Javafx我想加个背景

可以在Pane中添加一个Background来设置背景，具体操作如下：

1. 定义一个背景：

BackgroundFill backgroundFill = new BackgroundFill(Color.LIGHTBLUE, CornerRadii.EMPTY, Insets.EMPTY);
Background background = new Background(backgroundFill);

这里定义的背景是浅蓝色的。

2. 在Pane中设置背景：

Pane rootNode = new Pane();
rootNode.setBackground(background);

将上面定义好的背景设置给Pane即可。

完整代码如下：

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.PathTransition;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Ellipse;
import javafx.stage.Stage;
import javafx.util.Duration;

public class FXTest6 extends Application {

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        // 定义背景
        BackgroundFill backgroundFill = new BackgroundFill(Color.LIGHTBLUE, CornerRadii.EMPTY, Insets.EMPTY);
        Background background = new Background(backgroundFill);

        Image image = new Image(getClass().getResourceAsStream("previewFix.jpg"), 600, 400, true, true);
        ImageView iv = new ImageView();
        Pane rootNode = new Pane();

        Ellipse ellipse = new Ellipse(300, 200, 100, 50);
        ellipse.setFill(Color.WHITE);
        ellipse.setStroke(Color.BLACK);

        Circle circle = new Circle(250, 200, 20);
        circle.setFill(Color.BLACK);

        PathTransition pt = new PathTransition(Duration.millis(4500), ellipse, circle);
        pt.play();

        Timeline timeline = new Timeline();
        timeline.setCycleCount(Animation.INDEFINITE);
        timeline.setAutoReverse(true);
        KeyValue keyValue = new KeyValue(circle.rotateProperty(), 360);
        KeyFrame keyFrame = new KeyFrame(Duration.seconds(2), keyValue);
        timeline.getKeyFrames().add(keyFrame);
        timeline.play();

        rootNode.getChildren().addAll(ellipse, circle, iv);
        rootNode.setBackground(background);

        Scene scene = new Scene(rootNode, 600, 400);
        primaryStage.setTitle("移动动画");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

运行后，应该就能看到带有背景的动画界面了。