Function.prototype.bind = Function.prototype.bind || function (target) {
var self = this;
return function (args) {
if (!(args instanceof Array)) {
args = [args];
}
self.apply(target, args);
};
};
(function () {
if (typeof window.Element === "undefined" ||
"classList" in document.documentElement) {
return;
}
var prototype = Array.prototype,
push = prototype.push,
splice = prototype.splice,
join = prototype.join;
function DOMTokenList(el) {
this.el = el;
// The className needs to be trimmed and split on whitespace
// to retrieve a list of classes.
var classes = el.className.replace(/^\s+|\s+$/g, '').split(/\s+/);
for (var i = 0; i < classes.length; i++) {
push.call(this, classes[i]);
}
}
DOMTokenList.prototype = {
add: function (token) {
if (this.contains(token)) return;
push.call(this, token);
this.el.className = this.toString();
},
contains: function (token) {
return this.el.className.indexOf(token) != -1;
},
item: function (index) {
return this[index] || null;
},
remove: function (token) {
if (!this.contains(token)) return;
for (var i = 0; i < this.length; i++) {
if (this[i] == token) break;
}
splice.call(this, i, 1);
this.el.className = this.toString();
},
toString: function () {
return join.call(this, ' ');
},
toggle: function (token) {
if (!this.contains(token)) {
this.add(token);
} else {
this.remove(token);
}
return this.contains(token);
}
};
window.DOMTokenList = DOMTokenList;
function defineElementGetter(obj, prop, getter) {
if (Object.defineProperty) {
Object.defineProperty(obj, prop, {
get: getter
});
} else {
obj.__defineGetter__(prop, getter);
}
}
defineElementGetter(HTMLElement.prototype, 'classList', function () {
return new DOMTokenList(this);
});
})();
(function() {
var lastTime = 0;
var vendors = ['webkit', 'moz'];
for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
window.cancelAnimationFrame =
window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame) {
window.requestAnimationFrame = function(callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function() { callback(currTime + timeToCall); },
timeToCall);
lastTime = currTime + timeToCall;
return id;
};
}
if (!window.cancelAnimationFrame) {
window.cancelAnimationFrame = function(id) {
clearTimeout(id);
};
}
}());
function KeyboardInputManager() {
this.events = {};
if (window.navigator.msPointerEnabled) {
//Internet Explorer 10 style
this.eventTouchstart = "MSPointerDown";
this.eventTouchmove = "MSPointerMove";
this.eventTouchend = "MSPointerUp";
} else {
this.eventTouchstart = "touchstart";
this.eventTouchmove = "touchmove";
this.eventTouchend = "touchend";
}
this.listen();
}
KeyboardInputManager.prototype.on = function (event, callback) {
if (!this.events[event]) {
this.events[event] = [];
}
this.events[event].push(callback);
};
KeyboardInputManager.prototype.emit = function (event, data) {
var callbacks = this.events[event];
if (callbacks) {
callbacks.forEach(function (callback) {
callback(data);
});
}
};
KeyboardInputManager.prototype.listen = function () {
var self = this;
var map = {
38: 0, // Up
39: 1, // Right
40: 2, // Down
37: 3, // Left
75: 0, // Vim up
76: 1, // Vim right
74: 2, // Vim down
72: 3, // Vim left
87: 0, // W
68: 1, // D
83: 2, // S
65: 3 // A
};
// Respond to direction keys
document.addEventListener("keydown", function (event) {
var modifiers = event.altKey || event.ctrlKey || event.metaKey ||
event.shiftKey;
var mapped = map[event.which];
// Ignore the event if it's happening in a text field
if (self.targetIsInput(event)) return;
if (!modifiers) {
if (mapped !== undefined) {
event.preventDefault();
self.emit("move", mapped);
}
}
// R key restarts the game
if (!modifiers && event.which === 82) {
self.restart.call(self, event);
}
});
// Respond to button presses
this.bindButtonPress(".retry-button", this.restart);
this.bindButtonPress(".restart-button", this.restart);
this.bindButtonPress(".keep-playing-button", this.keepPlaying);
// Respond to swipe events
var touchStartClientX, touchStartClientY;
var gameContainer = document.getElementsByClassName("game-container")[0];
gameContainer.addEventListener(this.eventTouchstart, function (event) {
if ((!window.navigator.msPointerEnabled && event.touches.length > 1) ||
event.targetTouches > 1 ||
self.targetIsInput(event)) {
return; // Ignore if touching with more than 1 finger or touching input
}
if (window.navigator.msPointerEnabled) {
touchStartClientX = event.pageX;
touchStartClientY = event.pageY;
} else {
touchStartClientX = event.touches[0].clientX;
touchStartClientY = event.touches[0].clientY;
}
event.preventDefault();
});
gameContainer.addEventListener(this.eventTouchmove, function (event) {
event.preventDefault();
});
gameContainer.addEventListener(this.eventTouchend, function (event) {
if ((!window.navigator.msPointerEnabled && event.touches.length > 0) ||
event.targetTouches > 0 ||
self.targetIsInput(event)) {
return; // Ignore if still touching with one or more fingers or input
}
var touchEndClientX, touchEndClientY;
if (window.navigator.msPointerEnabled) {
touchEndClientX = event.pageX;
touchEndClientY = event.pageY;
} else {
touchEndClientX = event.changedTouches[0].clientX;
touchEndClientY = event.changedTouches[0].clientY;
}
var dx = touchEndClientX - touchStartClientX;
var absDx = Math.abs(dx);
var dy = touchEndClientY - touchStartClientY;
var absDy = Math.abs(dy);
if (Math.max(absDx, absDy) > 10) {
// (right : left) : (down : up)
self.emit("move", absDx > absDy ? (dx > 0 ? 1 : 3) : (dy > 0 ? 2 : 0));
}
});
};
KeyboardInputManager.prototype.restart = function (event) {
event.preventDefault();
this.emit("restart");
};
KeyboardInputManager.prototype.keepPlaying = function (event) {
event.preventDefault();
this.emit("keepPlaying");
};
KeyboardInputManager.prototype.bindButtonPress = function (selector, fn) {
var button = document.querySelector(selector);
button.addEventListener("click", fn.bind(this));
button.addEventListener(this.eventTouchend, fn.bind(this));
};
KeyboardInputManager.prototype.targetIsInput = function (event) {
return event.target.tagName.toLowerCase() === "input";
};
function HTMLActuator() {
this.tileContainer = document.querySelector(".tile-container");
this.scoreContainer = document.querySelector(".score-container");
this.bestContainer = document.querySelector(".best-container");
this.messageContainer = document.querySelector(".game-message");
this.sharingContainer = document.querySelector(".score-sharing");
this.score = 0;
}
HTMLActuator.prototype.actuate = function (grid, metadata) {
var self = this;
window.requestAnimationFrame(function () {
self.clearContainer(self.tileContainer);
grid.cells.forEach(function (column) {
column.forEach(function (cell) {
if (cell) {
self.addTile(cell);
}
});
});
self.updateScore(metadata.score);
self.updateBestScore(metadata.bestScore);
if (metadata.terminated) {
if (metadata.over) {
self.message(false); // You lose
} else if (metadata.won) {
self.message(true); // You win!
}
}
});
};
// Continues the game (both restart and keep playing)
HTMLActuator.prototype.continueGame = function () {
if (typeof ga !== "undefined") {
ga("send", "event", "game", "restart");
}
this.clearMessage();
};
HTMLActuator.prototype.clearContainer = function (container) {
while (container.firstChild) {
container.removeChild(container.firstChild);
}
};
//HTMLActuator.prototype.tileHTML = ["菜鸟", "入门", "码畜", "码奴", "码农", "IT民工", "IT工程师", "IT人才", "IT精英", "IT大哥", "IT领袖"];
//HTMLActuator.prototype.tileHTML = ["2", "4", "8", "16", "32", "64", "128", "256", "512", "1024", "2048"];
//HTMLActuator.prototype.tileHTML = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "win"];
HTMLActuator.prototype.tileHTML = ["2", "4", "8", "16", "32", "64", "128", "256", "512", "1024", "2048"];
HTMLActuator.prototype.addTile = function (tile) {
var self = this;
var wrapper = document.createElement("div");
var inner = document.createElement("div");
var position = tile.previousPosition || { x: tile.x, y: tile.y };
var positionClass = this.positionClass(position);
// We can't use classlist because it somehow glitches when replacing classes
var classes = ["tile", "tile-" + tile.value, positionClass];
if (tile.value > 2048) classes.push("tile-super");
this.applyClasses(wrapper, classes);
inner.classList.add("tile-inner");
inner.textContent = HTMLActuator.prototype.tileHTML[Math.log(tile.value) / Math.LN2 - 1] || tile.value;
if (tile.previousPosition) {
// Make sure that the tile gets rendered in the previous position first
window.requestAnimationFrame(function () {
classes[2] = self.positionClass({ x: tile.x, y: tile.y });
self.applyClasses(wrapper, classes); // Update the position
});
} else if (tile.mergedFrom) {
classes.push("tile-merged");
this.applyClasses(wrapper, classes);
// Render the tiles that merged
tile.mergedFrom.forEach(function (merged) {
self.addTile(merged);
});
} else {
classes.push("tile-new");
this.applyClasses(wrapper, classes);
}
// Add the inner part of the tile to the wrapper
wrapper.appendChild(inner);
// Put the tile on the board
this.tileContainer.appendChild(wrapper);
};
HTMLActuator.prototype.applyClasses = function (element, classes) {
element.setAttribute("class", classes.join(" "));
};
HTMLActuator.prototype.normalizePosition = function (position) {
return { x: position.x + 1, y: position.y + 1 };
};
HTMLActuator.prototype.positionClass = function (position) {
position = this.normalizePosition(position);
return "tile-position-" + position.x + "-" + position.y;
};
HTMLActuator.prototype.updateScore = function (score) {
this.clearContainer(this.scoreContainer);
var difference = score - this.score;
this.score = score;
this.scoreContainer.textContent = this.score;
if (difference > 0) {
var addition = document.createElement("div");
addition.classList.add("score-addition");
addition.textContent = "+" + difference;
this.scoreContainer.appendChild(addition);
}
};
HTMLActuator.prototype.updateBestScore = function (bestScore) {
this.bestContainer.textContent = bestScore;
};
HTMLActuator.prototype.message = function (won) {
var type = won ? "game-won" : "game-over";
var message = won ? "You win!" : "Game over!";
if (typeof ga !== "undefined") {
ga("send", "event", "game", "end", type, this.score);
}
this.messageContainer.classList.add(type);
this.messageContainer.getElementsByTagName("p")[0].textContent = message;
this.clearContainer(this.sharingContainer);
this.sharingContainer.appendChild(this.scoreTweetButton());
//twttr.widgets.load();
};
HTMLActuator.prototype.clearMessage = function () {
// IE only takes one value to remove at a time.
this.messageContainer.classList.remove("game-won");
this.messageContainer.classList.remove("game-over");
};
HTMLActuator.prototype.scoreTweetButton = function () {
var tweet = document.createElement("a");
tweet.classList.add("twitter-share-button");
tweet.setAttribute("href", "https://twitter.com/share");
tweet.setAttribute("data-via", "gabrielecirulli");
tweet.setAttribute("data-url", "http://git.io/2048");
tweet.setAttribute("data-counturl", "http://gabrielecirulli.github.io/2048/");
tweet.textContent = "Tweet";
var text = "I scored " + this.score + " points at 2048, a game where you " +
"join numbers to score high! #2048game";
tweet.setAttribute("data-text", text);
return tweet;
};
function Grid(size, previousState) {
this.size = size;
this.cells = previousState ? this.fromState(previousState) : this.empty();
}
// Build a grid of the specified size
Grid.prototype.empty = function () {
var cells = [];
for (var x = 0; x < this.size; x++) {
var row = cells[x] = [];
for (var y = 0; y < this.size; y++) {
row.push(null);
}
}
return cells;
};
Grid.prototype.fromState = function (state) {
var cells = [];
for (var x = 0; x < this.size; x++) {
var row = cells[x] = [];
for (var y = 0; y < this.size; y++) {
var tile = state[x][y];
row.push(tile ? new Tile(tile.position, tile.value) : null);
}
}
return cells;
};
// Find the first available random position
Grid.prototype.randomAvailableCell = function () {
var cells = this.availableCells();
if (cells.length) {
return cells[Math.floor(Math.random() * cells.length)];
}
};
Grid.prototype.availableCells = function () {
var cells = [];
this.eachCell(function (x, y, tile) {
if (!tile) {
cells.push({ x: x, y: y });
}
});
return cells;
};
// Call callback for every cell
Grid.prototype.eachCell = function (callback) {
for (var x = 0; x < this.size; x++) {
for (var y = 0; y < this.size; y++) {
callback(x, y, this.cells[x][y]);
}
}
};
// Check if there are any cells available
Grid.prototype.cellsAvailable = function () {
return !!this.availableCells().length;
};
// Check if the specified cell is taken
Grid.prototype.cellAvailable = function (cell) {
return !this.cellOccupied(cell);
};
Grid.prototype.cellOccupied = function (cell) {
return !!this.cellContent(cell);
};
Grid.prototype.cellContent = function (cell) {
if (this.withinBounds(cell)) {
return this.cells[cell.x][cell.y];
} else {
return null;
}
};
// Inserts a tile at its position
Grid.prototype.insertTile = function (tile) {
this.cells[tile.x][tile.y] = tile;
};
Grid.prototype.removeTile = function (tile) {
this.cells[tile.x][tile.y] = null;
};
Grid.prototype.withinBounds = function (position) {
return position.x >= 0 && position.x < this.size &&
position.y >= 0 && position.y < this.size;
};
Grid.prototype.serialize = function () {
var cellState = [];
for (var x = 0; x < this.size; x++) {
var row = cellState[x] = [];
for (var y = 0; y < this.size; y++) {
row.push(this.cells[x][y] ? this.cells[x][y].serialize() : null);
}
}
return {
size: this.size,
cells: cellState
};
};
function Tile(position, value) {
this.x = position.x;
this.y = position.y;
this.value = value || 2;
this.previousPosition = null;
this.mergedFrom = null; // Tracks tiles that merged together
}
Tile.prototype.savePosition = function () {
this.previousPosition = { x: this.x, y: this.y };
};
Tile.prototype.updatePosition = function (position) {
this.x = position.x;
this.y = position.y;
};
Tile.prototype.serialize = function () {
return {
position: {
x: this.x,
y: this.y
},
value: this.value
};
};
window.fakeStorage = {
_data: {},
setItem: function (id, val) {
return this._data[id] = String(val);
},
getItem: function (id) {
return this._data.hasOwnProperty(id) ? this._data[id] : undefined;
},
removeItem: function (id) {
return delete this._data[id];
},
clear: function () {
return this._data = {};
}
};
function LocalStorageManager() {
this.bestScoreKey = "bestScore";
this.gameStateKey = "gameState";
var supported = this.localStorageSupported();
this.storage = supported ? window.localStorage : window.fakeStorage;
}
LocalStorageManager.prototype.localStorageSupported = function () {
var testKey = "test";
var storage = window.localStorage;
try {
storage.setItem(testKey, "1");
storage.removeItem(testKey);
return true;
} catch (error) {
return false;
}
};
// Best score getters/setters
LocalStorageManager.prototype.getBestScore = function () {
return this.storage.getItem(this.bestScoreKey) || 0;
};
LocalStorageManager.prototype.setBestScore = function (score) {
this.storage.setItem(this.bestScoreKey, score);
};
// Game state getters/setters and clearing
LocalStorageManager.prototype.getGameState = function () {
var stateJSON = this.storage.getItem(this.gameStateKey);
return stateJSON ? JSON.parse(stateJSON) : null;
};
LocalStorageManager.prototype.setGameState = function (gameState) {
this.storage.setItem(this.gameStateKey, JSON.stringify(gameState));
};
LocalStorageManager.prototype.clearGameState = function () {
this.storage.removeItem(this.gameStateKey);
};
function GameManager(size, InputManager, Actuator, StorageManager) {
this.size = size; // Size of the grid
this.inputManager = new InputManager;
this.storageManager = new StorageManager;
this.actuator = new Actuator;
this.startTiles = 2;
this.inputManager.on("move", this.move.bind(this));
this.inputManager.on("restart", this.restart.bind(this));
this.inputManager.on("keepPlaying", this.keepPlaying.bind(this));
this.setup();
}
// Restart the game
GameManager.prototype.restart = function () {
this.storageManager.clearGameState();
this.actuator.continueGame(); // Clear the game won/lost message
this.setup();
};
// Keep playing after winning (allows going over 2048)
GameManager.prototype.keepPlaying = function () {
this.keepPlaying = true;
this.actuator.continueGame(); // Clear the game won/lost message
};
// Return true if the game is lost, or has won and the user hasn't kept playing
GameManager.prototype.isGameTerminated = function () {
if (this.over || (this.won && !this.keepPlaying)) {
return true;
} else {
return false;
}
};
// Set up the game
GameManager.prototype.setup = function () {
var previousState = this.storageManager.getGameState();
// Reload the game from a previous game if present
if (previousState) {
this.grid = new Grid(previousState.grid.size,
previousState.grid.cells); // Reload grid
this.score = previousState.score;
this.over = previousState.over;
this.won = previousState.won;
this.keepPlaying = previousState.keepPlaying;
} else {
this.grid = new Grid(this.size);
this.score = 0;
this.over = false;
this.won = false;
this.keepPlaying = false;
// Add the initial tiles
this.addStartTiles();
}
// Update the actuator
this.actuate();
};
// Set up the initial tiles to start the game with
GameManager.prototype.addStartTiles = function () {
for (var i = 0; i < this.startTiles; i++) {
this.addRandomTile();
}
};
// Adds a tile in a random position
GameManager.prototype.addRandomTile = function () {
if (this.grid.cellsAvailable()) {
var value = Math.random() < 0.9 ? 2 : 4;
var tile = new Tile(this.grid.randomAvailableCell(), value);
this.grid.insertTile(tile);
}
};
// Sends the updated grid to the actuator
GameManager.prototype.actuate = function () {
if (this.storageManager.getBestScore() < this.score) {
this.storageManager.setBestScore(this.score);
}
// Clear the state when the game is over (game over only, not win)
if (this.over) {
this.storageManager.clearGameState();
} else {
this.storageManager.setGameState(this.serialize());
}
this.actuator.actuate(this.grid, {
score: this.score,
over: this.over,
won: this.won,
bestScore: this.storageManager.getBestScore(),
terminated: this.isGameTerminated()
});
};
// Represent the current game as an object
GameManager.prototype.serialize = function () {
return {
grid: this.grid.serialize(),
score: this.score,
over: this.over,
won: this.won,
keepPlaying: this.keepPlaying
};
};
// Save all tile positions and remove merger info
GameManager.prototype.prepareTiles = function () {
this.grid.eachCell(function (x, y, tile) {
if (tile) {
tile.mergedFrom = null;
tile.savePosition();
}
});
};
// Move a tile and its representation
GameManager.prototype.moveTile = function (tile, cell) {
this.grid.cells[tile.x][tile.y] = null;
this.grid.cells[cell.x][cell.y] = tile;
tile.updatePosition(cell);
};
// Move tiles on the grid in the specified direction
GameManager.prototype.move = function (direction) {
// 0: up, 1: right, 2: down, 3: left
var self = this;
if (this.isGameTerminated()) return; // Don't do anything if the game's over
var cell, tile;
var vector = this.getVector(direction);
var traversals = this.buildTraversals(vector);
var moved = false;
// Save the current tile positions and remove merger information
this.prepareTiles();
// Traverse the grid in the right direction and move tiles
traversals.x.forEach(function (x) {
traversals.y.forEach(function (y) {
cell = { x: x, y: y };
tile = self.grid.cellContent(cell);
if (tile) {
var positions = self.findFarthestPosition(cell, vector);
var next = self.grid.cellContent(positions.next);
// Only one merger per row traversal?
if (next && next.value === tile.value && !next.mergedFrom) {
var merged = new Tile(positions.next, tile.value * 2);
merged.mergedFrom = [tile, next];
self.grid.insertTile(merged);
self.grid.removeTile(tile);
// Converge the two tiles' positions
tile.updatePosition(positions.next);
// Update the score
self.score += merged.value;
// The mighty 2048 tile
if (merged.value === 2048) self.won = true;
} else {
self.moveTile(tile, positions.farthest);
}
if (!self.positionsEqual(cell, tile)) {
moved = true; // The tile moved from its original cell!
}
}
});
});
if (moved) {
this.addRandomTile();
if (!this.movesAvailable()) {
this.over = true; // Game over!
}
this.actuate();
}
};
// Get the vector representing the chosen direction
GameManager.prototype.getVector = function (direction) {
// Vectors representing tile movement
var map = {
0: { x: 0, y: -1 }, // Up
1: { x: 1, y: 0 }, // Right
2: { x: 0, y: 1 }, // Down
3: { x: -1, y: 0 } // Left
};
return map[direction];
};
// Build a list of positions to traverse in the right order
GameManager.prototype.buildTraversals = function (vector) {
var traversals = { x: [], y: [] };
for (var pos = 0; pos < this.size; pos++) {
traversals.x.push(pos);
traversals.y.push(pos);
}
// Always traverse from the farthest cell in the chosen direction
if (vector.x === 1) traversals.x = traversals.x.reverse();
if (vector.y === 1) traversals.y = traversals.y.reverse();
return traversals;
};
GameManager.prototype.findFarthestPosition = function (cell, vector) {
var previous;
// Progress towards the vector direction until an obstacle is found
do {
previous = cell;
cell = { x: previous.x + vector.x, y: previous.y + vector.y };
} while (this.grid.withinBounds(cell) &&
this.grid.cellAvailable(cell));
return {
farthest: previous,
next: cell // Used to check if a merge is required
};
};
GameManager.prototype.movesAvailable = function () {
return this.grid.cellsAvailable() || this.tileMatchesAvailable();
};
// Check for available matches between tiles (more expensive check)
GameManager.prototype.tileMatchesAvailable = function () {
var self = this;
var tile;
for (var x = 0; x < this.size; x++) {
for (var y = 0; y < this.size; y++) {
tile = this.grid.cellContent({ x: x, y: y });
if (tile) {
for (var direction = 0; direction < 4; direction++) {
var vector = self.getVector(direction);
var cell = { x: x + vector.x, y: y + vector.y };
var other = self.grid.cellContent(cell);
if (other && other.value === tile.value) {
return true; // These two tiles can be merged
}
}
}
}
}
return false;
};
GameManager.prototype.positionsEqual = function (first, second) {
return first.x === second.x && first.y === second.y;
};
// Wait till the browser is ready to render the game (avoids glitches)
window.requestAnimationFrame(function () {
new GameManager(4, KeyboardInputManager, HTMLActuator, LocalStorageManager);
});