org.geotools.geometry.iso.topograph2D
Class Quadrant

java.lang.Object
  extended by org.geotools.geometry.iso.topograph2D.Quadrant

public class Quadrant
extends java.lang.Object

Utility functions for working with quadrants, which are numbered as follows:

  1 | 0
  --+--
  2 | 3
  <pre>


Constructor Summary
Quadrant()
           
 
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).
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Quadrant

public Quadrant()
Method Detail

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).


quadrant

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


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.



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