如何使用JavaFX过渡来制作平滑的弹跳动画？

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.animation.Transition;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
import javafx.util.Duration;

public class BouncingAnimation extends Application {

    private static final double CIRCLE_RADIUS = 50;
    private static final double CIRCLE_START_Y = 400;
    private static final double GRAVITY = 0.6;
    private static final double FRICTION = 0.9;

    @Override
    public void start(Stage primaryStage) {
        Circle circle = new Circle(CIRCLE_RADIUS, Color.BLUE);
        circle.setTranslateY(CIRCLE_START_Y);

        StackPane root = new StackPane(circle);
        Scene scene = new Scene(root, 800, 600);

        primaryStage.setScene(scene);
        primaryStage.show();

        // 创建弹跳动画对象
        Transition transition = new Transition() {
            {
                setCycleDuration(Duration.seconds(2));
            }

            @Override
            protected void interpolate(double frac) {
                // 计算当前时间点的位置
                double y = CIRCLE_START_Y - (frac * CIRCLE_START_Y);

                // 应用重力和摩擦力
                double velocity = 2 * GRAVITY * CIRCLE_START_Y * frac;
                velocity = velocity * FRICTION;
                y = y + velocity;

                // 更新圆的位置
                circle.setTranslateY(y);
            }
        };

        // 创建时间轴并添加关键帧
        Timeline timeline = new Timeline(
                new KeyFrame(Duration.ZERO, e -> transition.play()),
                new KeyFrame(Duration.seconds(2), e -> transition.stop())
        );

        // 播放动画
        timeline.play();
    }

    public static void main(String[] args) {
        launch(args);
    }
}