onKeyPressed function not working in JavaFX - animation

Question

I am trying to pause the PathTransition and restart it using the keyboard key P.
And also I am trying to increase and decrease the animation speed using UP/Down keys.
But when I run the code, these buttons dont seem to work. What am I doing wrong?
package exercise_15_29;
import javafx.animation.Animation;
import javafx.animation.PathTransition;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;
import javafx.scene.shape.Polygon;
import javafx.scene.input.KeyCode;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;
public class Exercise_15_29 extends Application {
Group car = new Group();
Circle wheel1 = new Circle(15,95,5);
Circle wheel2 = new Circle(35,95,5);
Polygon body1 = new Polygon();
Rectangle body2 = new Rectangle(0.0,80.0,50,10);
Line path = new Line(0,90,500,90);
int speed = 4000;
boolean play = true;
#Override
public void start(Stage primaryStage) {
body1.getPoints().addAll(new Double[]{
10.0, 80.0,
20.0, 70.0,
30.0, 70.0,
40.0, 80.0
});
body1.setFill(Color.BLUE);
body2.setFill(Color.SKYBLUE);
path.setVisible (false);
car.getChildren().addAll(wheel1,wheel2,body1,body2);
PathTransition pt = new PathTransition();
pt.setDuration(Duration.millis(speed));
pt.setPath(path);
pt.setNode(car);
pt.setCycleCount(Timeline.INDEFINITE);
pt.setAutoReverse(false);
pt.play();
Pane root = new Pane();
root.getChildren().add(car);
root.getChildren().add(path);
Scene scene = new Scene(root, 500, 100);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
root.setOnKeyTyped(e -> {
if(e.getCode() == KeyCode.P) {
if(play == true)
pt.stop();
else
pt.play();
play = !play;
}
});
root.setOnKeyPressed(e -> {
if(e.getCode() == KeyCode.UP)
pt.setDuration(Duration.millis(++speed));
else if(e.getCode() == KeyCode.DOWN)
pt.setDuration(Duration.millis(--speed));
});
}
public static void main(String[] args) {
launch(args);
}
}

Answer 1

this code works for me:
import javafx.animation.PathTransition;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;
import javafx.scene.shape.Polygon;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;
public class Exercise_15_29 extends Application {
Group car = new Group();
Circle wheel1 = new Circle(15, 95, 5);
Circle wheel2 = new Circle(35, 95, 5);
Polygon body1 = new Polygon();
Rectangle body2 = new Rectangle(0.0, 80.0, 50, 10);
Line path = new Line(0, 90, 500, 90);
int speed = 4000;
boolean play = true;
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage primaryStage) {
body1.getPoints().addAll(new Double[]{
10.0, 80.0,
20.0, 70.0,
30.0, 70.0,
40.0, 80.0
});
body1.setFill(Color.BLUE);
body2.setFill(Color.SKYBLUE);
path.setVisible(false);
car.getChildren().addAll(wheel1, wheel2, body1, body2);
PathTransition pt = new PathTransition();
pt.setDuration(Duration.millis(speed));
pt.setPath(path);
pt.setNode(car);
pt.setCycleCount(Timeline.INDEFINITE);
pt.setAutoReverse(false);
pt.play();
Pane root = new Pane();
root.getChildren().add(car);
root.getChildren().add(path);
Scene scene = new Scene(root, 500, 100);
scene.addEventFilter(KeyEvent.KEY_PRESSED, e -> {
System.out.println("P");
if (e.getCode() == KeyCode.P) {
if (play)
pt.stop();
else
pt.play();
play = !play;
}
});
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
// root.addEventFilter(KeyEvent.KEY_PRESSED, e -> {
// if (e.getCode() == KeyCode.P) {
// if (play == true)
// pt.stop();
// else
// pt.play();
// play = !play;
// }
// });
scene.setOnKeyPressed(e -> {
System.out.println("UP");
if (e.getCode() == KeyCode.UP)
pt.setDuration(Duration.millis(++speed));
else if (e.getCode() == KeyCode.DOWN)
pt.setDuration(Duration.millis(--speed));
});
// root.setOnKeyPressed(e -> {
// if(e.getCode() == KeyCode.UP)
// pt.setDuration(Duration.millis(++speed));
// else if(e.getCode() == KeyCode.DOWN)
// pt.setDuration(Duration.millis(--speed));
// });
}
}
I changed KeyTyped event to KEY_PRESSED (I recommend this), and also used scene.addEventFilter instead of root.setOnKeyPressed according to https://stackoverflow.com/a/24126049/3291867 and at last you can't change speed of car, you can't change Animation duration after or on playing it (as I know), you can use AnimationTimer for this.