blockSize = 8;
gameHeight = 70;
gameWidth  = 50;
TRON_BLOCK = 1;
keyListener = new Object();
keyListener.onKeyDown = function() {
    	var keyCode = Key.getCode();
    	if (keyCode > 36 && keyCode < 41) {
            	if (game.onEnterFrame != undefined) { 
           			  if (keyCode-37 != turnQueue[0]) { 
              			       	turnQueue.unshift(keyCode-37); 
          			  }
     	}
    	} else if (keyCode == 32) { 
            	if (!gameRunning) {
                    	startGame();
            	}
    	}
};
Key.addListener(keyListener);

Mouse.addListener(mouseListener);
 function startGame() {
    	x = int(gameWidth/2);
    	y = gameHeight-2;	 

    	xVelocity = [-1, 0, 1, 0];
    	yVelocity = [0, -1, 0, 1];

    	map = new Array();
    	for (var n=0;n<gameWidth;n++) {
            	map[n] = new Array();
    	}

    	turnQueue = new Array();
    	game.createEmptyMovieClip("s", 2);

    	tronBlockCounter = 0;
    	currentDirection = 1;

    	game.onEnterFrame = main;
    	gameRunning = true;
}

function gameOver() {
    	delete game.onEnterFrame;
    	gameRunning = false;
}

function main() {
    	if (turnQueue.length > 0) {
            	var dir = turnQueue.pop();
            	if (dir % 2 != currentDirection % 2) {
                    	currentDirection = dir;
            	}
    	}
    	x += xVelocity[currentDirection];
    	y += yVelocity[currentDirection];

    	if (map[x][y] != TRON_BLOCK && x > -1 && x < gameWidth && y > -1 && y < gameHeight) {
            	game.s.attachMovie("tronMC", tronBlockCounter, tronBlockCounter, {_x: x*blockSize, _y: y*blockSize});
            	tronBlockCounter++;
            	map[x][y] = TRON_BLOCK;
    	} else {
            	gameOver();
    	}
}