GEOM_FADE2D::Voronoi2 Class Reference

Voronoi diagram. More...

#include <Voronoi2.h>

Public Member Functions
bool	getVCellsAtVEdge (VoroVertex2 *pVoroVtx0, VoroVertex2 *pVoroVtx1, VoroCell2 *&pCell0, VoroCell2 *&pCell1)
	Get the Voronoi cells adjacent to a Voronoi edge. More...
VoroCell2 *	getVoronoiCell (Point2 *pSite)
	Get Voronoi cell. More...
void	getVoronoiCells (std::vector< VoroCell2 * > &vVoronoiCells)
	Get all Voronoi cells. More...
VoroVertex2 *	getVoronoiVertex (Triangle2 *pT)
	Get the Voronoi vertex of a triangle. More...
bool	isValid () const
	Is valid. More...
VoroCell2 *	locateVoronoiCell (const Point2 &queryPoint)
	Locate a Voronoi Cell. More...
void	show (const char *filename, bool bVoronoi=true, bool bCellColors=true, bool bSites=true, bool bDelaunay=true, bool bCellLabels=false)
	Draw the Voronoi diagram. More...
void	show (Visualizer2 *pVisualizer, bool bVoronoi=true, bool bCellColors=true, bool bSites=true, bool bDelaunay=true, bool bCellLabels=false)
	Draw the Voronoi diagram. More...

Protected Attributes
Voronoi2Impl *	pImpl

Detailed Description

This class represents a Voronoi diagram. A Voronoi diagram is the dual graph of a Delaunay triangulation i.e.,

• Each Voronoi cell contains the area closest to its site which is a Delaunay vertex
• Each Voronoi edge has a dual edge in the Delaunay triangulation at an angle of 90 degrees to it.
• Each Voronoi vertex is the circumcenter of a Delaunay triangle

See also

https://en.wikipedia.org/wiki/Voronoi_diagram

Member Function Documentation

getVCellsAtVEdge()

bool GEOM_FADE2D::Voronoi2::getVCellsAtVEdge	(	VoroVertex2 *	pVoroVtx0,
		VoroVertex2 *	pVoroVtx1,
		VoroCell2 *&	pCell0,
		VoroCell2 *&	pCell1
	)

Parameters

pVoroVtx0,pVoroVtx1	are the Voronoi vertices that define the Voronoi edge
pCell0,pCell1	are used to return the adjacent Voronoi cells or NULL if the command fails.

Returns

true when the command succeeds or false otherwise i.e., when (pVoroVtx0,pVoroVtx1) is not an edge of the Voronoi diagram.

getVoronoiCell()

VoroCell2* GEOM_FADE2D::Voronoi2::getVoronoiCell

(

Point2 *

pSite

)

Use this method to retrieve the Voronoi cell of a specific site.

Parameters

[in]

pSite

Returns

the VoroCell2 of pSite.

getVoronoiCells()

void GEOM_FADE2D::Voronoi2::getVoronoiCells

(

std::vector< VoroCell2 * > &

vVoronoiCells

)

Use this method to retrieve all finite and infinite Voronoi cells.

Parameters

[out]

vVoronoiCells

getVoronoiVertex()

VoroVertex2* GEOM_FADE2D::Voronoi2::getVoronoiVertex

(

Triangle2 *

pT

)

Get the Voronoi vertex of a certain dual Delaunay triangle pT

Parameters

[in]

pT

Returns

the Voronoi vertex that corresponds to pT

isValid()

bool GEOM_FADE2D::Voronoi2::isValid

(

)

const

Returns

whether the Voronoi diagram is ready for use. This is the case as soon 3 sites exist which are not collinear.

locateVoronoiCell()

VoroCell2* GEOM_FADE2D::Voronoi2::locateVoronoiCell

(

const Point2 &

queryPoint

)

This is a high performance method to locate the Voronoi cell of an arbitrary queryPoint

Parameters

[in]

queryPoint

Returns

the Voronoi cell that contains queryPoint or NULL if the Voronoi diagram is invalid.

show() [1/2]

void GEOM_FADE2D::Voronoi2::show	(	const char *	filename,
		bool	bVoronoi = true,
		bool	bCellColors = true,
		bool	bSites = true,
		bool	bDelaunay = true,
		bool	bCellLabels = false
	)

Parameters

filename	is the output *.ps filename
bVoronoi	draw the edges of the Voronoi diagram (default: true)
bCellColors	use background colors for the Voronoi cells (default: true)
bSites	draw the sites (default: true)
bDelaunay	draw the Delaunay triangles (default: true)
bCellLabels	show cell labels (or -1 if not assigned) (default: false)

This method does automatically crop the viewport to twice the range of the sites. Thus very large and infinite cells appear clipped.

show() [2/2]

void GEOM_FADE2D::Voronoi2::show	(	Visualizer2 *	pVisualizer,
		bool	bVoronoi = true,
		bool	bCellColors = true,
		bool	bSites = true,
		bool	bDelaunay = true,
		bool	bCellLabels = false
	)

Parameters

pVisualizer	is the Visualizer2 object to be used
bVoronoi	draw the edges of the Voronoi diagram (default: true)
bCellColors	use background colors for the Voronoi cells (default: true)
bSites	draw the sites (default: true)
bDelaunay	draw the Delaunay triangles (default: true)
bCellLabels	show cell labels (or -1 if not assigned) (default: false)

Note

This method only clips infinite cells. But finite cells can also be very large. Call Visualizer2::setLimit() to specify the range of interest.

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

• Voronoi2.h