I have already completed Part 1. I will include the Java code below.

import javafx.application.Application; import javafx.stage.Stage; import javafx.scene.Scene; import javafx.scene.control.RadioButton; import javafx.scene.control.ToggleGroup; import javafx.scene.layout.StackPane; import javafx.scene.layout.VBox; import javafx.scene.layout.HBox; import javafx.scene.layout.BorderPane; import javafx.scene.paint.Color; import javafx.scene.shape.Circle; import javafx.scene.shape.Rectangle; import javafx.geometry.Pos;

public class TrafficLight extends Application { @Override // Override the start method in the Application calss public void start(Stage primaryStage) { // Create a vbox VBox paneForCircles = new VBox(5); paneForCircles.setAlignment(Pos.CENTER);

// Create three circles Circle c1 = getCircle(); Circle c2 = getCircle(); Circle c3 = getCircle(); c1.setFill(Color.RED);

// Place circles in vbox paneForCircles.getChildren().addAll(c1, c2, c3);

// Create a rectangle Rectangle rectangle = new Rectangle(); rectangle.setFill(Color.WHITE); rectangle.setWidth(30); rectangle.setHeight(100); rectangle.setStroke(Color.BLACK); rectangle.setStrokeWidth(2); StackPane stopSign = new StackPane(rectangle, paneForCircles);

// Create a hbox HBox paneForRadioButtons = new HBox(5); paneForRadioButtons.setAlignment(Pos.CENTER);

// Create radio buttons RadioButton rbRed = new RadioButton("Red"); RadioButton rbYellow = new RadioButton("Yellow"); RadioButton rbGreen = new RadioButton("Green");

// Create a toggle group ToggleGroup group = new ToggleGroup(); rbRed.setToggleGroup(group); rbYellow.setToggleGroup(group); rbGreen.setToggleGroup(group); rbRed.setSelected(true); paneForRadioButtons.getChildren().addAll(rbRed, rbYellow, rbGreen);

// Create a border pane BorderPane pane = new BorderPane(); pane.setCenter(stopSign); pane.setBottom(paneForRadioButtons);

// Create and register handlers rbRed.setOnAction(e -> { if (rbRed.isSelected()) { c1.setFill(Color.RED); c2.setFill(Color.WHITE); c3.setFill(Color.WHITE); } });

rbYellow.setOnAction(e -> { if (rbYellow.isSelected()) { c1.setFill(Color.WHITE); c2.setFill(Color.YELLOW); c3.setFill(Color.WHITE); } });

rbGreen.setOnAction(e -> { if (rbGreen.isSelected()) { c1.setFill(Color.WHITE); c2.setFill(Color.WHITE); c3.setFill(Color.GREEN); } });

// Create a scene and place it in the stage Scene scene = new Scene(pane, 200, 150); primaryStage.setTitle("Exercise_16_03"); // Set the stage title primaryStage.setScene(scene); // Place the scene in the stage primaryStage.show(); // Display the stage }

/** Return a circle */ private Circle getCircle() { Circle c = new Circle(10); c.setFill(Color.WHITE); c.setStroke(Color.BLACK); return c; } }

PE 16-1 TrafficLight Part 1 Write a program that simulates a traffic light. Traffic Light Part 1: The program lets the user select one of three lights: red, yellow, or green. When a radio button is selected, the light is turned on. Only one light can be on at a time. No light is on when the program starts. PE 16-2 TrafficLight Part 2 1. Automate the stoplight from PE16-1 so that it changes color automatically after an appropriate amount of time. (i.e. cycles like a real stoplight) 2. Replace the color buttons with a "start" and "stop" button to control the light