Package com.luciad.geometries.observable
Class ObservablePolylineRingUtil
java.lang.Object
com.luciad.geometries.observable.ObservablePolylineRingUtil
This class provides utility methods for
Observable
instance for PolylineRing
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Method Summary
Modifier and TypeMethodDescriptionstatic Observable
<@Nullable Point> derivePointAtIndex
(Observable<@Nullable PolylineRing> observablePolylineRing, long index) Derives anObservable
Point
from the given observable polyline ring that represents the point at the given index.static Observable
<@Nullable Point> derivePointOnSegment
(Observable<@Nullable PolylineRing> observablePolylineRing, long segmentIndex, double parameter) Derives anObservable
Point
from the given observable polyline ring that represents a point on a segment of the polyline ring.
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Method Details
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derivePointAtIndex
@NotNull public static Observable<@Nullable Point> derivePointAtIndex(@NotNull Observable<@Nullable PolylineRing> observablePolylineRing, long index) Derives anObservable
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 anull
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 pointindex
- the point index- Returns:
- a derived
Observable
- When the observable polyline ring contains a
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derivePointOnSegment
@NotNull public static Observable<@Nullable Point> derivePointOnSegment(@NotNull Observable<@Nullable PolylineRing> observablePolylineRing, long segmentIndex, double parameter) Derives anObservable
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 anull
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 pointsegmentIndex
- 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
- When the observable polyline ring contains a
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