forked from eric-wieser/snakes
/
index.ejs
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index.ejs
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<!doctype html>
<html xmlns:og="http://opengraphprotocol.org/schema/">
<head>
<meta property="og:title" content="Snakes - A multiplayer game written in javascript using the HTML5 canvas, node.js, and Socket.IO"/>
<meta property="og:type" content="website"/>
<meta property="og:url" content="http://snakes.eric-wieser.tk/"/>
<meta property="og:description" content="A game for two (or more) players. Control the snakes with the arrow keys and WASD. Eat or be eaten!"/>
<meta property="og:image" content="http://eric-wieser.tk/images/snaps/snakes.png" />
<meta property="fb:admins" content="eric.wieser"/>
<link rel="shortcut icon" href="/favicon.png">
<script src="/socket.io/socket.io.js"></script>
<script src="browserify.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script><link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Dosis:300,600|Ubuntu" />
<style>
html, body {
background: #202020; width: 100%; height: 100%; margin: 0; padding: 0;
font-family: 'Dosis', Arial, sans-serif;
font-weight:300;
}
#message {
color: white;
position: absolute;
top:10px;
left: 0;
right: 0;
font-size: 30px;
text-align: center;
}
.score-bar {
position: absolute;
width: 100%;
height: 10px;
background: #808080;
}
.score-bar div {
position: absolute;
height: 10px;
}
.vertical-center {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
display: table;
}
.vertical-center > div{
/*position: relative;
top: -50%;
left: -50%;*/
display: table-cell;
vertical-align: middle;
}
.vertical-center > div > div{
/*position: relative;
top: -50%;
left: -50%;*/
margin: auto;
}
h1{
background: #404040;
color: white;
margin: 0;
padding: 5px;
line-height: 40px;
font-size: 36px;
}
h2 {
color: #ff8000;
line-height: 30px;
font-size: 24px;
padding: 5px;
margin: 0;
}
p {
margin: 0;
padding: 5px;
font-family: Ubuntu;
line-height: 20px;
}
small {
padding: 5px;
font-family: Ubuntu;
color: #808080;
width: 100%;
text-align: center;
display: block;
}
a {
color: #ff8000;
border-bottom: 1px dotted #ff8000;
text-decoration: none;
}
.box {
border-top: 5px solid;
border-bottom: 5px solid;
/*box-shadow: 0 0 25px #404040;*/
overflow: hidden;
background: rgba(64, 64, 64, 0.5);
color: white;
}
#login .box{
width: 400px;
}
#login input{
width: 100%;
box-sizing: border-box;
margin: 0;
display: block;
padding: 0px;
height: 50px;
line-height: 50px;
font: inherit;
font-size: 40px;
border: none;
text-align: center;
outline: none;
background-color: transparent;
}
#login button {
display: none;
}
#about .box{
width: 80%;
}
#bottom {
position: absolute;
bottom: 0;
left: 0;
right: 0;
}
#scores {
font-size: 30px;
line-height: 35px;
padding: 0;
margin: 0;
width: 100%;
display: table;
}
#scores li {
display: table-row;
color: white;
}
#scores li span {
display: table-cell;
width: 50%;
}
#scores li span.name {
font-weight: 700;
text-align: right;
padding-right: 0.5em;
}
#chat input{
font: inherit;
height: 20px;
color: white;
padding: 0px;
margin: 0;
border: 0;
display: block;
width: 100%;
box-sizing: border-box;
background: transparent;
outline: none;
}
#chat .history {
color: white;
margin: 0;
padding: 0;
position: absolute;
bottom: 20px;
}
#chat .history li {
color: white;
padding: 0;
margin: 0;
word-wrap: break-word;
width: 100%;
}
#wrapper {
position: absolute;
top: 10px;
left: 0;
right: 0;
bottom: 0;
}
canvas {
width: 100%;
height: 100%;
display: block;
}
</style>
<title>Snakes - A multiplayer game written in javascript using the HTML5 canvas, node.js, and Socket.IO</title>
<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-24953524-2']);
_gaq.push(['_setDomainName', 'eric-wieser.tk']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
</head>
<body>
<div id="wrapper"><canvas id="canvas">If you can see this, your browser sucks</canvas></div>
<div id="top">
<div id="message"></div>
<div class="score-bar">
<div></div>
<div></div>
<div></div>
<div></div>
</div>
</div>
<div id="bottom">
<ul id="scores"></ul>
<form id="chat">
<ul class="history">
</ul>
<input />
<button type="submit" style="display: none"></button>
</form>
</div>
<div id="login" class="vertical-center">
<div>
<div class="box">
<h1>Snakes</h2>
<p>Control the snake by moving the mouse - no clicking required. Eat other snakes, or be eaten. <a href="#" id="about-link">About</a>.</p>
<form id="join">
<button type="submit">Join the game</button>
<input id="name" placeholder="Enter your name here" autocomplete="off" autofocus="autofocus" />
</form>
<small>Type your name above, and press Enter to join the game</small>
</div>
</div>
</div>
<div id="about" class="vertical-center" style="display: none">
<div>
<div class="box">
<h1>About Snakes</h1>
<p>Snakes started off as a simple physics engine, with just balls bouncing off each other and the edges of the screen. Then a form of magnetic attraction was simulated. Interestingly, the balls naturally formed into wriggling snake shapes. A couple more tweaks, and a set of balls followed the player. It began to become apparent that there was a potential for a game here. Add a second player, a scoring system, and the ability to eat other balls, and you have a single computer, keyboard-mashing game. You can still play a <a href="/local">2 player</a>, <a href="/local?3">3 player</a>, or even <a href="/local?4">4 player</a> version of the single-computer version.</p>
<h2>Networking</h2>
<p>Snakes needed improving. The controls were terrible, the arena too small, and most keyboards couldn't cope with the strain of 4 users each hammering arrow keys. It needed to go networked. Node.js was the answer, along with Socket.IO. This was an exercise in learning new technologies, and seeing where they led to. </p>
<h2>Created by <a href="http://eric-wieser.tk/">Eric Wieser</a></h2>
<p>With thanks to Max Sinclair for allowing a core of his webserver to be devoted to Snakes, Luke Suess and Jonathan Laver for game inspiration along the way, and numerous friends for playing, testing, and hacking the game so that it could be improved.</p>
<p>The inspiration to go networked came from Rob Hawkes' <a href="http://rawkets.com">Rawkets</a></p>
<p>Browse the source code <a href="http://github.com/eric-wieser/snakes">on github</a>
</div>
</div>
</div>
<script>
var events = require('events');
require('./color');
require('./snake');
require('./world');
require('./ball');
require('./entity');
var colorId = Math.random();
var color = Color.niceColor(colorId);
$('.box').css({
borderTopColor: color.toString(),
borderBottomColor: color.toString(),
});
$('a').css({
borderBottomColor: color.toString(),
});
$('#login input, h2, a').css({
color: color.toString()
});
$('#about .box').click(function(e) {
e.stopPropagation();
});
//Show and hide the about box
$('#about-link').click(function() {
$('#login')
.fadeOut()
.queue(function(next) { $('#about').fadeIn(next); })
.queue(function(next) { $('#about').one('click', next); })
.queue(function(next) { $('#about').fadeOut(next); })
.fadeIn();
return false;
})
window.requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame || window.oRequestAnimationFrame || function(callback) {
window.setTimeout(function() {callback(Date.now())}, 1000 / 60.0);
};
//Get canvas stuff
var canvas = $('#canvas').get(0);
var width = canvas.width, height = canvas.height;
$(window).resize(function(){
width = canvas.width = $(canvas).width();
height = canvas.height = $(canvas).height();
}).resize();
// $(window).resize(function(){
// width = canvas.width = $(canvas).width();
// height = canvas.height = $(canvas).height();
// }).resize();
var ctx = canvas.getContext('2d');
var ball;
var opponents = {};
var keycodes = {
up: 87,
down: 83,
left: 65,
right: 68
};
var universe = new World(2000, 2000);
var socket = io.connect(':<%- port %>');
//var socket = io.connect('/');
var name;
var head;
var heads;
var viewOrigin = Vector.zero;
function nextViewOrigin() {
var x, y
if(!head) {
x = (universe.width - width) / 2;
y = (universe.height - height) / 2;
} else {
var border = 20;
x = head.position.x - width / 2;
y = head.position.y - height / 2;
if(x < -border)
x = -border;
else if(x > border + universe.width - width)
x = border + universe.width - width;
if(universe.width + 2 * border < width)
x = (universe.width - width) / 2;
if(y < -border)
y = -border;
else if(y > border + universe.height - height)
y = border + universe.height - height;
if(universe.height + 2 * border < height)
y = (universe.height - height) / 2;
}
return new Vector(x, y);
}
var nameinput = $('#name');
if(localStorage['name'])
nameinput.val(localStorage['name']);
var isTrying = false;
var playing = false;
$('#join').submit(function() {
//Stop things happening while the response is being waited for
if(!isTrying) {
isTrying = true;
n = nameinput.val();
socket.emit('join', {name: n, color: colorId}, function(data) {
if(data === true) {
localStorage['name'] = name = n;
$('#login').fadeOut(function() {
isTrying = false;
playing = true;
});
} else if(data instanceof Object && data.error) {
alert(data.error);
isTrying = false;
}
});
}
return false;
});
// socket.on('entityadded', function (data) {
// if(data.i in universe.entities) return;
// var b = new Ball(
// Vector.ify(data.p),
// data.r,
// Color.ify(data.c)
// );
// b._id = data.i; //probably going to regret this
// universe.addEntity(b);
// });
// socket.on('entitylost', function (id) {
// delete universe.entities[id];
// });
socket.on('servermessage', function (str) {
$('#message').html(str);
});
socket.on('ping', function() {
socket.emit('ping');
});
socket.on('scores', function (scores) {
//Get the DOM elements
var scoreList = $('#scores').empty();
var scoreBar = $('.score-bar').empty();
if(scores) {
//Keep track of left and rightmost bars
var mostLeft = 0;
var mostRight = 0;
scores.forEach(function(score, i) {
score = { name: score[0], value: score[1], color: score[2] };
//Add names to scoreboard
$('<li />').append(
$('<span class="name"/>').text(score.name), " ",
$('<span />').text(score.value)
).css('color', score.color).appendTo(scoreList);
//Pad out the bar, alternating sides
if(i%2 == 0) {
//left
$('<div />').css({
backgroundColor: score.color,
width: (score.value / 10) + '%',
left: (mostLeft / 10) + '%'
}).appendTo(scoreBar);
mostLeft += score.value;
}
else {
//right
$('<div />').css({
backgroundColor: score.color,
width: (score.value / 10) + '%',
right: (mostRight / 10) + '%'
}).appendTo(scoreBar);
mostRight += score.value;
}
});
}
});
socket.on('entityupdates', function (data) {
Object.forEach(data.e, function(edata, id) {
var p = Vector.ify(edata.p);
var c = Color.ify(edata.c);
var r = edata.r;
if(+id in universe.entities) {
var e = universe.entities[+id];
e.position = p;
e.color = c;
e.radius = r;
} else {
var b = new Ball(p, r, c);
b._id = +id;
universe.entities[+id] = b;
}
});
for(id in universe.entities)
if(!(id in data.e))
delete universe.entities[id];
var newHeads = {};
Object.forEach(data.s, function(id, name) {
newHeads[name] = universe.entities[id];
});
head = newHeads[name];
heads = newHeads;
if(playing) socket.emit('playercontrol', target.plus(viewOrigin));
});
var target = new Vector();
$(document).mousemove(function(e) {
var offset = $(canvas).offset();
target.set(e.pageX - offset.left, e.pageY - offset.top);
}).keydown(function() {
if(playing) $('#chat input').focus();
});
$('#chat').submit(function() {
if(playing) {
var input = $(this).find('input');
var msg = input.val();
input.val('');
socket.emit('chat', msg);
}
return false;
});
socket.on('chat', function (data) {
var name = data.n;
var color = Color.ify(data.c);
var message = data.m;
var history = $('#chat .history');
//alert(name + ":" + message);
$('<li />').text(' '+message).prepend(
$('<span />').css('color', color+"").text(name)
).appendTo('#chat .history');
while(history.children().size() > 10)
history.children().first().remove();
});
function drawArrow(x, y, angle) {
ctx.save();
ctx.translate(x, y);
ctx.rotate(angle);
ctx.beginPath();
ctx.moveTo(5, 0);
ctx.lineTo(20,-7.5);
ctx.lineTo(20, 7.5);
ctx.restore();
}
var lastt = Date.now();
function draw(t) {
//Calculate frame time
var dt = (t - lastt) / 1000.0;
ctx.clearRect(0, 0, width, height);
ctx.save();
viewOrigin = nextViewOrigin();
ctx.translate(-viewOrigin.x, -viewOrigin.y);
ctx.globalCompositeOperation = "source-over";
ctx.fillStyle = "black";
ctx.fillRect(0, 0, 2000, 2000);
ctx.globalCompositeOperation = "lighter";
universe.entities.forEach(function(e) {
e.drawTo(ctx);
});
Object.forEach(heads, function(h) {
var off = {
left: h.position.x + h.radius < viewOrigin.x,
right: h.position.x - h.radius > viewOrigin.x + width,
top: h.position.y + h.radius < viewOrigin.y,
bottom: h.position.y - h.radius > viewOrigin.y + height
}
off.any = off.right || off.left || off.top || off.bottom;
if(!off.any) {
ctx.beginPath();
ctx.arc(h.position.x, h.position.y, h.radius / 2, 0, Math.PI * 2, false);
ctx.fillStyle = "white";
ctx.fill();
}
else {
if(off.left && off.top)
drawArrow(viewOrigin.x, viewOrigin.y, Math.PI / 4);
else if(off.right && off.top)
drawArrow(viewOrigin.x + width, viewOrigin.y, 3*Math.PI / 4);
else if(off.left && off.bottom)
drawArrow(viewOrigin.x, viewOrigin.y + height, -Math.PI / 4);
else if(off.right && off.bottom)
drawArrow(viewOrigin.x + width, viewOrigin.y + height, -3*Math.PI / 4);
else if(off.left)
drawArrow(viewOrigin.x, h.position.y, 0);
else if(off.right)
drawArrow(viewOrigin.x + width, h.position.y, Math.PI);
else if(off.top)
drawArrow(h.position.x, viewOrigin.y, Math.PI / 2);
else if(off.bottom)
drawArrow(h.position.x, viewOrigin.y + height, -Math.PI / 2);
ctx.fillStyle = h.color+"";
ctx.fill();
}
});
//prepare for next frame
lastt = t;
ctx.restore();
requestAnimationFrame(draw);
}
requestAnimationFrame(draw);
</script>
</body>
</html>