// Created on: 1995-09-21
// Created by: Philippe GIRODENGO
// 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 _StlMesh_MeshTriangle_HeaderFile
#define _StlMesh_MeshTriangle_HeaderFile

#include <Standard.hxx>
#include <Standard_Type.hxx>

#include <Standard_Integer.hxx>
#include <Standard_Real.hxx>
#include <MMgt_TShared.hxx>
class Standard_NegativeValue;


class StlMesh_MeshTriangle;
DEFINE_STANDARD_HANDLE(StlMesh_MeshTriangle, MMgt_TShared)

//! A  mesh triangle is defined with
//! three geometric vertices and an orientation
class StlMesh_MeshTriangle : public MMgt_TShared
{

public:

  
  //! empty constructor
  Standard_EXPORT StlMesh_MeshTriangle();
  
  //! create a triangle defined with the indexes of its three vertices
  //! and its orientation
  //! Raised if V1, V2 or V3 is lower than zero
  Standard_EXPORT StlMesh_MeshTriangle(const Standard_Integer V1, const Standard_Integer V2, const Standard_Integer V3, const Standard_Real Xn, const Standard_Real Yn, const Standard_Real Zn);
  
  //! get indexes of the three vertices (V1,V2,V3) and the orientation
  Standard_EXPORT void GetVertexAndOrientation (Standard_Integer& V1, Standard_Integer& V2, Standard_Integer& V3, Standard_Real& Xn, Standard_Real& Yn, Standard_Real& Zn) const;
  
  //! set indexes of the three vertices (V1,V2,V3) and the orientation
  //! Raised if V1, V2 or V3 is lower than zero
  Standard_EXPORT void SetVertexAndOrientation (const Standard_Integer V1, const Standard_Integer V2, const Standard_Integer V3, const Standard_Real Xn, const Standard_Real Yn, const Standard_Real Zn);
  
  //! get indexes of the three vertices (V1,V2,V3)
  Standard_EXPORT void GetVertex (Standard_Integer& V1, Standard_Integer& V2, Standard_Integer& V3) const;
  
  //! set indexes of the three vertices (V1,V2,V3)
  //! Raised if V1, V2 or V3 is lower than zero
  Standard_EXPORT void SetVertex (const Standard_Integer V1, const Standard_Integer V2, const Standard_Integer V3);




  DEFINE_STANDARD_RTTI(StlMesh_MeshTriangle,MMgt_TShared)

protected:




private:


  Standard_Integer MyV1;
  Standard_Integer MyV2;
  Standard_Integer MyV3;
  Standard_Real MyXn;
  Standard_Real MyYn;
  Standard_Real MyZn;


};







#endif // _StlMesh_MeshTriangle_HeaderFile