Run the ClockAnimation Explain in your own words how the animation works. 1 impo

Question

Run the ClockAnimation Explain in your own words how the animation works. 1 import javafx.application.Application; 2 import javafx.stage.Stage; 3 import javafx.animation.KeyFrame; 4 import javafx.animation.Timeline; 5 import javafx.event.ActionEvent; 6 import javafx.event.EventHandler; 7 import javafx.scene.Scene; 8 import javafx.util.Duration; 9 10 public class ClockAnimation extends Application { 11 @Override//Override the start method in the Application class 12 public void start(Stage primaryStage) { 13 ClockPane clock = new ClockPane();//Create a clock create a clock 14 15//Create a handler for animation 16 EventHandler eventHandler = e - > { create a handler 17 clock.setCurrentTime();//Set a new clock time 18 }; 19 20//Create an animation for a running clock 21 Timeline animation = new Timeline(create a time line 22 new KeyFrame(Duration.millis(1000), eventHandler)); 23 animation.setCycleCount(Timeline.INDEFINITE); 24 animation.play();//Start animation 25 26//Create a scene and place it in the stage 27 Scene scene = new Scene(clock, 250, 50); 28 primaryStage.setTitle("ClockAnimation");//Set the stage title 29 primaryStage.setScene(scene);//Place the scene in the stage 30 primaryStage.show();//Display the stage 31 } 32 }

Explanation / Answer

public class ClockAnimation extends Application {

   @Override //override the start method in the application class

   public void start(Stage primaryStage) throws IOException {

       ClockPane clock = new ClockPane(); //create a clock

       EventHandler<ActionEvent> eventHandler = e -> {

           clock.setCurrentTime();

       };

       Timeline animation = new Timeline(new KeyFrame(Duration.millis(1000), eventHandler));

       animation.setCycleCount(Timeline.INDEFINITE);

       animation.play();

       Button cloc = new Button("clock");

       Button time = new Button("time");
  
//create hbox

       HBox hBox = new HBox(cloc, time);

       cloc.setOnAction(e -> primaryStage.set(new Scene(new BorderPane(clock, null, null, hBox, null),200,200)));

       time.setOnAction(e -> primaryStage.setScene(new Scene(new BorderPane(new DigitalClock(), null, null, hBox, null),200,200)));

       BorderPane borderPane = new BorderPane(clock, null, null, hBox, null);

       primaryStage.setScene(new Scene(borderPane,200,200));

       primaryStage.setTitle("ClockAnimation");

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

       launch(args);
   }
}
class ClockPane extends Pane {
   private int hour;
   private int minute;
   private int second;
   public ClockPane() {
       setCurrentTime();
   }
   public ClockPane(int hour, int minute, int second) {
       this.hour = hour;
       this.minute = minute;
       this.second = second;
   }
   public int getHour() {
       return hour;
   }
   public void setHour(int hour) {
       this.hour = hour;
       paintClock();
   }
   public int getMinute() {
       return minute;
   }
   public void setMinute(int minute) {
       this.minute = minute;
       paintClock();
   }
   public int getSecond() {
       return second;
   }
   public void setSecond(int second) {
       this.second = second;
       paintClock();
   }
   public void setCurrentTime() {
       Calendar calendar = new GregorianCalendar();
       this.hour = calendar.get(Calendar.HOUR_OF_DAY);
       this.minute = calendar.get(Calendar.MINUTE);
       this.second = calendar.get(Calendar.SECOND);
   paintClock();
   }
   private void paintClock() {
       double clockRadius = Math.min(getWidth(), getHeight()) * 0.8 * 0.5;
       double centerX = getWidth() / 2;
       double centerY = getHeight() / 2;
       Circle circle = new Circle(centerX, centerY, clockRadius);
       circle.setFill(Color.WHITE);
       circle.setStroke(Color.BLACK);
       Text t1 = new Text(centerX - 5, centerY - clockRadius + 12, "12");
       Text t2 = new Text(centerX - clockRadius + 3, centerY + 5, "9");
       Text t3 = new Text(centerX + clockRadius - 10, centerY + 3, "3");
       Text t4 = new Text(centerX - 3, centerY + clockRadius - 3, "6");
       double sLength = clockRadius * 0.8;
       double secondX = centerX + sLength * Math.sin(second * (2 * Math.PI / 60));
   double secondY = centerY - sLength * Math.cos(second * (2 * Math.PI / 60));
   Line sLine = new Line(centerX, centerY, secondX, secondY);
   sLine.setStroke(Color.RED);
   double mLength = clockRadius * 0.65;
   double xMinute = centerX + mLength * Math.sin(minute * (2 * Math.PI / 60));
   double minuteY = centerY - mLength * Math.cos(minute * (2 * Math.PI / 60));
   Line mLine = new Line(centerX, centerY, xMinute, minuteY);
   mLine.setStroke(Color.BLUE);
   double hLength = clockRadius * 0.5;
   double hourX = centerX + hLength * Math.sin((hour % 12 + minute / 60.0) * (2 * Math.PI / 12));
   double hourY = centerY - hLength * Math.cos((hour % 12 + minute / 60.0) * (2 * Math.PI / 12));
   Line hLine = new Line(centerX, centerY, hourX, hourY);
   hLine.setStroke(Color.GREEN);
   getChildren().clear();
   getChildren().addAll(circle, t1, t2, t3, t4, sLine, mLine, hLine);
   }
   @Override
   public void setWidth(double width) {
       super.setWidth(width);
       paintClock();
   }
   @Override
   public void setHeight(double height) {
       super.setHeight(height);
       paintClock();
   }
}
class DigitalClock extends Label {
   public DigitalClock() {
       bindToTime();
   }
   private void bindToTime() {
       Timeline timeline = new Timeline(
           new KeyFrame(Duration.seconds(0),
               new EventHandler<ActionEvent>() {
                       @Override
                       public void handle(ActionEvent actionEvent) {
                           Calendar time = Calendar.getInstance();
                           String hourString = StringUtilities.pad(2, ' ', time.get(Calendar.HOUR) == 0 ? "12" : time.get(Calendar.HOUR) + "");
                           String minuteString = StringUtilities.pad(2, '0', time.get(Calendar.MINUTE) + "");
                           String secondString = StringUtilities.pad(2, '0', time.get(Calendar.SECOND) + "");
                           String ampmString = time.get(Calendar.AM_PM) == Calendar.AM ? "AM" : "PM";
                           setText(hourString + ":" + minuteString + ":" + secondString + " " + ampmString);
                       }
               }
           ),
           new KeyFrame(Duration.seconds(1))
       );
       timeline.setCycleCount(Animation.INDEFINITE);
       timeline.play();
   }
}
class StringUtilities {
   public static String pad(int fieldWidth, char padChar, String s) {
       StringBuilder sb = new StringBuilder();
       for (int i = s.length(); i < fieldWidth; i++) {
           sb.append(padChar);
       }
       sb.append(s);
       return sb.toString();
   }
}

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