Using the Interpolator API

By default, Timeline calculates how property values change between KeyFrame objects using a linear function—changing property values proportionally to the time passed.

You can control that more precisely using the Interpolator API.

Predefined interpolators

You can set interpolators when creating KeyValue:

new KeyValue(node.translateYProperty(), 200, Interpolator.LINEAR);

The default interpolator is Interpolator.LINEAR.

Visually, it looks like an abrupt stop at the end of the animation. To soften that, you can use one of the easing interpolators:

• Interpolator.EASE_IN: Starts slowly
• Interpolator.EASE_OUT: Ends slowly
• Interpolator.EASE_BOTH: Starts and ends slowly

You can see them all at work simultaneously by running the following code:

    // chapter5/basics/InterpolatorsDemo.java
    public void start(Stage primaryStage) {
        VBox root = new VBox(10);
        Timeline timeline = new Timeline();
        timeline.setCycleCount(Timeline.INDEFINITE);
        timeline.setAutoReverse...