Definition

The concept StraightSkeletonBuilder_2_Visitor describes the requirements of the visitor class required by the algorithm class CGAL::Straight_skeleton_builder_2 in its third template parameter.

Has models
: CGAL::Dummy_straight_skeleton_builder_2_visitor

See also: CGAL::Straight_skeleton_builder_2

Types
typedef unspecified_type	Halfedge_const_handle
	A constant handle to a straight skeleton halfedge.

typedef unspecified_type	Vertex_const_handle
	A constant handle to a straight skeleton vertex.

Operations
void	on_contour_edge_entered (const Halfedge_const_handle &) const
	Called for each contour halfedge added to the skeleton).

void	on_initialization_started (std::size_t number_of_vertices) const
	Called before the initialization stage (when initial events are discovered) is started.

void	on_initial_events_collected (const Vertex_const_handle &v, bool is_reflex, bool is_degenerate) const
	Called after the initial events involving the contour vertex `v` have been discovered.

void	on_edge_event_created (const Vertex_const_handle &node0, const Vertex_const_handle &node1) const
	Called after an edge event for nodes `node0` and `node1` has been discovered and put on the queue for later processing.

void	on_split_event_created (const Vertex_const_handle &node) const
	Called after a slipt event for node `node` has been discovered and put on the queue for later processing.

void	on_pseudo_split_event_created (const Vertex_const_handle &node0, const Vertex_const_handle &node1) const
	Called after a pseudo slipt event for nodes `node0` and `node1` has been discovered and put on the queue for later processing.

void	on_initialization_finished () const
	Called after all initial events have been discovered.

void	on_propagation_started () const
	Called before the propagation stage (when events are popped off the queue and processed) is started.

void	on_anihiliation_event_processed (const Vertex_const_handle &node0, const Vertex_const_handle &node1) const
	Called after an annihilation event for nodes `node0` and `node1` has been processed.

void	on_edge_event_processed (const Vertex_const_handle &seed0, const Vertex_const_handle &seed1, const Vertex_const_handle &newnode) const
	Called after an edge for nodes `seed0` and `seed1` has been processed.

void	on_split_event_processed (const Vertex_const_handle &seed, const Vertex_const_handle &newnode0, const Vertex_const_handle &newnode1) const
	Called after a split event for node `seed` has been processed.

void	on_pseudo_split_event_processed (const Vertex_const_handle &seed0, const Vertex_const_handle &seed1, const Vertex_const_handle &newnode0, const Vertex_const_handle &newnode1) const
	Called after a pseudo split event for nodes `seed0` and `seed1` has been processed.

void	on_vertex_processed (const Vertex_const_handle &v) const
	Called after vertex `v` has been marked as already processed.

void	on_propagation_finished () const
	Called after all events have been processed.

void	on_cleanup_started () const
	Called when the skeleton clean up (when multiple nodes are merged) is started.

void	on_cleanup_finished () const
	Called when clean up finished.

void	on_algorithm_finished (bool finished_ok) const
	Called when the algorithm terminated.

void	on_error (char const *msg) const
	Called whenever an error was detected.

Member Function Documentation

◆ on_algorithm_finished()

void StraightSkeletonBuilder_2_Visitor::on_algorithm_finished ( bool finished_ok ) const

Called when the algorithm terminated.

finished_ok is false if it terminated before completion or the resulting skeleton was found to be invalid.

◆ on_anihiliation_event_processed()

void StraightSkeletonBuilder_2_Visitor::on_anihiliation_event_processed	(	const Vertex_const_handle &	node0,
		const Vertex_const_handle &	node1
	)		const

Called after an annihilation event for nodes node0 and node1 has been processed.

A new skeleton edge between these nodes has been added.

◆ on_edge_event_processed()

void StraightSkeletonBuilder_2_Visitor::on_edge_event_processed	(	const Vertex_const_handle &	seed0,
		const Vertex_const_handle &	seed1,
		const Vertex_const_handle &	newnode
	)		const

Called after an edge for nodes seed0 and seed1 has been processed.

Skeleton vertex newnode and edges from node0 to newnode and node1 to newnode has been added.

◆ on_error()

void StraightSkeletonBuilder_2_Visitor::on_error ( char const * msg ) const

Called whenever an error was detected.

msg is whatever error message accompanies the error. This pointer can be null.

◆ on_pseudo_split_event_processed()

void StraightSkeletonBuilder_2_Visitor::on_pseudo_split_event_processed	(	const Vertex_const_handle &	seed0,
		const Vertex_const_handle &	seed1,
		const Vertex_const_handle &	newnode0,
		const Vertex_const_handle &	newnode1
	)		const

Called after a pseudo split event for nodes seed0 and seed1 has been processed.

Skeleton vertices newnode0 and newnode1 have been added. Skeleton edges from seed0 to newnode0 and seed1 to newnode1 has been added.

◆ on_split_event_processed()

void StraightSkeletonBuilder_2_Visitor::on_split_event_processed	(	const Vertex_const_handle &	seed,
		const Vertex_const_handle &	newnode0,
		const Vertex_const_handle &	newnode1
	)		const

Called after a split event for node seed has been processed.

Skeleton vertices newnode0 and newnode1 have been added. An skeleton edge from seed to newnode0 has been added. In the final skeleton, newnode1 is removed and only newnode0 remains.