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function game2048(container)
{
this.container = container;
this.tiles = new Array(16);
}
game2048.prototype = {
init: function(){
for(var i = 0, len = this.tiles.length; i < len; i++){
var tile = this.newTile(0);
tile.setAttribute('index', i);
this.container.appendChild(tile);
this.tiles[i] = tile;
}
this.randomTile();
this.randomTile();
},
newTile: function(val){
var tile = document.createElement('div');
this.setTileVal(tile, val)
return tile;
},
setTileVal: function(tile, val){
tile.className = 'tile tile' + val;
tile.setAttribute('val', val);
tile.innerHTML = val > 0 ? val : '';
},
randomTile: function(){
var zeroTiles = [];
for(var i = 0, len = this.tiles.length; i < len; i++){
if(this.tiles[i].getAttribute('val') == 0){
zeroTiles.push(this.tiles[i]);
}
}
var rTile = zeroTiles[Math.floor(Math.random() * zeroTiles.length)];
this.setTileVal(rTile, Math.random() < 0.8 ? 2 : 4);
},
move:function(direction){
var j;
switch(direction){
case 'W':
for(var i = 4, len = this.tiles.length; i < len; i++){
j = i;
while(j >= 4){
this.merge(this.tiles[j - 4], this.tiles[j]);
j -= 4;
}
}
break;
case 'S':
for(var i = 11; i >= 0; i--){
j = i;
while(j <= 11){
this.merge(this.tiles[j + 4], this.tiles[j]);
j += 4;
}
}
break;
case 'A':
for(var i = 1, len = this.tiles.length; i < len; i++){
j = i;
while(j % 4 != 0){
this.merge(this.tiles[j - 1], this.tiles[j]);
j -= 1;
}
}
break;
case 'D':
for(var i = 14; i >= 0; i--){
j = i;
while(j % 4 != 3){
this.merge(this.tiles[j + 1], this.tiles[j]);
j += 1;
}
}
break;
}
this.randomTile();
},
merge: function(prevTile, currTile){
var prevVal = prevTile.getAttribute('val');
var currVal = currTile.getAttribute('val');
if(currVal != 0){
if(prevVal == 0){
this.setTileVal(prevTile, currVal);
this.setTileVal(currTile, 0);
}
else if(prevVal == currVal){
this.setTileVal(prevTile, prevVal * 2);
this.setTileVal(currTile, 0);
}
}
},
equal: function(tile1, tile2){
return tile1.getAttribute('val') == tile2.getAttribute('val');
},
max: function(){
for(var i = 0, len = this.tiles.length; i < len; i++){
if(this.tiles[i].getAttribute('val') == 2048){
return true;
}
}
},
over: function(){
for(var i = 0, len = this.tiles.length; i < len; i++){
if(this.tiles[i].getAttribute('val') == 0){
return false;
}
if(i % 4 != 3){
if(this.equal(this.tiles[i], this.tiles[i + 1])){
return false;
}
}
if(i < 12){
if(this.equal(this.tiles[i], this.tiles[i + 4])){
return false;
}
}
}
return true;
},
clean: function(){
for(var i = 0, len = this.tiles.length; i < len; i++){
this.container.removeChild(this.tiles[i]);
}
this.tiles = new Array(16);
}
}
var game, startBtn;
window.onload = function(){
var container = document.getElementById('div2048');
startBtn = document.getElementById('start');
startBtn.onclick = function(){
this.style.display = 'none';
game = game || new game2048(container);
game.init();
}
}
window.onkeydown = function(e){
var keynum, keychar;
if(window.event){ // IE
keynum = e.keyCode;
}
else if(e.which){ // Netscape/Firefox/Opera
keynum = e.which;
}
keychar = String.fromCharCode(keynum);
if(['W', 'S', 'A', 'D'].indexOf(keychar) > -1){
if(game.over()){
game.clean();
startBtn.style.display = 'block';
startBtn.innerHTML = 'game over, replay?';
return;
}
game.move(keychar);
}
}
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