geos::geom::Quadrant Class Reference

Utility functions for working with quadrants. More...

#include <Quadrant.h>

Static Public Member Functions
static int	quadrant (double dx, double dy)
static int	quadrant (const geom::Coordinate &p0, const geom::Coordinate &p1)
static bool	isOpposite (int quad1, int quad2)
static int	commonHalfPlane (int quad1, int quad2)
static bool	isInHalfPlane (int quad, int halfPlane)
static bool	isNorthern (int quad)

Static Public Attributes
static const int	NE = 0
static const int	NW = 1
static const int	SW = 2
static const int	SE = 3

Detailed Description

Utility functions for working with quadrants.

The quadrants are numbered as follows:

1 | 0
--+--
2 | 3

Member Function Documentation

isInHalfPlane()

static bool geos::geom::Quadrant::isInHalfPlane ( int  quad, int  halfPlane  )

static

Returns whether the given quadrant lies within the given halfplane (specified by its right-hand quadrant).

isNorthern()

static bool geos::geom::Quadrant::isNorthern ( int  quad )

inlinestatic

Returns true if the given quadrant is 0 or 1.

isOpposite()

static bool geos::geom::Quadrant::isOpposite ( int  quad1, int  quad2  )

inlinestatic

Returns true if the quadrants are 1 and 3, or 2 and 4

quadrant() [1/2]

static int geos::geom::Quadrant::quadrant ( const geom::Coordinate &  p0, const geom::Coordinate &  p1  )

inlinestatic

Returns the quadrant of a directed line segment from p0 to p1.

Exceptions

IllegalArgumentException

if the points are equal

References geos::geom::Coordinate::toString(), geos::geom::Coordinate::x, and geos::geom::Coordinate::y.

quadrant() [2/2]

static int geos::geom::Quadrant::quadrant ( double  dx, double  dy  )

inlinestatic

Returns the quadrant of a directed line segment (specified as x and y displacements, which cannot both be 0).

Exceptions

IllegalArgumentException

if the displacements are both 0

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

• Quadrant.h