Homework Answers
CODE
=============
TicTacToe.java
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.*;
import javafx.beans.value.*;
import javafx.event.*;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.image.*;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.*;
import javafx.stage.Stage;
import java.util.*;
public class TicTacToe extends Application {
@Override public void start(Stage stage) throws Exception {
GameManager gameManager = new GameManager();
Scene scene = gameManager.getGameScene();
scene.getStylesheets().add(
getResource(
"tictactoe.css"
)
);
stage.setTitle("Tic-Tac-Toe");
stage.getIcons().add(SquareSkin.crossImage);
stage.setScene(scene);
stage.show();
}
private String getResource(String resourceName) {
return getClass().getResource(resourceName).toExternalForm();
}
public static void main(String[] args) {
Application.launch(TicTacToe.class);
}
}
class GameManager {
private Scene gameScene;
private Game game;
GameManager() {
newGame();
}
public void newGame() {
game = new Game(this);
if (gameScene == null) {
gameScene = new Scene(game.getSkin());
} else {
gameScene.setRoot(game.getSkin());
}
}
public void quit() {
gameScene.getWindow().hide();
}
public Game getGame() {
return game;
}
public Scene getGameScene() {
return gameScene;
}
}
class GameControls extends HBox {
GameControls(final GameManager gameManager, final Game game) {
getStyleClass().add("game-controls");
visibleProperty().bind(game.gameOverProperty());
Label playAgainLabel = new Label("Play Again?");
playAgainLabel.getStyleClass().add("info");
Button playAgainButton = new Button("Yes");
playAgainButton.getStyleClass().add("play-again");
playAgainButton.setDefaultButton(true);
playAgainButton.setOnAction(new EventHandler<ActionEvent>() {
@Override public void handle(ActionEvent actionEvent) {
gameManager.newGame();
}
});
Button exitButton = new Button("No");
playAgainButton.getStyleClass().add("exit");
exitButton.setCancelButton(true);
exitButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent actionEvent) {
gameManager.quit();
}
});
getChildren().setAll(
playAgainLabel,
playAgainButton,
exitButton
);
}
}
class StatusIndicator extends HBox {
private final ImageView playerToken = new ImageView();
private final Label playerLabel = new Label("Current Player: ");
StatusIndicator(Game game) {
getStyleClass().add("status-indicator");
bindIndicatorFieldsToGame(game);
playerToken.setFitHeight(32);
playerToken.setPreserveRatio(true);
playerLabel.getStyleClass().add("info");
getChildren().addAll(playerLabel, playerToken);
}
private void bindIndicatorFieldsToGame(Game game) {
playerToken.imageProperty().bind(
Bindings.when(
game.currentPlayerProperty().isEqualTo(Square.State.NOUGHT)
)
.then(SquareSkin.noughtImage)
.otherwise(
Bindings.when(
game.currentPlayerProperty().isEqualTo(Square.State.CROSS)
)
.then(SquareSkin.crossImage)
.otherwise((Image) null)
)
);
playerLabel.textProperty().bind(
Bindings.when(
game.gameOverProperty().not()
)
.then("Current Player: ")
.otherwise(
Bindings.when(
game.winnerProperty().isEqualTo(Square.State.EMPTY)
)
.then("Draw")
.otherwise("Winning Player: ")
)
);
}
}
class Game {
private GameSkin skin;
private Board board = new Board(this);
private WinningStrategy winningStrategy = new WinningStrategy(board);
private ReadOnlyObjectWrapper<Square.State> currentPlayer = new ReadOnlyObjectWrapper<>(Square.State.CROSS);
public ReadOnlyObjectProperty<Square.State> currentPlayerProperty() {
return currentPlayer.getReadOnlyProperty();
}
public Square.State getCurrentPlayer() {
return currentPlayer.get();
}
private ReadOnlyObjectWrapper<Square.State> winner = new ReadOnlyObjectWrapper<>(Square.State.EMPTY);
public ReadOnlyObjectProperty<Square.State> winnerProperty() {
return winner.getReadOnlyProperty();
}
private ReadOnlyBooleanWrapper drawn = new ReadOnlyBooleanWrapper(false);
public ReadOnlyBooleanProperty drawnProperty() {
return drawn.getReadOnlyProperty();
}
public boolean isDrawn() {
return drawn.get();
}
private ReadOnlyBooleanWrapper gameOver = new ReadOnlyBooleanWrapper(false);
public ReadOnlyBooleanProperty gameOverProperty() {
return gameOver.getReadOnlyProperty();
}
public boolean isGameOver() {
return gameOver.get();
}
public Game(GameManager gameManager) {
gameOver.bind(
winnerProperty().isNotEqualTo(Square.State.EMPTY)
.or(drawnProperty())
);
skin = new GameSkin(gameManager, this);
}
public Board getBoard() {
return board;
}
public void nextTurn() {
if (isGameOver()) return;
switch (currentPlayer.get()) {
case EMPTY:
case NOUGHT: currentPlayer.set(Square.State.CROSS); break;
case CROSS: currentPlayer.set(Square.State.NOUGHT); break;
}
}
private void checkForWinner() {
winner.set(winningStrategy.getWinner());
drawn.set(winningStrategy.isDrawn());
if (isDrawn()) {
currentPlayer.set(Square.State.EMPTY);
}
}
public void boardUpdated() {
checkForWinner();
}
public Parent getSkin() {
return skin;
}
}
class GameSkin extends VBox {
GameSkin(GameManager gameManager, Game game) {
getChildren().addAll(
game.getBoard().getSkin(),
new StatusIndicator(game),
new GameControls(gameManager, game)
);
}
}
class WinningStrategy {
private final Board board;
private static final int NOUGHT_WON = 3;
private static final int CROSS_WON = 30;
private static final Map<Square.State, Integer> values = new HashMap<>();
static {
values.put(Square.State.EMPTY, 0);
values.put(Square.State.NOUGHT, 1);
values.put(Square.State.CROSS, 10);
}
public WinningStrategy(Board board) {
this.board = board;
}
public Square.State getWinner() {
for (int i = 0; i < 3; i++) {
int score = 0;
for (int j = 0; j < 3; j++) {
score += valueOf(i, j);
}
if (isWinning(score)) {
return winner(score);
}
}
for (int i = 0; i < 3; i++) {
int score = 0;
for (int j = 0; j < 3; j++) {
score += valueOf(j, i);
}
if (isWinning(score)) {
return winner(score);
}
}
int score = 0;
score += valueOf(0, 0);
score += valueOf(1, 1);
score += valueOf(2, 2);
if (isWinning(score)) {
return winner(score);
}
score = 0;
score += valueOf(2, 0);
score += valueOf(1, 1);
score += valueOf(0, 2);
if (isWinning(score)) {
return winner(score);
}
return Square.State.EMPTY;
}
public boolean isDrawn() {
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
if (board.getSquare(i, j).getState() == Square.State.EMPTY) {
return false;
}
}
}
return getWinner() == Square.State.EMPTY;
}
private Integer valueOf(int i, int j) {
return values.get(board.getSquare(i, j).getState());
}
private boolean isWinning(int score) {
return score == NOUGHT_WON || score == CROSS_WON;
}
private Square.State winner(int score) {
if (score == NOUGHT_WON) return Square.State.NOUGHT;
if (score == CROSS_WON) return Square.State.CROSS;
return Square.State.EMPTY;
}
}
class Board {
private final BoardSkin skin;
private final Square[][] squares = new Square[3][3];
public Board(Game game) {
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
squares[i][j] = new Square(game);
}
}
skin = new BoardSkin(this);
}
public Square getSquare(int i, int j) {
return squares[i][j];
}
public Node getSkin() {
return skin;
}
}
class BoardSkin extends GridPane {
BoardSkin(Board board) {
getStyleClass().add("board");
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
add(board.getSquare(i, j).getSkin(), i, j);
}
}
}
}
class Square {
enum State { EMPTY, NOUGHT, CROSS }
private final SquareSkin skin;
private ReadOnlyObjectWrapper<State> state = new ReadOnlyObjectWrapper<>(State.EMPTY);
public ReadOnlyObjectProperty<State> stateProperty() {
return state.getReadOnlyProperty();
}
public State getState() {
return state.get();
}
private final Game game;
public Square(Game game) {
this.game = game;
skin = new SquareSkin(this);
}
public void pressed() {
if (!game.isGameOver() && state.get() == State.EMPTY) {
state.set(game.getCurrentPlayer());
game.boardUpdated();
game.nextTurn();
}
}
public Node getSkin() {
return skin;
}
}
class SquareSkin extends StackPane {
static final Image noughtImage = new Image(
"http://icons.iconarchive.com/icons/double-j-design/origami-colored-pencil/128/green-cd-icon.png"
);
static final Image crossImage = new Image(
"http://icons.iconarchive.com/icons/double-j-design/origami-colored-pencil/128/blue-cross-icon.png"
);
private final ImageView imageView = new ImageView();
SquareSkin(final Square square) {
getStyleClass().add("square");
imageView.setMouseTransparent(true);
getChildren().setAll(imageView);
setPrefSize(crossImage.getHeight() + 20, crossImage.getHeight() + 20);
setOnMousePressed(new EventHandler<MouseEvent>() {
@Override public void handle(MouseEvent mouseEvent) {
square.pressed();
}
});
square.stateProperty().addListener(new ChangeListener<Square.State>() {
@Override public void changed(ObservableValue<? extends Square.State> observableValue, Square.State oldState, Square.State state) {
switch (state) {
case EMPTY: imageView.setImage(null); break;
case NOUGHT: imageView.setImage(noughtImage); break;
case CROSS: imageView.setImage(crossImage); break;
}
}
});
}
}
TicTacToe.css
.root {
-fx-background-color: midnightblue;
-fx-padding: 30px;
-fx-font-size: 20px;
-fx-font-family: "Comic Sans MS";
}
.info {
-fx-text-fill: whitesmoke;
}
.button {
-fx-base: antiquewhite;
}
.game-controls {
-fx-spacing: 20px;
-fx-alignment: center;
}
.status-indicator {
-fx-alignment: center;
-fx-padding: 16px;
}
.board {
-fx-background-color: slategrey;
-fx-hgap: 10px;
-fx-vgap: 10px;
/**-fx-effect: dropshadow(gaussian, slategrey, 20, 0, 0, 0);*/ /* effect disabled as it causes texture tearing on java 8b79 ea for OS X*/
}
.square {
-fx-padding: 10px;
-fx-background-color: azure;
}
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