com.luciad.geometries.observable

Class ObservableEllipseUtil

java.lang.Object

com.luciad.geometries.observable.ObservableEllipseUtil

public final class ObservableEllipseUtil
extends Object

This class provides utility methods for Observable instance for Ellipse.

Method Summary

Modifier and Type	Method and Description
static Observable<Point>	deriveCenter(Observable<Ellipse> observableEllipse) Derives an Observable Point from the given observable ellipse that represents the center point.
static Observable<Point>	derivePointAtAngle(Observable<Ellipse> observableEllipse, Angle angle) Derives an Observable Point from the given observable ellipse that represents the point at the given angle.

Methods inherited from class java.lang.Object

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

Method Detail

deriveCenter

@NotNull
public static Observable<Point> deriveCenter(@NotNull
                                                      Observable<Ellipse> observableEllipse)

Derives an Observable Point from the given observable ellipse that represents the center point.

This observable point will be updated when the given observable ellipse changes.

Notes:

• When the observable ellipse contains a null value, the observable center point instance will contain a null value too.
• Observable#setValue will throw an exception for derived instances.

Parameters:

observableEllipse - an observable ellipse from which to derive the center

Returns:

a derived Observable

derivePointAtAngle

@NotNull
public static Observable<Point> derivePointAtAngle(@NotNull
                                                            Observable<Ellipse> observableEllipse,
                                                            @NotNull
                                                            Angle angle)

Derives an Observable Point from the given observable ellipse that represents the point at the given angle.

This observable point will be updated when the given observable ellipse changes.

Notes:

• When the observable ellipse contains a null value, the observable point instance will contain a null value too.
• Observable#setValue will throw an exception for derived instances.

Parameters:

observableEllipse - an observable ellipse from which to derive the point

angle - the angle at which to derive the point. For example: an angle of 0 will result in the point on the right of the major axis. An angle of 90 will result in the point a the top of the minor axis.

Returns:

a derived Observable