OCCT

// Created on: 1995-11-02
// Created by: Jing Cheng MEI
// 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 _BRepBuilderAPI_FindPlane_HeaderFile
#define _BRepBuilderAPI_FindPlane_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>

class Geom_Plane;
class TopoDS_Shape;

//! Describes functions to find the plane in which the edges
//! of a given shape are located.
//! A FindPlane object provides a framework for:
//! -   extracting the edges of a given shape,
//! -   implementing the construction algorithm, and
//! -   consulting the result.
class BRepBuilderAPI_FindPlane
{
public:
  DEFINE_STANDARD_ALLOC

  //! Initializes an empty algorithm. The function Init is then used to define the shape.
  Standard_EXPORT BRepBuilderAPI_FindPlane();

  //! Constructs the plane containing the edges of the shape S.
  //! A plane is built only if all the edges are within a distance
  //! of less than or equal to tolerance from a planar surface.
  //! This tolerance value is equal to the larger of the following two values:
  //! -   Tol, where the default value is negative, or
  //! -   the largest of the tolerance values assigned to the individual edges of S.
  //! Use the function Found to verify that a plane is built.
  //! The resulting plane is then retrieved using the function Plane.
  Standard_EXPORT BRepBuilderAPI_FindPlane(const TopoDS_Shape& S, const Standard_Real Tol = -1);

  //! Constructs the plane containing the edges of the shape S.
  //! A plane is built only if all the edges are within a distance
  //! of less than or equal to tolerance from a planar surface.
  //! This tolerance value is equal to the larger of the following two values:
  //! -   Tol, where the default value is negative, or
  //! -   the largest of the tolerance values assigned to the individual edges of S.
  //! Use the function Found to verify that a plane is built.
  //! The resulting plane is then retrieved using the function Plane.
  Standard_EXPORT void Init(const TopoDS_Shape& S, const Standard_Real Tol = -1);

  //! Returns true if a plane containing the edges of the
  //! shape is found and built. Use the function Plane to consult the result.
  Standard_EXPORT Standard_Boolean Found() const;

  //! Returns the plane containing the edges of the shape.
  //! Warning
  //! Use the function Found to verify that the plane is built. If
  //! a plane is not found, Plane returns a null handle.
  Standard_EXPORT Handle(Geom_Plane) Plane() const;

protected:
private:
  Handle(Geom_Plane) myPlane;
};

#endif // _BRepBuilderAPI_FindPlane_HeaderFile