tweenRect
fun tweenRect(easing: EasingFunction, duration: Measure<Time>, delay: Measure<Time> = zeroMillis): FiniteNumericAnimationPlan<Rectangle, Array<Double>>(source)
fun tweenRect(easings: (dimension: Int) -> Easing, delay: Measure<Time> = zeroMillis): FiniteNumericAnimationPlan<Rectangle, Array<Double>>(source)