Multi-user gravity beats for Sound of Science 2013 (website)
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172 lines
4.0 KiB

var myName;
var websocket;
var statusbar
var ballscreen;
var svgscreen;
var current_svgline;
var balls_online = new Array();
var svglines_online = new Array();
var speed = 100;
var line_kind = 1;
function init() {
myName = document.getElementById('loginname').value;
var login = document.getElementById('login');
login.parentNode.removeChild(login);
statusbar = document.getElementById('status');
ballscreen = document.getElementById("ballscreen");
svgscreen = document.getElementById("svgscreen");
statusbar.innerHTML = "connecting..."
if ("WebSocket" in window){
init_drawing(ballscreen, drawStart, drawMove, drawEnd, drawRemove);
websocket = 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>!';
}
return false;
}
function onOpen(evt) {
updateUser();
setInterval(poll, speed, true);
}
function onMessage(evt) {
var ret = JSON.parse(evt.data);
var balls = ret.balls;
var lines = ret.lines;
if(balls){
updateBalls(balls);
}
if(lines){
updateLines(lines);
}
}
function updateBalls(balls){
// Because we use transitions for the balls
// we really update them, and only delete the ones which are absent
var updates = 0;
var news = 0;
var removed = 0;
for(i in balls_online){
balls_online[i].should_remove = true;
}
for (var i = balls.length - 1; i >= 0; i--) {
var ball = document.getElementById(balls[i].information);
if(ball){
++updates;
ball.style.left = balls[i].position.x + "px";
ball.style.top = balls[i].position.y + "px";
ball.should_remove = false;
} else {
++news;
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){
++removed
ballscreen.removeChild(balls_online[i]);
balls_online.splice(i, 1);
}
};
statusbar.innerHTML = updates + ', ' + news + ', ' + removed;
}
function updateLines(lines){
// Simply delete and redraw them :)
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--) {
var current = addLine(lines[i], svgscreen);
if(lines[i].line_kind == 0){
current.setAttribute('class', "guitar");
} else {
current.setAttribute('class', "solid");
}
svglines_online.push(current);
};
}
function drawStart(line){
current_svgline = addLine(line, svgscreen);
if(line_kind == 0){
current_svgline.setAttribute('class', "guitar");
} else {
current_svgline.setAttribute('class', "solid");
}
}
function drawMove(line){
updateLine(current_svgline, line);
}
function drawEnd(line){
drawRemove(line);
line.line_kind = line_kind;
var packet = {
command: 'add line',
data: line
};
websocket.send(JSON.stringify(packet));
}
function drawRemove(line){
if(current_svgline){
svgscreen.removeChild(current_svgline);
current_svgline = null;
}
}
function updateUser() {
var myself = {
name: myName,
size: {width: window.innerWidth, height: window.innerHeight}
};
var packet = {
command: 'update user',
data: myself
};
websocket.send(JSON.stringify(packet));
}
function poll(){
var packet = {
command: 'poll'
};
websocket.send(JSON.stringify(packet));
}
function changeKind() {
line_kind = line_kind + 1;
line_kind = line_kind % 2;
var kind_str = "solid";
if(line_kind == 1) kind_str = "guitar"
document.getElementById("line_kind").innerHTML = kind_str;
}
setTimeout(function (){
window.scrollTo(0, 1);
}, 0);