Homework -2017 Spring T x prp2.v2-pp2.v2.pdf rbdav/pid-29812865-dt content rid 1

Question

Homework -2017 Spring T x prp2.v2-pp2.v2.pdf rbdav/pid-29812865-dt content rid 131060592ucourses/IC01 Automatic Zoom Programming assignment #2 Due by 11:59pm, Wednesday, May. 31th, 2016 In this project, you are required to build a simple two-player game called Tic-Tac-Toe Tic-tac-toe (also known as noughts and crosses or Xs and Os) is a paper-and-pencil game for two players, X and O, who take turns marking the spaces in a 3x3grid. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row wins the game. (via Wikipedia.) Two players should be able to play with each other on two computers. Your program shoule be able to connect with another instance of your program and then start to play. Each player place a mark on the grid, and the play should be displayed on both side. When it reaches the final stage, both side should display the result, win, lose or draw. After a game finished, player can choose to play another round, if both sides agree to play, a new set will start, otherwise connection will be terminated.

Explanation / Answer

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* Tic-Tac-Toe: Two-player Game
*/
public class TicTacToe extends JFrame {
// Named-constants for the game board
public static final int ROWS = 3; // ROWS by COLS cells
public static final int COLS = 3;

// Named-constants of the various dimensions used for graphics drawing
public static final int CELL_SIZE = 100; // cell width and height (square)
public static final int CANVAS_WIDTH = CELL_SIZE * COLS; // the drawing canvas
public static final int CANVAS_HEIGHT = CELL_SIZE * ROWS;
public static final int GRID_WIDTH = 8; // Grid-line's width
public static final int GRID_WIDHT_HALF = GRID_WIDTH / 2; // Grid-line's half-width
// Symbols (cross/nought) are displayed inside a cell, with padding from border
public static final int CELL_PADDING = CELL_SIZE / 6;
public static final int SYMBOL_SIZE = CELL_SIZE - CELL_PADDING * 2; // width/height
public static final int SYMBOL_STROKE_WIDTH = 8; // pen's stroke width

// Use an enumeration (inner class) to represent the various states of the game
public enum GameState {
PLAYING, DRAW, CROSS_WON, NOUGHT_WON
}
private GameState currentState; // the current game state

// Use an enumeration (inner class) to represent the seeds and cell contents
public enum Seed {
EMPTY, CROSS, NOUGHT
}
private Seed currentPlayer; // the current player

private Seed[][] board ; // Game board of ROWS-by-COLS cells
private DrawCanvas canvas; // Drawing canvas (JPanel) for the game board
private JLabel statusBar; // Status Bar

/** Constructor to setup the game and the GUI components */
public TicTacToe() {
canvas = new DrawCanvas(); // Construct a drawing canvas (a JPanel)
canvas.setPreferredSize(new Dimension(CANVAS_WIDTH, CANVAS_HEIGHT));

// The canvas (JPanel) fires a MouseEvent upon mouse-click
canvas.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) { // mouse-clicked handler
int mouseX = e.getX();
int mouseY = e.getY();
// Get the row and column clicked
int rowSelected = mouseY / CELL_SIZE;
int colSelected = mouseX / CELL_SIZE;

if (currentState == GameState.PLAYING) {
if (rowSelected >= 0 && rowSelected < ROWS && colSelected >= 0
&& colSelected < COLS && board[rowSelected][colSelected] == Seed.EMPTY) {
board[rowSelected][colSelected] = currentPlayer; // Make a move
updateGame(currentPlayer, rowSelected, colSelected); // update state
// Switch player
currentPlayer = (currentPlayer == Seed.CROSS) ? Seed.NOUGHT : Seed.CROSS;
}
} else { // game over
initGame(); // restart the game
}
// Refresh the drawing canvas
repaint(); // Call-back paintComponent().
}
});

// Setup the status bar (JLabel) to display status message
statusBar = new JLabel(" ");
statusBar.setFont(new Font(Font.DIALOG_INPUT, Font.BOLD, 15));
statusBar.setBorder(BorderFactory.createEmptyBorder(2, 5, 4, 5));

Container cp = getContentPane();
cp.setLayout(new BorderLayout());
cp.add(canvas, BorderLayout.CENTER);
cp.add(statusBar, BorderLayout.PAGE_END); // same as SOUTH

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack(); // pack all the components in this JFrame
setTitle("Tic Tac Toe");
setVisible(true); // show this JFrame

board = new Seed[ROWS][COLS]; // allocate array
initGame(); // initialize the game board contents and game variables
}

/** Initialize the game-board contents and the status */
public void initGame() {
for (int row = 0; row < ROWS; ++row) {
for (int col = 0; col < COLS; ++col) {
board[row][col] = Seed.EMPTY; // all cells empty
}
}
currentState = GameState.PLAYING; // ready to play
currentPlayer = Seed.CROSS; // cross plays first
}

/** Update the currentState after the player with "theSeed" has placed on
(rowSelected, colSelected). */
public void updateGame(Seed theSeed, int rowSelected, int colSelected) {
if (hasWon(theSeed, rowSelected, colSelected)) { // check for win
currentState = (theSeed == Seed.CROSS) ? GameState.CROSS_WON : GameState.NOUGHT_WON;
} else if (isDraw()) { // check for draw
currentState = GameState.DRAW;
}
// Otherwise, no change to current state (still GameState.PLAYING).
}

/** Return true if it is a draw (i.e., no more empty cell) */
public boolean isDraw() {
for (int row = 0; row < ROWS; ++row) {
for (int col = 0; col < COLS; ++col) {
if (board[row][col] == Seed.EMPTY) {
return false; // an empty cell found, not draw, exit
}
}
}
return true; // no more empty cell, it's a draw
}

/** Return true if the player with "theSeed" has won after placing at
(rowSelected, colSelected) */
public boolean hasWon(Seed theSeed, int rowSelected, int colSelected) {
return (board[rowSelected][0] == theSeed // 3-in-the-row
&& board[rowSelected][1] == theSeed
&& board[rowSelected][2] == theSeed
|| board[0][colSelected] == theSeed // 3-in-the-column
&& board[1][colSelected] == theSeed
&& board[2][colSelected] == theSeed
|| rowSelected == colSelected // 3-in-the-diagonal
&& board[0][0] == theSeed
&& board[1][1] == theSeed
&& board[2][2] == theSeed
|| rowSelected + colSelected == 2 // 3-in-the-opposite-diagonal
&& board[0][2] == theSeed
&& board[1][1] == theSeed
&& board[2][0] == theSeed);
}

/**
* Inner class DrawCanvas (extends JPanel) used for custom graphics drawing.
*/
class DrawCanvas extends JPanel {
@Override
public void paintComponent(Graphics g) { // invoke via repaint()
super.paintComponent(g); // fill background
setBackground(Color.WHITE); // set its background color

// Draw the grid-lines
g.setColor(Color.LIGHT_GRAY);
for (int row = 1; row < ROWS; ++row) {
g.fillRoundRect(0, CELL_SIZE * row - GRID_WIDHT_HALF,
CANVAS_WIDTH-1, GRID_WIDTH, GRID_WIDTH, GRID_WIDTH);
}
for (int col = 1; col < COLS; ++col) {
g.fillRoundRect(CELL_SIZE * col - GRID_WIDHT_HALF, 0,
GRID_WIDTH, CANVAS_HEIGHT-1, GRID_WIDTH, GRID_WIDTH);
}

// Draw the Seeds of all the cells if they are not empty
// Use Graphics2D which allows us to set the pen's stroke
Graphics2D g2d = (Graphics2D)g;
g2d.setStroke(new BasicStroke(SYMBOL_STROKE_WIDTH, BasicStroke.CAP_ROUND,
BasicStroke.JOIN_ROUND)); // Graphics2D only
for (int row = 0; row < ROWS; ++row) {
for (int col = 0; col < COLS; ++col) {
int x1 = col * CELL_SIZE + CELL_PADDING;
int y1 = row * CELL_SIZE + CELL_PADDING;
if (board[row][col] == Seed.CROSS) {
g2d.setColor(Color.RED);
int x2 = (col + 1) * CELL_SIZE - CELL_PADDING;
int y2 = (row + 1) * CELL_SIZE - CELL_PADDING;
g2d.drawLine(x1, y1, x2, y2);
g2d.drawLine(x2, y1, x1, y2);
} else if (board[row][col] == Seed.NOUGHT) {
g2d.setColor(Color.BLUE);
g2d.drawOval(x1, y1, SYMBOL_SIZE, SYMBOL_SIZE);
}
}
}

// Print status-bar message
if (currentState == GameState.PLAYING) {
statusBar.setForeground(Color.BLACK);
if (currentPlayer == Seed.CROSS) {
statusBar.setText("X's Turn");
} else {
statusBar.setText("O's Turn");
}
} else if (currentState == GameState.DRAW) {
statusBar.setForeground(Color.RED);
statusBar.setText("It's a Draw! Click to play again.");
} else if (currentState == GameState.CROSS_WON) {
statusBar.setForeground(Color.RED);
statusBar.setText("'X' Won! Click to play again.");
} else if (currentState == GameState.NOUGHT_WON) {
statusBar.setForeground(Color.RED);
statusBar.setText("'O' Won! Click to play again.");
}
}
}

/** The entry main() method */
public static void main(String[] args) {
// Run GUI codes in the Event-Dispatching thread for thread safety
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new TicTacToe(); // Let the constructor do the job
}
});
}
}

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