Method perform

src/main/java/fieldbox/boxes/TimeSlider.java:138–176

(Rect was, Rect now)

		off(off);
		on(on);
		skipForward(skipForward);
		skipBackward(skipBackward);

	}
*/
	protected void perform(Rect was, Rect now) {

		Map<Box, Double> previousMapping = LocalTime.Companion.growTimeFor(null, population().filter(x -> x.properties.get(frame).y>topLimit && x.properties.get(frame).y<bottomLimit).filter(x -> x.properties.get(frame).intersectsX(was.x)).collect(Collectors.toSet()), was.x);
		previousMapping.entrySet().removeIf(m -> !m.getKey().properties.get(frame).intersectsX(m.getValue()));
		Map<Box, Double> currentMapping = LocalTime.Companion.growTimeFor(null, population().filter(x -> x.properties.get(frame).y>topLimit && x.properties.get(frame).y<bottomLimit).filter(x -> x.properties.get(frame).intersectsX(now.x)).collect(Collectors.toSet()), now.x);
		currentMapping.entrySet().removeIf(m -> !m.getKey().properties.get(frame).intersectsX(m.getValue()));

		Set<Box> off = new LinkedHashSet<>(previousMapping.keySet());
		off.removeAll(currentMapping.keySet());
		Set<Box> on = new LinkedHashSet<>(currentMapping.keySet());
		on.removeAll(previousMapping.keySet());


//		Stream<Box> off = population().filter(x -> x.properties.get(frame).intersectsX(was.x))
//			.filter(x -> !x.properties.get(frame)
//				.intersectsX(now.x));
//		Stream<Box> on = population().filter(x -> !x.properties.get(frame).intersectsX(was.x))
//			.filter(x -> x.properties.get(frame)
//				.intersectsX(now.x));

		Set<Box> skipForward = new LinkedHashSet<>(currentMapping.keySet());
		skipForward.retainAll(previousMapping.keySet());
		skipForward.removeIf(x -> !x.properties.get(frame).inside(previousMapping.get(x).floatValue(), currentMapping.get(x).floatValue()));

//		Stream<Box> skipForward = population().filter(x -> x.properties.get(frame)
//			.inside(was.x, now.x));


//		Stream<Box> skipBackward = population().filter(x -> x.properties.get(frame).inside(now.x, was.x));
		this.currentMapping = currentMapping;
		this.currentMappingAtTime = now.x;

		off(off);
		on(on, currentMapping);
		skipForward(skipForward, currentMapping);
//		skipBackward(skipBackward);