Multi-user gravity beats for Sound of Science 2013 (website)
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<!DOCTYPE html>
<meta charset="utf-8" />
<head>
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="viewport" content="user-scalable=no, width=device-width" />
<title>WebSocket Test</title>
<style type="text/css">
body {
font-size: 16pt;
margin: 0px;
overflow: hidden;
height: 100%;
}
#ballscreen {
position: absolute;
background-color: rgba(0.0, 0.0, 0.0, 0.0);
width: 320px;
height: 480px;
border: 1px solid black;
}
.ball {
-webkit-transition: left 0.5s linear, top 0.5s linear;
position: absolute;
}
.ball .bullet {
width: 10px;
height: 10px;
position: absolute;
left: -5px;
top: -5px;
border-radius: 5px;
background-color: #f00;
}
#svgscreen {
background-color: #adf;
position: absolute;
width: 320px;
height: 480px;
}
#svgscreen line {
stroke: rgb(255,0,0);
stroke-width: 2;
}
</style>
<script type="text/javascript" src="connection.js"></script>
<script type="text/javascript" src="websocket.js"></script>
<script type="text/javascript" src="drawing.js"></script>
<script type="text/javascript" src="rendering.js"></script>
<script language="javascript" type="text/javascript">
var myName = Math.random().toString(36).substring(7);
var websocket;
var ballscreen;
var svgscreen;
var current_svgline;
var balls_online = new Array();
var svglines_online = new Array();
var speed = 100;
function init() {
var statusbar = document.getElementById('status');
ballscreen = document.getElementById("ballscreen");
document.getElementById("myName").innerHTML = myName;
svgscreen = document.getElementById("svgscreen");
if ("WebSocket" in window){
init_drawing(ballscreen, drawStart, drawMove, drawEnd, drawRemove);
init_websocket(statusbar, onOpen, onMessage);
} else {
statusbar.innerHTML = 'No websockets :(. This means that you either use <em>Internet Explorer</em> or <em>Android</em>. In both cases, I suggest that you use <a href="http://www.google.com/chrome/">Chrome</a> or <a href="http://www.getfirefox.net/">Firefox</a>!';
}
}
function onOpen(evt) {
doSend();
}
function onMessage(evt) {
var ret = JSON.parse(evt.data);
var people = ret.people;
var balls = ret.balls;
var lines = ret.lines;
for(ball in balls_online){
ball.should_remove = true;
}
for (var i = balls.length - 1; i >= 0; i--) {
var ball = document.getElementById(balls[i].information);
if(ball){
ball.style.left = balls[i].position.x + "px";
ball.style.top = balls[i].position.y + "px";
ball.should_remove = false;
} else {
var ball = document.createElement('div');
ball.should_remove = false;
ball.id = balls[i].information;
ball.className = 'ball';
ball.innerHTML = '<div class="bullet"></div>';
ball.style.left = balls[i].position.x + "px";
ball.style.top = balls[i].position.y + "px";
ballscreen.appendChild(ball);
balls_online.push(ball);
}
}
for (var i = balls_online.length - 1; i >= 0; i--) {
if(balls_online[i].should_remove){
ballscreen.removeChild(balls_online[i]);
balls_online.splice(i, 1);
}
};
for (var i = svglines_online.length - 1; i >= 0; i--) {
svgscreen.removeChild(svglines_online[i]);
};
svglines_online = new Array();
for (var i = lines.length - 1; i >= 0; i--) {
svglines_online.push(addLine(lines[i], svgscreen));
};
setTimeout(function(){
doSend();
}, speed);
}
function drawStart(line){
current_svgline = addLine(line, svgscreen);
}
function drawMove(line){
updateLine(current_svgline, line);
}
function drawEnd(line){
console.log(JSON.stringify(line));
drawRemove(line);
}
function drawRemove(line){
if(current_svgline){
svgscreen.removeChild(current_svgline);
current_svgline = null;
}
}
function doSend(message) {
var myself = {
name: myName,
size: {width: window.innerWidth, height: window.innerHeight}
};
websocket.send(JSON.stringify(myself));
}
window.addEventListener("load", init, false);
setTimeout(function (){
window.scrollTo(0, 1);
}, 0);
</script>
</head>
<body ontouchmove="prevent_scrolling(event);">
<p>My name is: <span id="myName"></span></p>
<p>Status: <span id="status">CONNECTING...</span></p>
<svg id="svgscreen" xmlns="http://www.w3.org/2000/svg" version="1.1"></svg>
<div id="ballscreen"></div>
</body>
</html>