#include <opencv2/imgproc.hpp>

Classes
struct	QuadEdge

struct	Vertex

Public Types
enum	{ PTLOC_ERROR = -2 , PTLOC_OUTSIDE_RECT = -1 , PTLOC_INSIDE = 0 , PTLOC_VERTEX = 1 , PTLOC_ON_EDGE = 2 }

enum	{ NEXT_AROUND_ORG = 0x00 , NEXT_AROUND_DST = 0x22 , PREV_AROUND_ORG = 0x11 , PREV_AROUND_DST = 0x33 , NEXT_AROUND_LEFT = 0x13 , NEXT_AROUND_RIGHT = 0x31 , PREV_AROUND_LEFT = 0x20 , PREV_AROUND_RIGHT = 0x02 }

Public Member Functions
	Subdiv2D ()

	Subdiv2D (Rect rect)

int	edgeDst (int edge, Point2f *dstpt=0) const
	Returns the edge destination.

int	edgeOrg (int edge, Point2f *orgpt=0) const
	Returns the edge origin.

int	findNearest (Point2f pt, Point2f *nearestPt=0)
	Finds the subdivision vertex closest to the given point.

int	getEdge (int edge, int nextEdgeType) const
	Returns one of the edges related to the given edge.

void	getEdgeList (std::vector< Vec4f > &edgeList) const
	Returns a list of all edges.

void	getLeadingEdgeList (std::vector< int > &leadingEdgeList) const
	Returns a list of the leading edge ID connected to each triangle.

void	getTriangleList (std::vector< Vec6f > &triangleList) const
	Returns a list of all triangles.

Point2f	getVertex (int vertex, int *firstEdge=0) const
	Returns vertex location from vertex ID.

void	getVoronoiFacetList (const std::vector< int > &idx, std::vector< std::vector< Point2f > > &facetList, std::vector< Point2f > &facetCenters)
	Returns a list of all Voronoi facets.

void	initDelaunay (Rect rect)
	Creates a new empty Delaunay subdivision.

void	insert (const std::vector< Point2f > &ptvec)
	Insert multiple points into a Delaunay triangulation.

int	insert (Point2f pt)
	Insert a single point into a Delaunay triangulation.

int	locate (Point2f pt, int &edge, int &vertex)
	Returns the location of a point within a Delaunay triangulation.

int	nextEdge (int edge) const
	Returns next edge around the edge origin.

int	rotateEdge (int edge, int rotate) const
	Returns another edge of the same quad-edge.

int	symEdge (int edge) const

Protected Member Functions
void	calcVoronoi ()

void	checkSubdiv () const

void	clearVoronoi ()

int	connectEdges (int edgeA, int edgeB)

void	deleteEdge (int edge)

void	deletePoint (int vtx)

int	isRightOf (Point2f pt, int edge) const

int	newEdge ()

int	newPoint (Point2f pt, bool isvirtual, int firstEdge=0)

void	setEdgePoints (int edge, int orgPt, int dstPt)

void	splice (int edgeA, int edgeB)

void	swapEdges (int edge)

Protected Attributes
Point2f	bottomRight
	Bottom right corner of the bounding rect.

int	freePoint

int	freeQEdge

std::vector< QuadEdge >	qedges
	All of the edges.

int	recentEdge

Point2f	topLeft
	Top left corner of the bounding rect.

bool	validGeometry

std::vector< Vertex >	vtx
	All of the vertices.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

Subdiv2D point location cases

Enumerator
PTLOC_ERROR	Point location error.
PTLOC_OUTSIDE_RECT	Point outside the subdivision bounding rect.
PTLOC_INSIDE	Point inside some facet.
PTLOC_VERTEX	Point coincides with one of the subdivision vertices.
PTLOC_ON_EDGE	Point on some edge.

◆ anonymous enum

anonymous enum

Subdiv2D edge type navigation (see: getEdge())

Enumerator
NEXT_AROUND_ORG
NEXT_AROUND_DST
PREV_AROUND_ORG
PREV_AROUND_DST
NEXT_AROUND_LEFT
NEXT_AROUND_RIGHT
PREV_AROUND_LEFT
PREV_AROUND_RIGHT

Constructor & Destructor Documentation

◆ Subdiv2D() [1/2]

cv::Subdiv2D::Subdiv2D ( )

creates an empty Subdiv2D object. To create a new empty Delaunay subdivision you need to use the initDelaunay function.

◆ Subdiv2D() [2/2]

cv::Subdiv2D::Subdiv2D ( Rect rect )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

rect	Rectangle that includes all of the 2D points that are to be added to the subdivision.

The function creates an empty Delaunay subdivision where 2D points can be added using the function insert() . All of the points to be added must be within the specified rectangle, otherwise a runtime error is raised.

Member Function Documentation

◆ calcVoronoi()

void cv::Subdiv2D::calcVoronoi ( )

protected

◆ checkSubdiv()

void cv::Subdiv2D::checkSubdiv ( ) const

protected

◆ clearVoronoi()

void cv::Subdiv2D::clearVoronoi ( )

protected

◆ connectEdges()

int cv::Subdiv2D::connectEdges	(	int	edgeA,
		int	edgeB
	)

protected

◆ deleteEdge()

void cv::Subdiv2D::deleteEdge ( int edge )

protected

◆ deletePoint()

void cv::Subdiv2D::deletePoint ( int vtx )

protected

◆ edgeDst()

int cv::Subdiv2D::edgeDst	(	int	edge,
		Point2f *	dstpt = `0`
	)		const

Returns the edge destination.

Parameters

edge	Subdivision edge ID.
dstpt	Output vertex location.

Returns: vertex ID.

◆ edgeOrg()

int cv::Subdiv2D::edgeOrg	(	int	edge,
		Point2f *	orgpt = `0`
	)		const

Returns the edge origin.

Parameters

edge	Subdivision edge ID.
orgpt	Output vertex location.

Returns: vertex ID.

◆ findNearest()

int cv::Subdiv2D::findNearest	(	Point2f	pt,
		Point2f *	nearestPt = `0`
	)

Finds the subdivision vertex closest to the given point.

Parameters

pt	Input point.
nearestPt	Output subdivision vertex point.

The function is another function that locates the input point within the subdivision. It finds the subdivision vertex that is the closest to the input point. It is not necessarily one of vertices of the facet containing the input point, though the facet (located using locate() ) is used as a starting point.

Returns: vertex ID.

◆ getEdge()

int cv::Subdiv2D::getEdge	(	int	edge,
		int	nextEdgeType
	)		const

Returns one of the edges related to the given edge.

Parameters

edge Subdivision edge ID.

nextEdgeType

Parameter specifying which of the related edges to return. The following values are possible:

NEXT_AROUND_ORG next around the edge origin ( eOnext on the picture below if e is the input edge)
NEXT_AROUND_DST next around the edge vertex ( eDnext )
PREV_AROUND_ORG previous around the edge origin (reversed eRnext )
PREV_AROUND_DST previous around the edge destination (reversed eLnext )
NEXT_AROUND_LEFT next around the left facet ( eLnext )
NEXT_AROUND_RIGHT next around the right facet ( eRnext )
PREV_AROUND_LEFT previous around the left facet (reversed eOnext )
PREV_AROUND_RIGHT previous around the right facet (reversed eDnext )

sample output

Returns: edge ID related to the input edge.

◆ getEdgeList()

void cv::Subdiv2D::getEdgeList ( std::vector< Vec4f > & edgeList ) const

Returns a list of all edges.

Parameters

edgeList Output vector.

The function gives each edge as a 4 numbers vector, where each two are one of the edge vertices. i.e. org_x = v[0], org_y = v[1], dst_x = v[2], dst_y = v[3].

◆ getLeadingEdgeList()

void cv::Subdiv2D::getLeadingEdgeList ( std::vector< int > & leadingEdgeList ) const

Returns a list of the leading edge ID connected to each triangle.

Parameters

leadingEdgeList Output vector.

The function gives one edge ID for each triangle.

◆ getTriangleList()

void cv::Subdiv2D::getTriangleList ( std::vector< Vec6f > & triangleList ) const

Returns a list of all triangles.

Parameters

triangleList Output vector.

The function gives each triangle as a 6 numbers vector, where each two are one of the triangle vertices. i.e. p1_x = v[0], p1_y = v[1], p2_x = v[2], p2_y = v[3], p3_x = v[4], p3_y = v[5].

◆ getVertex()

Point2f cv::Subdiv2D::getVertex	(	int	vertex,
		int *	firstEdge = `0`
	)		const

Returns vertex location from vertex ID.

Parameters

vertex	vertex ID.
firstEdge	Optional. The first edge ID which is connected to the vertex.

Returns: vertex (x,y)

◆ getVoronoiFacetList()

void cv::Subdiv2D::getVoronoiFacetList	(	const std::vector< int > &	idx,
		std::vector< std::vector< Point2f > > &	facetList,
		std::vector< Point2f > &	facetCenters
	)

Returns a list of all Voronoi facets.

Parameters

idx	Vector of vertices IDs to consider. For all vertices you can pass empty vector.
facetList	Output vector of the Voronoi facets.
facetCenters	Output vector of the Voronoi facets center points.

◆ initDelaunay()

void cv::Subdiv2D::initDelaunay ( Rect rect )

Creates a new empty Delaunay subdivision.

Parameters

rect	Rectangle that includes all of the 2D points that are to be added to the subdivision.

◆ insert() [1/2]

void cv::Subdiv2D::insert ( const std::vector< Point2f > & ptvec )

Insert multiple points into a Delaunay triangulation.

Parameters

ptvec Points to insert.

The function inserts a vector of points into a subdivision and modifies the subdivision topology appropriately.

◆ insert() [2/2]

int cv::Subdiv2D::insert ( Point2f pt )

Insert a single point into a Delaunay triangulation.

Parameters

pt	Point to insert.

The function inserts a single point into a subdivision and modifies the subdivision topology appropriately. If a point with the same coordinates exists already, no new point is added.

Returns: the ID of the point.

Note: If the point is outside of the triangulation specified rect a runtime error is raised.

◆ isRightOf()

int cv::Subdiv2D::isRightOf	(	Point2f	pt,
		int	edge
	)		const

protected

◆ locate()

int cv::Subdiv2D::locate	(	Point2f	pt,
		int &	edge,
		int &	vertex
	)

Returns the location of a point within a Delaunay triangulation.

Parameters

pt	Point to locate.
edge	Output edge that the point belongs to or is located to the right of it.
vertex	Optional output vertex the input point coincides with.

The function locates the input point within the subdivision and gives one of the triangle edges or vertices.

Returns

an integer which specify one of the following five cases for point location:

The point falls into some facet. The function returns PTLOC_INSIDE and edge will contain one of edges of the facet.
The point falls onto the edge. The function returns PTLOC_ON_EDGE and edge will contain this edge.
The point coincides with one of the subdivision vertices. The function returns PTLOC_VERTEX and vertex will contain a pointer to the vertex.
The point is outside the subdivision reference rectangle. The function returns PTLOC_OUTSIDE_RECT and no pointers are filled.
One of input arguments is invalid. A runtime error is raised or, if silent or "parent" error processing mode is selected, PTLOC_ERROR is returned.

◆ newEdge()

int cv::Subdiv2D::newEdge ( )

protected

◆ newPoint()

int cv::Subdiv2D::newPoint	(	Point2f	pt,
		bool	isvirtual,
		int	firstEdge = `0`
	)

protected

◆ nextEdge()

int cv::Subdiv2D::nextEdge ( int edge ) const

Returns next edge around the edge origin.

Parameters

edge	Subdivision edge ID.

Returns: an integer which is next edge ID around the edge origin: eOnext on the picture above if e is the input edge).

◆ rotateEdge()

int cv::Subdiv2D::rotateEdge	(	int	edge,
		int	rotate
	)		const

Returns another edge of the same quad-edge.

Parameters

edge	Subdivision edge ID.
rotate	Parameter specifying which of the edges of the same quad-edge as the input one to return. The following values are possible: 0 - the input edge ( e on the picture below if e is the input edge) 1 - the rotated edge ( eRot ) 2 - the reversed edge (reversed e (in green)) 3 - the reversed rotated edge (reversed eRot (in green))

Returns: one of the edges ID of the same quad-edge as the input edge.

◆ setEdgePoints()

void cv::Subdiv2D::setEdgePoints	(	int	edge,
		int	orgPt,
		int	dstPt
	)

protected

◆ splice()

void cv::Subdiv2D::splice	(	int	edgeA,
		int	edgeB
	)

protected

◆ swapEdges()

void cv::Subdiv2D::swapEdges ( int edge )

protected

◆ symEdge()

int cv::Subdiv2D::symEdge ( int edge ) const

Member Data Documentation

◆ bottomRight

Point2f cv::Subdiv2D::bottomRight

protected

Bottom right corner of the bounding rect.

◆ freePoint

int cv::Subdiv2D::freePoint

protected

◆ freeQEdge

int cv::Subdiv2D::freeQEdge

protected

◆ qedges

std::vector<QuadEdge> cv::Subdiv2D::qedges

protected

All of the edges.

◆ recentEdge

int cv::Subdiv2D::recentEdge

protected

◆ topLeft

Point2f cv::Subdiv2D::topLeft

protected

Top left corner of the bounding rect.

◆ validGeometry

bool cv::Subdiv2D::validGeometry

protected

◆ vtx

std::vector<Vertex> cv::Subdiv2D::vtx

protected

All of the vertices.

The documentation for this class was generated from the following file:

opencv2/imgproc.hpp

Classes

Public Types

Public Member Functions

Protected Member Functions

Protected Attributes

Member Enumeration Documentation

◆ anonymous enum

◆ anonymous enum

Constructor & Destructor Documentation

◆ Subdiv2D() [1/2]

◆ Subdiv2D() [2/2]

Member Function Documentation

◆ calcVoronoi()

◆ checkSubdiv()

◆ clearVoronoi()

◆ connectEdges()

◆ deleteEdge()

◆ deletePoint()

◆ edgeDst()

◆ edgeOrg()

◆ findNearest()

◆ getEdge()

◆ getEdgeList()

◆ getLeadingEdgeList()

◆ getTriangleList()

◆ getVertex()

◆ getVoronoiFacetList()

◆ initDelaunay()

◆ insert() [1/2]

◆ insert() [2/2]

◆ isRightOf()

◆ locate()

◆ newEdge()

◆ newPoint()

◆ nextEdge()

◆ rotateEdge()

◆ setEdgePoints()

◆ splice()

◆ swapEdges()

◆ symEdge()

Member Data Documentation

◆ bottomRight

◆ freePoint

◆ freeQEdge

◆ qedges

◆ recentEdge

◆ topLeft

◆ validGeometry

◆ vtx