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ZolmeisterZolmeister
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core logic with tests
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‎.gitignore

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node_modules/

‎board.js

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function Board(grid) {
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this.grid = grid || _.map(Array(4), function() {
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return _.map(Array(4), function() {
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return 0
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})
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})
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this.spawn = function() {
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// get random empty grid cell
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var emptyCells = []
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for(var r=0;r<this.grid.length;r++) {
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for(var c=0;c<this.grid[0].length;c++) {
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if(!this.grid[r][c]) {
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emptyCells.push([r,c])
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}
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}
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}
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if(emptyCells.length === 0) {
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return this.endGame()
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}
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var target = _.sample(emptyCells)
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// fill with either the first or second colors
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var color = 1 //Math.random() > .9 ? 2 : 1;
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this.grid[target[0]][target[1]] = color
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// add element to DOM
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}
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this.endGame = function() {
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// show end game screen
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alert('game over')
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}
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this.move = function(dir) {
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this._move(dir)
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this.spawn()
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}
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this._move = function(dir) {
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var keymap = {
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up: [-1, 0],
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down: [1, 0],
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left: [0, -1],
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right: [0, 1]
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}
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var grid = this.grid
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var diff = keymap[dir]
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var rows = _.range(0, 4)
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var cols = _.range(0, 4)
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if(dir === 'down') {
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rows.reverse()
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}
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if(dir === 'right') {
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cols.reverse()
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}
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// Hack, is something has been combined, it has 0.1 added to it temporarily
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for(var r=0;r<rows.length;r++) {
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for(var c=0;c<cols.length;c++) {
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var row = rows[r]
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var col = cols[c]
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if (grid[row] && grid[row][col]) {
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while (grid[row + diff[0]] && (grid[row + diff[0]][col + diff[1]] === 0 ||
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grid[row][col] === grid[row + diff[0]][col + diff[1]])) {
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var combine = grid[row][col]
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if (grid[row][col] === grid[row + diff[0]][col + diff[1]]) {
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combine = grid[row][col] + 1.1
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}
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grid[row][col] = 0
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row += diff[0]
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col += diff[1]
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grid[row][col] = combine
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}
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}
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}
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}
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this.grid = _.map(grid, function(row) {
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return _.map(row, Math.floor.bind(Math))
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})
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}
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}
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if(typeof module !== 'undefined') {
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module.exports = Board
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}

‎index.html

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‎main.js

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var $ = document.querySelectorAll.bind(document);
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var GAME = {
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board: new Board()
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}
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// keybindings
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Hammer($('.grid')[0]).on("swipeleft", function(e) {
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GAME.board.move('left')
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}).on("swiperight", function(e) {
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GAME.board.move('right')
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}).on("swipeup", function(e) {
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GAME.board.move('up')
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}).on("swipedown", function(e) {
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GAME.board.move('down')
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});
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Mousetrap.bind(['up', 'down', 'left', 'right'], function(e) {
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GAME.board.move(e.keyIdentifier.toLowerCase())
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});
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‎package.json

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{
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"name": "prism",
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"version": "0.0.0",
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"directories": {
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"test": "test"
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},
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"scripts": {
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"test": "mocha"
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},
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"repository": {
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"type": "git",
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"url": "git://github.com/Zolmeister/prism.git"
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},
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"devDependencies": {
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"lodash": "~2.4.1"
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}
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}

‎test/main.js

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var assert = require("assert")
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_ = require('lodash')
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var Board = require('./../board')
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var board;
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function stringify(board) {
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return JSON.stringify(board.grid)
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}
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function flat(board) {
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return JSON.stringify(_.filter(_.flatten(board.grid)))
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}
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function pretty(board) {
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console.log()
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for(var r=0;r<board.grid.length;r++) {
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console.log(JSON.stringify(board.grid[r]))
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}
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console.log()
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}
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describe('Game Board', function () {
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describe('init()', function () {
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it('should create a 4x4 grid', function() {
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board = new Board()
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assert.strictEqual(board.grid.length, 4)
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assert.strictEqual(board.grid[0].length, 4)
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})
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})
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describe('spawn()', function () {
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it('should spawn a value in a random location', function () {
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assert.strictEqual(flat(board), '[]')
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board.spawn()
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assert.strictEqual(flat(board), '[1]')
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board.spawn()
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assert.strictEqual(flat(board), '[1,1]')
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})
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})
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describe('move() - simple', function() {
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var board;
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beforeEach(function() {
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board = new Board([
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 1, 0],
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[0, 0, 0, 0]
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])
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})
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it('should move right', function() {
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board._move('right')
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assert.strictEqual(stringify(board), JSON.stringify([
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 0, 1],
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[0, 0, 0, 0]
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]))
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})
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it('should move left', function() {
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board._move('left')
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assert.strictEqual(stringify(board), JSON.stringify([
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[1, 0, 0, 0],
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[0, 0, 0, 0]
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]))
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})
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it('should move up', function() {
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board._move('up')
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assert.strictEqual(stringify(board), JSON.stringify([
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[0, 0, 1, 0],
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 0, 0]
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]))
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})
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it('should move down', function() {
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board._move('down')
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assert.strictEqual(stringify(board), JSON.stringify([
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 1, 0]
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]))
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})
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})
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describe('move() - advanced', function() {
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it('should apply right one', function() {
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var board = new Board([
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 1, 1],
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[0, 0, 0, 0]
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])
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board._move('right')
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assert.strictEqual(stringify(board), JSON.stringify([
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 0, 2],
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[0, 0, 0, 0]
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]))
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})
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it('should not apply right one', function() {
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var board = new Board([
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 1, 2],
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[0, 0, 0, 0]
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])
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board._move('right')
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assert.strictEqual(stringify(board), JSON.stringify([
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 1, 2],
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[0, 0, 0, 0]
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]))
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})
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it('should apply three right two', function() {
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var board = new Board([
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[0, 0, 0, 0],
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[0, 0, 2, 2],
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[0, 1, 1, 0],
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[0, 3, 0, 3]
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])
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board._move('right')
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assert.strictEqual(stringify(board), JSON.stringify([
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[0, 0, 0, 0],
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[0, 0, 0, 3],
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[0, 0, 0, 2],
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[0, 0, 0, 4]
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]))
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})
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it('should apply up two', function() {
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var board = new Board([
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[0, 1, 0, 0],
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[0, 2, 2, 2],
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[4, 2, 1, 0],
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[4, 3, 0, 3]
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])
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board._move('up')
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assert.strictEqual(stringify(board), JSON.stringify([
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[5, 1, 2, 2],
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[0, 3, 1, 3],
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[0, 3, 0, 0],
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[0, 0, 0, 0]
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]))
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})
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it('should apply down two', function() {
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var board = new Board([
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[0, 1, 0, 0],
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[0, 2, 2, 2],
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[0, 2, 1, 0],
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[0, 3, 0, 3]
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])
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board._move('down')
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assert.strictEqual(stringify(board), JSON.stringify([
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[0, 0, 0, 0],
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[0, 1, 0, 0],
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[0, 3, 2, 2],
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[0, 3, 1, 3]
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]))
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})
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})
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})

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