(Simulation: raise flag and play anthem) Write a program that displays a flag rising up, a...

(Simulation: raise flag and play anthem) Write a program that displays a flag rising up, as shown in Figure 1. As the national flag rises, play the national anthem. (You may use a flag image and anthem audio file from Listing 1.)

FIGURE 1 The animation simulates a flag rising.

LISTING 1 FlagAnthem.java

1 import javafx.application.Application;
2 import javafx.collections.FXCollections;
3 import javafx.collections.ObservableList;
4 import javafx.stage.Stage;
5 import javafx.geometry.Pos;
6 import javafx.scene.Scene;
7 import javafx.scene.control.Button;
8 import javafx.scene.control.ComboBox;
9 import javafx.scene.control.Label;
10 import javafx.scene.image.Image;
11 import javafx.scene.image.ImageView;
12 import javafx.scene.layout.BorderPane;
13 import javafx.scene.layout.HBox;
14 import javafx.scene.media.Media;
15 import javafx.scene.media.MediaPlayer;
16
17 public class FlagAnthem extends Application {
18 private final static int NUMBER_OF_NATIONS = 7;
19 private final static String URLBase =
20 "http://cs.armstrong.edu/liang/common";
21 private int currentIndex = 0;
22
23 @Override // Override the start method in the Application class
24 public void start(Stage primaryStage) {
25 Image[] images = new Image[NUMBER_OF_NATIONS];
26 MediaPlayer[] mp = new MediaPlayer[NUMBER_OF_NATIONS];
27
28 // Load images and audio
29 for (int i = 0; i
30 images[i] = new Image(URLBase + "/image/flag" + i + ".gif");
31 mp[i] = new MediaPlayer(new Media(
32 URLBase + "/audio/anthem/anthem" + i + ".mp3"));
33 }
34
35 Button btPlayPause = new Button(">");
36 btPlayPause.setOnAction(e -> {
37 if (btPlayPause.getText().equals(">")) {
38 btPlayPause.setText("||");
39 mp[currentIndex].pause();
40 } else {
41 btPlayPause.setText(">");
42 mp[currentIndex].play();
43 }
44 });
45
46 ImageView imageView = new ImageView(images[currentIndex]);
47 ComboBox cboNation = new ComboBox<>();
48 ObservableList items = FXCollections.observableArrayList
49 ("Denmark", "Germany", "China", "India", "Norway", "UK", "US");
50 cboNation.getItems().addAll(items);
51 cboNation.setValue(items.get(0));
52 cboNation.setOnAction(e -> {
53 mp[currentIndex].stop();
54 currentIndex = items.indexOf(cboNation.getValue());
55 imageView.setImage(images[currentIndex]);
56 mp[currentIndex].play();
57 });
58
59 HBox hBox = new HBox(10);
60 hBox.getChildren().addAll(btPlayPause,
61 new Label("Select a nation: "), cboNation);
62 hBox.setAlignment(Pos.CENTER);
63
64 // Create a pane to hold nodes
65 BorderPane pane = new BorderPane();
66 pane.setCenter(imageView);
67 pane.setBottom(hBox);
68
69 // Create a scene and place it in the stage
70 Scene scene = new Scene(pane, 350, 270);
71 primaryStage.setTitle("FlagAnthem"); // Set the stage title
72 primaryStage.setScene(scene); // Place the scene in the stage
73 primaryStage.show(); // Display the stage
74 }
75 }