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JavaFX - 如何創(chuàng)建縮放動畫

我們想知道如何創(chuàng)建縮放動畫。 
import javafx.animation.ScaleTransition;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application {
    @Override
    public void start(Stage stage) {
        Group root = new Group();
        Scene scene = new Scene(root, 500, 200);
        stage.setScene(scene);

        Rectangle rect = new Rectangle (100, 40, 100, 100);
        rect.setArcHeight(50);
        rect.setArcWidth(50);
        rect.setFill(Color.VIOLET);
    
        ScaleTransition st = new ScaleTransition(Duration.millis(2000), rect);
        st.setByX(1.5f);
        st.setByY(1.5f);
        st.setAutoReverse(true);
    
        st.play();
        
        root.getChildren().add(rect);

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