public CollidingGameObject() {
		super();

		scaleWidth.addListener(new ChangeListener<Number>() {
			@Override
			public void changed(ObservableValue<? extends Number> attribute, Number oldValue, Number newValue) {
				onWidthChanged(newValue.doubleValue());
			}
		});

		scaleHeight.addListener(new ChangeListener<Number>() {
			@Override
			public void changed(ObservableValue<? extends Number> attribute, Number oldValue, Number newValue) {
				onHeightChanged(newValue.doubleValue());
			}
		});
	}