676 lines
21 KiB
C++
676 lines
21 KiB
C++
// Copyright (c) 2006,2007,2009,2010,2011 Tel-Aviv University (Israel).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Arrangement_on_surface_2/include/CGAL/Arr_observer.h $
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// $Id: Arr_observer.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Ron Wein <wein@post.tau.ac.il>
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#ifndef CGAL_ARR_OBSERVER_H
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#define CGAL_ARR_OBSERVER_H
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#include <CGAL/license/Arrangement_on_surface_2.h>
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#include <CGAL/disable_warnings.h>
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#include <CGAL/Arr_enums.h>
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/*! \file
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* Definition of the Arr_observer<Arrangement> base class.
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*/
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namespace CGAL {
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/*! \class
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* A base class for arrangement observers.
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* The Arrangement parameter corresponds to an arrangement instantiation.
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*/
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template <class Arrangement_>
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class Arr_observer
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{
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public:
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typedef Arrangement_ Arrangement_2;
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typedef Arr_observer<Arrangement_2> Self;
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typedef typename Arrangement_2::Point_2 Point_2;
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typedef typename Arrangement_2::X_monotone_curve_2 X_monotone_curve_2;
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typedef typename Arrangement_2::Vertex_handle Vertex_handle;
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typedef typename Arrangement_2::Halfedge_handle Halfedge_handle;
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typedef typename Arrangement_2::Face_handle Face_handle;
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typedef typename Arrangement_2::Ccb_halfedge_circulator
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Ccb_halfedge_circulator;
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private:
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Arrangement_2 *p_arr; // The associated arrangement.
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/*! Copy constructor - not supported. */
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Arr_observer (const Self& );
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/*! Assignment operator - not supported. */
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Self& operator= (const Self& );
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public:
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/// \name Construction and destruction functions.
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//@{
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/*! Default constructor. */
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Arr_observer () :
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p_arr (nullptr)
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{}
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/*! Constructor with an associated arrangement. */
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Arr_observer (Arrangement_2& arr) :
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p_arr (&arr)
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{
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// Register the observer object in the arrangement.
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p_arr->_register_observer (this);
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}
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/*! Destructor. */
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virtual ~Arr_observer ()
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{
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// Unregister the observer object from the arrangement.
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if (p_arr != nullptr)
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p_arr->_unregister_observer (this);
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}
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//@}
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/// \name Modifying the associated arrangement.
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//@{
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/*! Get the associated arrangement (non-const version). */
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const Arrangement_2* arrangement () const
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{
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return (p_arr);
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}
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/*! Get the associated arrangement (non-const version). */
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Arrangement_2* arrangement ()
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{
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return (p_arr);
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}
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/*!
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* Attach the observer to an arrangement.
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* \pre The observer is not already attached to an arrangement.
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*/
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void attach (Arrangement_2& arr)
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{
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// Do nothing if the associated arrangement is not changed.
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if (p_arr == &arr)
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return;
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// The observer is not already attached to an arrangement.
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CGAL_precondition (p_arr == nullptr);
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if (p_arr != nullptr)
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return;
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// Notify the concrete oberver (the sub-class) about the attachment.
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before_attach (arr);
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// Register the observer object in the new arrangement.
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p_arr = &arr;
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p_arr->_register_observer (this);
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// Notify the concrete oberver that the attachment took place.
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after_attach();
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return;
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}
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/*! Detach the observer from the arrangement. */
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void detach ()
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{
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if (p_arr == nullptr)
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return;
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// Notify the concrete oberver (the sub-class) about the detachment.
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before_detach ();
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// Unregister the observer object from the current arrangement, and mark
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// that the oberver is not attached to an arrangement.
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p_arr->_unregister_observer (this);
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p_arr = nullptr;
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// Notify the concrete oberver that the detachment took place.
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after_detach();
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return;
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}
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//@}
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/// \name Notification functions on global arrangement operations.
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//@{
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/*!
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* Notification before the arrangement is assigned with another
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* arrangement.
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* \param arr The arrangement to be copied.
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*/
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virtual void before_assign (const Arrangement_2& /* arr */)
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{}
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/*!
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* Notification after the arrangement has been assigned with another
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* arrangement.
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*/
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virtual void after_assign ()
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{}
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/*! Notification before the arrangement is cleared. */
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virtual void before_clear ()
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{}
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/*!
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* Notification after the arrangement is cleared.
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*/
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virtual void after_clear ()
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{}
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/*! Notification before a global operation modifies the arrangement. */
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virtual void before_global_change ()
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{}
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/*! Notification after a global operation is completed. */
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virtual void after_global_change ()
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{}
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//@}
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/// \name Notification functions on observer attachment or detachment.
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//@{
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/*!
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* Notification before the observer is attached to an arrangement.
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* \param arr The arrangement we are about to attach the observer to.
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*/
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virtual void before_attach (const Arrangement_2& /* arr */)
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{}
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/*!
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* Notification after the observer has been attached to an arrangement.
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*/
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virtual void after_attach ()
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{}
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/*!
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* Notification before the observer is detached from the arrangement.
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*/
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virtual void before_detach ()
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{}
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/*!
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* Notification after the observer has been detached to the arrangement.
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*/
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virtual void after_detach ()
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{}
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//@}
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/// \name Notification functions on local changes in the arrangement.
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//@{
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/*!
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* Notification before the creation of a new vertex.
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* \param p The point to be associated with the vertex.
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* This point cannot lies on the surface boundaries.
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*/
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virtual void before_create_vertex (const Point_2& /* p */)
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{}
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/*!
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* Notification after the creation of a new vertex.
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* \param v A handle to the created vertex.
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*/
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virtual void after_create_vertex (Vertex_handle /* v */)
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{}
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/*!
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* Notification before the creation of a new boundary vertex.
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* \param cv The curve incident to the surface boundary.
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* \param ind The relevant curve-end.
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* \param ps_x The boundary condition of the vertex in x.
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* \param ps_y The boundary condition of the vertex in y.
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*/
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virtual void before_create_boundary_vertex (const X_monotone_curve_2& /*cv*/,
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Arr_curve_end /* ind */,
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Arr_parameter_space /* ps_x */,
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Arr_parameter_space /* ps_y */)
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{}
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/*!
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* Notification after the creation of a new vertex at infinity.
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* \param v A handle to the created vertex.
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*/
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virtual void after_create_boundary_vertex (Vertex_handle /* v */)
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{}
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/*!
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* Notification before the creation of a new edge.
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* \param c The x-monotone curve to be associated with the edge.
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* \param v1 A handle to the first end-vertex of the edge.
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* \param v2 A handle to the second end-vertex of the edge.
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*/
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virtual void before_create_edge (const X_monotone_curve_2& /* c */,
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Vertex_handle /* v1 */,
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Vertex_handle /* v2 */)
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{}
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/*!
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* Notification after the creation of a new edge.
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* \param e A handle to one of the twin halfedges that were created.
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*/
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virtual void after_create_edge (Halfedge_handle /* e */)
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{}
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/*!
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* Notification before the modification of an existing vertex.
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* \param v A handle to the vertex to be updated.
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* \param p The point to be associated with the vertex.
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*/
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virtual void before_modify_vertex (Vertex_handle /* v */,
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const Point_2& /* p */)
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{}
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/*!
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* Notification after a vertex was modified.
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* \param v A handle to the updated vertex.
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*/
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virtual void after_modify_vertex (Vertex_handle /* v */)
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{}
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/*!
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* Notification before the modification of an existing edge.
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* \param e A handle to one of the twin halfedges to be updated.
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* \param c The x-monotone curve to be associated with the edge.
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*/
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virtual void before_modify_edge (Halfedge_handle /* e */,
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const X_monotone_curve_2& /* c */)
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{}
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/*!
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* Notification after an edge was modified.
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* \param e A handle to one of the twin halfedges that were updated.
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*/
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virtual void after_modify_edge (Halfedge_handle /* e */)
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{}
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/*!
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* Notification before the splitting of an edge into two.
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* \param e A handle to one of the existing halfedges.
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* \param v A vertex representing the split point.
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* \param c1 The x-monotone curve to be associated with the first edge.
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* \param c2 The x-monotone curve to be associated with the second edge.
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*/
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virtual void before_split_edge (Halfedge_handle /* e */,
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Vertex_handle /* v */,
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const X_monotone_curve_2& /* c1 */,
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const X_monotone_curve_2& /* c2 */)
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{}
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/*!
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* Notification after an edge was split.
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* \param e1 A handle to one of the twin halfedges forming the first edge.
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* \param e2 A handle to one of the twin halfedges forming the second edge.
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*/
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virtual void after_split_edge (Halfedge_handle /* e1 */,
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Halfedge_handle /* e2 */)
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{}
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/*!
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* Notification before the splitting of a fictitious edge into two.
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* \param e A handle to one of the existing halfedges.
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* \param v A vertex representing the unbounded split point.
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*/
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virtual void before_split_fictitious_edge (Halfedge_handle /* e */,
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Vertex_handle /* v */)
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{}
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/*!
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* Notification after a fictitious edge was split.
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* \param e1 A handle to one of the twin halfedges forming the first edge.
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* \param e2 A handle to one of the twin halfedges forming the second edge.
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*/
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virtual void after_split_fictitious_edge (Halfedge_handle /* e1 */,
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Halfedge_handle /* e2 */)
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{}
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/*!
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* Notification before the splitting of a face into two.
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* \param f A handle to the existing face.
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* \param e The new edge whose insertion causes the face to split.
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*/
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virtual void before_split_face (Face_handle /* f */,
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Halfedge_handle /* e */)
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{}
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/*!
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* Notification after a face was split.
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* \param f A handle to the face we have just split.
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* \param new_f A handle to the new face that has been created.
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* \param is_hole Whether the new face forms a hole inside f.
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*/
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virtual void after_split_face (Face_handle /* f */,
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Face_handle /* new_f */,
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bool /* is_hole */)
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{}
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/*!
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* Notification before the splitting of an outer CCB into two.
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* \param f A handle to the face that owns the outer CCB.
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* \param h A circulator representing the component boundary.
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* \param e The new edge whose removal causes the outer CCB to split.
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*/
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virtual void before_split_outer_ccb (Face_handle /* f */,
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Ccb_halfedge_circulator /* h */,
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Halfedge_handle /* e */)
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{}
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/*!
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* Notification after an outer CCB was split.
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* \param f A handle to the face that owns the outer CCBs.
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* \param h1 A circulator representing the boundary of the first component.
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* \param h2 A circulator representing the boundary of the second component.
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*/
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virtual void after_split_outer_ccb (Face_handle /* f */,
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Ccb_halfedge_circulator /* h1 */,
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Ccb_halfedge_circulator /* h2 */)
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{}
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/*!
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* Notification before the splitting of an inner CCB into two.
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* \param f A handle to the face containing the inner CCB.
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* \param h A circulator representing the component boundary.
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* \param e The new edge whose removal causes the inner CCB to split.
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*/
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virtual void before_split_inner_ccb (Face_handle /* f */,
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Ccb_halfedge_circulator /* h */,
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Halfedge_handle /* e */)
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{}
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/*!
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* Notification after an inner CCB was split.
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* \param f A handle to the face containing the inner CCBs.
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* \param h1 A circulator representing the boundary of the first component.
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* \param h2 A circulator representing the boundary of the second component.
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*/
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virtual void after_split_inner_ccb (Face_handle /* f */,
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Ccb_halfedge_circulator /* h1 */,
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Ccb_halfedge_circulator /* h2 */)
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{}
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/*!
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* Notification before the creation of a new outer CCB of a face.
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* \param f A handle to the face that owns the outer CCB.
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* \param e A halfedge along the new outer CCB.
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*/
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virtual void before_add_outer_ccb (Face_handle /* f */,
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Halfedge_handle /* e */)
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{}
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/*!
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* Notification after an outer CCB was added to a face.
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* \param h A circulator representing the boundary of the new outer CCB.
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*/
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virtual void after_add_outer_ccb (Ccb_halfedge_circulator /* h */)
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{}
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/*!
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* Notification before the creation of a new inner CCB inside a face.
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* \param f A handle to the face containing the inner CCB.
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* \param e The new halfedge that forms the new inner CCB.
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*/
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virtual void before_add_inner_ccb (Face_handle /* f */,
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Halfedge_handle /* e */)
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{}
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/*!
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* Notification after an inner CCB was created inside a face.
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* \param h A circulator representing the boundary of the new inner CCB.
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*/
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virtual void after_add_inner_ccb (Ccb_halfedge_circulator /* h */)
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{}
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/*!
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* Notification before the creation of a new isolated vertex inside a face.
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* \param f A handle to the face containing the isolated vertex.
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* \param v The isolated vertex.
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*/
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virtual void before_add_isolated_vertex (Face_handle /* f */,
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Vertex_handle /* v */)
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{}
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/*!
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* Notification after an isolated vertex was created inside a face.
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* \param v The isolated vertex.
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*/
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virtual void after_add_isolated_vertex (Vertex_handle /* v */)
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{}
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/*!
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* Notification before the merging of two edges.
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* \param e1 A handle to one of the halfedges forming the first edge.
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* \param e2 A handle to one of the halfedges forming the second edge.
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* \param c The x-monotone curve to be associated with the merged edge.
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*/
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virtual void before_merge_edge (Halfedge_handle /* e1 */,
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Halfedge_handle /* e2 */,
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const X_monotone_curve_2& /* c */)
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{}
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/*!
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* Notification after an edge was merged.
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* \param e A handle to one of the twin halfedges forming the merged edge.
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*/
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virtual void after_merge_edge (Halfedge_handle /* e */)
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{}
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/*!
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* Notification before the merging of two fictitious edges.
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* \param e1 A handle to one of the halfedges forming the first edge.
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* \param e2 A handle to one of the halfedges forming the second edge.
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*/
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virtual void before_merge_fictitious_edge (Halfedge_handle /* e1 */,
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Halfedge_handle /* e2 */)
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{}
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/*!
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* Notification after a fictitious edge was merged.
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* \param e A handle to one of the twin halfedges forming the merged edge.
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*/
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virtual void after_merge_fictitious_edge (Halfedge_handle /* e */)
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{}
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/*!
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* Notification before the merging of two faces.
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* \param f1 A handle to the first face.
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* \param f2 A handle to the second face.
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* \param e The edge whose removal causes the faces to merge.
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*/
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virtual void before_merge_face (Face_handle /* f1 */,
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Face_handle /* f2 */,
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Halfedge_handle /* e */)
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{}
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/*!
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* Notification after a face was merged.
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* \param f A handle to the merged face.
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*/
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virtual void after_merge_face (Face_handle /* f */)
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{}
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/*!
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* Notification before the merging of two outer CCBs.
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* \param f A handle to the face that owns the outer CCBs.
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* \param h1 A circulator representing the boundary of the first component.
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* \param h2 A circulator representing the boundary of the second component.
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* \param e The edge whose insertion or removal causes the CCBs to merge.
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*/
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virtual void before_merge_outer_ccb (Face_handle /* f */,
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Ccb_halfedge_circulator /* h1 */,
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Ccb_halfedge_circulator /* h2 */,
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Halfedge_handle /* e */)
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{}
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/*!
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* Notification after an outer CCB was merged.
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* \param f A handle to the face that owns the outer CCBs.
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* \param h A circulator representing the boundary of the merged component.
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*/
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virtual void after_merge_outer_ccb (Face_handle /* f */,
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Ccb_halfedge_circulator /* h */)
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{}
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/*!
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* Notification before the merging of two inner CCBs (holes).
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* \param f A handle to the face that contains the inner CCBs.
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* \param h1 A circulator representing the boundary of the first component.
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* \param h2 A circulator representing the boundary of the second component.
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* \param e The edge whose insertion causes the inner CCBs to merge.
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*/
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virtual void before_merge_inner_ccb (Face_handle /* f */,
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Ccb_halfedge_circulator /* h1 */,
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Ccb_halfedge_circulator /* h2 */,
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Halfedge_handle /* e */)
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{}
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/*!
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* Notification after an inner CCB was merged.
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* \param f A handle to the face that contains the inner CCBs.
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* \param h A circulator representing the boundary of the merged component.
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*/
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virtual void after_merge_inner_ccb (Face_handle /* f */,
|
|
Ccb_halfedge_circulator /* h */)
|
|
{}
|
|
|
|
/*!
|
|
* Notification before an outer CCB is moved from one face to another.
|
|
* \param from_f A handle to the face that currently owns the outer CCB.
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|
* \param to_f A handle to the face that should own the outer CCB.
|
|
* \param h A circulator representing the boundary of the component.
|
|
*/
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|
virtual void before_move_outer_ccb (Face_handle /* from_f */,
|
|
Face_handle /* to_f */,
|
|
Ccb_halfedge_circulator /* h */)
|
|
{}
|
|
|
|
/*!
|
|
* Notification after an outer CCB is moved from one face to another.
|
|
* \param h A circulator representing the boundary of the component.
|
|
*/
|
|
virtual void after_move_outer_ccb (Ccb_halfedge_circulator /* h */)
|
|
{}
|
|
|
|
|
|
/*!
|
|
* Notification before an inner CCB is moved from one face to another.
|
|
* \param from_f A handle to the face currently containing the inner CCB.
|
|
* \param to_f A handle to the face that should contain the inner CCB.
|
|
* \param h A circulator representing the boundary of the component.
|
|
*/
|
|
virtual void before_move_inner_ccb (Face_handle /* from_f */,
|
|
Face_handle /* to_f */,
|
|
Ccb_halfedge_circulator /* h */)
|
|
{}
|
|
|
|
/*!
|
|
* Notification after an inner CCB is moved from one face to another.
|
|
* \param h A circulator representing the boundary of the component.
|
|
*/
|
|
virtual void after_move_inner_ccb (Ccb_halfedge_circulator /* h */)
|
|
{}
|
|
|
|
/*!
|
|
* Notification before an isolated vertex is moved from one face to another.
|
|
* \param from_f A handle to the face currently containing the vertex.
|
|
* \param to_f A handle to the face that should contain the vertex.
|
|
* \param v The isolated vertex.
|
|
*/
|
|
virtual void before_move_isolated_vertex (Face_handle /* from_f */,
|
|
Face_handle /* to_f */,
|
|
Vertex_handle /* v */)
|
|
{}
|
|
|
|
/*!
|
|
* Notification after an isolated vertex is moved from one face to another.
|
|
* \param v The isolated vertex.
|
|
*/
|
|
virtual void after_move_isolated_vertex (Vertex_handle /* v */)
|
|
{}
|
|
|
|
/*!
|
|
* Notificaion before the removal of a vertex.
|
|
* \param v A handle to the vertex to be deleted.
|
|
*/
|
|
virtual void before_remove_vertex (Vertex_handle /* v */)
|
|
{}
|
|
|
|
/*!
|
|
* Notificaion after the removal of a vertex.
|
|
*/
|
|
virtual void after_remove_vertex ()
|
|
{}
|
|
|
|
/*!
|
|
* Notification before the removal of an edge.
|
|
* \param e A handle to one of the twin halfedges to be deleted.
|
|
*/
|
|
virtual void before_remove_edge (Halfedge_handle /* e */)
|
|
{}
|
|
|
|
/*!
|
|
* Notificaion after the removal of an edge.
|
|
*/
|
|
virtual void after_remove_edge ()
|
|
{}
|
|
|
|
/*!
|
|
* Notification before the removal of an outer CCB.
|
|
* \param f The face that owns the outer CCB.
|
|
* \param h A circulator representing the boundary of the component.
|
|
*/
|
|
virtual void before_remove_outer_ccb (Face_handle /* f */,
|
|
Ccb_halfedge_circulator /* h */)
|
|
{}
|
|
|
|
/*!
|
|
* Notificaion after the removal of an outer CCB.
|
|
* \param f The face that used to own the outer CCB.
|
|
*/
|
|
virtual void after_remove_outer_ccb (Face_handle /* f */)
|
|
{}
|
|
|
|
/*!
|
|
* Notification before the removal of an inner CCB.
|
|
* \param f The face containing the inner CCB.
|
|
* \param h A circulator representing the boundary of the component.
|
|
*/
|
|
virtual void before_remove_inner_ccb (Face_handle /* f */,
|
|
Ccb_halfedge_circulator /* h */)
|
|
{}
|
|
|
|
/*!
|
|
* Notificaion after the removal of an inner CCB.
|
|
* \param f The face that used to contain the inner CCB.
|
|
*/
|
|
virtual void after_remove_inner_ccb (Face_handle /* f */)
|
|
{}
|
|
|
|
//@}
|
|
|
|
};
|
|
|
|
} //namespace CGAL
|
|
|
|
#include <CGAL/enable_warnings.h>
|
|
|
|
#endif
|