public static EventStream < Long > animationFrames ( ) { return animationTicks ( ) . accumulate ( t ( 0L , - 1L ) , ( state , now ) -> state . map ( ( d , last ) -> { return t ( last == - 1L ? 0L : now - last , now ) ; } ) ) . map ( t -> t . _1 ) ; }
Returns a stream that on each animation frame emits the duration elapsed since the previous animation frame in nanoseconds .