gov.nasa.worldwind.geom

Class Ellipsoid

java.lang.Object

gov.nasa.worldwind.geom.Ellipsoid

public class Ellipsoid
extends java.lang.Object

Oblate ellipsoid with semi-major axis and inverse flattening.

Constructor Summary

Constructors

Constructor and Description
Ellipsoid() Constructs an ellipsoid with semi-major axis and inverse flattening both 1.0.
Ellipsoid(double semiMajorAxis, double inverseFlattening) Constructs an ellipsoid with a specified semi-major axis and inverse flattening.
Ellipsoid(Ellipsoid ellipsoid) Constructs an ellipsoid with the semi-major axis and inverse flattening of a specified ellipsoid.

Method Summary

Modifier and Type	Method and Description
double	eccentricitySquared() Computes this ellipsoid's eccentricity squared.
boolean	equals(java.lang.Object o)
int	hashCode()
double	inverseFlattening() Computes this ellipsoid's inverse flattening, a measure of an ellipsoid's compression.
double	semiMajorAxis() Computes this ellipsoid's semi-major axis length in meters.
double	semiMinorAxis() Computes this ellipsoid's semi-minor length axis in meters.
Ellipsoid	set(double semiMajorAxis, double inverseFlattening) Sets this ellipsoid to a specified semi-major axis and inverse flattening.
Ellipsoid	set(Ellipsoid ellipsoid) Sets this ellipsoid to the semi-major axis and inverse flattening of a specified ellipsoid.
java.lang.String	toString()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Ellipsoid

public Ellipsoid()

Constructs an ellipsoid with semi-major axis and inverse flattening both 1.0.

Ellipsoid

public Ellipsoid(double semiMajorAxis,
                 double inverseFlattening)

Constructs an ellipsoid with a specified semi-major axis and inverse flattening.

Parameters:

semiMajorAxis - one half of the ellipsoid's major axis length in meters, which runs through the center to opposite points on the equator

inverseFlattening - measure of the ellipsoid's compression, indicating how much the semi-minor axis is compressed relative to the semi-major axis

Ellipsoid

public Ellipsoid(Ellipsoid ellipsoid)

Constructs an ellipsoid with the semi-major axis and inverse flattening of a specified ellipsoid.

Parameters:

ellipsoid - the ellipsoid specifying the values

Throws:

java.lang.IllegalArgumentException - If the ellipsoid is null

Method Detail

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

set

public Ellipsoid set(double semiMajorAxis,
                     double inverseFlattening)

Sets this ellipsoid to a specified semi-major axis and inverse flattening.

Parameters:

semiMajorAxis - the new semi-major axis length in meters, one half of the ellipsoid's major axis, which runs through the center to opposite points on the equator

inverseFlattening - the new inverse flattening, a measure of the ellipsoid's compression, indicating how much the semi-minor axis is compressed relative to the semi-major axis

Returns:

this ellipsoid with its semi-major axis and inverse flattening set to the specified values

set

public Ellipsoid set(Ellipsoid ellipsoid)

Sets this ellipsoid to the semi-major axis and inverse flattening of a specified ellipsoid.

Parameters:

ellipsoid - the ellipsoid specifying the new values

Returns:

this ellipsoid with its semi-major axis and inverse flattening set to that of the specified ellipsoid

Throws:

java.lang.IllegalArgumentException - If the ellipsoid is null

semiMajorAxis

public double semiMajorAxis()

Computes this ellipsoid's semi-major axis length in meters. The semi-major axis is one half of the ellipsoid's major axis, which runs through the center to opposite points on the equator.

Returns:

this ellipsoid's semi-major axis length in meters

semiMinorAxis

public double semiMinorAxis()

Computes this ellipsoid's semi-minor length axis in meters. The semi-minor axis is one half of the ellipsoid's minor axis, which runs through the center to opposite points on the poles.

Returns:

this ellipsoid's semi-minor axis length in meters

inverseFlattening

public double inverseFlattening()

Computes this ellipsoid's inverse flattening, a measure of an ellipsoid's compression. The returned value is equivalent to a / (a - b), where a and b indicate this ellipsoid's semi-major axis and semi-minor axis, respectively.

Returns:

this ellipsoid's inverse flattening

eccentricitySquared

public double eccentricitySquared()

Computes this ellipsoid's eccentricity squared. The returned value is equivalent to 2*f - f*f, where f is this ellipsoid's flattening.

Returns:

this ellipsoid's eccentricity squared