Package 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 Details

    • deriveCenter

      @NotNull public static Observable<@Nullable Point> deriveCenter(@NotNull Observable<@Nullable 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<@Nullable Point> derivePointAtAngle(@NotNull Observable<@Nullable 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