GEOS
3.3.9
|
#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 |
Utility functions for working with quadrants, which are numbered as follows:
1 | 0 --+-- 2 | 3
static bool geos::geomgraph::Quadrant::isInHalfPlane | ( | int | quad, |
int | halfPlane | ||
) | [static] |
Returns whether the given quadrant lies within the given halfplane (specified by its right-hand quadrant).
static bool geos::geomgraph::Quadrant::isNorthern | ( | int | quad | ) | [static] |
Returns true if the given quadrant is 0 or 1.
static bool geos::geomgraph::Quadrant::isOpposite | ( | int | quad1, |
int | quad2 | ||
) | [static] |
Returns true if the quadrants are 1 and 3, or 2 and 4
static int geos::geomgraph::Quadrant::quadrant | ( | double | dx, |
double | dy | ||
) | [static] |
Returns the quadrant of a directed line segment (specified as x and y displacements, which cannot both be 0).
IllegalArgumentException | if the displacements are both 0 |
static int geos::geomgraph::Quadrant::quadrant | ( | const geom::Coordinate & | p0, |
const geom::Coordinate & | p1 | ||
) | [static] |
Returns the quadrant of a directed line segment from p0 to p1.
IllegalArgumentException | if the points are equal |