com.vividsolutions.jts.geomgraph

Class Quadrant


public class Quadrant
extends java.lang.Object

Utility functions for working with quadrants, which are numbered as follows:
 1 | 0
 --+--
 2 | 3
 
Version:
1.7

Method Summary

static int
commonHalfPlane(int quad1, int quad2)
Returns the right-hand quadrant of the halfplane defined by the two quadrants, or -1 if the quadrants are opposite, or the quadrant if they are identical.
static boolean
isInHalfPlane(int quad, int halfPlane)
Returns whether the given quadrant lies within the given halfplane (specified by its right-hand quadrant).
static boolean
isNorthern(int quad)
Returns true if the given quadrant is 0 or 1.
static boolean
isOpposite(int quad1, int quad2)
Returns true if the quadrants are 1 and 3, or 2 and 4
static int
quadrant(Coordinate p0, Coordinate p1)
Returns the quadrant of a directed line segment from p0 to p1.
static int
quadrant(double dx, double dy)
Returns the quadrant of a directed line segment (specified as x and y displacements, which cannot both be 0).

Method Details

commonHalfPlane

public static int commonHalfPlane(int quad1,
                                  int quad2)
Returns the right-hand quadrant of the halfplane defined by the two quadrants, or -1 if the quadrants are opposite, or the quadrant if they are identical.

isInHalfPlane

public static boolean isInHalfPlane(int quad,
                                    int halfPlane)
Returns whether the given quadrant lies within the given halfplane (specified by its right-hand quadrant).

isNorthern

public static boolean isNorthern(int quad)
Returns true if the given quadrant is 0 or 1.

isOpposite

public static boolean isOpposite(int quad1,
                                 int quad2)
Returns true if the quadrants are 1 and 3, or 2 and 4

quadrant

public static int quadrant(Coordinate p0,
                           Coordinate p1)
Returns the quadrant of a directed line segment from p0 to p1.

quadrant

public static int quadrant(double dx,
                           double dy)
Returns the quadrant of a directed line segment (specified as x and y displacements, which cannot both be 0).