The Cell class stores information about the spatial extent of a Grid cell and any cases where a line crosses that cell (recorded in a Traversal). More...

#include <Cell.h>

Public Member Functions
	Cell (double xmin, double ymin, double xmax, double ymax)

	Cell (const geom::Envelope &b)

void	getEdgePoints (Side s, std::vector< geom::CoordinateXY > &points) const
	Get all points that fall on the specified side of this cell.

const geom::Envelope &	box () const

double	getWidth () const

double	getHeight () const

double	getArea () const

void	forceExit ()

bool	isDetermined () const

double	getTraversalLength () const
	Return the total length of a linear geometry within this Cell.

double	getCoveredFraction () const
	Return the fraction of this Cell that is covered by a polygon.

std::unique_ptr< geom::Geometry >	getCoveredPolygons (const geom::GeometryFactory &) const

Traversal &	getLastTraversal ()

bool	take (const geom::CoordinateXY &c, const geom::CoordinateXY prev_original, bool exitOnBoundary, const void parentage)

Detailed Description

The Cell class stores information about the spatial extent of a Grid cell and any cases where a line crosses that cell (recorded in a Traversal).

Member Function Documentation

◆ forceExit()

void geos::operation::grid::Cell::forceExit ( )

Force the last Coordinate processed (via take) to be considered as an exit point, provided that it lies on the boundary of this Cell.

◆ getCoveredPolygons()

std::unique_ptr< geom::Geometry > geos::operation::grid::Cell::getCoveredPolygons ( const geom::GeometryFactory & ) const

Return a newly constructed geometry representing the portion of this Cell that is covered by a polygon

◆ getLastTraversal()

Traversal & geos::operation::grid::Cell::getLastTraversal ( )

Return the last (most recent) traversal to which a coordinate has been added. The traversal may or may not be completed.

◆ isDetermined()

bool geos::operation::grid::Cell::isDetermined ( ) const

Returns whether the cell can be determined to be wholly or partially covered by a polygon.

◆ take()

bool geos::operation::grid::Cell::take	(	const geom::CoordinateXY &	c,
		const geom::CoordinateXY *	prev_original,
		bool	exitOnBoundary,
		const void *	parentage
	)

Attempt to take a coordinate and add it to a Traversal in progress, or start a new Traversal

Parameters

c	Coordinate to process
prev_original	The last uninterpolated coordinate preceding `c` in the boundary being processed
exitOnBoundary	Whether to exit the cell if `c` lies on the boundary. This is needed to ensure that exit nodes are added to both polygons whose shared boundary is coincident with the Cell boundary. If these nodes are not needed (for example, in the area-only case), it is more efficient to not exit the cell.
parentage	an optional pointer indicating the source of the coordinate.

Returns: true if the Coordinate was inside this cell, false otherwise

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

Cell.h