public final class ObservablePolylineRingUtil extends Object
Observable
instance for PolylineRing
.Modifier and Type | Method and Description |
---|---|
static Observable<Point> |
derivePointAtIndex(Observable<PolylineRing> observablePolylineRing,
long index)
Derives an
Observable Point from the given observable polyline ring that represents the point at the given index. |
static Observable<Point> |
derivePointOnSegment(Observable<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. |
@NotNull public static Observable<Point> derivePointAtIndex(@NotNull Observable<PolylineRing> observablePolylineRing, long index)
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:
null
value, the observable point instance will contain a null
value too.
null
value.
Observable#setValue
will throw an exception for derived instances.
observablePolylineRing
- an observable polyline ring from which to derive the pointindex
- the point indexObservable
@NotNull public static Observable<Point> derivePointOnSegment(@NotNull Observable<PolylineRing> observablePolylineRing, long segmentIndex, double parameter)
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:
null
value, the observable point instance will contain a null
value too.
null
value.
Observable#setValue
will throw an exception for derived instances.
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 segmentObservable