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tictactoe.js
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tictactoe.js
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// This class handles the graphical part
class TicTacToe {
constructor( context, language ) {
this.context = context;
this.language = language;
this.winner = '';
this.player = 'X';
this.resetGame();
}
// Draws the 2 vertical and 2 horizontal lines
drawGrid() {
this.context.clearRect(0, 0, 300, 300);
this.context.lineWidth = 5;
this.context.beginPath();
this.context.moveTo(100, 0);
this.context.lineTo(100, 300);
this.context.moveTo(200, 0);
this.context.lineTo(200, 300);
this.context.moveTo(0, 100);
this.context.lineTo(300, 100);
this.context.moveTo(0, 200);
this.context.lineTo(300, 200);
this.context.strokeStyle = '#000000';
this.context.stroke();
this.context.closePath();
}
// Input: position on the board (0..9)
// Ouput: true of position is empty, false otherwise
positionIsEmpty( position ) {
if( this.positions[ position ] == '-' ) {
return true;
} else {
return false;
}
}
// Sets a player (X or O) at the given position
setPlayerAtPosition( player, position ) {
// Place the player
this.positions[ position ] = player;
if( player == 'X' ) {
this.drawX( position );
this.isItXsTurn = false;
} else {
this.drawO( position );
this.isItXsTurn = true;
}
// Check for win/loose/draw
this.checkGameState();
}
// Draws an X at the given position
drawX( position ) {
var cellX = position%3;
var cellY = Math.floor(position/3 )
var i = 0, dx, dy;
this.context.beginPath();
for (i = 0; i < 2; i++) {
dx = (cellX * 100) + 10 + (80*i);
dy = (cellY * 100) + 10;
this.context.moveTo(dx, dy);
dx = (cellX * 100) + 90 - (80*i);
dy = (cellY * 100) + 90;
this.context.lineTo(dx, dy);
}
this.context.strokeStyle = '#3333ff';
this.context.stroke();
this.context.closePath();
}
// Draws an O at the given positon
drawO( position ) {
var cellX = position%3;
var cellY = Math.floor(position/3 )
this.context.beginPath();
this.context.arc(
cellX*100 + 50,
cellY*100 + 50,
40,
0,
Math.PI * 2,
false
);
this.context.strokeStyle = '#ff3333';
this.context.stroke();
this.context.closePath();
}
checkGameState() {
// All possible ways of winning the game
var winningPatterns = [
[0, 1, 2 ],
[3, 4, 5 ],
[6, 7, 8 ],
[0, 3, 6 ],
[1, 4, 7 ],
[2, 5, 8 ],
[0, 4, 8 ],
[2, 4, 6 ]
];
// Check if there are no positions to fill anymore
this.gameHasEnded = true;
this.winner = '';
for ( var i = 0; i < this.positions.length; i++) {
if ( this.positions[ i ] == '-' ) {
this.gameHasEnded = false;
break;
}
}
// Check all winning patterns for a match
for ( var i = 0; i < winningPatterns.length; i++) {
if (
this.positions[ winningPatterns[ i ][ 0 ] ] == this.positions[ winningPatterns[ i ][ 1 ] ] &&
this.positions[ winningPatterns[ i ][ 1 ] ] == this.positions[ winningPatterns[ i ][ 2 ] ]
) {
if ( this.positions[ winningPatterns[ i ][ 0 ] ] != '-' ) {
this.gameHasEnded = true;
this.drawWin( winningPatterns[ i ][ 0 ], winningPatterns[ i ][ 2 ] );
this.winner = this.positions[ winningPatterns[ i ][ 0 ] ];
}
}
}
// Adjust info message based
if (this.gameHasEnded) {
let text = "";
if (this.language == 'EN') {
switch (this.winner) {
case 'X': text = 'X won. Click to start again.'; break;
case 'O': text = 'O won. Click to start again'; break;
case '': text = 'A draw. Click to start again.'; break;
}
} else {
switch (this.winner) {
case 'X': text = 'X heeft gewonnen. Klik om opnieuw te beginnen.'; break;
case 'O': text = 'O heeft gewonnen. Klik om opnieuw te beginnen.'; break;
case '': text = 'Gelijkspel. Klik om opnieuw te beginnen.'; break;
}
}
document.getElementById('tttmessage').innerHTML = text;
}
}
// Draws a line marking the winning pattern
drawWin( posA, posB ) {
var posAX = posA%3 *100+50;
var posAY = Math.floor( posA/3 )*100+50
var posBX = posB%3*100+50;
var posBY = Math.floor( posB/3 )*100+50
this.context.beginPath();
this.context.moveTo(posAX, posAY);
this.context.lineTo(posBX, posBY);
this.context.strokeStyle = '#33ff33';
this.context.stroke();
this.context.closePath();
}
// Resets the game (o rly?)
resetGame() {
this.positions = [
'-', '-', '-',
'-', '-', '-',
'-', '-', '-'
];
this.drawGrid();
this.isItXsTurn = true;
this.gameHasEnded = false;
if (this.player == 'O') {
let move = new IntelligentForceAI().getBestMove(ttt.getBoard(), 'X');
this.setPlayerAtPosition( 'X', move );
}
if (this.language == "EN") {
document.getElementById('tttmessage').innerHTML = 'Place your ' + this.player + '.';
} else {
document.getElementById('tttmessage').innerHTML = 'Plaats je ' + this.player + '.';
}
}
// Returns the board a a string
getBoard() {
return this.positions.join('');
}
// Makes the player O instead of X and vice versa
changePlayer() {
this.player == 'X' ? this.player = 'O' : this.player = 'X';
this.resetGame();
}
}
// Handling the events
document.onreadystatechange = function () {
if (document.readyState === 'complete') {
// Initialize instance
tttcanvas = document.getElementById('tttcanvas');
tttcontext = tttcanvas.getContext('2d');
ttt = new TicTacToe( tttcontext, 'EN' ); // Change this to NL if you want the Dutch version
if (ttt.language == 'EN') {
document.getElementById('tttbutton').innerHTML = 'Change O/X';
} else {
document.getElementById('tttbutton').innerHTML = 'Wissel O/X';
}
// Handling clicks on the board
tttcanvas.addEventListener('click', (e) => {
x = e.offsetX / 100 | 0;
y = e.offsetY / 100 | 0;
clickedPosition = x + y*3;
if( ttt.gameHasEnded ) {
ttt.resetGame();
} else {
if( ttt.isItXsTurn && ttt.player == 'X') {
if( ttt.positionIsEmpty( clickedPosition ) ) {
ttt.setPlayerAtPosition( 'X', clickedPosition );
if( !ttt.gameHasEnded ) {
move = new IntelligentForceAI().getBestMove(ttt.getBoard(), 'O');
ttt.setPlayerAtPosition( 'O', move );
}
}
}
if( !ttt.isItXsTurn && ttt.player == 'O') {
if( ttt.positionIsEmpty( clickedPosition ) ) {
ttt.setPlayerAtPosition( 'O', clickedPosition );
if( !ttt.gameHasEnded ) {
move = new IntelligentForceAI().getBestMove(ttt.getBoard(), 'X');
ttt.setPlayerAtPosition( 'X', move );
}
}
}
}
});
// Handling clicks on the change O/X button
button = document.getElementById('tttbutton');
button.addEventListener('click', (e) => {
ttt.changePlayer();
});
}
}