I need some help with a mysterious NullPointerException being thrown whenever I try to add an ArrayList populated with rectangles to a Pane using 'simulationPane.getChildren().addAll(wallList)'. I have tried a similar thing using an array of rectangles with the same results.
Absolutely any help is appreciated!
public class SimulationManager extends Application{
public static int currentTime;
public int agentNumber = 0;
public int initialFear = 0;
public Pane simulationPane;
public HBox controlPane;
public GridPane gridPane;
public BorderPane borderPane;
public boolean isPaused = false;
GenericAgent[] agentList;
ArrayList<Rectangle> wallList = new ArrayList<Rectangle>();
Rectangle wall1;
Rectangle wall2;
Rectangle wall3;
Rectangle wall4;
Rectangle wall5;
public static void main(String[] args) {
Application.launch( args);
}
public void createOneRoom() {
Rectangle wall1 = new Rectangle(0, 0, 500, 20);
Rectangle wall2 = new Rectangle(0, 500, 20, 500);
Rectangle wall3 = new Rectangle(500, 500, 500, 20);
Rectangle wall4 = new Rectangle(0, 0, 20, 200);
Rectangle wall5 = new Rectangle(300, 0, 20, 200);
wallList.add(wall1);
wallList.add(wall2);
wallList.add(wall3);
wallList.add(wall4);
wallList.add(wall5);
System.out.print(wallList);
}
public void createTwoRooms() {
//wallList = new Rectangle[13];
Rectangle room1Wall1 = new Rectangle();
Rectangle room1Wall2 = new Rectangle();
Rectangle room1Wall3 = new Rectangle();
Rectangle room1Wall4 = new Rectangle();
Rectangle room1Wall5 = new Rectangle();
Rectangle room2Wall1 = new Rectangle();
Rectangle room2Wall2 = new Rectangle();
Rectangle room2Wall3 = new Rectangle();
Rectangle room2Wall4 = new Rectangle();
Rectangle room2Wall5 = new Rectangle();
Rectangle corridor1 = new Rectangle();
Rectangle corridor2 = new Rectangle();
Rectangle corridor3 = new Rectangle();
wallList.add(room1Wall1);
wallList.add(room1Wall2);
wallList.add(room1Wall3);
wallList.add(room1Wall4);
wallList.add(room1Wall5);
wallList.add(room2Wall1);
wallList.add(room2Wall2);
wallList.add(room2Wall3);
wallList.add(room2Wall4);
wallList.add(room2Wall5);
wallList.add(corridor1);
wallList.add(corridor2);
wallList.add(corridor3);
}
public void createThreeRooms() {
}
public void createCornerRoom() {
}
public void startSimulation(int agentNumber, int initialFear, String level) {
agentList = new GenericAgent[agentNumber];
ArrayList<Rectangle> wallList = new ArrayList<Rectangle>();
//wallList = new Rectangle[50];
for (int i = 0; i < agentNumber; i++) {
if (Math.random() < 0.5) {
agentList[i] = new StandardAgent();
agentList[i].setFear(initialFear);
}
else if(Math.random() < 0.75) {
agentList[i] = new GentleAgent();
}
else {
agentList[i] = new AggrAgent();
}
}
if (level == "One room") {
createOneRoom();
System.out.println("A single room was created");
} else if (level == "Two rooms") {
createTwoRooms();
System.out.println("Two rooms were created");
} else if (level == "Three rooms") {
createThreeRooms();
System.out.println("Three rooms were created");
} else if (level == "Corner room") {
createCornerRoom();
System.out.println("A single corner room was created");
}
simulationPane.getChildren().addAll(wallList);
for (Rectangle wall : wallList) {
wall.setFill(Color.DARKGREY);
}
System.out.println("Number of agents created: " + agentList.length);
}
public void resetSimulation() {
agentNumber = 0;
initialFear = 0;
isPaused = false;
//TODO Remove all agents and walls.
}
//****************************************************************GUI**********************************************************************************//
@Override
public void start(Stage primaryStage) {
BorderPane borderPane = new BorderPane();
GridPane gridPane = new GridPane();
gridPane.setAlignment(Pos.CENTER);
Pane simulationPane = new Pane();
simulationPane.setPrefSize(500, 500);
HBox controlPane = new HBox();
Scene menuScene = new Scene(borderPane);
primaryStage.setTitle("Agent-Based Fear Simulation");
primaryStage.setScene(menuScene);
primaryStage.show();
gridPane.setStyle("-fx-background-color: black;");
gridPane.setAlignment(Pos.CENTER);
gridPane.setVgap(15);
gridPane.setHgap(5);
MenuBar menuBar = new MenuBar();
Menu menuFile = new Menu("File");
MenuItem miMenu = new MenuItem("Return to menu");
MenuItem miSave = new MenuItem("Save");
MenuItem miLoad = new MenuItem("Load");
MenuItem miClose = new MenuItem("Close ");
miMenu.setOnAction(e -> {
borderPane.setCenter(gridPane);
borderPane.setBottom(null);
resetSimulation();
});
miClose.setOnAction(e -> {Platform.exit();});
miSave.setOnAction(e -> {save();});
miLoad.setOnAction(e -> {selectFile();});
menuFile.getItems().addAll(miMenu, miSave, miLoad, miClose);
menuBar.getMenus().add(menuFile);
borderPane.setTop(menuBar);
borderPane.setCenter(gridPane);
Text agentText = new Text("Type in the number of agents:");
agentText.setFill(Color.WHITE);
gridPane.add(agentText, 0, 2);
Text fearText = new Text("Type in the initial fear value:");
fearText.setFill(Color.WHITE);
gridPane.add(fearText, 0, 4);
Text levelText = new Text("Select the environment:");
levelText.setFill(Color.WHITE);
gridPane.add(levelText, 0, 6);
Button startButton = new Button("Start the simulation");
gridPane.add(startButton, 1, 0);
/*Button testButton = new Button("Test");
simulationPane.getChildren().add(testButton);
Rectangle testRectangle = new Rectangle(10,10,10,10);
simulationPane.getChildren().add(testRectangle);*/
Button pauseButton = new Button("Pause/Play");
controlPane.getChildren().add(pauseButton);
pauseButton.setOnAction(e -> {isPaused = !isPaused;});
TextField agentNumberBox = new TextField();
gridPane.add(agentNumberBox, 1, 2);
TextField initialFearBox = new TextField();
gridPane.add(initialFearBox, 1, 4);
final ComboBox<String> levelBox = new ComboBox<String>();
levelBox.getItems().addAll("One room", "Two rooms", "Three rooms", "Corner room");
gridPane.add(levelBox, 1, 6);
levelBox.getSelectionModel().selectFirst();
/* As the user I want to be able to set the agent number
* As the user I want to be able to set the initial fear values
* As the user I want to be able to pick the simulation environment
* As the user I want to have a menu with all of the main functions of the simulation
*/
startButton.setOnAction(e -> {
try {
agentNumber = Integer.parseInt(agentNumberBox.getText());
initialFear = Integer.parseInt(initialFearBox.getText());
String level = levelBox.getValue();
borderPane.setCenter(null);
borderPane.setCenter(simulationPane);
borderPane.setBottom(controlPane);
startSimulation(agentNumber, initialFear, level);
} catch(NumberFormatException error) {
System.out.println("Error caught: wrong data type used.");
Alert alert = new Alert(AlertType.ERROR);
alert.setTitle("Error Initializing");
alert.setHeaderText("Oops, an error has been caught!");
alert.setContentText("Please use integers for the number of agents and the initial fear value.");
alert.showAndWait();
}
});
}
public void save() {
}
// User Story: As the user, I want to be able to select the file to load.
public void selectFile() {
FileChooser fileChooser = new FileChooser();
fileChooser.setTitle("Open Simulation File");
fileChooser.getExtensionFilters().addAll(
new ExtensionFilter("Comma Separated Values", "*.csv"));
File selectedFile = fileChooser.showOpenDialog(null);
if (selectedFile != null) {
loadFile(selectedFile);
}
}
public void loadFile(File selectedFile) {
}
}
