如何使用scrollPane JavaFX显示大于屏幕的图像

ScrollPane scrollPane = new ScrollPane();

ImageView imageView = new ImageView("image.jpg");

scrollPane.setContent(imageView);

scrollPane.setHbarPolicy(ScrollPane.ScrollBarPolicy.AS_NEEDED); // 水平滚动条策略
scrollPane.setVbarPolicy(ScrollPane.ScrollBarPolicy.AS_NEEDED); // 垂直滚动条策略

Scene scene = new Scene(scrollPane, 800, 600);

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.image.ImageView;
import javafx.stage.Stage;

public class ScrollPaneExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        ScrollPane scrollPane = new ScrollPane();
        ImageView imageView = new ImageView("image.jpg");
        scrollPane.setContent(imageView);
        scrollPane.setHbarPolicy(ScrollPane.ScrollBarPolicy.AS_NEEDED);
        scrollPane.setVbarPolicy(ScrollPane.ScrollBarPolicy.AS_NEEDED);

        Scene scene = new Scene(scrollPane, 800, 600);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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