Class ObservablePolylineRingUtil

java.lang.Object
com.luciad.geometries.observable.ObservablePolylineRingUtil

public final class ObservablePolylineRingUtil extends Object
This class provides utility methods for Observable instance for PolylineRing.
  • Method Details Link icon

    • derivePointAtIndex Link icon

      @NotNull public static Observable<@Nullable Point> derivePointAtIndex(@NotNull Observable<@Nullable PolylineRing> observablePolylineRing, long index)
      Derives an Observable Point from the given observable polyline ring that represents the point at the given index.

      This observable point will be updated when the given observable polyline ring changes.

      Notes:

      • When the observable polyline ring contains a null value, the observable point instance will contain a null value too.
      • When the given index >= point count, the observable point instance will contain a null value.
      • Observable#setValue will throw an exception for derived instances.
      Parameters:
      observablePolylineRing - an observable polyline ring from which to derive the point
      index - the point index
      Returns:
      a derived Observable
    • derivePointOnSegment Link icon

      @NotNull public static Observable<@Nullable Point> derivePointOnSegment(@NotNull Observable<@Nullable PolylineRing> observablePolylineRing, long segmentIndex, double parameter)
      Derives an Observable Point from the given observable polyline ring that represents a point on a segment of the polyline ring.

      This observable point will be updated when the given observable polyline ring changes.

      Notes:

      • When the observable polyline ring contains a null value, the observable point instance will contain a null value too.
      • When the given segmentIndex >= point count, the observable point instance will contain a null value.
      • Observable#setValue will throw an exception for derived instances.
      Parameters:
      observablePolylineRing - an observable polyline ring from which to derive the point
      segmentIndex - a segment index: a value between [0, pointCount - 2]. For example: segment index 0 corresponds with the segment between the points with index 0 and 1.
      parameter - a parameter value between [0, 1] that determines which point of the segment is chosen. This can for example be 0.5, to get the middle of the segment
      Returns:
      a derived Observable