text: // Created on: 2016-03-02
  // Created by: Varvara POSKONINA
  // Copyright (c) 2016 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 _MeshVS_SensitiveQuad_HeaderFile
  #define _MeshVS_SensitiveQuad_HeaderFile
  
  #include <Select3D_SensitiveEntity.hxx>
  #include <SelectMgr_EntityOwner.hxx>
  
  #include <TColgp_Array1OfPnt.hxx>
  
  //! This class contains description of planar quadrangle and defines methods
  //! for its detection by OCCT BVH selection mechanism
  class MeshVS_SensitiveQuad : public Select3D_SensitiveEntity
  {
  public:
  
    //! Creates a new instance and initializes quadrangle vertices with the given points
    Standard_EXPORT MeshVS_SensitiveQuad (const Handle(SelectMgr_EntityOwner)& theOwner, const TColgp_Array1OfPnt& theQuadVerts);
  
    //! Creates a new instance and initializes quadrangle vertices with the given points
    Standard_EXPORT MeshVS_SensitiveQuad (const Handle(SelectMgr_EntityOwner)& theOwner,
                                          const gp_Pnt& thePnt1,
                                          const gp_Pnt& thePnt2,
                                          const gp_Pnt& thePnt3,
                                          const gp_Pnt& thePnt4);
  
    //! Returns the amount of sub-entities in sensitive
    virtual Standard_Integer NbSubElements() const Standard_OVERRIDE
    {
      return 1;
    };
  
    //! Returns a copy of this sensitive quadrangle
    Standard_EXPORT virtual Handle(Select3D_SensitiveEntity) GetConnected() Standard_OVERRIDE;
  
    //! Checks whether the box overlaps current selecting volume
    Standard_EXPORT virtual Standard_Boolean Matches (SelectBasics_SelectingVolumeManager& theMgr,
                                                      SelectBasics_PickResult& thePickResult) Standard_OVERRIDE;
  
    //! Returns center of the box
    Standard_EXPORT virtual gp_Pnt CenterOfGeometry() const Standard_OVERRIDE;
  
    //! Returns coordinates of the box
    Standard_EXPORT virtual Select3D_BndBox3d BoundingBox() Standard_OVERRIDE;
  
    DEFINE_STANDARD_RTTIEXT (MeshVS_SensitiveQuad, Select3D_SensitiveEntity)
  
  private:
  
    gp_Pnt myVertices[4];     //!< 3d coordinates of quad's corners
  };
  
  DEFINE_STANDARD_HANDLE (MeshVS_SensitiveQuad, Select3D_SensitiveEntity)
  
  #endif // _MeshVS_SensitiveQuad_HeaderFile
  