JavaFX 动画不起作用

Question

我正在尝试制作一个对象在屏幕上移动的应用程序，仅更改其 x 值。我没有收到任何错误，但是当我运行它时它不起作用。对象正在显示，但矩形没有动画。我不知道该怎么办

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application {

    private BorderPane root;
    private Stage stage;
    private Scene scene;
    private AnchorPane anchorPane;
    private Rectangle player;
    private Circle circles;
    private Button up, down;
    private Timeline timer;

    @Override
    public void start(Stage primaryStage) {
        stage = primaryStage;
        root = new BorderPane();
        scene = new Scene(root, 600, 500); //width and height of application
        stage.setScene(scene);
        stage.setTitle("Hoop runner");  //text for the title bar of the window

        scene.getStylesheets().add("hoop.css");

        anchorPane = new AnchorPane();
        anchorPane.setMaxHeight(500);
        anchorPane.setMinHeight(500);
        anchorPane.setMinWidth(600);
        anchorPane.setMaxWidth(600);
        player = new Rectangle();
        circles = new Circle();
        up = new Button("˄");
        down = new Button("˅");


        root.setCenter(new VBox(new VBox(circles),
                new HBox(player)));

        root.setCenter(anchorPane);

        player.setX(5);
        player.setY(380);
        player.setHeight(80);
        player.setWidth(120);
        anchorPane.getChildren().add(player);

        timer = new Timeline(Animation.INDEFINITE);

        timer.setCycleCount(Animation.INDEFINITE);

        timer.getKeyFrames().add(new KeyFrame(Duration.INDEFINITE, event -> maverick()));


        timer.play();







        stage.show();




    }

    private void  maverick() {




            timer.play();
            System.out.println("hi");
            player.setX(player.getX() + 2);
            timer.play();

    }


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

Answer 1

• 如果要定位节点或为其设置动画，请使用 setTranslateX 而不是 setX。
• 将timer = new Timeline(Animation.INDEFINITE) 更改为timer = new Timeline()。
• 将new KeyFrame(Duration.INDEFINITE, event -> maverick()) 更改为new KeyFrame(Duration.millis(500), event -> maverick())（例如）。

关键帧必须有一个时间点。如果像示例一样，您使用 500 毫秒，那么 KeyFrame 的 EventHandler 将在 500 毫秒后被调用。由于您的 TimeLine 的 cycleCount 为 INDEFINITE，因此它将每 500 毫秒循环并执行一次 KeyFrame。