JavaFX and Scene Builder - Dodge the red rectangles!

Controller.java

package sample;

import javafx.animation.*;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.layout.AnchorPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.util.Duration;

import java.net.URL;
import java.util.ArrayList;
import java.util.Random;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    @FXML
    private Rectangle shape1;

    @FXML
    private AnchorPane scene;

    private Random random = new Random();

    private TranslateTransition transition;

    private ArrayList<Rectangle> dangerousRectangles = new ArrayList<>();

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {

        MovementController movementController = new MovementController(shape1, scene);

        timeline.setCycleCount(Animation.INDEFINITE);

        collisionTimer.start();
    }

    @FXML
    void start(ActionEvent event) {
        if(timeline.getStatus() == Animation.Status.RUNNING){
            timeline.stop();
        } else {
            timeline.play();
        }
    }

    Timeline timeline = new Timeline(new KeyFrame(Duration.seconds(1), e ->{
        Rectangle rectangle = createDangerShape();
        scene.getChildren().add(rectangle);
        dangerousRectangles.add(rectangle);
        transition.play();
    }));


    AnimationTimer collisionTimer = new AnimationTimer() {
        @Override
        public void handle(long timestamp) {

            for (Rectangle rectangle: dangerousRectangles) {
                if(rectangle != null){
                    checkCollision(shape1,rectangle);
                }
            }
        }
    };


    public void checkCollision(Rectangle shape1, Rectangle collisionShape){

        if(shape1.getBoundsInParent().intersects(collisionShape.getBoundsInParent())){
            timeline.stop();
            System.out.println("Game over!");
        }
    }

    public Rectangle createDangerShape(){
        int recHeightX = random.nextInt(250);

        int recHeight = 25 + random.nextInt(100);
        int recWidth = 25 + random.nextInt(100);

        Rectangle rectangle = new Rectangle(700,recHeightX,recHeight,recWidth);

        rectangle.setFill(Color.RED);

        transition = new TranslateTransition();

        transition.setNode(rectangle);
        transition.setDuration(Duration.seconds(5));
        transition.setToX(-900);
        transition.setOnFinished(e ->{
            scene.getChildren().remove(rectangle);
            dangerousRectangles.remove(rectangle);
        });
        return rectangle;
    }
}

Main.java

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();

    }


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

MovementController.java

package sample;

import javafx.animation.AnimationTimer;
import javafx.beans.binding.BooleanBinding;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.fxml.FXML;
import javafx.scene.input.KeyCode;
import javafx.scene.layout.AnchorPane;
import javafx.scene.shape.Rectangle;

public class MovementController {

    private BooleanProperty wPressed = new SimpleBooleanProperty();
    private BooleanProperty aPressed = new SimpleBooleanProperty();
    private BooleanProperty sPressed = new SimpleBooleanProperty();
    private BooleanProperty dPressed = new SimpleBooleanProperty();

    private BooleanBinding keyPressed = wPressed.or(aPressed).or(sPressed).or(dPressed);

    private int movementVariable = 2;

    @FXML
    private Rectangle shape1;

    @FXML
    private AnchorPane scene;

    public MovementController(Rectangle shape1, AnchorPane scene) {
        this.shape1 = shape1;
        this.scene = scene;

        movementSetup();

        keyPressed.addListener(((observableValue, aBoolean, t1) -> {
            if(!aBoolean){
                timer.start();
            } else {
                timer.stop();
            }
        }));
    }

    AnimationTimer timer = new AnimationTimer() {
        @Override
        public void handle(long timestamp) {

            if(wPressed.get()) {
                shape1.setLayoutY(shape1.getLayoutY() - movementVariable);
            }

            if(sPressed.get()){
                shape1.setLayoutY(shape1.getLayoutY() + movementVariable);
            }

            if(aPressed.get()){
                shape1.setLayoutX(shape1.getLayoutX() - movementVariable);
            }

            if(dPressed.get()){
                shape1.setLayoutX(shape1.getLayoutX() + movementVariable);
            }
        }
    };

    public void movementSetup(){
        scene.setOnKeyPressed(e -> {
            if(e.getCode() == KeyCode.W) {
                wPressed.set(true);
            }

            if(e.getCode() == KeyCode.A) {
                aPressed.set(true);
            }

            if(e.getCode() == KeyCode.S) {
                sPressed.set(true);
            }

            if(e.getCode() == KeyCode.D) {
                dPressed.set(true);
            }
        });

        scene.setOnKeyReleased(e ->{
            if(e.getCode() == KeyCode.W) {
                wPressed.set(false);
            }

            if(e.getCode() == KeyCode.A) {
                aPressed.set(false);
            }

            if(e.getCode() == KeyCode.S) {
                sPressed.set(false);
            }

            if(e.getCode() == KeyCode.D) {
                dPressed.set(false);
            }
        });
    }
}

Sample.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.shape.Rectangle?>

<AnchorPane fx:id="scene" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <Rectangle fx:id="shape1" arcHeight="5.0" arcWidth="5.0" fill="DODGERBLUE" height="40.0" layoutX="280.0" layoutY="200.0" stroke="BLACK" strokeType="INSIDE" width="40.0" />
      <Button layoutX="278.0" layoutY="26.0" mnemonicParsing="false" onAction="#start" text="Start" />
   </children>
</AnchorPane>