├── Procfile
├── .gitignore
├── .env-sample
├── public
├── explosion.js
├── invader.svg
├── winner.js
├── gameover.js
├── intro.js
├── style.css
├── script.js
└── space-invaders-hero.svg
├── package.json
├── views
├── gameover.html
├── winner.html
├── gameRoomFull.html
├── index.html
└── intro.html
├── README.md
├── server.js
├── CONTRIBUTING.md
├── server-worker.js
└── LICENSE
/Procfile:
--------------------------------------------------------------------------------
1 | web: node server.js
--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | *node_modules
2 | .env
3 | .vscode
--------------------------------------------------------------------------------
/.env-sample:
--------------------------------------------------------------------------------
1 | ABLY_API_KEY={ABLY_API_KEY}
2 | PORT=8080
3 |
--------------------------------------------------------------------------------
/public/explosion.js:
--------------------------------------------------------------------------------
1 | class Explosion extends Phaser.GameObjects.Sprite {
2 | constructor(scene, x, y) {
3 | super(scene, x, y, "explosion");
4 | scene.add.existing(this);
5 | this.play("explode");
6 | }
7 | }
8 |
--------------------------------------------------------------------------------
/public/invader.svg:
--------------------------------------------------------------------------------
1 |
2 |
5 |
--------------------------------------------------------------------------------
/public/winner.js:
--------------------------------------------------------------------------------
1 | let winner = localStorage.getItem("winner");
2 | let firstRunnerUp = localStorage.getItem("firstRunnerUp");
3 | let secondRunnerUp = localStorage.getItem("secondRunnerUp");
4 | let totalPlayers = localStorage.getItem("totalPlayers");
5 |
6 | document.getElementById("winner-announcement").innerHTML =
7 | winner + " won the game!";
8 |
9 | if (firstRunnerUp) {
10 | document.getElementById("first-runnerup").innerHTML =
11 | firstRunnerUp + " is the first runner up";
12 | }
13 | if (secondRunnerUp) {
14 | document.getElementById("second-runnerup").innerHTML =
15 | secondRunnerUp + " is the second runner up";
16 | }
17 |
--------------------------------------------------------------------------------
/public/gameover.js:
--------------------------------------------------------------------------------
1 | let winner = localStorage.getItem("winner");
2 | let firstRunnerUp = localStorage.getItem("firstRunnerUp");
3 | let secondRunnerUp = localStorage.getItem("secondRunnerUp");
4 | let totalPlayers = localStorage.getItem("totalPlayers");
5 |
6 | document.getElementById("winner-announcement").innerHTML =
7 | winner + " won the game!";
8 |
9 | if (firstRunnerUp) {
10 | document.getElementById("first-runnerup").innerHTML =
11 | firstRunnerUp + " got the highest score";
12 | }
13 | if (secondRunnerUp) {
14 | document.getElementById("second-runnerup").innerHTML =
15 | secondRunnerUp + " got the next highest score";
16 | }
17 |
--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
1 | {
2 | "//1": "describes your app and its dependencies",
3 | "//2": "https://docs.npmjs.com/files/package.json",
4 | "//3": "updating this file will download and update your packages",
5 | "name": "hello-express",
6 | "version": "0.0.1",
7 | "description": "A simple Node app built on Express, instantly up and running.",
8 | "main": "server.js",
9 | "scripts": {
10 | "start": "node server.js"
11 | },
12 | "dependencies": {
13 | "ably": "^1.1.25",
14 | "dotenv": "^8.2.0",
15 | "express": "^4.17.1",
16 | "p2": "^0.7.1"
17 | },
18 | "engines": {
19 | "node": "12.x"
20 | },
21 | "repository": {
22 | "url": "https://glitch.com/edit/#!/hello-express"
23 | },
24 | "license": "MIT",
25 | "keywords": [
26 | "node",
27 | "glitch",
28 | "express"
29 | ]
30 | }
31 |
--------------------------------------------------------------------------------
/public/intro.js:
--------------------------------------------------------------------------------
1 | let nickname = "";
2 | let roomCode = "";
3 |
4 | function hostNewGame() {
5 | localStorage.clear();
6 | let nicknameInput = document.getElementById("create-nickname");
7 | nickname = nicknameInput.value;
8 | roomCode = getRandomRoomId();
9 | localStorage.setItem("isHost", true);
10 | localStorage.setItem("nickname", nickname);
11 | localStorage.setItem("roomCode", roomCode);
12 | window.location.replace("/gameplay?roomCode=" + roomCode + "&isHost=true");
13 | }
14 |
15 | function joinRoom() {
16 | localStorage.clear();
17 | let nicknameInput = document.getElementById("join-nickname");
18 | nickname = nicknameInput.value;
19 | roomCode = document.getElementById("join-room-code").value;
20 | localStorage.setItem("isHost", false);
21 | localStorage.setItem("nickname", nickname);
22 | localStorage.setItem("roomCode", roomCode);
23 | window.location.replace("/gameplay?roomCode=" + roomCode + "&isHost=false");
24 | }
25 |
26 | function getRandomRoomId() {
27 | return "room-" + Math.random().toString(36).substr(2, 8);
28 | }
29 |
--------------------------------------------------------------------------------
/views/gameover.html:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 | Space Invaders
6 | Game over
21 |
24 |
28 |
29 |
30 |
31 |
--------------------------------------------------------------------------------
/views/winner.html:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 | Space Invaders
6 | The game has ended
21 |
24 |
28 |
29 |
30 |
31 |
--------------------------------------------------------------------------------
/views/gameRoomFull.html:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 | Space Invaders
6 |
22 |
23 | Sorry, the game room you are trying to join is either full or doesn't exist.
24 |
25 |
Space Invaders
6 |
32 |
33 |
x
34 |
39 |
40 |
46 | Copy game link
47 |
48 |
49 |
51 |
52 |
Score: 0
53 |
Game room 0
54 |
55 |
56 |
57 | Audio
58 |
60 |
61 |
62 |
63 |
68 |
73 | Start game
74 |
75 |
76 |
77 |
78 |
79 |
--------------------------------------------------------------------------------
/server.js:
--------------------------------------------------------------------------------
1 | const {
2 | Worker,
3 | isMainThread,
4 | parentPort,
5 | workerData,
6 | threadId,
7 | MessageChannel,
8 | } = require("worker_threads");
9 |
10 | const envConfig = require("dotenv").config();
11 | const express = require("express");
12 | const Ably = require("ably");
13 | const p2 = require("p2");
14 | const app = express();
15 | const {ABLY_API_KEY, PORT} = process.env;
16 |
17 | console.log("Environment variables", envConfig)
18 |
19 | const globalGameName = "main-game-thread";
20 | const GAME_ROOM_CAPACITY = 6;
21 | let globalChannel;
22 | let activeGameRooms = {};
23 |
24 | // instantiate to Ably
25 | const realtime = new Ably.Realtime({
26 | key: ABLY_API_KEY,
27 | echoMessages: false,
28 | });
29 |
30 | // create a uniqueId to assign to clients on auth
31 | const uniqueId = function () {
32 | return "id-" + Math.random().toString(36).substr(2, 16);
33 | };
34 |
35 | app.use(express.static("public"));
36 |
37 | app.get("/auth", (request, response) => {
38 | const tokenParams = { clientId: uniqueId() };
39 | realtime.auth.createTokenRequest(tokenParams, function (err, tokenRequest) {
40 | if (err) {
41 | response
42 | .status(500)
43 | .send("Error requesting token: " + JSON.stringify(err));
44 | } else {
45 | response.setHeader("Content-Type", "application/json");
46 | response.send(JSON.stringify(tokenRequest));
47 | }
48 | });
49 | });
50 |
51 | app.get("/", (request, response) => {
52 | response.header("Access-Control-Allow-Origin", "*");
53 | response.header(
54 | "Access-Control-Allow-Headers",
55 | "Origin, X-Requested-With, Content-Type, Accept"
56 | );
57 | response.sendFile(__dirname + "/views/intro.html");
58 | });
59 |
60 | app.get("/gameplay", (request, response) => {
61 | let requestedRoom = request.query.roomCode;
62 | let isReqHost = request.query.isHost == "true";
63 | if (!isReqHost && activeGameRooms[requestedRoom]) {
64 | if (
65 | activeGameRooms[requestedRoom].totalPlayers + 1 <= GAME_ROOM_CAPACITY &&
66 | !activeGameRooms[requestedRoom].gameOn
67 | ) {
68 | response.sendFile(__dirname + "/views/index.html");
69 | } else {
70 | console.log("here");
71 | response.sendFile(__dirname + "/views/gameRoomFull.html");
72 | }
73 | } else if (isReqHost) {
74 | response.sendFile(__dirname + "/views/index.html");
75 | } else {
76 | response.sendFile(__dirname + "/views/gameRoomFull.html");
77 | }
78 | console.log(JSON.stringify(activeGameRooms));
79 | });
80 |
81 | app.get("/winner", (request, response) => {
82 | response.sendFile(__dirname + "/views/winner.html");
83 | });
84 |
85 | app.get("/gameover", (request, response) => {
86 | response.sendFile(__dirname + "/views/gameover.html");
87 | });
88 |
89 | const listener = app.listen(PORT, () => {
90 | console.log("Your app is listening on port " + listener.address().port);
91 | });
92 |
93 | // wait until connection with Ably is established
94 | realtime.connection.once("connected", () => {
95 | globalChannel = realtime.channels.get(globalGameName);
96 | // subscribe to new players entering the game
97 | globalChannel.presence.subscribe("enter", (player) => {
98 | generateNewGameThread(
99 | player.data.isHost,
100 | player.data.nickname,
101 | player.data.roomCode,
102 | player.clientId
103 | );
104 | });
105 | });
106 |
107 | function generateNewGameThread(
108 | isHost,
109 | hostNickname,
110 | hostRoomCode,
111 | hostClientId
112 | ) {
113 | if (isHost && isMainThread) {
114 | const worker = new Worker("./server-worker.js", {
115 | workerData: {
116 | hostNickname: hostNickname,
117 | hostRoomCode: hostRoomCode,
118 | hostClientId: hostClientId,
119 | },
120 | });
121 | console.log(`CREATING NEW THREAD WITH ID ${threadId}`);
122 | worker.on("error", (error) => {
123 | console.log(`WORKER EXITED DUE TO AN ERROR ${error}`);
124 | });
125 | worker.on("message", (msg) => {
126 | if (msg.roomName && !msg.resetEntry) {
127 | activeGameRooms[msg.roomName] = {
128 | roomName: msg.roomName,
129 | totalPlayers: msg.totalPlayers,
130 | gameOn: msg.gameOn,
131 | };
132 | } else if (msg.roomName && msg.resetEntry) {
133 | delete activeGameRooms[msg.roomName];
134 | }
135 | });
136 | worker.on("exit", (code) => {
137 | console.log(`WORKER EXITED WITH THREAD ID ${threadId}`);
138 | if (code !== 0) {
139 | console.log(`WORKER EXITED DUE TO AN ERROR WITH CODE ${code}`);
140 | }
141 | });
142 | }
143 | }
144 |
--------------------------------------------------------------------------------
/CONTRIBUTING.md:
--------------------------------------------------------------------------------
1 | Hi there, welcome to contributing guidelines for this project.
2 |
3 | ### What do I need to know to help?
4 |
5 | If you are interested in making a code contribution and would like to learn more about the technologies that this projects use, check out the list below.
6 |
7 | - [JavaScript](https://www.javascript.com/)
8 | - [NodeJS](https://nodejs.org/en/)
9 | - [Phaser3](https://phaser.io/)
10 | - [Ably Realtime](https://www.ably.io)
11 | - [p2 physics engine](https://www.npmjs.com/package/p2)
12 |
13 | A very detailed tutorial for this project is available on [Dev.to](https://dev.to/ablydev/building-a-realtime-multiplayer-browser-game-in-less-than-a-day-part-1-4-14pm)
14 |
15 | ### How do I make a contribution?
16 |
17 | 1. Find an issue tagged that you are interested in addressing or a feature that you would like to add.
18 |
19 | 2. Fork the repository associated with the issue to your local GitHub organization. This means that you will have a copy of the repository under your-GitHub-username/repository-name.
20 |
21 | 3. Clone the repository to your local machine using git clone https://github.com/github-username/repository-name.git.
22 | 4. Create a new branch for your fix using git checkout -b .
23 | 5. Make the appropriate changes for the issue you are trying to address or the feature that you want to add.
24 | 6. Use git add to add the file contents of the changed files to the "snapshot" git uses to manage the state of the project, also known as the index.
25 |
26 | 7. Use git commit -m "Insert a short message of the changes made here" to store the contents of the index with a descriptive message.
27 | 8. Push the changes to the remote repository using git push origin branch-name-here.
28 | 9. Submit a pull request to the upstream repository.
29 | 10. Title the pull request with a short description of the changes made and the issue or bug number associated with your change. For example, you can title an issue like so "Added volume control feature to address #4352".
30 | 11. In the description of the pull request, explain the changes that you made, any issues you think exist with the pull request you made, and any questions you have for the maintainer. It's OK if your pull request is not perfect (no pull request is), the reviewer will be able to help you fix any problems and improve it!
31 | 12. Wait for the pull request to be reviewed by a maintainer.
32 | 13. Make changes to the pull request if the reviewing maintainer recommends them.
33 | 14. Celebrate your success after your pull request is merged!
34 |
35 | ### Where can I go for help?
36 |
37 | If you need help, you can reach out to [Srushtika](https://twitter.com/Srushtika) on Twitter or open a support ticket at support@ably.com
38 |
39 | ## Any contributions you make will be under the MIT Software License
40 |
41 | In short, when you submit code changes, your submissions are understood to be under the same [MIT License](http://choosealicense.com/licenses/mit/) that covers the project. Feel free to contact the maintainers if that's a concern.
42 |
43 | ## Report bugs using Github's [issues](https://github.com/ably/depict-it/issues)
44 |
45 | We use GitHub issues to track public bugs. Report a bug by [opening a new issue](); it's that easy!
46 |
47 | ### Write bug reports with detail, background, and sample code
48 |
49 | **Great Bug Reports** tend to have:
50 |
51 | - A quick summary and/or background
52 | - Steps to reproduce
53 | - Be specific!
54 | - Give sample code if you can. [My stackoverflow question](http://stackoverflow.com/q/12488905/180626) includes sample code that _anyone_ with a base R setup can run to reproduce what I was seeing
55 | - What you expected would happen
56 | - What actually happens
57 | - Notes (possibly including why you think this might be happening, or stuff you tried that didn't work)
58 |
59 | We _love_ thorough bug reports! 💖
60 |
61 | ### License
62 |
63 | By contributing, you agree that your contributions will be licensed under its MIT License.
64 |
65 | ### Code of Conduct
66 |
67 | Our Code of Conduct means that you are responsible for treating everyone on the project with respect and courtesy regardless of their identity.
68 |
69 | If you are the victim of any inappropriate behavior or comments as described in our Code of Conduct, we are here for you and will do the best to ensure that the abuser is reprimanded appropriately. Please reach out to [Srushtika](https://twitter.com/Srushtika) in case of any concerns.
70 |
71 | ## References
72 |
73 | This document was adapted from the open-source contribution guidelines for [Facebook's Draft](https://github.com/facebook/draft-js/blob/a9316a723f9e918afde44dea68b5f9f39b7d9b00/CONTRIBUTING.md) and [Safia Abdalla's article](https://opensource.com/life/16/3/contributor-guidelines-template-and-tips) on OpenSource.com
74 |
--------------------------------------------------------------------------------
/views/intro.html:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 | Space Invaders
6 |
31 | Use the arrow keys on your keyboard to move your avatar left or right to
32 | escape the bullets from the spaceship. Your goal is to make it to the
33 | other side, alive!
34 |
35 |
36 |
126 |
127 |
128 |
133 |
134 |
139 |
144 |
149 |
150 |
151 |
152 |
--------------------------------------------------------------------------------
/public/style.css:
--------------------------------------------------------------------------------
1 | body {
2 | margin: 0;
3 | padding: 10px;
4 | }
5 |
6 | * {
7 | box-sizing: border-box;
8 | }
9 |
10 | input {
11 | height: 40px;
12 | display: block;
13 | margin: 0;
14 | padding: 5px 10px;
15 | border: 0;
16 | border-right: 1px solid silver;
17 | border-radius: 0;
18 | font-size: 16px;
19 | }
20 |
21 | .intro-body {
22 | font-family: "VT323";
23 | font-size: 22px;
24 | text-align: center;
25 | color: #fff;
26 | background-color: black;
27 | background-image: url("https://cdn.glitch.com/f66772e3-bbf6-4f6d-b5d5-94559e3c1c6f%2FScreenshot%202020-05-19%20at%2013.36.26.png?v=1589892011044");
28 | }
29 |
30 | .intro-img {
31 | width: 80%;
32 | max-width: 800px;
33 | }
34 |
35 | .room-full-body {
36 | font-family: "VT323";
37 | font-size: 52px;
38 | text-align: center;
39 | color: #fff;
40 | background-color: black;
41 | background-image: url("https://cdn.glitch.com/f66772e3-bbf6-4f6d-b5d5-94559e3c1c6f%2FScreenshot%202020-05-19%20at%2013.36.26.png?v=1589892011044");
42 | }
43 |
44 | .index-body {
45 | font-family: "VT323";
46 | font-size: 22px;
47 | color: #fff;
48 | background-color: black;
49 | }
50 |
51 | .game-text {
52 | max-width: 700px;
53 | margin-left: auto;
54 | margin-right: auto;
55 | }
56 |
57 | .game-instructions {
58 | width: 80%;
59 | margin: 20px auto;
60 | padding-top: 20px;
61 | font-size: 30px;
62 | }
63 |
64 | .create-room {
65 | width: 60%;
66 | margin: 0 auto;
67 | padding: 10px 0;
68 | text-align: center;
69 | display: inline-block;
70 | }
71 |
72 | .button-center {
73 | display: inline-block;
74 | }
75 |
76 | .text-center {
77 | text-align: center;
78 | }
79 |
80 | .room-input {
81 | display: flex;
82 | justify-content: center;
83 | align-items: center;
84 | width: 70%;
85 | margin: 0 auto;
86 | padding: 10px 0;
87 | }
88 |
89 | .nickname {
90 | width: 30%;
91 | min-width: 300px;
92 | margin: 30px auto 10px;
93 | text-align: center;
94 | }
95 |
96 | #score {
97 | width: 100px;
98 | margin-right: 10px;
99 | }
100 |
101 | #room-code {
102 | width: 480px;
103 | }
104 |
105 | #deaths {
106 | margin-left: auto;
107 | text-align: right;
108 | }
109 |
110 | .game-area {
111 | display: flex;
112 | justify-content: space-between;
113 | }
114 |
115 | .game-div {
116 | margin: 20px;
117 | max-width: 1200px;
118 | text-align: center;
119 | }
120 |
121 | .game-div-container {
122 | text-align: center;
123 | display: block;
124 | }
125 |
126 | .game-headline-left {
127 | float: left;
128 | }
129 |
130 | .game-headline-right {
131 | float: right;
132 | }
133 |
134 | .winner-body {
135 | font-family: "VT323";
136 | font-size: 62px;
137 | text-align: center;
138 | color: #fff;
139 | background-color: black;
140 | background-image: url("https://cdn.glitch.com/f66772e3-bbf6-4f6d-b5d5-94559e3c1c6f%2FScreenshot%202020-05-19%20at%2013.36.26.png?v=1589892011044");
141 | }
142 |
143 | .winner-div {
144 | width: 80%;
145 | margin: 0 auto;
146 | padding-top: 20px;
147 | font-size: 82px;
148 | }
149 |
150 | .winner-text {
151 | text-transform: uppercase;
152 | }
153 |
154 | .runner-ups-div {
155 | width: 80%;
156 | margin: 0 auto;
157 | padding-top: 20px;
158 | font-size: 42px;
159 | }
160 |
161 | .bg-modal {
162 | display: none;
163 | position: absolute;
164 | top: 0;
165 | justify-content: center;
166 | align-items: center;
167 | width: 100%;
168 | height: 100%;
169 | color: #fff;
170 | background-color: rgba(0, 0, 0, 0.7);
171 | }
172 |
173 | .modal-content {
174 | position: relative;
175 | width: 500px;
176 | height: 300px;
177 | padding: 20px;
178 | border: 5px solid white;
179 | border-radius: 4px;
180 | text-align: center;
181 | }
182 |
183 | .button {
184 | display: inline-block;
185 | margin-top: 10px;
186 | padding: 10px 28px;
187 | border: 2px solid white;
188 | border-radius: 10px;
189 | text-decoration: none;
190 | font-size: 16px;
191 | font-family: "VT323";
192 | color: white;
193 | background-color: #000;
194 | }
195 |
196 | .button:hover {
197 | border: 2px solid black;
198 | color: #000;
199 | background-color: white;
200 | }
201 |
202 | .button:active {
203 | border: 2px solid black;
204 | color: #000;
205 | background-color: white;
206 | }
207 |
208 | label {
209 | display: block;
210 | margin: 15px auto;
211 | }
212 |
213 | .close {
214 | position: absolute;
215 | top: 0;
216 | right: 14px;
217 | font-size: 42px;
218 | cursor: pointer;
219 | }
220 |
221 | .text-group {
222 | border: none;
223 | color: white;
224 | background-color: black;
225 | }
226 |
227 | .input-button {
228 | flex-shrink: 0;
229 | width: max-content;
230 | height: 40px;
231 | padding: 0 20px;
232 | border: 0;
233 | color: var(--gray);
234 | font-weight: 400;
235 | font-size: 1rem;
236 | text-transform: uppercase;
237 | }
238 |
239 | .input-button:hover {
240 | color: white;
241 | background-color: var(--gray);
242 | }
243 |
244 | .room-input-text {
245 | margin: 0 10px;
246 | }
247 |
248 | .room-code {
249 | min-width: 300px;
250 | }
251 |
252 | .img-invaders {
253 | width: 60%;
254 | }
255 |
256 | .copy {
257 | width: 60px;
258 | height: 60px;
259 | }
260 |
261 | .audio-control {
262 | display: flex;
263 | width: 100px;
264 | margin-right: 10px;
265 | }
266 |
267 | .audio-label {
268 | margin: 0 15px;
269 | }
270 |
271 | .audio-chkbox {
272 | padding: 0;
273 | height: 25px;
274 | }
275 |
276 | /*======================*/
277 |
278 | .game-card {
279 | margin: 10px 50px;
280 | padding: 50px;
281 | background-image: url("https://user-images.githubusercontent.com/5900152/90127067-85382380-dd5c-11ea-87b1-4946c0df92d8.jpg");
282 | }
283 |
284 | .info-bar {
285 | display: flex;
286 | padding: 10px 50px;
287 | justify-content: space-evenly;
288 | }
289 |
290 | .start-btn-div {
291 | text-align: center;
292 | font-family: inherit;
293 | }
294 |
295 | .start-info-card {
296 | width: 50%;
297 | margin: 20px;
298 | }
299 |
300 | .nav-tabs {
301 | justify-content: center;
302 | }
303 |
304 | .input-box {
305 | text-align: center;
306 | }
307 |
308 | .create-wait-msg {
309 | display: none;
310 |
311 | }
--------------------------------------------------------------------------------
/server-worker.js:
--------------------------------------------------------------------------------
1 | const {
2 | Worker,
3 | isMainThread,
4 | parentPort,
5 | threadId,
6 | workerData,
7 | } = require("worker_threads");
8 | const envConfig = require("dotenv").config();
9 | const Ably = require("ably");
10 | const p2 = require("p2");
11 |
12 | const ABLY_API_KEY = process.env.ABLY_API_KEY;
13 |
14 | const CANVAS_HEIGHT = 700;
15 | const CANVAS_WIDTH = 1400;
16 | const SHIP_PLATFORM = CANVAS_HEIGHT - 12;
17 | const BULLET_PLATFORM = SHIP_PLATFORM - 32;
18 | const PLAYER_VERTICAL_INCREMENT = 20;
19 | const PLAYER_VERTICAL_MOVEMENT_UPDATE_INTERVAL = 1000;
20 | const PLAYER_SCORE_INCREMENT = 5;
21 | const P2_WORLD_TIME_STEP = 1 / 16;
22 | const MIN_PLAYERS_TO_START_GAME = 6;
23 | const GAME_TICKER_MS = 100;
24 |
25 | let players = {};
26 | let playerChannels = {};
27 | let shipX = between(20, CANVAS_WIDTH - 20);
28 | let shipY = SHIP_PLATFORM;
29 | let colorIndex = 0;
30 | let avatarTypes = ["A", "B", "C"];
31 | let gameOn = false;
32 | let alivePlayers = 0;
33 | let totalPlayers = 0;
34 | let gameRoomName = workerData.hostRoomCode + ":primary";
35 | let roomCode = workerData.hostRoomCode;
36 | let hostClientId = workerData.hostClientId;
37 | let hostNickname = workerData.hostNickname;
38 | let gameRoom;
39 | let gameTickerOn = false;
40 | let bulletTimer = 0;
41 | let shipBody;
42 | let world;
43 | let shipVelocityTimer = 0;
44 | let killerBulletId = "";
45 | let copyOfShipBody = {
46 | position: "",
47 | velocity: "",
48 | };
49 |
50 | // instantiate to Ably
51 | const realtime = new Ably.Realtime({
52 | key: ABLY_API_KEY,
53 | echoMessages: false,
54 | });
55 |
56 | // wait until connection with Ably is established
57 | realtime.connection.once("connected", () => {
58 | gameRoom = realtime.channels.get(gameRoomName);
59 |
60 | // subscribe to new players entering the game
61 | gameRoom.presence.subscribe("enter", (player) => {
62 | console.log("new player");
63 | let newPlayerId;
64 | alivePlayers++;
65 | totalPlayers++;
66 | parentPort.postMessage({
67 | roomName: roomCode,
68 | totalPlayers: totalPlayers,
69 | gameOn: gameOn,
70 | });
71 | newPlayerId = player.clientId;
72 | playerChannels[newPlayerId] = realtime.channels.get(
73 | workerData.hostRoomCode + ":clientChannel-" + player.clientId
74 | );
75 | if (++colorIndex == 6) {
76 | colorIndex = 0;
77 | }
78 | if (totalPlayers == 1) {
79 | gameTickerOn = true;
80 | startGameDataTicker();
81 | }
82 | newPlayerObject = {
83 | id: newPlayerId,
84 | invaderAvatarType: avatarTypes[between(0, 3)],
85 | invaderAvatarColor: randomColorGenerator(),
86 | x: playerXposition(colorIndex),
87 | y: 20,
88 | score: 0,
89 | nickname: player.data.nickname,
90 | isAlive: true,
91 | };
92 | players[newPlayerId] = newPlayerObject;
93 | subscribeToPlayerInput(playerChannels[newPlayerId], newPlayerId);
94 | });
95 |
96 | // subscribe to players leaving the game
97 | gameRoom.presence.subscribe("leave", (player) => {
98 | let leavingPlayer = player.clientId;
99 | alivePlayers--;
100 | totalPlayers--;
101 | parentPort.postMessage({
102 | roomName: roomCode,
103 | totalPlayers: totalPlayers,
104 | });
105 | delete players[leavingPlayer];
106 | if (totalPlayers <= 0) {
107 | killWorkerThread();
108 | }
109 | });
110 | gameRoom.publish("thread-ready", {
111 | start: true,
112 | });
113 | });
114 |
115 | // start the ship and bullets
116 | function startShipAndBullets() {
117 | gameOn = true;
118 |
119 | world = new p2.World({
120 | gravity: [0, -9.82],
121 | });
122 | shipBody = new p2.Body({
123 | position: [shipX, shipY],
124 | velocity: [calcRandomVelocity(), 0],
125 | });
126 | world.addBody(shipBody);
127 | startMovingPhysicsWorld();
128 |
129 | for (let playerId in players) {
130 | startDownwardMovement(playerId);
131 | }
132 | }
133 |
134 | // start the game tick
135 | function startGameDataTicker() {
136 | let tickInterval = setInterval(() => {
137 | if (!gameTickerOn) {
138 | clearInterval(tickInterval);
139 | } else {
140 | bulletOrBlank = "";
141 | bulletTimer += GAME_TICKER_MS;
142 | if (bulletTimer >= GAME_TICKER_MS * 5) {
143 | bulletTimer = 0;
144 | bulletOrBlank = {
145 | y: BULLET_PLATFORM,
146 | id: "bulletId-" + generateRandomId(),
147 | };
148 | }
149 | if (shipBody) {
150 | copyOfShipBody = shipBody;
151 | }
152 |
153 | // fan out the latest game state
154 | gameRoom.publish("game-state", {
155 | players: players,
156 | playerCount: totalPlayers,
157 | shipBody: copyOfShipBody.position,
158 | bulletOrBlank: bulletOrBlank,
159 | gameOn: gameOn,
160 | killerBullet: killerBulletId,
161 | });
162 | }
163 | }, GAME_TICKER_MS);
164 | }
165 |
166 | // subscribe to each player's input events
167 | function subscribeToPlayerInput(channelInstance, playerId) {
168 | channelInstance.subscribe("pos", (msg) => {
169 | if (msg.data.keyPressed == "left") {
170 | if (players[playerId].x - 20 < 20) {
171 | players[playerId].x = 25;
172 | } else {
173 | players[playerId].x -= 20;
174 | }
175 | } else if (msg.data.keyPressed == "right") {
176 | if (players[playerId].x + 20 > 1380) {
177 | players[playerId].x = 1375;
178 | } else {
179 | players[playerId].x += 20;
180 | }
181 | }
182 | });
183 | channelInstance.subscribe("start-game", (msg) => {
184 | startShipAndBullets();
185 | });
186 |
187 | // subscribe to players being shot
188 | channelInstance.subscribe("dead-notif", (msg) => {
189 | players[msg.data.deadPlayerId].isAlive = false;
190 | killerBulletId = msg.data.killerBulletId;
191 | alivePlayers--;
192 | if (alivePlayers == 0) {
193 | setTimeout(() => {
194 | finishGame("");
195 | }, 1000);
196 | }
197 | });
198 | }
199 |
200 | // update the y position of each player when the game starts
201 | function startDownwardMovement(playerId) {
202 | let interval = setInterval(() => {
203 | if (players[playerId] && players[playerId].isAlive) {
204 | players[playerId].y += PLAYER_VERTICAL_INCREMENT;
205 | players[playerId].score += PLAYER_SCORE_INCREMENT;
206 |
207 | if (players[playerId].y > SHIP_PLATFORM) {
208 | finishGame(playerId);
209 | clearInterval(interval);
210 | }
211 | } else {
212 | clearInterval(interval);
213 | }
214 | }, PLAYER_VERTICAL_MOVEMENT_UPDATE_INTERVAL);
215 | }
216 |
217 | // finish the game
218 | function finishGame(playerId) {
219 | console.log("finished");
220 | let firstRunnerUpName = "";
221 | let secondRunnerUpName = "";
222 | let winnerName = "Nobody";
223 | let leftoverPlayers = new Array();
224 | for (let item in players) {
225 | leftoverPlayers.push({
226 | nickname: players[item].nickname,
227 | score: players[item].score,
228 | });
229 | }
230 |
231 | leftoverPlayers.sort((a, b) => {
232 | return b.score - a.score;
233 | });
234 | if (playerId == "") {
235 | if (leftoverPlayers.length >= 3) {
236 | firstRunnerUpName = leftoverPlayers[0].nickname;
237 | secondRunnerUpName = leftoverPlayers[1].nickname;
238 | } else if (leftoverPlayers == 2) {
239 | firstRunnerUp = leftoverPlayers[0].nickname;
240 | }
241 | } else {
242 | winnerName = players[playerId].nickname;
243 | if (leftoverPlayers.length >= 3) {
244 | firstRunnerUpName = leftoverPlayers[1].nickname;
245 | secondRunnerUpName = leftoverPlayers[2].nickname;
246 | } else if (leftoverPlayers.length == 2) {
247 | firstRunnerUpName = leftoverPlayers[1].nickname;
248 | }
249 | }
250 |
251 | // fan out leaderboard info when the game has finished
252 | gameRoom.publish("game-over", {
253 | winner: winnerName,
254 | firstRunnerUp: firstRunnerUpName,
255 | secondRunnerUp: secondRunnerUpName,
256 | totalPlayers: totalPlayers,
257 | });
258 |
259 | killWorkerThread();
260 | }
261 |
262 | // reset all variables in the server
263 | function killWorkerThread() {
264 | parentPort.postMessage({
265 | resetEntry: true,
266 | roomName: roomCode,
267 | });
268 | for (let item in playerChannels) {
269 | playerChannels[item].detach();
270 | }
271 | process.exit(0);
272 | }
273 |
274 | // assign player position per color to form pride rainbow
275 | function playerXposition(index) {
276 | switch (index) {
277 | case 0:
278 | return between(22, 246);
279 | case 1:
280 | return between(247, 474);
281 | case 2:
282 | return between(475, 702);
283 | case 3:
284 | return between(703, 930);
285 | case 4:
286 | return between(931, 1158);
287 | case 5:
288 | return between(1159, 1378);
289 | default:
290 | return between(22, 246);
291 | }
292 | }
293 |
294 | function between(min, max) {
295 | return Math.floor(Math.random() * (max - min) + min);
296 | }
297 |
298 | function generateRandomId() {
299 | return Math.random().toString(36).substr(2, 8);
300 | }
301 |
302 | // start the server-side physics world
303 | function startMovingPhysicsWorld() {
304 | let p2WorldInterval = setInterval(function () {
305 | if (!gameOn) {
306 | clearInterval(p2WorldInterval);
307 | } else {
308 | // updates velocity every 5 seconds
309 | if (++shipVelocityTimer >= 80) {
310 | shipVelocityTimer = 0;
311 | shipBody.velocity[0] = calcRandomVelocity();
312 | }
313 | world.step(P2_WORLD_TIME_STEP);
314 | if (shipBody.position[0] > 1400 && shipBody.velocity[0] > 0) {
315 | shipBody.position[0] = 0;
316 | } else if (shipBody.position[0] < 0 && shipBody.velocity[0] < 0) {
317 | shipBody.position[0] = 1400;
318 | }
319 | }
320 | }, 1000 * P2_WORLD_TIME_STEP);
321 | }
322 |
323 | // calculate a random horizontal velocity for the ship
324 | function calcRandomVelocity() {
325 | let randomShipXVelocity = between(20, 200);
326 | randomShipXVelocity *= Math.floor(Math.random() * 2) == 1 ? 1 : -1;
327 | return randomShipXVelocity;
328 | }
329 |
330 | // method to randomly generate a color for the player
331 | function randomColorGenerator() {
332 | const randomColor = "000000".replace(/0/g, function () {
333 | return (~~(Math.random() * 16)).toString(16);
334 | });
335 | return "0x" + randomColor;
336 | }
337 |
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/public/script.js:
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1 | let globalChannel;
2 | let myClientId;
3 | let myChannel;
4 | let myChannelName;
5 | let gameOn = false;
6 | let players = {};
7 | let totalPlayers = 0;
8 | let latestShipPosition;
9 | let bulletThatShotMe;
10 | let bulletThatShotSomeone;
11 | let bulletOutOfBounds = "";
12 | let amIalive = false;
13 | let game;
14 | let myGameRoomName;
15 | let myGameRoomCh;
16 |
17 | const myNickname = localStorage.getItem("nickname");
18 | const myGameRoomCode = localStorage.getItem("roomCode");
19 | const amIHost = localStorage.getItem("isHost");
20 | const startGameBtn = document.getElementById("btn-startgame");
21 | const audioControlChkbox = document.getElementById("audio-chkbox");
22 |
23 | document.getElementById("room-code").innerHTML =
24 | "Other players can join using the code: " + myGameRoomCode;
25 |
26 | // connect to Ably
27 | const realtime = new Ably.Realtime({
28 | authUrl: "/auth",
29 | });
30 |
31 | //show modal
32 | if (amIHost == "true") {
33 | document.querySelector(".bg-modal").style.display = "flex";
34 | document.getElementById("game-link").innerHTML =
35 | "Invite your friends to join using the code:
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/README.md:
--------------------------------------------------------------------------------
1 | 
2 |
3 | # Realtime multiplayer game of Space Invaders
4 |
5 | This project runs a realtime multiplayer version of the classic retro game, Space Invaders.
6 |
7 | 
8 |
9 | ## Services/ libraries used in the game
10 |
11 | - [Phaser 3](https://phaser.io)
12 | - [p2 NPM library](https://www.npmjs.com/package/p2)
13 | - [Ably Realtime](https://www.ably.com)
14 |
15 | You will require an Ably API Key, to run this demo, [sign-up for FREE account](https://ably.com/sign-up)
16 |
17 | # How to run this game
18 |
19 | 1. Create a free account with [Ably Realtime](https://www.ably.com) and obtain an API Key
20 | 1. Clone this repo locally
21 | 1. Navigate to the project folder and run `npm install` to install the dependencies
22 | 1. Rename `.env-sample` to `.env`, then edit the file and add your Ably API key and prefered PORT (default 8080).
23 | 1. (Optional) You can update the `MIN_PLAYERS_TO_START_GAME` to enforce a minimum number of players. (see `server-worker.js`)
24 | 1. Run the server with `node server.js` and then open a brower to [localhost:8080](http://localhost:8080)
25 |
26 | Read the full blog post series on [dev.to](https://dev.to/ably/building-a-realtime-multiplayer-browser-game-in-less-than-a-day-part-1-4-14pm).
27 |
28 | Please [reach out to me on Twitter](https://www.twitter.com/Srushtika) for any questions,
29 | or follow us [@ablyrealtime](https://twitter.com/ablyrealtime)
30 |
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/views/index.html:
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1 |
2 |
3 |
4 |
5 |