932 lines
29 KiB
C++
932 lines
29 KiB
C++
// Copyright (c) 2006-2008 Fernando Luis Cacciola Carballal. 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/Straight_skeleton_2/include/CGAL/Straight_skeleton_builder_2.h $
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// $Id: Straight_skeleton_builder_2.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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// Author(s) : Fernando Cacciola <fernando_cacciola@ciudad.com.ar>
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//
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#ifndef CGAL_STRAIGHT_SKELETON_BUILDER_2_H
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#define CGAL_STRAIGHT_SKELETON_BUILDER_2_H 1
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#include <CGAL/license/Straight_skeleton_2.h>
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#include <CGAL/disable_warnings.h>
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#include <list>
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#include <queue>
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#include <exception>
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#include <string>
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#include <map>
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#include <boost/tuple/tuple.hpp>
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#include <boost/intrusive_ptr.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/scoped_ptr.hpp>
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#include <CGAL/algorithm.h>
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#include <CGAL/Straight_skeleton_2/Straight_skeleton_aux.h>
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#include <CGAL/Straight_skeleton_2/Straight_skeleton_builder_events_2.h>
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#include <CGAL/Straight_skeleton_2.h>
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#include <CGAL/Straight_skeleton_builder_traits_2.h>
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#include <CGAL/HalfedgeDS_const_decorator.h>
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#include <CGAL/enum.h>
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namespace CGAL {
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template<class SSkel_>
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struct Dummy_straight_skeleton_builder_2_visitor
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{
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typedef SSkel_ SSkel ;
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typedef typename SSkel::Halfedge_const_handle Halfedge_const_handle ;
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typedef typename SSkel::Vertex_const_handle Vertex_const_handle ;
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void on_contour_edge_entered ( Halfedge_const_handle const& ) const {}
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void on_initialization_started( std::size_t /* size_of_vertices */ ) const {}
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void on_initial_events_collected( Vertex_const_handle const& , bool /* is_reflex */, bool /*is_degenerate*/ ) const {}
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void on_edge_event_created( Vertex_const_handle const& /* lnode */
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, Vertex_const_handle const& /* rnode */
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) const {}
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void on_split_event_created( Vertex_const_handle const& ) const {}
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void on_pseudo_split_event_created( Vertex_const_handle const& /* lnode */
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, Vertex_const_handle const& /* rnode */
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) const {}
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void on_initialization_finished() const {}
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void on_propagation_started() const {}
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void on_anihiliation_event_processed ( Vertex_const_handle const& /* node0 */
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, Vertex_const_handle const& /* node1 */
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) const {}
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void on_edge_event_processed( Vertex_const_handle const& /* lseed */
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, Vertex_const_handle const& /* rseed */
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, Vertex_const_handle const& /* node */
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) const {}
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void on_split_event_processed( Vertex_const_handle const& /* seed */
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, Vertex_const_handle const& /* node0 */
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, Vertex_const_handle const& /* node1 */
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) const {}
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void on_pseudo_split_event_processed( Vertex_const_handle const& /* lseed */
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, Vertex_const_handle const& /* rseed */
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, Vertex_const_handle const& /* node0 */
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, Vertex_const_handle const& /* node1 */
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) const {}
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void on_vertex_processed( Vertex_const_handle const& ) const {}
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void on_propagation_finished() const {}
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void on_cleanup_started() const {}
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void on_cleanup_finished() const {}
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void on_algorithm_finished ( bool /* finished_ok */ ) const {}
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void on_error( char const* ) const {}
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} ;
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template<class Traits_, class SSkel_, class Visitor_ = Dummy_straight_skeleton_builder_2_visitor<SSkel_> >
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class Straight_skeleton_builder_2
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{
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public:
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typedef Traits_ Traits ;
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typedef SSkel_ SSkel ;
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typedef Visitor_ Visitor ;
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typedef boost::shared_ptr<SSkel> SSkelPtr ;
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private :
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typedef typename Traits::Kernel K ;
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typedef typename Traits::FT FT ;
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typedef typename Traits::Point_2 Point_2 ;
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typedef typename Traits::Vector_2 Vector_2 ;
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typedef typename Traits::Direction_2 Direction_2 ;
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typedef typename Traits::Segment_2 Segment_2 ;
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typedef typename Traits::Trisegment_2 Trisegment_2 ;
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typedef typename Traits::Trisegment_2_ptr Trisegment_2_ptr ;
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typedef typename SSkel::Vertex Vertex ;
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typedef typename SSkel::Halfedge Halfedge ;
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typedef typename SSkel::Face Face ;
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typedef typename SSkel::Vertex_const_handle Vertex_const_handle ;
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typedef typename SSkel::Halfedge_const_handle Halfedge_const_handle ;
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typedef typename SSkel::Face_const_handle Face_const_handle ;
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typedef typename SSkel::Vertex_const_iterator Vertex_const_iterator ;
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typedef typename SSkel::Halfedge_const_iterator Halfedge_const_iterator ;
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typedef typename SSkel::Face_const_iterator Face_const_iterator ;
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typedef typename SSkel::Vertex_handle Vertex_handle ;
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typedef typename SSkel::Halfedge_handle Halfedge_handle ;
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typedef typename SSkel::Face_handle Face_handle ;
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typedef typename SSkel::Vertex_iterator Vertex_iterator ;
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typedef typename SSkel::Halfedge_iterator Halfedge_iterator ;
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typedef typename SSkel::Face_iterator Face_iterator ;
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typedef typename Vertex::Halfedge_around_vertex_circulator Halfedge_around_vertex_circulator ;
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typedef typename SSkel::size_type size_type ;
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typedef CGAL_SS_i::Triedge<Halfedge_handle> Triedge ;
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typedef CGAL_SS_i::Event_2 <SSkel,Traits> Event ;
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typedef CGAL_SS_i::Edge_event_2 <SSkel,Traits> EdgeEvent ;
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typedef CGAL_SS_i::Split_event_2 <SSkel,Traits> SplitEvent ;
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typedef CGAL_SS_i::Pseudo_split_event_2<SSkel,Traits> PseudoSplitEvent ;
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typedef boost::intrusive_ptr<Event> EventPtr ;
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typedef std::pair<Vertex_handle,Vertex_handle> Vertex_handle_pair ;
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typedef std::vector<EventPtr> EventPtr_Vector ;
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typedef std::vector<Halfedge_handle> Halfedge_handle_vector ;
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typedef std::vector<Vertex_handle> Vertex_handle_vector ;
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typedef std::vector<Vertex_handle_pair> Vertex_handle_pair_vector ;
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typedef typename Halfedge_handle_vector ::iterator Halfedge_handle_vector_iterator ;
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typedef typename Vertex_handle_vector ::iterator Vertex_handle_vector_iterator ;
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typedef typename Vertex_handle_pair_vector::iterator Vertex_handle_pair_vector_iterator ;
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typedef typename EventPtr_Vector::const_iterator event_const_iterator ;
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typedef Straight_skeleton_builder_2<Traits,SSkel,Visitor> Self ;
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typedef typename Halfedge::Base_base HBase_base ;
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typedef typename Halfedge::Base HBase ;
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typedef typename Vertex::Base VBase ;
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typedef typename Face::Base FBase ;
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enum Site { AT_SOURCE = -1 , INSIDE = 0, AT_TARGET = +1 } ;
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struct Multinode : public Ref_counted_base
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{
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Multinode ( Halfedge_handle b, Halfedge_handle e )
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:
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begin(b)
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,end (e)
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,v (b->vertex())
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,size (0)
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{}
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Halfedge_handle begin ;
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Halfedge_handle end ;
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Vertex_handle v ;
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std::size_t size ;
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Halfedge_handle_vector bisectors_to_relink ;
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Halfedge_handle_vector bisectors_to_remove ;
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Vertex_handle_vector nodes_to_remove ;
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} ;
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typedef boost::intrusive_ptr<Multinode> MultinodePtr ;
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struct MultinodeComparer
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{
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bool operator() ( MultinodePtr const& x, MultinodePtr const& y ) { return x->size > y->size ; }
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} ;
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typedef std::vector<MultinodePtr> MultinodeVector ;
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struct Halfedge_ID_compare : CGAL::cpp98::binary_function<bool,Halfedge_handle,Halfedge_handle>
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{
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bool operator() ( Halfedge_handle const& aA, Halfedge_handle const& aB ) const
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{
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return aA->id() < aB->id() ;
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}
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} ;
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public:
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Straight_skeleton_builder_2 ( boost::optional<FT> aMaxTime = boost::none, Traits const& = Traits(), Visitor const& aVisitor = Visitor() ) ;
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SSkelPtr construct_skeleton( bool aNull_if_failed = true ) ;
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private :
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class Event_compare : public CGAL::cpp98::binary_function<bool,EventPtr,EventPtr>
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{
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public:
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Event_compare ( Self const* aBuilder ) : mBuilder(aBuilder) {}
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bool operator() ( EventPtr const& aA, EventPtr const& aB ) const
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{
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return mBuilder->CompareEvents(aA,aB) == LARGER ;
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}
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private:
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Self const* mBuilder ;
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} ;
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typedef std::priority_queue<EventPtr,std::vector<EventPtr>,Event_compare> PQ ;
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struct Vertex_data : public Ref_counted_base
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{
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Vertex_data ( Vertex_handle aVertex, Event_compare const& aComparer )
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:
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mVertex(aVertex)
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, mIsReflex(false)
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, mIsDegenerate(false)
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, mIsProcessed(false)
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, mIsExcluded(false)
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, mPrevInLAV(-1)
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, mNextInLAV(-1)
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, mNextSplitEventInMainPQ(false)
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, mSplitEvents(aComparer)
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{}
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Vertex_handle mVertex ;
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bool mIsReflex ;
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bool mIsDegenerate ;
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bool mIsProcessed ;
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bool mIsExcluded ;
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int mPrevInLAV ;
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int mNextInLAV ;
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bool mNextSplitEventInMainPQ;
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PQ mSplitEvents ;
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Triedge mTriedge ; // Here, E0,E1 corresponds to the vertex (unlike *event* triedges)
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Trisegment_2_ptr mTrisegment ; // Skeleton nodes cache the full trisegment tree that defines the originating event
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} ;
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typedef boost::intrusive_ptr<Vertex_data> Vertex_data_ptr ;
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private :
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Halfedge_handle validate( Halfedge_handle aH ) const ;
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Vertex_handle validate( Vertex_handle aH ) const ;
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void InitVertexData( Vertex_handle aV )
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{
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mVertexData.push_back( Vertex_data_ptr( new Vertex_data(aV,mEventCompare) ) ) ;
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}
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Vertex_data const& GetVertexData( Vertex_const_handle aV ) const
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{
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CGAL_precondition( handle_assigned(aV) ) ;
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return *mVertexData[aV->id()];
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}
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Vertex_data& GetVertexData( Vertex_const_handle aV )
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{
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CGAL_precondition( handle_assigned(aV) ) ;
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return *mVertexData[aV->id()];
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}
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Vertex_handle GetVertex ( int aIdx )
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{
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CGAL_precondition(aIdx>=0);
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return mVertexData[aIdx]->mVertex ;
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}
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// Null if aV is a contour or infinite node
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Trisegment_2_ptr const& GetTrisegment ( Vertex_handle aV ) const
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{
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return GetVertexData(aV).mTrisegment ;
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}
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void SetTrisegment ( Vertex_handle aV, Trisegment_2_ptr const& aTrisegment )
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{
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GetVertexData(aV).mTrisegment = aTrisegment ;
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}
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// Null if aV is a contour node
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Triedge const& GetVertexTriedge ( Vertex_handle aV ) const
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{
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return GetVertexData(aV).mTriedge ;
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}
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void SetVertexTriedge ( Vertex_handle aV, Triedge const& aTriedge )
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{
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GetVertexData(aV).mTriedge = aTriedge ;
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}
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Segment_2 CreateSegment ( Halfedge_const_handle aH ) const
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{
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Point_2 s = aH->opposite()->vertex()->point() ;
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Point_2 t = aH->vertex()->point() ;
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return K().construct_segment_2_object()(s,t);
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}
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Vector_2 CreateVector ( Halfedge_const_handle aH ) const
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{
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Point_2 s = aH->opposite()->vertex()->point() ;
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Point_2 t = aH->vertex()->point() ;
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return K().construct_vector_2_object()(s,t);
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}
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Direction_2 CreateDirection ( Halfedge_const_handle aH ) const
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{
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return K().construct_direction_2_object()( CreateVector(aH) );
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}
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Trisegment_2_ptr CreateTrisegment ( Triedge const& aTriedge ) const
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{
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CGAL_precondition(aTriedge.is_valid() && aTriedge.is_skeleton());
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Trisegment_2_ptr r = Construct_ss_trisegment_2(mTraits)(CreateSegment(aTriedge.e0())
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,CreateSegment(aTriedge.e1())
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,CreateSegment(aTriedge.e2())
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);
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CGAL_STSKEL_BUILDER_TRACE(5,"Trisegment for " << aTriedge << ":" << r ) ;
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CGAL_postcondition_msg((r!= Trisegment_2_ptr()), "Unable to determine edges collinearity");
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return r ;
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}
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Trisegment_2_ptr CreateTrisegment ( Triedge const& aTriedge, Vertex_handle aLSeed ) const
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{
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Trisegment_2_ptr r = CreateTrisegment( aTriedge ) ;
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r->set_child_l( GetTrisegment(aLSeed) ) ;
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return r ;
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}
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Trisegment_2_ptr CreateTrisegment ( Triedge const& aTriedge, Vertex_handle aLSeed, Vertex_handle aRSeed ) const
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{
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Trisegment_2_ptr r = CreateTrisegment( aTriedge ) ;
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r->set_child_l( GetTrisegment(aLSeed) ) ;
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r->set_child_r( GetTrisegment(aRSeed) ) ;
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return r ;
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}
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Vertex_handle GetPrevInLAV ( Vertex_handle aV )
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{
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return GetVertex ( GetVertexData(aV).mPrevInLAV ) ;
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}
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Vertex_handle GetNextInLAV ( Vertex_handle aV )
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{
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return GetVertex ( GetVertexData(aV).mNextInLAV ) ;
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}
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void SetPrevInLAV ( Vertex_handle aV, Vertex_handle aPrev )
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{
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GetVertexData(aV).mPrevInLAV = aPrev->id();
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}
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void SetNextInLAV ( Vertex_handle aV, Vertex_handle aPrev )
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{
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GetVertexData(aV).mNextInLAV = aPrev->id();
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}
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Halfedge_handle GetEdgeEndingAt ( Vertex_handle aV )
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{
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return GetVertexTriedge(aV).e0();
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}
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Halfedge_handle GetEdgeStartingAt ( Vertex_handle aV )
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{
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return GetEdgeEndingAt( GetNextInLAV(aV) ) ;
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}
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void Exclude ( Vertex_handle aV )
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{
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GetVertexData(aV).mIsExcluded = true ;
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}
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bool IsExcluded ( Vertex_const_handle aV ) const
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{
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return GetVertexData(aV).mIsExcluded ;
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}
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void SetIsReflex ( Vertex_handle aV )
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{
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GetVertexData(aV).mIsReflex = true ;
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}
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bool IsReflex ( Vertex_handle aV )
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{
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return GetVertexData(aV).mIsReflex ;
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}
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void SetIsDegenerate ( Vertex_handle aV )
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{
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GetVertexData(aV).mIsDegenerate = true ;
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}
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bool IsDegenerate ( Vertex_handle aV )
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{
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return GetVertexData(aV).mIsDegenerate ;
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}
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void SetIsProcessed ( Vertex_handle aV )
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{
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GetVertexData(aV).mIsProcessed = true ;
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mVisitor.on_vertex_processed(aV);
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}
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bool IsConvex ( Vertex_handle aV )
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{
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Vertex_data const& lData = GetVertexData(aV) ;
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return !lData.mIsReflex && !lData.mIsDegenerate ;
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}
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bool IsProcessed ( Vertex_handle aV )
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{
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return GetVertexData(aV).mIsProcessed ;
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}
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void AddSplitEvent ( Vertex_handle aV, EventPtr aEvent )
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{
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CGAL_STSKEL_BUILDER_TRACE(2, "V" << aV->id() << " PQ: " << *aEvent);
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GetVertexData(aV).mSplitEvents.push(aEvent);
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}
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EventPtr PopNextSplitEvent ( Vertex_handle aV )
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{
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EventPtr rEvent ;
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Vertex_data& lData = GetVertexData(aV) ;
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if ( !lData.mNextSplitEventInMainPQ )
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{
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PQ& lPQ = lData.mSplitEvents ;
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if ( !lPQ.empty() )
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{
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rEvent = lPQ.top();
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lPQ.pop();
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lData.mNextSplitEventInMainPQ = true ;
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}
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}
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return rEvent ;
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}
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void AllowNextSplitEvent ( Vertex_handle aV )
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{
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GetVertexData(aV).mNextSplitEventInMainPQ = false ;
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}
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void InsertEventInPQ( EventPtr aEvent ) ;
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EventPtr PopEventFromPQ() ;
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bool ExistEvent ( Trisegment_2_ptr const& aS )
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{
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return Do_ss_event_exist_2(mTraits)(aS,mMaxTime);
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}
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bool IsOppositeEdgeFacingTheSplitSeed( Vertex_handle aSeed, Halfedge_handle aOpposite ) const
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{
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if ( aSeed->is_skeleton() )
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return Is_edge_facing_ss_node_2(mTraits)( GetTrisegment(aSeed), CreateSegment(aOpposite) ) ;
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else return Is_edge_facing_ss_node_2(mTraits)( aSeed->point() , CreateSegment(aOpposite) ) ;
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}
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Oriented_side EventPointOrientedSide( Event const& aEvent
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, Halfedge_const_handle aE0
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, Halfedge_const_handle aE1
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, Vertex_handle aV01
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, bool aE0isPrimary
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) const
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{
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return Oriented_side_of_event_point_wrt_bisector_2(mTraits)( aEvent.trisegment()
|
|
, CreateSegment(aE0)
|
|
, CreateSegment(aE1)
|
|
, GetTrisegment(aV01) // Can be null
|
|
, aE0isPrimary
|
|
) ;
|
|
}
|
|
|
|
Comparison_result CompareEvents ( Trisegment_2_ptr const& aA, Trisegment_2_ptr const& aB ) const
|
|
{
|
|
return Compare_ss_event_times_2(mTraits)(aA,aB) ;
|
|
}
|
|
|
|
Comparison_result CompareEvents ( EventPtr const& aA, EventPtr const& aB ) const
|
|
{
|
|
return aA->triedge() != aB->triedge() ? CompareEvents( aA->trisegment(), aB->trisegment() ) : EQUAL ;
|
|
}
|
|
|
|
bool AreEventsSimultaneous( Trisegment_2_ptr const& x, Trisegment_2_ptr const& y ) const
|
|
{
|
|
return Are_ss_events_simultaneous_2(mTraits)(x,y) ;
|
|
}
|
|
|
|
bool AreEventsSimultaneous( EventPtr const& x, EventPtr const& y ) const
|
|
{
|
|
return AreEventsSimultaneous(x->trisegment(),y->trisegment());
|
|
}
|
|
|
|
bool AreContourNodesCoincident( Vertex_handle aX, Vertex_handle aY ) const
|
|
{
|
|
CGAL_precondition( aX->is_contour() );
|
|
CGAL_precondition( aY->is_contour() );
|
|
|
|
return CGAL::compare_xy(aX->point(),aY->point()) == EQUAL ;
|
|
}
|
|
|
|
bool AreSkeletonNodesCoincident( Vertex_handle aX, Vertex_handle aY ) const
|
|
{
|
|
CGAL_precondition( aX->is_skeleton() );
|
|
CGAL_precondition( aY->is_skeleton() );
|
|
CGAL_precondition( !aX->has_infinite_time() );
|
|
CGAL_precondition( !aY->has_infinite_time() );
|
|
|
|
return AreEventsSimultaneous( GetTrisegment(aX), GetTrisegment(aY) ) ;
|
|
}
|
|
|
|
Comparison_result CompareEvents( Trisegment_2_ptr const& aTrisegment, Vertex_handle aSeedNode ) const
|
|
{
|
|
return aSeedNode->is_skeleton() ? aSeedNode->has_infinite_time() ? SMALLER
|
|
: CompareEvents( aTrisegment, GetTrisegment(aSeedNode) )
|
|
: LARGER ;
|
|
}
|
|
|
|
void SetBisectorSlope ( Halfedge_handle aBisector, Sign aSlope )
|
|
{
|
|
aBisector->HBase_base::set_slope(aSlope);
|
|
}
|
|
|
|
void SetBisectorSlope ( Vertex_handle aA, Vertex_handle aB )
|
|
{
|
|
Halfedge_handle lOBisector = aA->primary_bisector();
|
|
Halfedge_handle lIBisector = lOBisector->opposite();
|
|
|
|
CGAL_precondition( !aA->is_contour() || !aB->is_contour() ) ;
|
|
|
|
if ( aA->is_contour() )
|
|
{
|
|
SetBisectorSlope(lOBisector,POSITIVE);
|
|
SetBisectorSlope(lIBisector,NEGATIVE);
|
|
}
|
|
else if ( aB->is_contour())
|
|
{
|
|
SetBisectorSlope(lOBisector,NEGATIVE);
|
|
SetBisectorSlope(lIBisector,POSITIVE);
|
|
}
|
|
else
|
|
{
|
|
if ( aA->has_infinite_time() )
|
|
{
|
|
CGAL_precondition( !aB->has_infinite_time());
|
|
|
|
SetBisectorSlope(lOBisector,NEGATIVE);
|
|
SetBisectorSlope(lIBisector,POSITIVE);
|
|
}
|
|
else if ( aB->has_infinite_time())
|
|
{
|
|
CGAL_precondition( !aA->has_infinite_time());
|
|
|
|
SetBisectorSlope(lOBisector,NEGATIVE);
|
|
SetBisectorSlope(lIBisector,POSITIVE);
|
|
}
|
|
else
|
|
{
|
|
CGAL_precondition( !aA->has_infinite_time());
|
|
CGAL_precondition( !aB->has_infinite_time());
|
|
|
|
Sign lSlope = CompareEvents(GetTrisegment(aB),GetTrisegment(aA));
|
|
SetBisectorSlope(lOBisector,lSlope);
|
|
SetBisectorSlope(lIBisector,opposite(lSlope));
|
|
}
|
|
}
|
|
}
|
|
|
|
boost::tuple<FT,Point_2> ConstructEventTimeAndPoint( Trisegment_2_ptr const& aS ) const
|
|
{
|
|
boost::optional< boost::tuple<FT,Point_2> > r = Construct_ss_event_time_and_point_2(mTraits)(aS);
|
|
CGAL_postcondition_msg(!!r, "Unable to compute skeleton node coordinates");
|
|
return *r ;
|
|
}
|
|
|
|
void SetEventTimeAndPoint( Event& aE )
|
|
{
|
|
FT lTime ;
|
|
Point_2 lP ;
|
|
boost::tie(lTime,lP) = ConstructEventTimeAndPoint(aE.trisegment());
|
|
|
|
aE.SetTimeAndPoint(lTime,lP);
|
|
}
|
|
|
|
|
|
void EraseBisector( Halfedge_handle aB )
|
|
{
|
|
CGAL_STSKEL_BUILDER_TRACE(1,"Dangling B" << aB->id() << " and B" << aB->opposite()->id() << " removed.");
|
|
|
|
mSSkel->SSkel::Base::edges_erase(aB);
|
|
}
|
|
|
|
#ifdef CGAL_STSKEL_TRACE_ON
|
|
std::string wavefront2str( Vertex_handle v )
|
|
{
|
|
std::ostringstream ss ;
|
|
|
|
ss << "N" << GetPrevInLAV(v)->id() << "->N" << v->id() << "->N" << GetNextInLAV(v)->id()
|
|
<< " E" << GetVertexTriedge(v).e0()->id() << "->E" << GetVertexTriedge(v).e1()->id() ;
|
|
|
|
return ss.str() ;
|
|
|
|
}
|
|
#endif
|
|
|
|
void Link( Halfedge_handle aH, Face_handle aF )
|
|
{
|
|
aH->HBase_base::set_face(aF);
|
|
}
|
|
|
|
void Link( Halfedge_handle aH, Vertex_handle aV )
|
|
{
|
|
aH->HBase_base::set_vertex(aV);
|
|
}
|
|
|
|
void Link( Vertex_handle aV, Halfedge_handle aH )
|
|
{
|
|
aV->VBase::set_halfedge(aH);
|
|
}
|
|
|
|
void CrossLinkFwd( Halfedge_handle aPrev, Halfedge_handle aNext )
|
|
{
|
|
aPrev->HBase_base::set_next(aNext);
|
|
aNext->HBase_base::set_prev(aPrev);
|
|
}
|
|
|
|
void CrossLink( Halfedge_handle aH, Vertex_handle aV )
|
|
{
|
|
Link(aH,aV);
|
|
Link(aV,aH);
|
|
}
|
|
|
|
Triedge GetCommonTriedge( Vertex_handle aA, Vertex_handle aB ) ;
|
|
|
|
bool AreBisectorsCoincident ( Halfedge_const_handle aA, Halfedge_const_handle aB ) const ;
|
|
|
|
EventPtr IsPseudoSplitEvent( EventPtr const& aEvent, Vertex_handle_pair aOpp, Site const& aSite ) ;
|
|
|
|
void CollectSplitEvent( Vertex_handle aNode, Triedge const& aTriedge ) ;
|
|
|
|
void CollectSplitEvents( Vertex_handle aNode, Triedge const& aPrevEventTriedge ) ;
|
|
|
|
EventPtr FindEdgeEvent( Vertex_handle aLNode, Vertex_handle aRNode, Triedge const& aPrevEventTriedge ) ;
|
|
|
|
void HandleSimultaneousEdgeEvent( Vertex_handle aA, Vertex_handle aB ) ;
|
|
|
|
void CollectNewEvents( Vertex_handle aNode, Triedge const& aPrevEventTriedge ) ;
|
|
void UpdatePQ( Vertex_handle aV, Triedge const& aPrevEventTriedge ) ;
|
|
void CreateInitialEvents();
|
|
void CreateContourBisectors();
|
|
void InitPhase();
|
|
|
|
void SetupNewNode( Vertex_handle aNode );
|
|
|
|
Vertex_handle_pair LookupOnSLAV ( Halfedge_handle aOBorder, EventPtr const& aEvent, Site& rSite ) ;
|
|
|
|
Vertex_handle ConstructEdgeEventNode ( EdgeEvent& aEvent ) ;
|
|
Vertex_handle_pair ConstructSplitEventNodes ( SplitEvent& aEvent, Vertex_handle aOppR ) ;
|
|
Vertex_handle_pair ConstructPseudoSplitEventNodes ( PseudoSplitEvent& aEvent ) ;
|
|
|
|
bool IsValidEdgeEvent ( EdgeEvent const& aEvent ) ;
|
|
bool IsValidSplitEvent ( SplitEvent const& aEvent ) ;
|
|
bool IsValidPseudoSplitEvent ( PseudoSplitEvent const& aEvent ) ;
|
|
|
|
void HandleEdgeEvent ( EventPtr aEvent ) ;
|
|
void HandleSplitEvent ( EventPtr aEvent, Vertex_handle_pair aOpp ) ;
|
|
void HandlePseudoSplitEvent ( EventPtr aEvent ) ;
|
|
void HandleSplitOrPseudoSplitEvent ( EventPtr aEvent ) ;
|
|
|
|
void InsertNextSplitEventInPQ( Vertex_handle v ) ;
|
|
void InsertNextSplitEventsInPQ() ;
|
|
|
|
bool IsProcessed( EventPtr aEvent ) ;
|
|
|
|
void Propagate();
|
|
|
|
void EraseNode ( Vertex_handle aNode ) ;
|
|
|
|
void MergeSplitNodes ( Vertex_handle_pair aSplitNodes ) ;
|
|
|
|
void RelinkBisectorsAroundMultinode( Vertex_handle const& v0, Halfedge_handle_vector& aLinks ) ;
|
|
|
|
void PreprocessMultinode( Multinode& aMN ) ;
|
|
|
|
void ProcessMultinode( Multinode& aMN, Halfedge_handle_vector& rHalfedgesToRemove , Vertex_handle_vector& rNodesToRemove ) ;
|
|
|
|
MultinodePtr CreateMultinode( Halfedge_handle begin, Halfedge_handle end ) ;
|
|
|
|
void MergeCoincidentNodes() ;
|
|
|
|
bool FinishUp();
|
|
|
|
bool Run();
|
|
|
|
private:
|
|
|
|
//Input
|
|
Traits mTraits ;
|
|
|
|
Visitor const& mVisitor ;
|
|
|
|
std::vector<Vertex_data_ptr> mVertexData ;
|
|
|
|
Vertex_handle_vector mReflexVertices ;
|
|
Halfedge_handle_vector mDanglingBisectors ;
|
|
Halfedge_handle_vector mContourHalfedges ;
|
|
|
|
std::list<Vertex_handle> mGLAV ;
|
|
|
|
Vertex_handle_pair_vector mSplitNodes ;
|
|
|
|
Event_compare mEventCompare ;
|
|
|
|
int mVertexID ;
|
|
int mEdgeID ;
|
|
int mFaceID ;
|
|
int mEventID ;
|
|
int mStepID ;
|
|
|
|
boost::optional<FT> mMaxTime ;
|
|
|
|
PQ mPQ ;
|
|
|
|
//Output
|
|
SSkelPtr mSSkel ;
|
|
|
|
private :
|
|
|
|
template<class InputPointIterator, class Converter>
|
|
void enter_valid_contour ( InputPointIterator aBegin, InputPointIterator aEnd, Converter const& cvt )
|
|
{
|
|
CGAL_STSKEL_BUILDER_TRACE(0,"Inserting Connected Component of the Boundary....");
|
|
|
|
Halfedge_handle lFirstCCWBorder ;
|
|
Halfedge_handle lPrevCCWBorder ;
|
|
Halfedge_handle lNextCWBorder ;
|
|
Vertex_handle lFirstVertex ;
|
|
Vertex_handle lPrevVertex ;
|
|
|
|
InputPointIterator lCurr = aBegin ;
|
|
// InputPointIterator lPrev = aBegin ;
|
|
|
|
int c = 0 ;
|
|
|
|
while ( lCurr != aEnd )
|
|
{
|
|
Halfedge_handle lCCWBorder = mSSkel->SSkel::Base::edges_push_back ( Halfedge(mEdgeID),Halfedge(mEdgeID+1) );
|
|
Halfedge_handle lCWBorder = lCCWBorder->opposite();
|
|
mEdgeID += 2 ;
|
|
|
|
mContourHalfedges.push_back(lCCWBorder);
|
|
|
|
Vertex_handle lVertex = mSSkel->SSkel::Base::vertices_push_back( Vertex(mVertexID++,cvt(*lCurr)) ) ;
|
|
CGAL_STSKEL_BUILDER_TRACE(1,"Vertex: V" << lVertex->id() << " at " << lVertex->point() );
|
|
InitVertexData(lVertex);
|
|
|
|
Face_handle lFace = mSSkel->SSkel::Base::faces_push_back( Face(mFaceID++) ) ;
|
|
|
|
++ c ;
|
|
|
|
lCCWBorder->HBase_base::set_face(lFace);
|
|
lFace ->FBase ::set_halfedge(lCCWBorder);
|
|
|
|
lVertex ->VBase ::set_halfedge(lCCWBorder);
|
|
lCCWBorder->HBase_base::set_vertex(lVertex);
|
|
|
|
if ( lCurr == aBegin )
|
|
{
|
|
lFirstVertex = lVertex ;
|
|
lFirstCCWBorder = lCCWBorder ;
|
|
}
|
|
else
|
|
{
|
|
SetPrevInLAV(lVertex ,lPrevVertex);
|
|
SetNextInLAV(lPrevVertex,lVertex );
|
|
|
|
SetVertexTriedge(lPrevVertex, Triedge(lPrevCCWBorder,lCCWBorder) ) ;
|
|
|
|
lCWBorder->HBase_base::set_vertex(lPrevVertex);
|
|
|
|
lCCWBorder ->HBase_base::set_prev(lPrevCCWBorder);
|
|
lPrevCCWBorder->HBase_base::set_next(lCCWBorder);
|
|
|
|
lNextCWBorder->HBase_base::set_prev(lCWBorder);
|
|
lCWBorder ->HBase_base::set_next(lNextCWBorder);
|
|
|
|
CGAL_STSKEL_BUILDER_TRACE(1,"CCW Border: E" << lCCWBorder->id() << ' ' << lPrevVertex->point() << " -> " << lVertex ->point());
|
|
CGAL_STSKEL_BUILDER_TRACE(1,"CW Border: E" << lCWBorder ->id() << ' ' << lVertex ->point() << " -> " << lPrevVertex->point() );
|
|
|
|
mVisitor.on_contour_edge_entered(lCCWBorder);
|
|
|
|
}
|
|
|
|
// lPrev = lCurr ;
|
|
|
|
++ lCurr ;
|
|
|
|
lPrevVertex = lVertex ;
|
|
lPrevCCWBorder = lCCWBorder ;
|
|
lNextCWBorder = lCWBorder ;
|
|
}
|
|
|
|
SetPrevInLAV(lFirstVertex,lPrevVertex );
|
|
SetNextInLAV(lPrevVertex ,lFirstVertex);
|
|
|
|
SetVertexTriedge( lPrevVertex, Triedge(lPrevCCWBorder,lFirstCCWBorder) ) ;
|
|
|
|
lFirstCCWBorder->opposite()->HBase_base::set_vertex(lPrevVertex);
|
|
|
|
lFirstCCWBorder->HBase_base::set_prev(lPrevCCWBorder);
|
|
lPrevCCWBorder ->HBase_base::set_next(lFirstCCWBorder);
|
|
|
|
lPrevCCWBorder ->opposite()->HBase_base::set_prev(lFirstCCWBorder->opposite());
|
|
lFirstCCWBorder->opposite()->HBase_base::set_next(lPrevCCWBorder ->opposite());
|
|
|
|
CGAL_precondition_msg(c >=3, "The contour must have at least 3 _distinct_ vertices" ) ;
|
|
|
|
CGAL_STSKEL_BUILDER_TRACE(1
|
|
, "CCW Border: E" << lFirstCCWBorder->id()
|
|
<< ' ' << lPrevVertex ->point() << " -> " << lFirstVertex->point() << '\n'
|
|
<< "CW Border: E" << lFirstCCWBorder->opposite()->id()
|
|
<< ' ' << lFirstVertex->point() << " -> " << lPrevVertex ->point()
|
|
);
|
|
|
|
mVisitor.on_contour_edge_entered(lFirstCCWBorder);
|
|
}
|
|
|
|
public:
|
|
|
|
// This compares INPUT vertices so there is no need to filter it.
|
|
struct AreVerticesEqual
|
|
{
|
|
template<class P>
|
|
bool operator() ( P const&x, P const& y ) const
|
|
{
|
|
return CGAL::compare_xy(x,y) == EQUAL ;
|
|
}
|
|
} ;
|
|
|
|
template<class InputPointIterator, class Converter>
|
|
Straight_skeleton_builder_2& enter_contour ( InputPointIterator aBegin
|
|
, InputPointIterator aEnd
|
|
, Converter const& cvt
|
|
, bool aCheckValidity = true
|
|
)
|
|
{
|
|
if ( aCheckValidity )
|
|
{
|
|
typedef typename std::iterator_traits<InputPointIterator>::value_type Input_point;
|
|
|
|
typedef std::vector<Input_point> Input_point_vector ;
|
|
|
|
// Remove coincident consecutive vertices
|
|
Input_point_vector lList;
|
|
std::unique_copy(aBegin,aEnd,std::back_inserter(lList),AreVerticesEqual());
|
|
|
|
while ( lList.size() > 0 && CGAL::compare_xy(lList.front(),lList.back()) == EQUAL )
|
|
lList.pop_back();
|
|
|
|
if ( lList.size() >= 3 )
|
|
{
|
|
enter_valid_contour(lList.begin(),lList.end(),cvt);
|
|
}
|
|
else
|
|
{
|
|
CGAL_STSKEL_BUILDER_TRACE(0,"Degenerate contour (less than 3 non-degenerate vertices).");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
enter_valid_contour(aBegin,aEnd,cvt);
|
|
}
|
|
|
|
return *this ;
|
|
}
|
|
|
|
template<class InputPointIterator>
|
|
Straight_skeleton_builder_2& enter_contour ( InputPointIterator aBegin
|
|
, InputPointIterator aEnd
|
|
, bool aCheckValidity = true
|
|
)
|
|
{
|
|
return enter_contour(aBegin, aEnd, Cartesian_converter<K,K>(), aCheckValidity);
|
|
}
|
|
|
|
} ;
|
|
|
|
} // end namespace CGAL
|
|
|
|
#include <CGAL/Straight_skeleton_2/Straight_skeleton_builder_2_impl.h>
|
|
|
|
#include <CGAL/enable_warnings.h>
|
|
|
|
#endif // CGAL_STRAIGHT_SKELETON_BUILDER_2_H //
|
|
// EOF //
|