why does while() loop not work on pathTransition? - javafx

Question

I've been trying to make my pathTransition loop but it doesn't work. I have already tried with a while loop but nothing happens. "boom" runs the path once and then stops. I would like the "boom" to choose a new path each time.
int i = 1;
while(i < 5){
Path path = new Path();
double x = (new Random().ints(-100,400 + 1).iterator().next());
path.getElements().add (new MoveTo (x, -190));
path.getElements().add (new LineTo(x, 300));
PathTransition pathTransition = new PathTransition();
pathTransition.setDuration(Duration.millis(10000));
pathTransition.setNode(boom);
pathTransition.setPath(path);
pathTransition.setOrientation(OrientationType.NONE);
pathTransition.setAutoReverse(false);
pathTransition.play();
i++;

Answer 1

You want to add all your PathTransitions to a SequentialTransition like this:
import java.util.Random;
import javafx.animation.PathTransition;
import javafx.animation.SequentialTransition;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.LineTo;
import javafx.scene.shape.MoveTo;
import javafx.scene.shape.Path;
import javafx.stage.Stage;
import javafx.util.Duration;
public class PathLoop extends Application {
Node boom;
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage primaryStage) throws Exception {
Button goButton = new Button("Go");
goButton.setOnAction(this::doAnimation);
boom = new Circle(20, Color.RED);
AnchorPane playfield = new AnchorPane(boom);
playfield.setPrefSize(600, 600);
AnchorPane.setLeftAnchor(boom, 100.0);
AnchorPane.setTopAnchor(boom, 300.0);
VBox root = new VBox(goButton, playfield);
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.setTitle("Sequential Transition");
primaryStage.show();
}
private void doAnimation(ActionEvent e) {
Random rng = new Random();
SequentialTransition seqTransition = new SequentialTransition(boom);
int i = 1;
while(i < 5){
Path path = new Path();
double x = (rng.ints(-100,400 + 1).iterator().next());
path.getElements().add (new MoveTo(x, -190));
path.getElements().add (new LineTo(x, 300));
PathTransition pathTransition = new PathTransition();
pathTransition.setDuration(Duration.millis(10000));
pathTransition.setNode(boom);
pathTransition.setPath(path);
pathTransition.setOrientation(PathTransition.OrientationType.NONE);
pathTransition.setAutoReverse(false);
seqTransition.getChildren().add(pathTransition);
i++;
}
seqTransition.play();
}
}