com.revolsys.jts.algorithm

Class HCoordinate

java.lang.Object

com.revolsys.jts.algorithm.HCoordinate

public class HCoordinate
extends 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.

Version:

1.7

Author:

David Skea

Field Summary

Fields

Modifier and Type	Field and Description
double	w
double	x
double	y

Constructor Summary

Constructors

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

Method Summary

Methods

Modifier and Type	Method and Description
Point	getCoordinate()
double	getX()
double	getY()
static Point	intersection(Point p1, Point p2, Point q1, Point 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)

HCoordinate

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

HCoordinate

public HCoordinate(HCoordinate p1,
           HCoordinate p2)

HCoordinate

public HCoordinate(Point p)

HCoordinate

public HCoordinate(Point p1,
           Point p2)

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

Parameters:

p1 -

p2 -

HCoordinate

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

Method Detail

intersection

public static Point intersection(Point p1,
                 Point p2,
                 Point q1,
                 Point 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

getCoordinate

public Point getCoordinate()
                    throws NotRepresentableException

Throws:

NotRepresentableException

getX

public double getX()
            throws NotRepresentableException

Throws:

NotRepresentableException

getY

public double getY()
            throws NotRepresentableException

Throws:

NotRepresentableException