├── .gitignore ├── README.md ├── frontend ├── index.html └── index.js └── server ├── constants.js ├── game.js ├── package.json ├── server.js ├── utils.js └── yarn.lock /.gitignore: -------------------------------------------------------------------------------- 1 | # Logs 2 | logs 3 | *.log 4 | npm-debug.log* 5 | yarn-debug.log* 6 | yarn-error.log* 7 | lerna-debug.log* 8 | 9 | # Diagnostic reports (https://nodejs.org/api/report.html) 10 | report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json 11 | 12 | # Runtime data 13 | pids 14 | *.pid 15 | *.seed 16 | *.pid.lock 17 | 18 | # Directory for instrumented libs generated by jscoverage/JSCover 19 | lib-cov 20 | 21 | # Coverage directory used by tools like istanbul 22 | coverage 23 | *.lcov 24 | 25 | # nyc test coverage 26 | .nyc_output 27 | 28 | # Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) 29 | .grunt 30 | 31 | # Bower dependency directory (https://bower.io/) 32 | bower_components 33 | 34 | # node-waf configuration 35 | .lock-wscript 36 | 37 | # Compiled binary addons (https://nodejs.org/api/addons.html) 38 | build/Release 39 | 40 | # Dependency directories 41 | node_modules/ 42 | jspm_packages/ 43 | 44 | # Snowpack dependency directory (https://snowpack.dev/) 45 | web_modules/ 46 | 47 | # TypeScript cache 48 | *.tsbuildinfo 49 | 50 | # Optional npm cache directory 51 | .npm 52 | 53 | # Optional eslint cache 54 | .eslintcache 55 | 56 | # Microbundle cache 57 | .rpt2_cache/ 58 | .rts2_cache_cjs/ 59 | .rts2_cache_es/ 60 | .rts2_cache_umd/ 61 | 62 | # Optional REPL history 63 | .node_repl_history 64 | 65 | # Output of 'npm pack' 66 | *.tgz 67 | 68 | # Yarn Integrity file 69 | .yarn-integrity 70 | 71 | # dotenv environment variables file 72 | .env 73 | .env.test 74 | 75 | # parcel-bundler cache (https://parceljs.org/) 76 | .cache 77 | .parcel-cache 78 | 79 | # Next.js build output 80 | .next 81 | out 82 | 83 | # Nuxt.js build / generate output 84 | .nuxt 85 | dist 86 | 87 | # Gatsby files 88 | .cache/ 89 | # Comment in the public line in if your project uses Gatsby and not Next.js 90 | # https://nextjs.org/blog/next-9-1#public-directory-support 91 | # public 92 | 93 | # vuepress build output 94 | .vuepress/dist 95 | 96 | # Serverless directories 97 | .serverless/ 98 | 99 | # FuseBox cache 100 | .fusebox/ 101 | 102 | # DynamoDB Local files 103 | .dynamodb/ 104 | 105 | # TernJS port file 106 | .tern-port 107 | 108 | # Stores VSCode versions used for testing VSCode extensions 109 | .vscode-test 110 | 111 | # yarn v2 112 | .yarn/cache 113 | .yarn/unplugged 114 | .yarn/build-state.yml 115 | .yarn/install-state.gz 116 | .pnp.* 117 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # multiplayerSnake 2 | Code for multiplayer snake game with [socket.io tutorial](https://www.youtube.com/watch?v=ppcBIHv_ZPs) on the Traversy Media YouTube channel. 3 | 4 | If you want to see how to deploy the game check out [this video](https://www.youtube.com/watch?v=M9RDYkFs-EQ) 5 | -------------------------------------------------------------------------------- /frontend/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | MultiPlayer Snake 6 | 7 | 8 | 13 | 14 | 15 |

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Multiplayer Snake

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Your game code is:

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53 | 54 | 55 | 56 | 57 | 58 | -------------------------------------------------------------------------------- /frontend/index.js: -------------------------------------------------------------------------------- 1 | const BG_COLOUR = '#231f20'; 2 | const SNAKE_COLOUR = '#c2c2c2'; 3 | const FOOD_COLOUR = '#e66916'; 4 | 5 | const socket = io('https://sleepy-island-33889.herokuapp.com/'); 6 | 7 | socket.on('init', handleInit); 8 | socket.on('gameState', handleGameState); 9 | socket.on('gameOver', handleGameOver); 10 | socket.on('gameCode', handleGameCode); 11 | socket.on('unknownCode', handleUnknownCode); 12 | socket.on('tooManyPlayers', handleTooManyPlayers); 13 | 14 | const gameScreen = document.getElementById('gameScreen'); 15 | const initialScreen = document.getElementById('initialScreen'); 16 | const newGameBtn = document.getElementById('newGameButton'); 17 | const joinGameBtn = document.getElementById('joinGameButton'); 18 | const gameCodeInput = document.getElementById('gameCodeInput'); 19 | const gameCodeDisplay = document.getElementById('gameCodeDisplay'); 20 | 21 | newGameBtn.addEventListener('click', newGame); 22 | joinGameBtn.addEventListener('click', joinGame); 23 | 24 | 25 | function newGame() { 26 | socket.emit('newGame'); 27 | init(); 28 | } 29 | 30 | function joinGame() { 31 | const code = gameCodeInput.value; 32 | socket.emit('joinGame', code); 33 | init(); 34 | } 35 | 36 | let canvas, ctx; 37 | let playerNumber; 38 | let gameActive = false; 39 | 40 | function init() { 41 | initialScreen.style.display = "none"; 42 | gameScreen.style.display = "block"; 43 | 44 | canvas = document.getElementById('canvas'); 45 | ctx = canvas.getContext('2d'); 46 | 47 | canvas.width = canvas.height = 600; 48 | 49 | ctx.fillStyle = BG_COLOUR; 50 | ctx.fillRect(0, 0, canvas.width, canvas.height); 51 | 52 | document.addEventListener('keydown', keydown); 53 | gameActive = true; 54 | } 55 | 56 | function keydown(e) { 57 | socket.emit('keydown', e.keyCode); 58 | } 59 | 60 | function paintGame(state) { 61 | ctx.fillStyle = BG_COLOUR; 62 | ctx.fillRect(0, 0, canvas.width, canvas.height); 63 | 64 | const food = state.food; 65 | const gridsize = state.gridsize; 66 | const size = canvas.width / gridsize; 67 | 68 | ctx.fillStyle = FOOD_COLOUR; 69 | ctx.fillRect(food.x * size, food.y * size, size, size); 70 | 71 | paintPlayer(state.players[0], size, SNAKE_COLOUR); 72 | paintPlayer(state.players[1], size, 'red'); 73 | } 74 | 75 | function paintPlayer(playerState, size, colour) { 76 | const snake = playerState.snake; 77 | 78 | ctx.fillStyle = colour; 79 | for (let cell of snake) { 80 | ctx.fillRect(cell.x * size, cell.y * size, size, size); 81 | } 82 | } 83 | 84 | function handleInit(number) { 85 | playerNumber = number; 86 | } 87 | 88 | function handleGameState(gameState) { 89 | if (!gameActive) { 90 | return; 91 | } 92 | gameState = JSON.parse(gameState); 93 | requestAnimationFrame(() => paintGame(gameState)); 94 | } 95 | 96 | function handleGameOver(data) { 97 | if (!gameActive) { 98 | return; 99 | } 100 | data = JSON.parse(data); 101 | 102 | gameActive = false; 103 | 104 | if (data.winner === playerNumber) { 105 | alert('You Win!'); 106 | } else { 107 | alert('You Lose :('); 108 | } 109 | } 110 | 111 | function handleGameCode(gameCode) { 112 | gameCodeDisplay.innerText = gameCode; 113 | } 114 | 115 | function handleUnknownCode() { 116 | reset(); 117 | alert('Unknown Game Code') 118 | } 119 | 120 | function handleTooManyPlayers() { 121 | reset(); 122 | alert('This game is already in progress'); 123 | } 124 | 125 | function reset() { 126 | playerNumber = null; 127 | gameCodeInput.value = ''; 128 | initialScreen.style.display = "block"; 129 | gameScreen.style.display = "none"; 130 | } 131 | -------------------------------------------------------------------------------- /server/constants.js: -------------------------------------------------------------------------------- 1 | const FRAME_RATE = 10; 2 | const GRID_SIZE = 20; 3 | 4 | module.exports = { 5 | FRAME_RATE, 6 | GRID_SIZE, 7 | } 8 | -------------------------------------------------------------------------------- /server/game.js: -------------------------------------------------------------------------------- 1 | const { GRID_SIZE } = require('./constants'); 2 | 3 | module.exports = { 4 | initGame, 5 | gameLoop, 6 | getUpdatedVelocity, 7 | } 8 | 9 | function initGame() { 10 | const state = createGameState() 11 | randomFood(state); 12 | return state; 13 | } 14 | 15 | function createGameState() { 16 | return { 17 | players: [{ 18 | pos: { 19 | x: 3, 20 | y: 10, 21 | }, 22 | vel: { 23 | x: 1, 24 | y: 0, 25 | }, 26 | snake: [ 27 | {x: 1, y: 10}, 28 | {x: 2, y: 10}, 29 | {x: 3, y: 10}, 30 | ], 31 | }, { 32 | pos: { 33 | x: 18, 34 | y: 10, 35 | }, 36 | vel: { 37 | x: 0, 38 | y: 0, 39 | }, 40 | snake: [ 41 | {x: 20, y: 10}, 42 | {x: 19, y: 10}, 43 | {x: 18, y: 10}, 44 | ], 45 | }], 46 | food: {}, 47 | gridsize: GRID_SIZE, 48 | }; 49 | } 50 | 51 | function gameLoop(state) { 52 | if (!state) { 53 | return; 54 | } 55 | 56 | const playerOne = state.players[0]; 57 | const playerTwo = state.players[1]; 58 | 59 | playerOne.pos.x += playerOne.vel.x; 60 | playerOne.pos.y += playerOne.vel.y; 61 | 62 | playerTwo.pos.x += playerTwo.vel.x; 63 | playerTwo.pos.y += playerTwo.vel.y; 64 | 65 | if (playerOne.pos.x < 0 || playerOne.pos.x > GRID_SIZE || playerOne.pos.y < 0 || playerOne.pos.y > GRID_SIZE) { 66 | return 2; 67 | } 68 | 69 | if (playerTwo.pos.x < 0 || playerTwo.pos.x > GRID_SIZE || playerTwo.pos.y < 0 || playerTwo.pos.y > GRID_SIZE) { 70 | return 1; 71 | } 72 | 73 | if (state.food.x === playerOne.pos.x && state.food.y === playerOne.pos.y) { 74 | playerOne.snake.push({ ...playerOne.pos }); 75 | playerOne.pos.x += playerOne.vel.x; 76 | playerOne.pos.y += playerOne.vel.y; 77 | randomFood(state); 78 | } 79 | 80 | if (state.food.x === playerTwo.pos.x && state.food.y === playerTwo.pos.y) { 81 | playerTwo.snake.push({ ...playerTwo.pos }); 82 | playerTwo.pos.x += playerTwo.vel.x; 83 | playerTwo.pos.y += playerTwo.vel.y; 84 | randomFood(state); 85 | } 86 | 87 | if (playerOne.vel.x || playerOne.vel.y) { 88 | for (let cell of playerOne.snake) { 89 | if (cell.x === playerOne.pos.x && cell.y === playerOne.pos.y) { 90 | return 2; 91 | } 92 | } 93 | 94 | playerOne.snake.push({ ...playerOne.pos }); 95 | playerOne.snake.shift(); 96 | } 97 | 98 | if (playerTwo.vel.x || playerTwo.vel.y) { 99 | for (let cell of playerTwo.snake) { 100 | if (cell.x === playerTwo.pos.x && cell.y === playerTwo.pos.y) { 101 | return 1; 102 | } 103 | } 104 | 105 | playerTwo.snake.push({ ...playerTwo.pos }); 106 | playerTwo.snake.shift(); 107 | } 108 | 109 | return false; 110 | } 111 | 112 | function randomFood(state) { 113 | food = { 114 | x: Math.floor(Math.random() * GRID_SIZE), 115 | y: Math.floor(Math.random() * GRID_SIZE), 116 | } 117 | 118 | for (let cell of state.players[0].snake) { 119 | if (cell.x === food.x && cell.y === food.y) { 120 | return randomFood(state); 121 | } 122 | } 123 | 124 | for (let cell of state.players[1].snake) { 125 | if (cell.x === food.x && cell.y === food.y) { 126 | return randomFood(state); 127 | } 128 | } 129 | 130 | state.food = food; 131 | } 132 | 133 | function getUpdatedVelocity(keyCode) { 134 | switch (keyCode) { 135 | case 37: { // left 136 | return { x: -1, y: 0 }; 137 | } 138 | case 38: { // down 139 | return { x: 0, y: -1 }; 140 | } 141 | case 39: { // right 142 | return { x: 1, y: 0 }; 143 | } 144 | case 40: { // up 145 | return { x: 0, y: 1 }; 146 | } 147 | } 148 | } 149 | -------------------------------------------------------------------------------- /server/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "dependencies": { 3 | "socket.io": "^2.3.0" 4 | } 5 | } 6 | -------------------------------------------------------------------------------- /server/server.js: -------------------------------------------------------------------------------- 1 | const io = require('socket.io')(); 2 | const { initGame, gameLoop, getUpdatedVelocity } = require('./game'); 3 | const { FRAME_RATE } = require('./constants'); 4 | const { makeid } = require('./utils'); 5 | 6 | const state = {}; 7 | const clientRooms = {}; 8 | 9 | io.on('connection', client => { 10 | 11 | client.on('keydown', handleKeydown); 12 | client.on('newGame', handleNewGame); 13 | client.on('joinGame', handleJoinGame); 14 | 15 | function handleJoinGame(roomName) { 16 | const room = io.sockets.adapter.rooms[roomName]; 17 | 18 | let allUsers; 19 | if (room) { 20 | allUsers = room.sockets; 21 | } 22 | 23 | let numClients = 0; 24 | if (allUsers) { 25 | numClients = Object.keys(allUsers).length; 26 | } 27 | 28 | if (numClients === 0) { 29 | client.emit('unknownCode'); 30 | return; 31 | } else if (numClients > 1) { 32 | client.emit('tooManyPlayers'); 33 | return; 34 | } 35 | 36 | clientRooms[client.id] = roomName; 37 | 38 | client.join(roomName); 39 | client.number = 2; 40 | client.emit('init', 2); 41 | 42 | startGameInterval(roomName); 43 | } 44 | 45 | function handleNewGame() { 46 | let roomName = makeid(5); 47 | clientRooms[client.id] = roomName; 48 | client.emit('gameCode', roomName); 49 | 50 | state[roomName] = initGame(); 51 | 52 | client.join(roomName); 53 | client.number = 1; 54 | client.emit('init', 1); 55 | } 56 | 57 | function handleKeydown(keyCode) { 58 | const roomName = clientRooms[client.id]; 59 | if (!roomName) { 60 | return; 61 | } 62 | try { 63 | keyCode = parseInt(keyCode); 64 | } catch(e) { 65 | console.error(e); 66 | return; 67 | } 68 | 69 | const vel = getUpdatedVelocity(keyCode); 70 | 71 | if (vel) { 72 | state[roomName].players[client.number - 1].vel = vel; 73 | } 74 | } 75 | }); 76 | 77 | function startGameInterval(roomName) { 78 | const intervalId = setInterval(() => { 79 | const winner = gameLoop(state[roomName]); 80 | 81 | if (!winner) { 82 | emitGameState(roomName, state[roomName]) 83 | } else { 84 | emitGameOver(roomName, winner); 85 | state[roomName] = null; 86 | clearInterval(intervalId); 87 | } 88 | }, 1000 / FRAME_RATE); 89 | } 90 | 91 | function emitGameState(room, gameState) { 92 | // Send this event to everyone in the room. 93 | io.sockets.in(room) 94 | .emit('gameState', JSON.stringify(gameState)); 95 | } 96 | 97 | function emitGameOver(room, winner) { 98 | io.sockets.in(room) 99 | .emit('gameOver', JSON.stringify({ winner })); 100 | } 101 | 102 | io.listen(process.env.PORT || 3000); 103 | -------------------------------------------------------------------------------- /server/utils.js: -------------------------------------------------------------------------------- 1 | module.exports = { 2 | makeid, 3 | } 4 | 5 | function makeid(length) { 6 | var result = ''; 7 | var characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; 8 | var charactersLength = characters.length; 9 | for ( var i = 0; i < length; i++ ) { 10 | result += characters.charAt(Math.floor(Math.random() * charactersLength)); 11 | } 12 | return result; 13 | } 14 | -------------------------------------------------------------------------------- /server/yarn.lock: -------------------------------------------------------------------------------- 1 | # THIS IS AN AUTOGENERATED FILE. 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