Package org.locationtech.jts.geomgraph
Class Quadrant
java.lang.Object
org.locationtech.jts.geomgraph.Quadrant
Utility functions for working with quadrants, which are numbered as follows:
1 | 0 --+-- 2 | 3
- Version:
- 1.7
-
Field Summary
Fields -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic 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 4static 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).static int
quadrant
(Coordinate p0, Coordinate p1) Returns the quadrant of a directed line segment from p0 to p1.
-
Field Details
-
NE
public static final int NE- See Also:
-
NW
public static final int NW- See Also:
-
SW
public static final int SW- See Also:
-
SE
public static final int SE- See Also:
-
-
Constructor Details
-
Quadrant
public Quadrant()
-
-
Method Details
-
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).- Throws:
IllegalArgumentException
- if the displacements are both 0
-
quadrant
Returns the quadrant of a directed line segment from p0 to p1.- Throws:
IllegalArgumentException
- if the points are equal
-
isOpposite
public static boolean isOpposite(int quad1, int quad2) Returns true if the quadrants are 1 and 3, or 2 and 4 -
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.
-