Package org.opencv.imgproc

Class Subdiv2D

java.lang.Object

org.opencv.imgproc.Subdiv2D

public class Subdiv2D
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
protected final long	nativeObj
static final int	NEXT_AROUND_DST
static final int	NEXT_AROUND_LEFT
static final int	NEXT_AROUND_ORG
static final int	NEXT_AROUND_RIGHT
static final int	PREV_AROUND_DST
static final int	PREV_AROUND_LEFT
static final int	PREV_AROUND_ORG
static final int	PREV_AROUND_RIGHT
static final int	PTLOC_ERROR
static final int	PTLOC_INSIDE
static final int	PTLOC_ON_EDGE
static final int	PTLOC_OUTSIDE_RECT
static final int	PTLOC_VERTEX

Constructor Summary

Constructors

Modifier	Constructor	Description
	Subdiv2D()	creates an empty Subdiv2D object.
protected	Subdiv2D(long addr)
	Subdiv2D(Rect rect)

Method Summary

Modifier and Type	Method	Description
static Subdiv2D	__fromPtr__(long addr)
int	edgeDst(int edge)	Returns the edge destination.
int	edgeDst(int edge, Point dstpt)	Returns the edge destination.
int	edgeOrg(int edge)	Returns the edge origin.
int	edgeOrg(int edge, Point orgpt)	Returns the edge origin.
int	findNearest(Point pt)	Finds the subdivision vertex closest to the given point.
int	findNearest(Point pt, Point nearestPt)	Finds the subdivision vertex closest to the given point.
int	getEdge(int edge, int nextEdgeType)	Returns one of the edges related to the given edge.
void	getEdgeList(MatOfFloat4 edgeList)	Returns a list of all edges.
void	getLeadingEdgeList(MatOfInt leadingEdgeList)	Returns a list of the leading edge ID connected to each triangle.
long	getNativeObjAddr()
void	getTriangleList(MatOfFloat6 triangleList)	Returns a list of all triangles.
Point	getVertex(int vertex)	Returns vertex location from vertex ID.
Point	getVertex(int vertex, int[] firstEdge)	Returns vertex location from vertex ID.
void	getVoronoiFacetList(MatOfInt idx, List<MatOfPoint2f> facetList, MatOfPoint2f facetCenters)	Returns a list of all Voronoi facets.
void	initDelaunay(Rect rect)	Creates a new empty Delaunay subdivision
void	insert(MatOfPoint2f ptvec)	Insert multiple points into a Delaunay triangulation.
int	insert(Point pt)	Insert a single point into a Delaunay triangulation.
int	locate(Point pt, int[] edge, int[] vertex)	Returns the location of a point within a Delaunay triangulation.
int	nextEdge(int edge)	Returns next edge around the edge origin.
int	rotateEdge(int edge, int rotate)	Returns another edge of the same quad-edge.
int	symEdge(int edge)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

PTLOC_ERROR

public static final int PTLOC_ERROR

See Also:

• Constant Field Values

PTLOC_OUTSIDE_RECT

public static final int PTLOC_OUTSIDE_RECT

See Also:

• Constant Field Values

PTLOC_INSIDE

public static final int PTLOC_INSIDE

See Also:

• Constant Field Values

PTLOC_VERTEX

public static final int PTLOC_VERTEX

See Also:

• Constant Field Values

PTLOC_ON_EDGE

public static final int PTLOC_ON_EDGE

See Also:

• Constant Field Values

NEXT_AROUND_ORG

public static final int NEXT_AROUND_ORG

See Also:

• Constant Field Values

NEXT_AROUND_DST

public static final int NEXT_AROUND_DST

See Also:

• Constant Field Values

PREV_AROUND_ORG

public static final int PREV_AROUND_ORG

See Also:

• Constant Field Values

PREV_AROUND_DST

public static final int PREV_AROUND_DST

See Also:

• Constant Field Values

NEXT_AROUND_LEFT

public static final int NEXT_AROUND_LEFT

See Also:

• Constant Field Values

NEXT_AROUND_RIGHT

public static final int NEXT_AROUND_RIGHT

See Also:

• Constant Field Values

PREV_AROUND_LEFT

public static final int PREV_AROUND_LEFT

See Also:

• Constant Field Values

PREV_AROUND_RIGHT

public static final int PREV_AROUND_RIGHT

See Also:

• Constant Field Values

nativeObj

protected final long nativeObj

Constructor Details

Subdiv2D

protected Subdiv2D(long addr)

Subdiv2D

public Subdiv2D()

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

Subdiv2D

public Subdiv2D(Rect rect)

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.

Method Details

__fromPtr__

public static Subdiv2D __fromPtr__(long addr)

getNativeObjAddr

public long getNativeObjAddr()

initDelaunay

public void 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

public int insert(Point 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.

insert

public void insert(MatOfPoint2f 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.

locate

public int locate(Point 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.

findNearest

public int findNearest(Point pt,
 Point nearestPt)

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.

findNearest

public int findNearest(Point pt)

Finds the subdivision vertex closest to the given point.

Parameters:

pt - Input 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.

getEdgeList

public void getEdgeList(MatOfFloat4 edgeList)

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

public void getLeadingEdgeList(MatOfInt leadingEdgeList)

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

public void getTriangleList(MatOfFloat6 triangleList)

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].

getVoronoiFacetList

public void getVoronoiFacetList(MatOfInt idx,
 List<MatOfPoint2f> facetList,
 MatOfPoint2f 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.

getVertex

public Point getVertex(int vertex,
 int[] firstEdge)

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)

getVertex

public Point getVertex(int vertex)

Returns vertex location from vertex ID.

Parameters:

vertex - vertex ID.

Returns:

vertex (x,y)

getEdge

public int getEdge(int edge,
 int nextEdgeType)

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 )


Returns:

edge ID related to the input edge.

nextEdge

public int nextEdge(int edge)

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

public int rotateEdge(int edge,
 int rotate)

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.

symEdge

public int symEdge(int edge)

edgeOrg

public int edgeOrg(int edge,
 Point orgpt)

Returns the edge origin.

Parameters:

edge - Subdivision edge ID.

orgpt - Output vertex location.

Returns:

vertex ID.

edgeOrg

public int edgeOrg(int edge)

Returns the edge origin.

Parameters:

edge - Subdivision edge ID.

Returns:

vertex ID.

edgeDst

public int edgeDst(int edge,
 Point dstpt)

Returns the edge destination.

Parameters:

edge - Subdivision edge ID.

dstpt - Output vertex location.

Returns:

vertex ID.

edgeDst

public int edgeDst(int edge)

Returns the edge destination.

Parameters:

edge - Subdivision edge ID.

Returns:

vertex ID.