles(N); }
 
   //! Returns in t1, t2 and t3, the indices of the 3 triangles
   //! adjacent to the triangle at index T in the triangles table
   //! specific to the triangulation analyzed by this tool.
   //! Warning
   //! Null indices are returned when there are fewer than 3
   //! adjacent triangles.
   void Triangles(const int T, int& t1, int& t2, int& t3) const
   {
     int index = 6 * (T - 1);
     t1        = myAdjacents(index + 1);
     t2        = myAdjacents(index + 2);
     t3        = myAdjacents(index + 3);
   }
 
   //! Returns, in n1, n2 and n3, the indices of the 3 nodes
   //! adjacent to the triangle referenced at index T in the
   //! triangles table specific to the triangulation analyzed by this tool.
   //! Warning
   //! Null indices are returned when there are fewer than 3 adjacent nodes.
   void Nodes(const int T, int& n1, int& n2, int& n3) const
   {
     int index = 6 * (T - 1);
     n1        = myAdjacents(index + 4);
     n2        = myAdjacents(index + 5);
     n3        = myAdjacents(index + 6);
   }
 
 public:
   //! Initializes an iterator to search for all the triangles
   //! containing the node referenced at index N in the nodes
   //! table, for the triangulation analyzed by this tool.
   //! The iterator is managed by the following functions:
   //! -   More, which checks if there are still elements in the iterator
   //! -   Next, which positions the iterator on the next element
   //! -   Value, which returns the current element.
   //! The use of such an iterator provides direct access to the
   //! triangles around a particular node, i.e. it avoids iterating on
   //! all the component triangles of a triangulation.
   //! Example
   //! Poly_Connect C(Tr);
   //! for
   //! (C.Initialize(n1);C.More();C.Next())
   //! {
   //! t = C.Value();
   //! }
   Standard_EXPORT void Initialize(const int N);
 
   //! Returns true if there is another element in the iterator
   //! defined with the function Initialize (i.e. if there is another
   //! triangle containing the given node).
   bool More() const { return mymore; }
 
   //! Advances the iterator defined with the function Initialize to
   //! access the next triangle.
   //! Note: There is no action if the iterator is empty (i.e. if the
   //! function More returns false).-
   Standard_EXPORT void Next();
 
   //! Returns the index of the current triangle to which the
   //! iterator, defined with the function Initialize, points. This is
   //! an index in the triangles table specific to the triangulation
   //! analyzed by this tool
   int Value() const { return mytr; }
 
 private:
   occ::handle<Poly_Triangulation> myTriangulation;
   NCollection_Array1<int>         myTriangles;
   NCollection_Array1<int>         myAdjacents;
   int                             mytr;
   int                             myfirst;
   int                             mynode;
   int                             myothernode;
   bool                            mysense;
   bool                            mymore;
   TColStd_PackedMapOfInteger      myPassedTr;
 };
 
 #endif // _Poly_Connect_HeaderFile

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