76 TicTacToe 76 TicTacToe 76 TicTacToe X00 OXX XXO XO O won! The game is over X won! The game is over Draw! The game is over (a) The X player won the game (b) Draw-no winners (c) The O player won the game
Write a program that plays the tic-tac-toe game. Two players take turns clicking an available cell in a grid with their respective tokens (either X or O). When one player has placed three tokens in a horizontal, vertical,
or diagonal row on the grid, the game is over and that player has won. A draw (no winner) occurs when all the cells in the grid have been filled with tokens and neither player has achieved a win. Figure 12.17 shows the representative sample runs of the example.
Assume that all the cells are initially empty, and that the first player takes the X token and the second player the O token. To mark a cell, the player points the mouse to the cell and clicks it. If the cell is empty, the token (X or O) is displayed. If the cell is already filled, the player’s action is ignored.
Define a custom class named Cell that extends Label for displaying a token and for responding to the button-click event. The class contains a data field token with three possible values—' ', X, and O—that denote whether the cell has been occupied and which token is used in the cell if it is occupied. The three image files x.gif, o.gif, and empty.gif can be obtained from cs.armstrong.edu/liang/py/book.zip in the image folder. Use these three images to display the X, O, and empty cells.
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