Play 2048 Game Online

document.addEventListener("DOMContentLoaded", function () { // Wait till the browser is ready to render the game (avoids glitches) window.requestAnimationFrame(function () { var manager = new GameManager(4, KeyboardInputManager, HTMLActuator); }); }); function GameManager(size, InputManager, Actuator) { this.size = size; // Size of the grid this.inputManager = new InputManager; this.actuator = new Actuator; this.startTiles = 2; this.inputManager.on("move", this.move.bind(this)); this.inputManager.on("restart", this.restart.bind(this)); this.setup(); } // Restart the game GameManager.prototype.restart = function () { this.actuator.restart(); this.setup(); }; // Set up the game GameManager.prototype.setup = function () { this.grid = new Grid(this.size); this.score = 0; this.over = false; this.won = 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 () { this.actuator.actuate(this.grid, { score: this.score, over: this.over, won: this.won }); }; // 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.over || this.won) 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) { } 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; }; function Grid(size) { this.size = size; this.cells = []; this.build(); } // Build a grid of the specified size Grid.prototype.build = function () { for (var x = 0; x < this.size; x++) { var row = this.cells[x] = []; for (var y = 0; y < this.size; y++) { row.push(null); } } }; // 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; }; function HTMLActuator() { this.tileContainer = document.getElementsByClassName("tile-container")[0]; this.scoreContainer = document.getElementsByClassName("score-container")[0]; this.messageContainer = document.getElementsByClassName("game-message")[0]; 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); if (metadata.over) self.message(false); // You lose if (metadata.won) self.message(true); // You win! }); }; HTMLActuator.prototype.restart = function () { this.clearMessage(); }; HTMLActuator.prototype.clearContainer = function (container) { while (container.firstChild) { container.removeChild(container.firstChild); } }; HTMLActuator.prototype.addTile = function (tile) { var self = this; var element = document.createElement("div"); var position = tile.previousPosition || { x: tile.x, y: tile.y }; positionClass = this.positionClass(position); // We can't use classlist because it somehow glitches when replacing classes var classes = ["tile", "tile-" + tile.value, positionClass]; this.applyClasses(element, classes); element.textContent = 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(element, classes); // Update the position }); } else if (tile.mergedFrom) { classes.push("tile-merged"); this.applyClasses(element, classes); // Render the tiles that merged tile.mergedFrom.forEach(function (merged) { self.addTile(merged); }); } else { classes.push("tile-new"); this.applyClasses(element, classes); } // Put the tile on the board this.tileContainer.appendChild(element); }; 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.message = function (won) { var type = won ? "game-won" : "game-over"; var message = won ? "You win!" : "Game over!" // if (ga) ga("send", "event", "game", "end", type, this.score); this.messageContainer.classList.add(type); this.messageContainer.getElementsByTagName("p")[0].textContent = message; }; HTMLActuator.prototype.clearMessage = function () { this.messageContainer.classList.remove("game-won", "game-over"); }; function KeyboardInputManager() { this.events = {}; 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 keybindings 76: 1, 74: 2, 72: 3 }; document.addEventListener("keydown", function (event) { var modifiers = event.altKey || event.ctrlKey || event.metaKey || event.shiftKey; var mapped = map[event.which]; if (!modifiers) { if (mapped !== undefined) { event.preventDefault(); self.emit("move", mapped); } if (event.which === 32) self.restart.bind(self)(event); } }); var retry = document.getElementsByClassName("retry-button")[0]; retry.addEventListener("click", this.restart.bind(this)); // Listen to swipe events var gestures = [Hammer.DIRECTION_UP, Hammer.DIRECTION_RIGHT, Hammer.DIRECTION_DOWN, Hammer.DIRECTION_LEFT]; var gameContainer = document.getElementsByClassName("game-container")[0]; var handler = Hammer(gameContainer, { drag_block_horizontal: true, drag_block_vertical: true }); handler.on("swipe", function (event) { event.gesture.preventDefault(); mapped = gestures.indexOf(event.gesture.direction); if (mapped !== -1) self.emit("move", mapped); }); }; KeyboardInputManager.prototype.restart = function (event) { event.preventDefault(); this.emit("restart"); }; 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; };