// APS101, Winter 2009: Lecture 29 (Mar. 23)
//
// Review: last time we kept developing our Tic-Tac-Toe game.

// we wrote methods rowWinner(), colWinner(), and diagWinner()

// now, let's put all of these into one method: getWinner()
TicTacToe t = new TicTacToe();
t
t.getWinner() // returns ' '
t.setMark('X', 0, 0)
t.setMark('X', 1, 0)
t.setMark('X', 2, 0) // this produces a column winner 'X'!
t
t.getWinner() // returns 'X'

// but there is another possible outcome of a tic-tac-toe game...
// a draw! so let's write method isDraw(), and test it. 

TicTacToe t = new TicTacToe();
t
t.isDraw() // returns false... why?

// (we simulated playing a game where no one won, 
    and all the squares on the grid were taken up.)

t.isDraw() // returns true now. 

// we also wrote method getMark(int r, int c).
// (it will be useful for the next part of the process)

// what's wrong with the game as it is now? Not very user-friendly!
// we need to write a Graphical User Interface (GUI) for our game. 

// (see TTTWindow.java)
// - we use JLabels to display the squares containing X's and O's
// - we put all the graphical elements into the JFrame's content pane

// JFrame
//   getContentPane()
//   pack()

// Container (in the awt package)
//   setLayout(new GridLayout(M,N))

// JLabel 
//   setBorder(new LineBorder(Color.BLACK));
//   setHorizontalAlignment(SwingConstants.CENTER);
//   setVerticalAlignment(SwingConstants.CENTER);
//   setText(String);

TicTacToe t = new TicTacToe();
t
TTTWindow w = new TTTWindow(t); // empty grid
t.setMark('X', 1, 1); // nothing changed in the GUI...
w.update(1, 1); // now it displays the new 'X'