Package org.meteoinfo.jts.algorithm

Class HCoordinate

java.lang.Object

org.meteoinfo.jts.algorithm.HCoordinate

public class HCoordinate
extends java.lang.Object

Represents a homogeneous coordinate in a 2-D coordinate space. In JTS HCoordinates are used as a clean way of computing intersections between line segments.

Field Summary

Fields

Modifier and Type	Field	Description
double	w
double	x
double	y

Constructor Summary

Constructors

Constructor	Description
HCoordinate()
HCoordinate(double _x, double _y)
HCoordinate(double _x, double _y, double _w)
HCoordinate(HCoordinate p1, HCoordinate p2)
HCoordinate(Coordinate p)
HCoordinate(Coordinate p1, Coordinate p2)	Constructs a homogeneous coordinate which is the intersection of the lines define by the homogenous coordinates represented by two Coordinates.
HCoordinate(Coordinate p1, Coordinate p2, Coordinate q1, Coordinate q2)

Method Summary

Modifier and Type	Method	Description
Coordinate	getCoordinate()
double	getX()
double	getY()
static Coordinate	intersection(Coordinate p1, Coordinate p2, Coordinate q1, Coordinate q2)	Computes the (approximate) intersection point between two line segments using homogeneous coordinates.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

x

public double x

y

public double y

w

public double w

Constructor Detail

HCoordinate

public HCoordinate()

HCoordinate

public HCoordinate(double _x,
                   double _y,
                   double _w)

HCoordinate

public HCoordinate(double _x,
                   double _y)

HCoordinate

public HCoordinate(Coordinate p)

HCoordinate

public HCoordinate(HCoordinate p1,
                   HCoordinate p2)

HCoordinate

public HCoordinate(Coordinate p1,
                   Coordinate p2)

Constructs a homogeneous coordinate which is the intersection of the lines define by the homogenous coordinates represented by two Coordinates.

Parameters:

p1 -

p2 -

HCoordinate

public HCoordinate(Coordinate p1,
                   Coordinate p2,
                   Coordinate q1,
                   Coordinate q2)

Method Detail

intersection

public static Coordinate intersection(Coordinate p1,
                                      Coordinate p2,
                                      Coordinate q1,
                                      Coordinate q2)
                               throws NotRepresentableException

Computes the (approximate) intersection point between two line segments using homogeneous coordinates.

Note that this algorithm is not numerically stable; i.e. it can produce intersection points which lie outside the envelope of the line segments themselves. In order to increase the precision of the calculation input points should be normalized before passing them to this routine.

Throws:

NotRepresentableException

getX

public double getX()
            throws NotRepresentableException

Throws:

NotRepresentableException

getY

public double getY()
            throws NotRepresentableException

Throws:

NotRepresentableException

getCoordinate

public Coordinate getCoordinate()
                         throws NotRepresentableException

Throws:

NotRepresentableException